To get the pixel color from canvas, use the following code. This returns the color in rgba −var index = (Math.floor(y) * canvasWidth + Math.floor(x)) * 4 // color in rgba var r = data[index] var g = data[index + 1] var b = data[index + 2] var a = data[index + 3]

To show it, use the following −You can also go for CSS −input[type="date"]::before{    color: #ffffff;    content: attr(placeholder) ": "; } input[type="date"]:focus::before {    content: "" !important; }

The autofocus attribute is a boolean attribute. When present, it specifies that an element should automatically get focus when the page loads. An example is given below                    First Name:          Last Name:                    

The putImageData() method places the image data onto the canvas. To animate canvas, we create a reusable ImageData object outside the main loop,var ct = c.getContext("2d", {alpha: false});       // context without alpha channel. var a = ct.createImageData(c.width, c.height);   var buffer = new Uint32Array(a.data.buffer);   function loop() {    noise(ct);    requestAnimationFrame(loop) })() function noise(ct) {    var l =buffer.length - 1;    while(l--) buffer[l] = Math.random() >0;    ct.putImageData(a, 0, 0); }

The date picker in HTML5 basically works very similar to how the JavaScript Libraries did, when we focus on the field a calendar will pop out, and then we can navigate through the months and years to select the date.Therefore, if you want the date input to use more spacing and a color scheme you could add the following to your code.::-webkit-datetime-edit { padding: 2 em; } ::-webkit-datetime-edit-fields-wrapper { background:green; } ::-webkit-datetime-edit-text { color: blue; padding: 0 0.3em; } ::-webkit-datetime-edit-month-field { color: red; } ::-webkit-datetime-edit-day-field { color: orange; } ::-webkit-datetime-edit-year-field { color: red; }

In order to change colour of image drawn on an HTML5 Canvas element, you can try to run the following code. Use the drawImage() method − Example: Code to change color of image function display(img1, red, gr, bl) { //func to change color of image     var canvas1 = document.createElement('canvas');//canvas element initialisation canvas1.width = img.width;//canvas width initialisation     canvas1.height = img.height; //canvas height initialisation var ctx1 = canvas1.getContext('2d');     ctx1.drawImage(img, 0, 0); var myImg =ctx1.getImageData(0, 0, canvas1.width, canvas1.height); for (var t=0;t< myImg.data.length;t+=4) {            myImg.data[t]= red | myImg.data[t]; ... Read More

There are similar rules for native mobile apps and application. Only domain needs are to be added to white list in PhoneGap or Cardova.The device acts as a server and can access content from URL .If PhoneGap is used then domains are added to whitelist or a wildcard.While dealing with a native application, you expect to make requests from file://, instead of from https://. However, a request is not made across the HTTP protocol, so the same rules do not apply.Making requests from native mobile app, will allow you to make requests to any domain without any major issues. Read More

When we apply z index to a canvas whose position is fixed, it stop causes chrome to render all other elements which have position:fixed properly. This only happens if canvas is greater than 256X256 px in size.Wrap both h1 and canvas with the fixed div and solves the issue −    Test Title     The following is the CSS −h1{    position: fixed; } body{    height: 1500px; } canvas{    position: fixed; z-index: -10; }

One of the divs, when placed in another style sheet, can make menu invisible in Internet Explorer.If opacity property is used which is not a cross-border solution, it should be like the following to display −opaque {      -ms-filter:"progid:DXImageTransform.Microsoft.Alpha(Opacity=70)"; // first      filter: alpha(opacity=90);  // second }

In order to get latitude and longitude using an HTML5 Geolocation or any Google API, we need to add JavaScript for this. The script is as follows −if (navigator.geolocation) {    /*  If current position is obtained then there is success otherwise there is failure.    On failure, separate error message is shown  */        navigator.geolocation.getCurrentPosition(successFunc, errorFunc); }  else {        alert(‘Geolocation is not enabled in your browser. Please use a latest browser to supports it.'); }