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Assigning event handlers in JavaScript using DOM object property
 
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Link for all dot net and sql server video tutorial playlists http://www.youtube.com/user/kudvenkat/playlists Link for slides, code samples and text version of the video http://csharp-video-tutorials.blogspot.com/2015/01/assigning-event-handlers-in-javascript.html In JavaScript there are several ways to associate an event handler to the event. In Part 36, we discussed, associating event handler methods to events using the attributes of HTML tags. In this video we will discuss using DOM object property to assign event handlers to events. First let us understand, what is DOM DOM stands for Document Object Model. When a browser loads a web page, the browser creates a Document Object Model of that page. The HTML DOM is created as a tree of Objects. Example : [html] [head] [title]My Page Title[/title] [/head] [body] [script type="text/javascript"] [/script] [div] [h1]This is browser DOM[/h1] [/div] [/body] [/html] JavaScript can be used to access and modify these DOM objects and their properties. For example, you can add, modify and remove HTML elements and their attributes. Along the same lines, you can use DOM object properties to assign event handlers to events. We will discuss the DOM object in detail in a later video session. We will continue with the same examples that we worked with in Part 36. Notice that in this case, we are assigning event handlers using the DOM object properties (onmouseover & onmouseout) instead of using the attributes of the HTML tag. We are using this keyword to reference the current HTML element. In this example "this" references the button control. [input type="button" value="Click me" id="btn"/] [script type="text/javascript"] document.getElementById("btn").onmouseover = changeColorOnMouseOver; document.getElementById("btn").onmouseout = changeColorOnMouseOut; function changeColorOnMouseOver() { this.style.background = 'red'; this.style.color = 'yellow'; } function changeColorOnMouseOut() { this.style.background = 'black'; this.style.color = 'white'; } [/script] The following example is same as the above. In this case we are assigning an anonymous function to onmouseover & onmouseout properties. [input type="button" value="Click me" id="btn" /] [script type="text/javascript"] document.getElementById("btn").onmouseover = function () { this.style.background = 'red'; this.style.color = 'yellow'; } document.getElementById("btn").onmouseout = function () { this.style.background = 'black'; this.style.color = 'white'; } [/script] If an event handler is assigned using both, i.e an HTML attribute and DOM object property, the handler that is assigned using the DOM object property overwrites the one assigned using HTML attribute. Here is an example. [input type="button" value="Click me" id="btn" onclick="clickHandler1()"/] [script type="text/javascript"] document.getElementById("btn").onclick = clickHandler2; function clickHandler1() { alert("Handler set using HTML attribute"); } function clickHandler2() { alert("Handler set using DOM object property"); } [/script] Using this approach you can only assign one event handler method to a given event. The handler that is assigned last wins. In the following example, Handler2() is assigned after Handler1. So Handler2() owerites Handler1(). [input type="button" value="Click me" id="btn"/] [script type="text/javascript"] document.getElementById("btn").onclick = clickHandler1; document.getElementById("btn").onclick = clickHandler2; function clickHandler1() { alert("Handler 1"); } function clickHandler2() { alert("Handler 2"); } [/script]
Views: 48549 kudvenkat
Javascript Tutorial | Event Handlers in Javascript
 
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Events are listening out for interactivity by the user. It also could include a change in state; for example you could trigger an event if the HTML5 video player was playing, paused or in the stop position. This allows us to create interactive pages and show, hide or update content to notify the user. This is why it's so important to understand events. This tutorial is brought to you by http://www.avelx.co.uk/ - Coding tutorials to help you grow.
Views: 21922 Avelx
jQuery add event handler to dynamically created element
 
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Link for all dot net and sql server video tutorial playlists https://www.youtube.com/user/kudvenkat/playlists?sort=dd&view=1 Link for slides, code samples and text version of the video http://csharp-video-tutorials.blogspot.com/2015/04/jquery-add-event-handler-to-dynamically.html In this video we will discuss, how to add event handlers to dynamically created elements. Let us understand this with an example. The following example, allows us to dynamically create new list item (li), attach a click event handler and add it to the unordered list (ul). This happens when you click "Add a New List Item" button. The problem with this approach is that we are binding a click event handler to every list item. This means if you have 500 list items, then there will be 500 event handlers in the memory and this may negatively affect the performance of your application. <html> <head> <title></title> <script src="jquery-1.11.2.js"></script> <script type="text/javascript"> $(document).ready(function () { $('li').on('click', function () { $(this).fadeOut(500); }); $('#btnAdd').on('click', function () { var newListItem = $('<li>New List Item</li>').on('click', function () { $(this).fadeOut(500); }); $('ul').append(newListItem); }); }); </script> </head> <body style="font-family:Arial"> <input id="btnAdd" type="button" value="Add a New List Item" /> <ul> <li>List Item</li> <li>List Item</li> </ul> </body> </html> A better way of doing the same from a performance standpoint is shown below. In this example, the click event handler is attached to the listitem (li) parent element (ul). Even if you have 500 list items, there is only one click event handler in memory. So how does this work 1. When you click on a list item (li), the event gets bubbled up to its parent (ul) as the list item (li) does not have an event handler 2. The bubbled event is handled by the the parent (ul) element, as it has a click event handler. 3. When a new list item is added dynamicaly, you don't have to add the click event handler to it. Since the newly created list item (li) is added to the same parent element (ul), the click event of this list item also gets bubbled upto the same parent and will be handled by it. <html> <head> <title></title> <script src="jquery-1.11.2.js"></script> <script type="text/javascript"> $(document).ready(function () { $('ul').on('click', 'li', function () { $(this).fadeOut(500); }); $('#btnAdd').on('click', function () { $('ul').append('<li>New List Item</li>'); }); }); </script> </head> <body style="font-family:Arial"> <input id="btnAdd" type="button" value="Add a New List Item" /> <ul> <li>List Item</li> <li>List Item</li> </ul> </body> </html>
Views: 58515 kudvenkat
jQuery Basics: Click Event Handler
 
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Want more? Explore the library at https://www.codecourse.com/lessons Official site https://www.codecourse.com Twitter https://twitter.com/teamcodecourse
Views: 30381 Codecourse
Passing data to event handler in jQuery
 
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Link for all dot net and sql server video tutorial playlists https://www.youtube.com/user/kudvenkat/playlists?sort=dd&view=1 Link for slides, code samples and text version of the video http://csharp-video-tutorials.blogspot.com/2015/04/passing-data-to-event-handler-in-jquery.html In this video we will discuss how to pass data to the event handler function in jQuery The following example, 1. Binds the click event handler to the button using on function 2. We are passing 3 arguments to the on() function a) The name of the event b) JSON object that contains data that we want to pass to the event handler c) Event handler method name 3. In the event handler method (sayHello), we access the data using event object's data property. Replace < with LESSTHAN symbol and > with GREATERTHAN symbol <html> <head> <title></title> <script src="jquery-1.11.2.js"></script> <script type="text/javascript"> $(document).ready(function () { $('#btnClickMe').on('click', { firstName: 'John', lastName: 'Doe' }, sayHello); $('#btnClickMe').on('click', { firstName: 'Mary' }, sayHello); $('#btnClickMe').on('click', sayHello); function sayHello(event) { if (event.data == null) { alert('No name provided'); } else { alert('Hello ' + event.data.firstName + (event.data.lastName != null ? ' ' + event.data.lastName : '')); } } }); </script> </head> <body style="font-family:Arial"> <input id="btnClickMe" type="button" value="Click Me" /> </body> </html> Output : Hello John Doe Hello Mary No name provided
Views: 37111 kudvenkat
JavaScript Tutorial For Beginners #40 - The onClick Event
 
