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Javascript Articles
Page 515 of 534
MediaStream in HTML5
The MediaStream represents synchronized streams of media. If there is no audio tracks, it returns an empty array and it will check video stream, if webcam connected, stream.getVideoTracks() returns an array of one MediaStreamTrack representing the stream from the webcam.function gotStream(stream) { window.AudioContext = window.AudioContext || window.webkitAudioContext; var audioContext = new AudioContext(); // Create an AudioNode from the stream var mediaStreamSource = audioContext.createMediaStreamSource(stream); // Connect it to destination to hear yourself // or any other node for processing! mediaStreamSource.connect(audioContext.destination); } navigator.getUserMedia({audio:true}, gotStream);
Read MoreStop Web Workers in HTML5
Web Workers allow for long-running scripts that are not interrupted by scripts that respond to clicks or other user interactions and allows long tasks to be executed without yielding to keep the page responsive.Web Workers don't stop by themselves but the page that started them can stop them by calling terminate() method.worker.terminate();A terminated Web Worker will no longer respond to messages or perform any additional computations. You cannot restart a worker; instead, you can create a new worker using the same URL.
Read MoreCreating content with HTML5 Canvas much more complicated than authoring with Flash
Flash provides amazing GUI and lots of visual features for animations. It allows the user build everything inside a particular platform without a full integration into the browser wrapped inside the browser with the main scopes that are multimedia and other kinds of animation.HTML5 element gives you an easy and powerful way to draw graphics using JavaScript. It can be used to draw graphs, make photo compositions or do simple (and not so simple) animations.Here is a simple element which has only two specific attributes width and height plus all the core HTML5 attributes like id, name, and ...
Read MoreWhat is composition in HTML5 Canvas?
HTML5 canvas provides compositing attribute globalCompositeOperation that affect all the drawing operations.ExampleWe can draw new shapes behind existing shapes and mask off certain areas, clear sections from the canvas using globalCompositeOperation attribute as shown below in the example. var compositeTypes = [ 'source-over','source-in','source-out','source-atop', 'destination-over','destination-in','destination-out', 'destination-atop','lighter','darker','copy','xor' ]; function drawShape(){ for (i=0;i
Read MoreHow to handle mousedown and mouseup with HTML5 Canvas
To handle the mousedown and mouseup event with HTML5 Canvas,var mouseDown = false; // for mousedown canvas1.onmousedown = function(event){ dragOffset.x = event.x - mainLayer.trans.x; dragOffset.y = event.y - mainLayer.trans.y; mouseDown = true; } // for mouseup canvas1.onmouseup = function(event){ if(mouseDown) mouseClick(eevent mouseDown = false; }
Read MoreHow to display HTML5 client-side validation error bubbles?
To display HTML5 client-side validation error bubbles, use the required attribute.You do not need to have JavaScript for client side validations like empty text box would never be submitted because HTML5 introduced a new attribute called required which would be used as follows and would insist to have a value: Enter email : Try to submit using Submit button
Read MoreIE supports the HTML5 File API
IE9 does not support File APIIF10 started supported File APIAn example of that would be drag and drop. Now HTML 5 came up with a Drag and Drop (DnD) API that brings native DnD support to the browser making it much easier to code up. #boxA, #boxB { float:left;padding:10px;margin:10px; -moz-user-select:none; } #boxA { background-color: #6633FF; width:75px; height:75px; } #boxB { background-color: #FF6699; width:150px; height:150px; } function dragStart(ev) { ...
Read MoreMake HTML5 Canvas fill the whole page
To make canvas fill the whole page, you need to be 100% in width and height of the page.* { margin: 0; padding: 0; } body, html { height:100%; } #canvas { position:absolute; height:100%; width:100%; }
Read MoreIs there any way to embed a PDF file into an HTML5 page?
To embed a PDF file in an HTML5 page, use the element. HTML iframe Tag HTML5 Tutorial
Read MoreWhat is the correct use of schema.org SiteNavigationElement in HTML?
The schema.org SiteNavigationElement extends WebPageElement. It is used to mark-up links that would make amazing contextual links. Home page My demo page
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