Javascript Articles - Page 539 of 671

To listen to KeyDown events, use −if(keyIsPressed && keycode == somenumber) {    doSomething(); }To capture KeyDown −var canvas1 = layer.getCanvas()._canvas; $(canvas1).attr('tabindex', 1); canvas1.focus(); $(canvas1).keydown(function (event) {    console.log(event); });

To choose, you need to define a wrapper function −function display ( file ) {    if ( window.webkitURL ) {       return window.webkitURL.createObjectURL( file );    } else if ( window.URL && window.URL.createObjectURL ) {       return window.URL.display( file );    } else {    return null;    } }After that set it for cross-browser −var url = display( file );

To play HTML blocks one by one, use the following HTML first −         The following is what you need to do to play audio one by one −var one = document.getElementById('one'); one.onended = function() {    document.getElementById('two').play(); } one.play();

For Geolocation enableHighAccuracy, you need to set it to true −enableHighAccuracy: trueIf you still fail in getting the result i.e. handling the timeout error, then again try it withenableHighAccuracy: falseThe above would work on Android, Chrome, and Firefox as well.

To draw a circle with transparent background and border-radius, use the following CSS −body {    background: repeating-linear-gradient(45deg, white 0px, green 100px);    height: 400px;    background-size: 400px 400px;    background-repeat: no-repeat; } html {    height: 100%; } #box {    position: absolute;    width: 400px;    height: 400px;    border: solid blue 2px;    animation: colors 5s infinite; } #demo {    width: 50%;    height: 100%;    right: 0px;    position: absolute;    overflow: hidden;    transform-origin: left center;    animation: cliprotate 18s steps(2) infinite;    -webkit-animation: cliprotate 18s steps(2) infinite; } .circlehalf {    box-sizing: border-box; ... Read More

HTML5 canvas provides two important methods to save and restore the canvas states.Canvas states are stored on a stack every time the save method is called, and the last saved state is returned from the stack every time the restore method is called.Sr.No.Method and Description1save()This method pushes the current state onto the stack..2restore()This method pops the top state on the stack, restoring the context to that state.                                                              ExampleYou can try ... Read More

HTML5 canvas provides rotate(angle) method which is used to rotate the canvas around the current origin.This method only takes one parameter and that's the angle the canvas is rotated by. This is a clockwise rotation measured in radians.ExampleYou can try to run the following code to rotate HTML Canvas −                    #test {             width: 100px;             height:100px;             margin: 0px auto;          }             ... Read More

To play randomly, add the songs like this −init ([    'http://demo.com/songs/song1.mp3,    'http://demo.com/songs/song2.mp3,    'http://demo.com/songs/song3.mp3 ]);Use the following to play randomly using Math.random −function displayRandom() {    var audio = Math.floor(Math.random() * (collection.length));    audio = collection[audio];    audio.play();    setTimeout(loop,audio.duration*1000); }

HTML5 canvas provides the necessary methods to draw an image and erase it completely. We can take JavaScript help to simulate good animation over an HTML5 canvas.ExampleYou can try to run the following code to perform basic HTML5 Canvas Animation −                    var pattern= new Image();          function animate(){             pattern.src = '/html5/images/pattern.jpg';             setInterval(drawShape, 100);          }          function drawShape(){             // get the canvas ... Read More

Add the following in the bottom −NETWORK: *Set the version number of the manifest in the URL with the path.In addition, set −CACHE MANIFEST #rev ?v = 42 /css/style.css?v = 20 /js/myscript.js?v = 20