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Hey ninjas / ninjarettes, in this JavaScript tutorial I want to run through a detailed example of how we can use the onclick event in JavaScript to create cool functionality on our websites. In this example I'll use the onclick event to create a 'show more' style content box which expands and shrinks as you click the button. Any questions, fire away :). SUBSCRIBE TO CHANNEL - https://www.youtube.com/channel/UCW5YeuERMmlnqo4oq8vwUpg?sub_confirmation=1 ========== JavaScript for Beginners Playlist ========== https://www.youtube.com/playlist?list=PL4cUxeGkcC9i9Ae2D9Ee1RvylH38dKuET ========== CSS for Beginners Playlist ========== https://www.youtube.com/playlist?list=PL4cUxeGkcC9gQeDH6xYhmO-db2mhoTSrT ========== HTML for Beginners Playlist ========== https://www.youtube.com/playlist?list=PL4cUxeGkcC9ibZ2TSBaGGNrgh4ZgYE6Cc ========== The Net Ninja ============ For more front-end development tutorials & to black-belt your coding skills, head over to - https://www.youtube.com/channel/UCW5YeuERMmlnqo4oq8vwUpg or http://thenetninja.co.uk ========== Social Links ========== Twitter - @TheNetNinja - https://twitter.com/thenetninjauk
Views: 68772 The Net Ninja
Angular 2 for Beginners - Tutorial 9 - Click Event Handling
 
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Facebook - https://www.facebook.com/TheNewBoston-464114846956315/ GitHub - https://github.com/buckyroberts Google+ - https://plus.google.com/+BuckyRoberts LinkedIn - https://www.linkedin.com/in/buckyroberts reddit - https://www.reddit.com/r/thenewboston/ Support - https://www.patreon.com/thenewboston thenewboston - https://thenewboston.com/ Twitter - https://twitter.com/bucky_roberts
Views: 59365 thenewboston
Javascript Click Event Classic Style
 
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In This Video You will Learn ====================== JavaScript Click Event Classic Style About SEO skills ----------------------------------- www.seoskills.in is digital marketing and branding training academy located in Hyderabad, India. We train students, working employee’s and house wives digital marketing and branding tools. Website: https://www.seoskills.in Blog: https://www.alltechskills.com Facebook: https://www.facebook.com/DigitalVidyaHyd
Views: 2183 SEO Skills
003 JavaFX 8 GUI - Tolle Benutzeroberflächen bauen - EventHandler und Button Klick
 
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003 JavaFX 8 GUI - Tolle Benutzeroberflächen bauen - EventHandler und Button Klick In diesem Video geht es um unseren ersten Eventhandler, der es uns ermöglicht etwas auszuführen, wenn ein Button geklickt wurde. Diesen Button bauen wir auch gleich ein. Damit erhältst du zum ersten Mal ein interaktives Element in deiner GUI. Besuche die Webseite um mehr darüber zu erfahren. Link zum Kurs auf der Webseite findest du hier: https://panjutorials.de/courses/javafx-8-gui/ Link zum Artikel: https://panjutorials.de/tutorials/javafx-8-gui/9554-benutzerinteraktion-mit-dem-eventhandler-nutzen-in-javafx
Views: 2026 PanjuTorials
Understanding the jQuery Click Event
 
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The click event in jQuery is one of the most used events you could listen for. In this video, I show you the basics of the click event. Get the jQuery Selector Cheat Sheet here: https://prettyprinted.com/p/jquerycheatsheet Get the code here: https://prettyprinted.com/blog/1201737/understanding-jquery-click-event Web Development Courses: https://prettyprinted.com Subscribe: http://www.youtube.com/channel/UC-QDfvrRIDB6F0bIO4I4HkQ?sub_confirmation= Twitter: https://twitter.com/pretty_printed Facebook: https://www.facebook.com/prettyprintedtutorials/ Github: https://github.com/prettyprinted Instagram: https://www.instagram.com/pretty_printed Google Plus: https://plus.google.com/+PrettyPrintedTutorials
Views: 1614 Pretty Printed
SQL Server Integration Services (SSIS) Part 17 - Event-handling and logging
 
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If you'd like to help fund Wise Owl's conversion of tea and biscuits into quality training videos you can click this link https://www.wiseowl.co.uk/donate?t=1 to make a donation. Thanks for watching! By Andy Brown https://www.wiseowl.co.uk - This tutorial covers: - attaching events to different parts of a package (including when a variable's value changes) - logging what's happening in a package to a text file or to SQL Server - creating audit transforms to add additional columns in data flow If you like the style of our tutorials but think that there is no substitute for classroom training, we agree! Have a look at our two-day SSIS introductory course at http://www.wiseowl.co.uk/courses/ssis.htm (the course runs in the UK, and in warm countries by arrangement).
Views: 44591 WiseOwlTutorials
TabControl with customized TabItem and event handling
 
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In this WPF Tutorial we will learn: --How to design tab window in WPF. --How to use TabControl in WPF. --How to Add item in tab control. --How to customize Tab Item's Header content --How to get Tab Header's Content using code file --How to add content in TabItem.
Views: 8988 WPF
jQuery Tutorial 9: Event Handlers - Part 2
 
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Learn what are event method handlers in jQuery and how to make them work in your code!
Views: 1196 codedamn
Beginner JavaScript Tutorial - 22 - Event Handlers
 
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Facebook - https://www.facebook.com/TheNewBoston-464114846956315/ GitHub - https://github.com/buckyroberts Google+ - https://plus.google.com/+BuckyRoberts LinkedIn - https://www.linkedin.com/in/buckyroberts reddit - https://www.reddit.com/r/thenewboston/ Support - https://www.patreon.com/thenewboston thenewboston - https://thenewboston.com/ Twitter - https://twitter.com/bucky_roberts
Views: 304403 thenewboston
Handling Events for Multiple Elements
 
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Without bloating your code, learn how to rely on event propagation to easily and efficiently listen for events on many elements.
Views: 3592 Kirupa Chinnathambi
PyQt Tutorial-8-Event handler in a button
 
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This video shows you how to connect action to a pyqt button, or how to implement event handler to a QPushButton. There are some steps: 1. Create 2 QPushButton objects and move them to specific coordinator. 2. After clicking to each button, a variable will be increased and print out to the screen. SUBSCRIBE TO CHANNEL: https://www.youtube.com/c/NguyenDucHoang Twitter: https://twitter.com/NguyenD97601913 Facebook: https://www.facebook.com/nguyen.duc.hoang.bk
Views: 2290 Nguyen Duc Hoang
Handling events in AngularJS
 
