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HTML Articles
Page 136 of 151
Prevent iPhone from zooming in web-app with HTML \\n
Giving a meta tag attribute "user-scalable=no" will restrict the user from zooming elsewhere. Prevent zooming all together by adding this meta tag to your head tag. This tells the mobile browser to use the same width scale and will not allow the user to zoom in at all, hence also disables that annoying behavior. However, some might argue that this is not a very user-friendly way to handle the problem.The element, used along with one or more elements, creates a drop-down list of options for a web form. The element creates the list and each element is ...
Read MoreGet pixel color from canvas with HTML
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]
Read MoreNot showing a placeholder for input type=“date” field with HTML5. How to solve it?
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; }
Read MoreAnimating canvas to infinitely animate the noise to give the appearance of movement in HTML
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); }
Read MoreHTML5 Canvas & z-index issue in Google Chrome
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; }
Read MoreMenu not visible in IE8. How to make it visible with HTML?
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 }
Read MoreHow do I get an address latitude-longitude using HTML5 Geolocation or Google API?
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.'); }
Read MoreHTML5 semantic elements and which old browsers does it support?
Internet Explorer 8 and older versions does not support semantic elements like nav, header and article. To style semantic elements, Modernizer is used. Some CSS can be added to block CSS by default.article, header, nav, section, footer { display:block; }We can also create our own elements through JavaScript by writing following code − document.createElement('nav'); //nav is semantic element document.createElement('header'); //header is semantic element document.createElement('article'); //article is semantic element
Read MoreHTML5 Canvas and select / drag-and-drop features in a JS library?
If you want to use HTML5 canvas to draw shapes, texts and curves and also want to attach traditional DOM events like onClick or drag and drop functions, a crossbar framework Raphael is used for doing drag and drop or touch events.This technology uses SVG and XML for older versions of IE. Drag and drag using HTML is shown below. Example Raphaël · Drag-n-drop ...
Read MoreHow to use multiple click event on HTML5 canvas?
When there is a circle drawn on canvas and we put red color on half and grey color on a portion of a circle, then on clicking a red color, we call function1.On clicking grey part, function 2 is called and we need to use reusable path objects to store different parts, which we want to test. Click handler can be used to share the canvas and do our desired work. Path2D objects can be used to store path information.var path1 = new Path2D(); var path2 = new Path2D(); var newpaths = [path1, path 2]; // Array is ...
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