Javascript Articles - Page 532 of 671

An input.the valueAsDate method returns a Date object reflecting the input's current value. The displayed value follows the same format. To make it work:new Date().toISOString().substr( 0, 10 ); new Date().toLocaleDateString(); input.valueAsDate; input.valueAsDate.toLocaleDateString(); new Date( input.valueAsDate ); new Date( input.valueAsDate ).toISOString().substr( 0, 10 );

To create a DragEvent, use the protractor API. The official documentation states:The browser.get method loads a page. Protractor expects Angular to be present on a page, so it will throw an error if the page it is attempting to load does not contain the Angular library. (If you need to interact with a non-Angular page, you may access the wrapped web driver instance directly with browser.driver).Use the following pattern as well:browser .actions() .dragAndDrop(myEle, {x:100,y:100}) .perform();

To solve the Uncaught Security Exception, you need to add the crossorigin attribute: function getBase64() {    var myImg = document.getElementById("myid");    var c = document.createElement("canvas");    c.width = myImg.width;    c.height = myImg.width;    var context = c.getContext("2d");    context.drawImage(img, 0, 0);    var dataURL = c.toDataURL("image/png");    alert(dataURL.replace(/^data:image\/(png|jpg);base64,/, "")); } getBase64();

For full page drag and drop files, try the following code:var myDrop = document.getElementById('dropZone'); function displayDropZone() {    myDrop.style.visibility = "visible"; } function hideDropZone() {    myDrop.style.visibility = "hidden"; } function allowDrag(ev) {    if (true) {       ev.dataTransfer.dropEffect = 'copy';       ev.preventDefault();    } } function handleDrop(ev) {    ev.preventDefault();    hideDropZone();    alert('This is Drop!'); } window.addEventListener('dragenter', function(ev) {    displayDropZone(); }); myDrop.addEventListener('dragenter', allowDrag); myDrop.addEventListener('dragover', allowDrag); myDrop.addEventListener('dragleave', function(e) {    hideDropZone(); }); myDrop.addEventListener('drop', handleDrop);

To make a element to be recognized by Safari:main {    display: block;    width: 800px;    height: 800px;    background-color: #0C0; }You need to focus on:main {    display: block; }

To solve the issue for HTML5 meta viewport, you can any of the following fix:You can also try this:Let us say you have a site width of 100px, then it won’t display the whole page, withinitial-scale = 1

To send a file and parameters within the same XMLHttpRequest:var myForm = new FormData(); myForm.append('param1', 'demo'); myForm.append('param2', 6767); myForm.append('myDir', 'public-data'); myForm.append('demofile', file); xhr.send(myForm);

To enhance HTML5 canvas performance:Image smoothing should be disabledRender in half resolutionUse drawImage() to update main canvas You need to use integer coordinates and sizesUsage of requestAnimationFrame() You need to use while loops as often as you can

To draw image onto the canvas, use the HTML5 drawImage() method:                    function drawShape(){             // get the canvas element using the DOM             var canvas = document.getElementById('mycanvas');                       // Make sure we don't execute when canvas isn't supported             if (canvas.getContext){                // use getContext to use the canvas for drawing                var ctx = canvas.getContext('2d');                // Draw shapes                var img = new Image();                img.src = '/images/backdrop.jpg';                img.onload = function(){                   ctx.drawImage(img,0,0);                   ctx.beginPath();                   ctx.moveTo(30,96);                   ctx.lineTo(70,66);                   ctx.lineTo(103,76);                   ctx.lineTo(170,15);                   ctx.stroke();                }             } else {                alert('You need Safari or Firefox 1.5+ to see this demo.');             }          }                        

You need to try the following to take photo from webcam using HTML5:Declare variablesvar streaming = false,    video = document.querySelector('#video'), canvas = document.querySelector('#canvas'),    photo = document.querySelector('#photo'),    startbutton = document.querySelector('#startbutton'),    width = 320,    height = 0;Using getUserMedianavigator.getMedia = ( navigator.getUserMedia ||                 navigator.webkitGetUserMedia ||                   navigator.mozGetUserMedia ||                    navigator.msGetUserMedia);