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event handling in angularjs angularjs ng click example angularjs ng click event In this video we will discuss how to handle events in AngularJS. Let us understand with an example. Here is what we want to do. 1. Display the list of technologies in a table 2. Provide the ability to ike and dislike a technology 3. Increment the likes and dislikes when the respective buttons are clicked Script.js : In the controller function we have 2 methods to increment likes and dislikes. Both the functions have the technology object that we want to like or dislike as a parameter. var app = angular .module("myModule", []) .controller("myController", function ($scope) { var technologies = [ { name:"C#", likes:0, dislikes:0 }, { name: "ASP.NET", likes: 0, dislikes: 0 }, { name: "SQL", likes: 0, dislikes: 0 }, { name: "AngularJS", likes: 0, dislikes: 0 } ]; $scope.technologies = technologies; $scope.incrementLikes = function (technology) { technology.likes++; }; $scope.incrementDislikes = function (technology) { technology.dislikes++; }; }); HtmlPage1.html : Notice in the html below, we are associating incrementLikes() and incrementDislikes() functions with the respective button. When any of these buttons are clicked, the corresponsing technology object is automatically passed to the function, and the likes or dislikes property is incremented depending on which button is clicked. [!DOCTYPE html] [html xmlns="http://www.w3.org/1999/xhtml"] [head] [title][/title] [script src="Scripts/angular.min.js"][/script] [script src="Scripts/Script.js"][/script] [link href="Styles.css" rel="stylesheet" /] [/head] [body ng-app="myModule"] [div ng-controller="myController"] [table] [thead] [tr] [th]Name[/th] [th]Likes[/th] [th]Dislikes[/th] [th]Like/Dislike[/th] [/tr] [/thead] [tbody] [tr ng-repeat="technology in technologies"] [td] {{ technology.name }} [/td] [td style="text-align:center"] {{ technology.likes }} [/td] [td style="text-align:center"] {{ technology.dislikes }} [/td] [td] [input type="button" ng-click="incrementLikes(technology)" value="Like" /] [input type="button" ng-click="incrementDislikes(technology)" value="Dislike" /] [/td] [/tr] [/tbody] [/table] [/div] [/body] [/html] Styles.css : Styles for table, td and th elements table { border-collapse: collapse; font-family:Arial; } td { border: 1px solid black; padding: 5px; } th { border: 1px solid black; padding: 5px; text-align: left; } Link for all dot net and sql server video tutorial playlists https://www.youtube.com/user/kudvenkat/playlists?sort=dd&view=1 Link for slides, code samples and text version of the video http://csharp-video-tutorials.blogspot.com/2015/11/handling-events-in-angularjs.html
Views: 320569 kudvenkat
Events in JavaScript
 
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Link for all dot net and sql server video tutorial playlists http://www.youtube.com/user/kudvenkat/playlists Link for slides, code samples and text version of the video http://csharp-video-tutorials.blogspot.com/2015/01/events-in-javascript.html What is an event An event is a signal from the browser that something has happened. For example, 1. When a user clicks on an HTML element, click event occurs 2. When a user moves the mouse over an HTML element, mouseover event occurs When events occur, we can execute JavaScript code or functions in response to those events. To do this we need to associate JavaScript code or functions to the events. The function that executes in response to an event is called event handler. In JavaScript, there are several ways to associate an event handler to the event 1. Using the attributes of an HTML tag 2. Using DOM object property 3. Using special methods In this video we will discuss associating event handler methods to events using the attributes of HTML tags. In the following example, the code to execute in response to onmouseover & onmouseout events is set directly in the HTML markup. The keyword "this" references the current element. In this example "this" references the button control. [input type="button" value="Click me" id="btn" onmouseover="this.style.background= 'red'; this.style.color = 'yellow'" onmouseout="this.style.background= 'black'; this.style.color = 'white'" /] The above example, can be rewritten as shown below. In this case the code to execute in response to the event is placed inside a function and then the function is associated with the event. [input type="button" value="Click me" id="btn" onmouseover="changeColorOnMouseOver()" onmouseout="changeColorOnMouseOut()" /] [script type="text/javascript"] function changeColorOnMouseOver() { var control = document.getElementById("btn"); control.style.background = 'red'; control.style.color = 'yellow'; } function changeColorOnMouseOut() { var control = document.getElementById("btn"); control.style.background = 'black'; control.style.color = 'white'; } [/script] Events are very useful in real-world applications. For example they can be used to 1. Display confirmation dialog box on submitting a form 2. Form data validation and many more How to show confirmation dialog in JavaScript [input type="submit" value="Submit" id="btn" onclick="return confirmSubmit()" /] [script type="text/javascript"] function confirmSubmit() { if (confirm("Are you sure you want to submit")) { alert("You selected OK"); return true; } else { return false; confirm("You selected cancel"); } } [/script] JavaScript form validation example : In this example, both First Name and Last Name fields are required fields. When you type the first character in any of the textbox, the background colour is automatically changed to green. If you delete all the characters you typed or if you leave the textbox without entering any characters the background colour changes to red indicating the field is required. We made this possible using onkeyup and onblur events. onkeyup occurs when the user releases a key. onblur occurs when an element loses focus. [table] [tr] [td] First Name [/td] [td] [input type="text" id="txtFirstName" onkeyup="validateRequiredField('txtFirstName')" onblur="validateRequiredField('txtFirstName')"/] [/td] [/tr] [tr] [td] Last Name [/td] [td] [input type="text" id="txtLastName" onkeyup="validateRequiredField('txtLastName')" onblur="validateRequiredField('txtLastName')"/] [/td] [/tr] [/table] [script type="text/javascript"] function validateRequiredField(controlId) { var control = document.getElementById(controlId); control.style.color = 'white'; if (control.value == "") { control.style.background = 'red'; } else { control.style.background = 'green'; } } [/script]
Views: 65189 kudvenkat
Android - Event Handling
 
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Android - Event Handling Watch More Videos at https://www.tutorialspoint.com/videotutorials/index.htm Lecture By: Mr. Aditya Dua, Tutorials Point India Private Limited.
Event bubbling in JavaScript
 
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Link for all dot net and sql server video tutorial playlists http://www.youtube.com/user/kudvenkat/playlists Link for slides, code samples and text version of the video http://csharp-video-tutorials.blogspot.com/2015/01/event-bubbling-in-javascript.html What is event bubbling Let us understand this with an example. HTML elements can be nested inside each other. For example a button element can be nested inside a span element and the span element inturn can be nested inside a div element. Notice that we have onclick attribute specified for all the 3 elements. [html] [head] [style type="text/css"] .styleClass { display: table-cell; border: 1px solid black; padding: 20px; text-align: center; } [/style] [/head] [body] [div class="styleClass" onclick="alert('Div click handler')"]DIV element [span class="styleClass" onclick="alert('Span click handler')"]Span element [input type="button" value="Click me" onclick="alert('Button click handler')" /] [/span] [/div] [/body] [/html] A click on the button, causes a click event to be fired on the button. The button click event handler method handles the event. The click event then bubbles up to the button element parent (span element), which is handled by the span element event handler method. The click event then bubbles up to the span element parent (div element). This is called event bubbling. Notice that if you click on the [span] element, it's event handler and it's parent([div]) element event handler are called. If you click on the [div] element, just the [div] element event handler method is called. So, the event bubbling process starts with the element that triggered the event and then bubbles up to the containing elements in the hierarchy. The following example is similar to the one above, except we removed the onclick attribute from button and span elements. Because of event bubbling, when you click on the button or the span element, the event gets handled by the div element handler. [html] [head] [style type="text/css"] .styleClass { display: table-cell; border: 1px solid black; padding: 20px; text-align: center; } [/style] [/head] [body] [div class="styleClass" onclick="alert('Click event handled by DIV element')"]DIV element [span class="styleClass"]Span element [input type="button" value="Click me"/] [/span] [/div] [/body] [/html] When the event gets bubbled, the keyword this references the current element to which the event is bubbled. In the example below, we are using "this" keyword to reference the current div element and change it's border color. When you click on the innermost [div] element, all the 3 [div] elements border get changed due to event bubbling. [html] [head] [style type="text/css"] .divStyle { display: table-cell; border: 5px solid black; padding: 20px; text-align: center; } [/style] [/head] [body] [div id="DIV1" class="divStyle"] DIV 1 [div id="DIV2" class="divStyle"] DIV 2 [div id="DIV3" class="divStyle"] DIV 3 [/div] [/div] [/div] [script type="text/javascript"] var divElements = document.getElementsByTagName('div'); for (var i = 0; i [ divElements.length; i++) { divElements[i].onclick = function () { this.style.borderColor = "red"; alert(this.getAttribute("id") + " backgound changed"); } } [/script] [/body] [/html] Stopping event bubbling : If you don't want the event to be bubbled up, you can stop it. With Internet Explorer 8 and earlier versions event.cancelBubble = true With Internet Explorer 9 (and later versions) & all the other browsers event.stopPropagation()
Views: 50635 kudvenkat
REACT JS TUTORIAL #5 - Javascript Events & Data Changes in React
 
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Let's wrap up beginner React.js lessons with handling JS events and data changes in React.js. If you build a Reactjs app correctly, each component is able to be very "dumb"..it will only be aware of a few pieces of the application and can be reused in multiple places. If a component is only aware of the data it needs and the event(s) it needs to fire when things change, it can be extremely decoupled from the rest of the application and less prone to break as the React JS application changes over time. GET THE SOURCE CODE: https://github.com/learncodeacademy/react-js-tutorials React JS #1: Intro & Workspace Setup https://youtu.be/MhkGQAoc7bc (Coming Tues, Feb [email protected]) React JS #2: Anatomy of a Component https://youtu.be/fd2Cayhez58 (Coming Wed, Feb [email protected]) React JS #3: Composing Multiple Components https://youtu.be/vu_rIMPROoQ (Coming Thurs, Feb [email protected]) React JS #4: State, Props & Data https://youtu.be/qh3dYM6Keuw (Coming Fri, Feb [email protected]) React JS #5: Events & Data Changes https://youtu.be/_D1JGNidMr4 (Coming Mon, Feb [email protected]) React JS #6: React Router & Intro to Single Page Apps https://youtu.be/1iAG6h9ff5s (Coming Tues, Feb [email protected]) React JS #7: React Router Params & Queries https://youtu.be/ZBxMljq9GSE -~-~~-~~~-~~-~- Learning Web Development? Watch the FREE COURSE: "Web Development for Absolute Beginners"! https://www.youtube.com/watch?v=gQojMIhELvM -~-~~-~~~-~~-~-
Views: 255354 LearnCode.academy
Binding event handlers using jquery on method
 
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Link for all dot net and sql server video tutorial playlists https://www.youtube.com/user/kudvenkat/playlists?sort=dd&view=1 Link for slides, code samples and text version of the video http://csharp-video-tutorials.blogspot.com/2015/04/binding-event-handlers-using-jquery-on.html In this video we will discuss binding event handlers to events using on() method in jQuery In Part 33 of jQuery Tutorial, we discussed how to bind event handlers using bind() method. If you are using jQuery 1.7 or higher, you should be using on() and off() methods instead of bind() and unbind() methods. The syntax for using on() and off() methods is very similar to using bind() and unbind() methods. The following example is the same example we worked with in Part 33. Instead of using bind() and unbind() we are using on() and off() methods. Replace < with LESSTHAN symbol and > with GREATERTHAN symbol <html> <head> <title></title> <style> .ButtonStyle { background-color: red; cursor: pointer; font-weight: bold; color: white; } </style> <script src="jquery-1.11.2.js"></script> <script type="text/javascript"> $(document).ready(function () { $('#btnClickMe').on('click mouseover mouseout', function (event) { if (event.type == 'click') { $('#divResult').html('Button Clicked at ' + 'X = ' + event.pageX + ' Y = ' + event.pageY); } else if (event.type == 'mouseover') { $(this).addClass('ButtonStyle'); } else { $(this).removeClass('ButtonStyle'); } }); $('#btnEnableMouseOverEffect').click(function () { $('#btnClickMe').on('mouseover', function () { $(this).addClass('ButtonStyle'); }); }); $('#btnDisableMouseOverEffect').click(function () { $('#btnClickMe').off('mouseover'); }); }); </script> </head> <body style="font-family:Arial"> <input id="btnClickMe" type="button" value="Click Me" /> <input id="btnEnableMouseOverEffect" type="button" value="Enable Mouse Over Effect" /> <input id="btnDisableMouseOverEffect" type="button" value="Disable Mouse Over Effect" /> <br /><br /> <div id="divResult"></div> </body> </html> In the example above we are binding a single anonymous function as the event handler for all the 3 events 1. click 2. mouseover 3. mouseout If you want to bind a different anonymous function, you could do so using the following syntax. $('#btnClickMe').bind({ click : function(event){ $('#divResult').html('Button clicked at X = ' + event.pageX + ' Y = ' + event.pageY); }, mouseover: function () { $(this).addClass('ButtonStyle'); }, mouseout : function () { $(this).removeClass('ButtonStyle'); } }); jQuery shorthand functions (.click, .mouseover, .mouseout etc.) call on() method behind the scenes. So far in this video series we have seen 3 different ways of binding event handlers in jQuery 1. Using jQuery shorthand functions (.click, .mouseover, .mouseout etc.) element.click(function () { ... }); 2. With jQuery version < 1.7, bind() method can be used element.bind('click', function () { ... }); 3. With jQuery version 1.7 or higher, on() method can be used. element.on('click', function () { ... }); According to jQuery.com, as of jQuery 1.7, the .on() method is the preferred method for attaching event handlers.
Views: 33072 kudvenkat
jQuery event delegation
 
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Link for all dot net and sql server video tutorial playlists https://www.youtube.com/user/kudvenkat/playlists?sort=dd&view=1 Link for slides, code samples and text version of the video http://csharp-video-tutorials.blogspot.com/2015/05/jquery-event-delegation.html In this video we will discuss the concept of event delegation in jQuery. Event delegation allows us to attach a single event listener, to a parent element, that will fire for all descendants matching a selector, whether those descendants exist now or are added in the future. Both on() and delegate() functions allow us to perform event delegation. How does the following example work : 1. When you click on a list item (li), the event gets bubbled up to its parent (ul) as the list item (li) does not have it's own click event handler 2. The bubbled event is handled by the the parent (ul) element, as it has a click event handler. 3. When a new list item is added dynamicaly, you don't have to add the click event handler explicitly to it. Since the newly created list item (li) is added to the same parent element (ul), the click event of this list item also gets bubbled upto the same parent and will be handled by it. 4. undelegate() stops event delegation <html> <head> <title></title> <script src="jquery-1.11.2.js"></script> <script type="text/javascript"> $(document).ready(function () { $('ul').delegate('li', 'click', function () { $(this).fadeOut(500); }); $('#btnAdd').on('click', function () { $('ul').append('<li>New List Item</li>'); }); $('#btnUndelegate').on('click', function () { $('ul').undelegate('li', 'click'); }); }); </script> </head> <body style="font-family:Arial"> <input id="btnAdd" type="button" value="Add a New List Item" /> <input id="btnUndelegate" type="button" value="Undelegate" /> <ul> <li>List Item</li> <li>List Item</li> </ul> </body> </html> If you are using jQuery 1.7 or higher version, jQuery recommends to use on() to perform event delegation instead of delegate(). The above example can be very easily rewritten using on() and off() functions, instead of delegate() and undelegate() functions as shown below. We discussed performing event delegation using on() function in detail in Part 36 of jQuery tutorial. <html> <head> <title></title> <script src="jquery-1.11.2.js"></script> <script type="text/javascript"> $(document).ready(function () { $('ul').on('click', 'li', function () { $(this).fadeOut(500); }); $('#btnAdd').on('click', function () { $('ul').append('<li>New List Item</li>'); }); $('#btnUndelegate').on('click', function () { $('ul').off('click', 'li'); }); }); </script> </head> <body style="font-family:Arial"> <input id="btnAdd" type="button" value="Add a New List Item" /> <input id="btnUndelegate" type="button" value="Undelegate" /> <ul> <li>List Item</li> <li>List Item</li> </ul> </body> </html>
Views: 34809 kudvenkat
How to Remove Table Row tr in jQuery on Button Click in Tamil
 
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Click Event in JQuery dblClick Event in JQuery Mouse Events in JQuery Hover Event in JQuery FadeIn Event in Jquery FadeOut Event in Jquery FadeToggle Effect in Jquery FadeTo Effect in Jquery Animate Effect in Jquery Animate Using Relative Values in Jquery Animate Using Continuous Values in Jquery Callback Function in Jquery Without Callback Function in Jquery How to Use Chaining in Jquery Get Methods in Jquery Set Methods in Jquery Append Method in Jquery Selectors in Jquery Filters in Jquery Hierarchy Filters in Jquery Filter Using Attributes in Jquery Use Traversing Methods in Jquery Use Before and After Methods in Jquery Use Remove Method in Jquery Use Empty Method in Jquery Remove Classes Using Jquery Add Classes Using Jquery Toggle Between Classes in Jquery Using selectors and filters to extract information Creating, inserting, and manipulating webpage content Understanding jQuery statement chaining Using CSS to position content Building event handlers Showing, hiding, and fading page elements with jQuery Creating custom animations Accessing external data with AJAX jQuery is a JavaScript Library. jQuery greatly simplifies JavaScript programming. jQuery is easy to learn in Tamil Complete Jquery in Tamil Tutor Joes Jquery Tamil Tutorial google image search style gallery jquery google images effect google image search style gallery google image likeness search Using selectors and filters to extract information Creating, inserting, and manipulating webpage content Understanding jQuery statement chaining Using CSS to position content Building event handlers Showing, hiding, and fading page elements with jQuery Creating custom animations Accessing external data with AJAX jQuery is a JavaScript Library. jQuery greatly simplifies JavaScript programming. jQuery is easy to learn in Tamil Complete Jquery in Tamil Tutor Joes Jquery Tamil Tutorial google image search style gallery jquery google images effect google image search style gallery google image likeness search How to Remove Table Row tr in jQuery on Button Click in Tamil How to Add Table Row tr in jQuery on Button Click In Tamil How To Read The Value Of HTML Table by Jquery in Tamil Check for file extension before uploading By Jquery In Tamil How to Get Selected Radio Button Value in jQuery In Tamil For Free source code and Free Project Please visit : http://www.tutorjoes.com/ http://www.facebook.com/tutorjoes http://www.youtube.com/tutorjoes
Views: 1825 Tutor-Joes Stanley
WPF - Attach single click event handler with multiple buttons
 
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This demonstration shows that how a single event handler can be used for multiple controls instead of having separate event handler for each control. Invoker of the event handler can be identified easily and generic code can be written for the solution.
UI Events and Event Triggers - Unity Official Tutorials
 
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Watch on the official Unity learn pages here - In Unity 4.6 we add the new Event System to trigger things in code from your UI. This tutorial is a quick overview of the system and how it works. Help us caption & translate this video! http://amara.org/v/V67C/
Views: 85820 Unity
Javascript Events Tutorial - How Web Developers Respond to User Input
 
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Simple Javascript Events Tutorial with code! Almost every Web Developer finds themselves needing to respond to user actions on a page by changing content or adjusting the page display somehow. The way you do that is by listening to Javascript events. VIEW THE CODE: - addition: http://codepen.io/anon/pen/vOeeqG?editors=101 - pic link: http://codepen.io/anon/pen/vxYxKN?editors=101 Popular Javascript Events Are: - click - mouseenter - mouseleave - mousedown - mouseup - mousemove - keydown - keyup - blur - focus See list of all javascript events here: https://developer.mozilla.org/en-US/docs/Web/Events In this lesson, we'll add event listeners to html elements. When the users click, focus, blur, press a key, or move their mouse, javascript will get notified and we can make the webpage change. Listening to Javascript events is a bread and butter task for web development and web developers. -~-~~-~~~-~~-~- Learning Web Development? Watch the FREE COURSE: "Web Development for Absolute Beginners"! https://www.youtube.com/watch?v=gQojMIhELvM -~-~~-~~~-~~-~-
Views: 206785 LearnCode.academy
Angular 6 Basics 17 - Handling click events
 
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Access the full course here: https://javabrains.io/courses/angular_basics We'll now implement some interactivity by adding a button and having its click event trigger showing and hiding of a div. You'll learn how to wire in member methods to be executed on user events and how you can affect component state with them. Angular 6 Basics - Learn how to create Angular applications from scratch. Understand the Angular framework and learn how to use the features of the framework to create components and services. Use modules to organize your code. Build applications that call REST APIs and fetch data from a server. Implement routing to show multiple views with multiple URLs. This course requires no previous knowledge of Angular or AngularJS.
Views: 13198 Java Brains
JavaScript Tutorial For Beginners #36 - Changing CSS Styles
 
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Hey ninjas, in this JavaScript tutorial, we'll be looking again at the setAttribute method to control in-line styling of our HTML elements, as well as utilizing the 'style' property that all DOM objects have access to. If you have any questions at all, fire away :). SUBSCRIBE TO CHANNEL - https://www.youtube.com/channel/UCW5YeuERMmlnqo4oq8vwUpg?sub_confirmation=1 ========== JavaScript for Beginners Playlist ========== https://www.youtube.com/playlist?list=PL4cUxeGkcC9i9Ae2D9Ee1RvylH38dKuET ========== CSS for Beginners Playlist ========== https://www.youtube.com/playlist?list=PL4cUxeGkcC9gQeDH6xYhmO-db2mhoTSrT ========== HTML for Beginners Playlist ========== https://www.youtube.com/playlist?list=PL4cUxeGkcC9ibZ2TSBaGGNrgh4ZgYE6Cc ========== The Net Ninja ============ For more front-end development tutorials & to black-belt your coding skills, head over to - https://www.youtube.com/channel/UCW5YeuERMmlnqo4oq8vwUpg or http://thenetninja.co.uk ========== Social Links ========== Twitter - @TheNetNinja - https://twitter.com/thenetninjauk
Views: 25459 The Net Ninja
addeventlistener and removeeventlistener in JavaScript
 
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Link for all dot net and sql server video tutorial playlists http://www.youtube.com/user/kudvenkat/playlists Link for slides, code samples and text version of the video http://csharp-video-tutorials.blogspot.com/2015/01/addeventlistener-and.html In this video we will discuss assigning event handlers in JavaScript using the following special methods addEventListener removeEventListener attachEvent detachEvent Internet Explorer 9 (and later versions) & all the other modern browsers support addEventListener() and removeEventListener() methods. Sytnax for assigning event handler using addEventListener() method element.addEventListener(event, handler, phase) Sytnax for removing event handler using removeEventListener() method element.removeEventListener(event, handler, phase) Please note : The third parameter phase is usually set to false as it is not used. Example : In this example, we are passing values for all the 3 parameters including phase. [input type="button" value="Click me" id="btn"/] [script type="text/javascript"] btn.addEventListener("mouseover", changeColorOnMouseOver, false); btn.addEventListener("mouseout", changeColorOnMouseOut, false); function changeColorOnMouseOver() { this.style.background = 'red'; this.style.color = 'yellow'; } function changeColorOnMouseOut() { this.style.background = 'black'; this.style.color = 'white'; } [/script] Since the third parameter "phase" is optional you can omit it if you wish. btn.addEventListener("mouseover", changeColorOnMouseOver); btn.addEventListener("mouseout", changeColorOnMouseOut); Example : This example demonstrates removing event handlers. [input type="button" value="Click me" id="btn"/] [input type="button" value="Remove Event Handlers" onclick="removeEventHandlers()" /] [script type="text/javascript"] btn.addEventListener("mouseover", changeColorOnMouseOver); btn.addEventListener("mouseout", changeColorOnMouseOut); function changeColorOnMouseOver() { this.style.background = 'red'; this.style.color = 'yellow'; } function changeColorOnMouseOut() { this.style.background = 'black'; this.style.color = 'white'; } function removeEventHandlers() { btn.removeEventListener("mouseover", changeColorOnMouseOver); btn.removeEventListener("mouseout", changeColorOnMouseOut); } [/script] Using this approach you can assign more than one event handler method to a given event. The order in which handler methods are executed is not defined. In this example, 2 event handler methods (clickHandler1 & clickHandler3) are assigned to click event of the button control. When you click the button both the handler methods are executed. [input type="button" value="Click me" id="btn"/] [script type="text/javascript"] btn.addEventListener("click", clickHandler1); btn.addEventListener("click", clickHandler2); function clickHandler1() { alert("Handler 1"); } function clickHandler2() { alert("Handler 2"); } [/script] attachEvent() and detachEvent() methods only work in Internet Explorer 8 and earlier versions. Sytnax for assigning event handler using attachEvent() method element.attachEvent( "on"+event, handler) Sytnax for removing event handler using detachEvent() method element.detachEvent( "on"+event, handler) Example : This example will only work in Internet Explorer 8 and earlier versions. [input type="button" value="Click me" id="btn"/] [script type="text/javascript"] btn.attachEvent("onclick", clickEventHandler); function clickEventHandler() { alert("Click Handler"); } [/script] Cross browser solution : For the above example to work in all browsers, modify the script as shown below. [input type="button" value="Click me" id="btn"/] [script type="text/javascript"] if (btn.addEventListener) { btn.addEventListener("click", clickEventHandler); } else { btn.attachEvent("onclick", clickEventHandler); } function clickEventHandler() { alert("Click Handler"); } [/script]
Views: 40618 kudvenkat
addEventListener() - Beau teaches JavaScript
 
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The addEventListener() method attaches an event handler to the specified element without overwriting existing event handlers so you can add many event handlers to one element. You can use removeEventListener() to remove an event. 💻 Code: https://codepen.io/beaucarnes/pen/JNRKXX?editors=1010 🔗 All DOM events: https://developer.mozilla.org/en-US/docs/Web/Events 🐦 Beau Carnes on Twitter: https://twitter.com/carnesbeau ⭐JavaScript Tutorials Playlists⭐ ▶JavaScript Basics: https://www.youtube.com/playlist?list=PLWKjhJtqVAbk2qRZtWSzCIN38JC_NdhW5 ▶Data Structures and Algorithms: https://www.youtube.com/playlist?list=PLWKjhJtqVAbkso-IbgiiP48n-O-JQA9PJ ▶Design Patterns: https://www.youtube.com/playlist?list=PLWKjhJtqVAbnZtkAI3BqcYxKnfWn_C704 ▶ES6: https://www.youtube.com/playlist?list=PLWKjhJtqVAbljtmmeS0c-CEl2LdE-eR_F ▶Clean Code: https://www.youtube.com/playlist?list=PLWKjhJtqVAbkK24EaPurzMq0-kw5U9pJh - We're busy people who learn to code, then practice by building projects for nonprofits. Learn Full-stack JavaScript, build a portfolio, and get great references with our open source community. Join our community at https://freecodecamp.com Read great tech articles at https://medium.freecodecamp.com
Views: 15969 freeCodeCamp.org
jQuery scroll event
 
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Link for all dot net and sql server video tutorial playlists https://www.youtube.com/user/kudvenkat/playlists?sort=dd&view=1 Link for slides, code samples and text version of the video http://csharp-video-tutorials.blogspot.com/2015/05/jquery-scroll-event.html In this video we will discuss scroll event and how to handle it using jQuery. scroll event is raised when the user scrolls to a different place in the element. It applies to window objects, but also to scrollable frames and elements with the overflow CSS property set to scroll. In the following exampe, notice that the div element overflow style is set to scroll. The div element has a scrollbar and as you scroll up and down the div element, the scroll event is raised and handled. Replace < with LESSTHAN symbol and > with GREATERTHAN symbol <html> <head> <title></title> <script src="jquery-1.11.2.js"></script> <script type="text/javascript"> $(document).ready(function () { $('div').scroll(function () { $('h3').css('display', 'inline').fadeOut(1000); }); }); </script> </head> <body style="font-family:Arial"> <div style="width:300px; height:200px; border:1px solid black; overflow:scroll"> PRAGIM Speciality in training arena unlike other training institutions. Training delivered by real time software experts having more than 10 years of experience. Interview questions and real time scenarios discussion on topics covered for the day. Realtime projects discussion relating to the possible interview questions. Trainees can attend training and use lab untill you get a job. Resume preperation and mock up interviews. 100% placement assistance. 24 hours lab facility. PRAGIM Technologies offers professional real time projects for studetns in their final semester. Course completion and project completion certificates will also be provided upon successful completion of the course. We have partnered with major multinational companies to place freshers with our clients on their course completion. </div> <br /> <h3 style="display:none; color:red">Scroll event handled</h3> </body> </html> The following example, keeps track of how many times the scroll event is raised. <html> <head> <title></title> <script src="jquery-1.11.2.js"></script> <script type="text/javascript"> $(document).ready(function () { var count = 0; $('div').scroll(function () { $('span').text(count += 1); }); }); </script> </head> <body style="font-family:Arial"> <div style="width:300px; height:200px; border:1px solid black; overflow:scroll"> DIV CONTENT </div> <br /> <h3 style="color:red">Scroll event handled <span>0</span> time(s)</h3> </body> </html> The following example, keeps track of whether the user scrolled up or down. <html> <head> <script src="jquery-1.11.2.js"></script> <script type="text/javascript"> $(document).ready(function () { var lastScrollTop = 0; $('div').scroll(function () { var currentScrollPosition = $(this).scrollTop(); if (currentScrollPosition > lastScrollTop) { $('h3').text('You scrolled down'); } else { $('h3').text('You scrolled up'); } lastScrollTop = currentScrollPosition; }); }); </script> </head> <body style="font-family:Arial"> <div style="width:300px; height:200px; border:1px solid black; overflow:scroll"> DIV CONTENT </div> <br /> <h3 style="display:inline; color:red"></h3> </body> </html>
Views: 47133 kudvenkat
Javascript tutorial addEventListener Best HTML Event Handling W3C Recommended Method
 
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Lesson Code: http://www.developphp.com/view.php?tid=1208 Learn how to use the Javascript addEventListener() method for an optimal way of adding user interactivity into your HTML4 and HTML5 websites and web applications that apply Javascript.
Views: 54575 Adam Khoury
Angular 7 Tutorial - 9 - Event Binding
 
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Support - https://www.paypal.me/Codevolution Facebook - https://www.facebook.com/codevolutionweb Github - https://github.com/gopinav Angular | Angular Tutorial for Beginners | Angular Event Binding
Views: 68968 Codevolution
Let's Show #83 - Python Tutorial - Graph Plot Style | pyqtgraph | numpy | PyQt
 
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Python PyQt Graph numpy Tutorial: Plot Graph Style. ↕↕↕↕↕↕↕↕↕↕↕↕↕↕Links↕↕↕↕↕↕↕↕↕↕↕↕↕↕ Amazon-Link: http://amzn.to/1yr6OdD Günstige Spiele: https://www.g2a.com/r/sawmyname Meine Buchempfehlungen: C#: http://amzn.to/1sW4Mdb Python: http://amzn.to/Zc3T9g CSS: http://amzn.to/1uhO4uy JavaScript: http://amzn.to/1mJNy6n Java: http://amzn.to/1pbGv1z Facebook: https://www.facebook.com/pages/Event-Handler/1495860210672727 Pyqtgraph: http://pyqtgraph.org numpy: http://www.lfd.uci.edu/~gohlke/pythonlibs/#numpy scipy: http://www.lfd.uci.edu/~gohlke/pythonlibs/#scipy PyQt: http://www.lfd.uci.edu/~gohlke/pythonlibs/#pyqt
Views: 1731 Event Handler
QuickTip #158 - CSS Tutorial - Word Spacing | HTML | style
 
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CSS HTML Tutorial: Word Spacing. |||||||||||||||||Links||||||||||||||||| Amazon-Link: http://amzn.to/1yr6OdD Günstige Spiele: https://www.g2a.com/r/sawmyname Meine Buchempfehlungen: C#: http://amzn.to/1sW4Mdb Python: http://amzn.to/Zc3T9g CSS: http://amzn.to/1uhO4uy JavaScript: http://amzn.to/1mJNy6n Java: http://amzn.to/1pbGv1z Facebook: https://www.facebook.com/pages/Event-Handler/1495860210672727
Views: 38 Event Handler
jQuery event object
 
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Link for all dot net and sql server video tutorial playlists https://www.youtube.com/user/kudvenkat/playlists?sort=dd&view=1 Link for slides, code samples and text version of the video http://csharp-video-tutorials.blogspot.com/2015/04/jquery-event-object.html In this video we will discuss 1. How to retrieve event data using event object 2. How to convert JavaScript event object to jQuery event object Whenever an event (like click, mouseover, mouseout etc) occurs, the relevant data about that event is placed into the event object. For example, the event object contains event data like, the X and Y coordinates of the mouse pointer when the event occurred, the HTML element that fired the event, which mouse button is clicked etc. Obtaining the event object is straightforward. The event object is always passed to the event handler method. Let us understand this with an example. When we click the button, we want to capture the following event data 1. Event name 2. Mouse X coordinate when the event occured 3. Mouse Y coordinate when the event occured 4. The control that raised the event 5. The HTML tag name that raised the event Notice that in the example below, we are passing event object to getEventDetails() method. This object is the raw JavaScript event object. The type property gives us the event name that occured. pageX and pageY properties return the X and Y coordinates of the mouse pointer. Target property returns the HTML element that raised the event. Target, pageX and pageY properties are supported by all modern browsers and Internet Explorer 9 and above. The following code will not work in Internet Explorer 8 and earlier versions. In addition to click event, the following example returns mouseover and mouseout event data. Replace < with LESSTHAN symbol and > with GREATERTHAN symbol <html> <head> <title></title> <script src="jquery-1.11.2.js"></script> <script type="text/javascript"> $(document).ready(function () { $('#btn').click(function () { getEventDetails(event); }).mouseover(function () { getEventDetails(event); }).mouseout(function () { getEventDetails(event); }); function getEventDetails(event) { var eventDetails = "Event = " + event.type + "<br/> X = " + event.pageX + "<br/>Y = " + event.pageY + "<br/>Target Type = " + event.target.type + "<br/>Target Tag Name = " + event.target.tagName; $('#divResult').html(eventDetails); } }); </script> </head> <body style="font-family:Arial"> <input id="btn" type="button" value="Click me" /><br /><br /> <div id="divResult"></div> </body> </html> Cross-browser solution : For the above code to work in all browsers including Internet Explorer 8 and earlier versions, modify getEventDetails() function as shown below. Notice that we are converting JavaScript event object to jQuery event object using $.event.fix() function getEventDetails(event) { var e = $.event.fix(event); var eventDetails = "Event = " + e.type + "<br/> X = " + e.pageX + "<br/>Y = " + e.pageY + "<br/>Target Type = " + e.target.type + "<br/>Target Tag Name = " + e.target.tagName; $('#divResult').html(eventDetails); }
Views: 36991 kudvenkat
JAVA SCRIPT PART 32 Event Handlers
 
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JAVA SCRIPT Event Handlers
Views: 77 TECH Studio
Javascript Tutorial - 24 - Event Handlers Introduction
 
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Facebook - https://www.facebook.com/TheNewBoston-464114846956315/ GitHub - https://github.com/buckyroberts Google+ - https://plus.google.com/+BuckyRoberts LinkedIn - https://www.linkedin.com/in/buckyroberts reddit - https://www.reddit.com/r/thenewboston/ Support - https://www.patreon.com/thenewboston thenewboston - https://thenewboston.com/ Twitter - https://twitter.com/bucky_roberts
Views: 43305 thenewboston
JavaFx Tutorial For Beginners 4 - How to Use Lambda Expressions to Handle Events
 
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In this JavaFx Tutorial For Beginners video I will How to Use Lambda Expressions to Handle Events. This video will cover JavaFX 8 Event Handling Examples, Using Lambda Expressions of Java 8 in Java FX Lambda expressions don't work in Java 8, Implement event handler using Lambda Expression, Java programming with lambda expressions. -------------------Online Courses to learn---------------------------- Java - https://bit.ly/2H6wqXk C++ - https://bit.ly/2q8VWl1 AngularJS - https://bit.ly/2qebsLu Python - https://bit.ly/2Eq0VSt C- https://bit.ly/2HfZ6L8 Android - https://bit.ly/2qaRSAS Linux - https://bit.ly/2IwOuqz AWS Certified Solutions Architect - https://bit.ly/2JrGoAF Modern React with Redux - https://bit.ly/2H6wDtA MySQL - https://bit.ly/2qcF63Z ----------------------Follow--------------------------------------------- My Website - http://www.codebind.com My Blog - https://goo.gl/Nd2pFn My Facebook Page - https://goo.gl/eLp2cQ Google+ - https://goo.gl/lvC5FX Twitter - https://twitter.com/ProgrammingKnow Pinterest - https://goo.gl/kCInUp Text Case Converter - https://goo.gl/pVpcwL -------------------------Stuff I use to make videos ------------------- Stuff I use to make videos Windows notebook – http://amzn.to/2zcXPyF Apple MacBook Pro – http://amzn.to/2BTJBZ7 Ubuntu notebook - https://amzn.to/2GE4giY Desktop - http://amzn.to/2zct252 Microphone – http://amzn.to/2zcYbW1 notebook mouse – http://amzn.to/2BVs4Q3 ------------------Facebook Links ---------------------------------------- http://fb.me/ProgrammingKnowledgeLearning/ http://fb.me/AndroidTutorialsForBeginners http://fb.me/Programmingknowledge http://fb.me/CppProgrammingLanguage http://fb.me/JavaTutorialsAndCode http://fb.me/SQLiteTutorial http://fb.me/UbuntuLinuxTutorials http://fb.me/EasyOnlineConverter
Views: 81654 ProgrammingKnowledge
JavaScript event capturing
 
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Link for all dot net and sql server video tutorial playlists http://www.youtube.com/user/kudvenkat/playlists Link for slides, code samples and text version of the video http://csharp-video-tutorials.blogspot.com/2015/01/javascript-event-capturing.html Event capturing is the opposite of event bubbling. We discussed event bubbling in detail in Part 40 of JavaScript tutorial. With event bubbling the event bubbles up from the inner most element to the outer most element in the DOM hierarchy. With event capuring the opposite happens, the event gets captured from the outer most element to innermost element. In real world event capturing is rarely used. Let us understand this with an example. In the following example we have 3 [div] nested elements. Notice that we are using addEventListener() method to assign event handler to each [div] element. To enable event capturing we have set the third parameter (phase) of addEventListener() method to true. Now when you click on the innermost [div] (DIV3), notice that the events are fired from the outermost [div] to innermost [div] (DIV1 =] DIV 2 =] DIV 3). [html] [head] [style type="text/css"] .divStyle { display: table-cell; border: 5px solid black; padding: 20px; text-align: center; } [/style] [/head] [body] [div id="DIV1" class="divStyle"] DIV 1 [div id="DIV2" class="divStyle"] DIV 2 [div id="DIV3" class="divStyle"] DIV 3 [/div] [/div] [/div] [script type="text/javascript"] var divElements = document.getElementsByTagName('div'); for (var i = 0; i [ divElements.length; i++) { divElements[i].addEventListener("click", clickHandler, true); } function clickHandler() { alert(this.getAttribute("id") + " click event handled"); } [/script] [/body] [/html] Please note : IE8 and earlier versions does not support addEventListener() method. This implies that event capturing is not supported in IE8 and earlier versions, and hence the above code will not work in IE 8 and earlier versions. Stopping event capturing : Stopping event capturing is very similar to stopping event bubbling. With the example below, when you click on any [div] element notice that DIV 1 element handles the click event and it does not get captured down. [html] [head] [style type="text/css"] .divStyle { display: table-cell; border: 5px solid black; padding: 20px; text-align: center; } [/style] [/head] [body] [div id="DIV1" class="divStyle"] DIV 1 [div id="DIV2" class="divStyle"] DIV 2 [div id="DIV3" class="divStyle"] DIV 3 [/div] [/div] [/div] [script type="text/javascript"] var divElements = document.getElementsByTagName('div'); for (var i = 0; i [ divElements.length; i++) { divElements[i].addEventListener("click", clickHandler, true); } function clickHandler(event) { event.stopPropagation(); alert(this.getAttribute("id") + " click event handled"); } [/script] [/body] [/html] Using addEventListener() method with last argument set to true is the only way to enable event capturing. If the thid parameter (phase) is set to true event capturing is enabled and if it is set to false event bubbling is enabled. If you want both even bubbling and capturing to be enabled, then assign handlers 2 times, once with the phase parameter set to false and once with the phase parameter set to true as shown below. [html] [head] [style type="text/css"] .divStyle { display: table-cell; border: 5px solid black; padding: 20px; text-align: center; } [/style] [/head] [body] [div id="DIV1" class="divStyle"] DIV 1 [div id="DIV2" class="divStyle"] DIV 2 [div id="DIV3" class="divStyle"] DIV 3 [/div] [/div] [/div] [script type="text/javascript"] var divElements = document.getElementsByTagName('div'); for (var i = 0; i [ divElements.length; i++) { divElements[i].addEventListener("click", clickHandler, false); divElements[i].addEventListener("click", clickHandler, true); } function clickHandler() { alert(this.getAttribute("id") + " click event handled"); } [/script] [/body] [/html] With both event capturing and bubbling enabled, events are first captured from the outermost element to the innermost element and then bubbles up from the innermost to the outermost element.
Views: 34860 kudvenkat
How to attach an event to a handler in Python | Pluralsight
 
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Python Desktop Application Development | http://www.pluralsight.com/courses/python-desktop-application-development In this video excerpt, developer Bo Milanovich, uses Python to attach an event handler and tests it. This course demonstrates how you can easily create desktop applications using the simplicity of Python and the power of Qt. Visit us at: Facebook: https://www.facebook.com/pluralsight Twitter: https://twitter.com/pluralsight Google+: https://plus.google.com/+pluralsight LinkedIn: https://www.linkedin.com/company/pluralsight Instagram: http://instagram.com/pluralsight Blog: http://blog.pluralsight.com/ 3,500 courses unlimited and online. Start your 10-day FREE trial now: https://www.pluralsight.com/a/subscribe/step1?isTrial=True Python Desktop Application | Pluralsight -~-~~-~~~-~~-~- Push your limits. Expand your potential. Smarter than yesterday- https://www.youtube.com/watch?v=k2s77i9zTek -~-~~-~~~-~~-~-
Views: 3397 Pluralsight
jQuery Tutorial - Using Mouse Events and Event Handlers
 
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A tutorial giving an introduction to the theory and practice behind events in jQuery, including the demonstration of a click event (with code). Also explained are how to use id selectors, as well as a brief explanation of other core scripting ideas such as event handlers and function calls.
Views: 1818 heaveninteractive
angular2  for beginners: Component, Template Binding, Event Handler
 
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Best architecture of Angular2 application. How to . use angular-cli create component
Views: 1360 That JS Dude
EVENT MEDIA  & LIFE  STYLE  STUDIO CHHINDWARA 9977111188,9300777001
 
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Views: 406 LIFE STYLE MEDIA
HTML CSS JAVASCRICT in hindi | onclick event handler tutorial 1
 
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this tutorial is based on how to give a onClick event handler to change text using HTML and JAVASCRIPT (no use of CSS)
Views: 60 Coder GuruJi
JavaScript Tutorial: Eventhandler // onClick //deutsch
 
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Mit JavaScript Eventhandlern lassen sich bestimmte Ereignisse (Events) in einem bestimmten HTML-Element abfragen und damit ein JavaScript Funktion aufrufen. Ein Beispiel hierfür ist der JavaScript Eventhandler onClick, bei dem das Event des "Klicks" mit der Maustaste abgefragt wird. Weitere Beispiele und Erklärungen zum Thema JavaScript Eventhandler findest du hier:http://www.weltdertutorials.de/tutorials/javascript-tutorials/java-script-event-handler.html Du brauchst Hilfe bei deinem Projekt? https://www.facebook.com/groups/webdesignersupport ///////////////////////////////////////////////////////////////////////////////// Folge uns auf Facebook: http://facebook.com/htmlworld ...oder auf Twitter: http://twitter.com/htmlworld ...oder auf Google+: https://plus.google.com/u/0/111857058609754864160/posts Vielen Dank fürs zuschauen! Unterstützt unsere Arbeit mit einen Daumen! Über Feedback freuen wir uns auch immer ;)
Views: 5335 htmlworld
Angular 4 Tutorial 6: Events And @HostListener
 
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Learn what @hostlistener is in Angular and how to make use of hostlistener to attach events to elements. Full Angular 4 Playlist: https://www.youtube.com/playlist?list=PLYxzS__5yYQmi8f94KAGx1ofwFIn-FLNt codedamn is a now free platform for developers to learn and establish their credibility. Ready to be among developers? Register now! https://codedamn.com
Views: 29149 codedamn

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