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Javascript Articles
Page 507 of 534
Working with tag in HTML5
You can try to run the following code to learn how to work with the tag in HTML5: #svgelem{ position: relative; left: 50%; -webkit-transform: translateX(-40%); -ms-transform: translateX(-40%); transform: translateX(-40%); } SVG HTML5 SVG Star
Read MoreHow to draw large font on HTML5 Canvas?
To draw large font properly in HTML5 Canvas, you can try to run the following code:var myCanvas = document.getElementById("myCanvas"); var context = c.getContext("2d"); context.font = '180pt Georgia'; context.strokeStyle = "#FF0000"; context.fillStyle = "#FFFFFF "; context.lineWidth = 34; context.fillText("Demo!",0,200); context.strokeText("Demo!",0,200);
Read MoreHow to display rupee symbol in HTML
The rupee symbol is the following and not every browser supports it:₹To make it visible on your web page: You can use the following as well:₹
Read MoreComposition attribute in HTML5 Canvas?
HTML5 canvas provides compositing attribute globalCompositeOperation that affect all the drawing operations. 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 < compositeTypes.length; i++){ var label = document.createTextNode(compositeTypes[i]); document.getElementById('lab'+i).appendChild(label); var ctx = document.getElementById('tut'+i).getContext('2d'); // draw rectangle ctx.fillStyle = "#FF3366"; ctx.fillRect(15,15,70,70); // set composite property ctx.globalCompositeOperation = compositeTypes[i]; // draw circle ctx.fillStyle = "#0066FF"; ctx.beginPath(); ctx.arc(75,75,35,0,Math.PI*2,true); ctx.fill(); } }
Read MoreBlending two images with HTML5 canvas
To blend, you need to perform blending of two images in proportion 50-50.Let us see how: Blended image window.onload = function () { var myImg1 = document.getElementById('myImg1'); var myImg2 = document.getElementById('myImg2'); var myCanvas = document.getElementById("canvas"); var ctx = canvas.getContext("2d"); // width and height var w = img1.width; var h = img1.height; myCanvas.width = w; myCanvas.height = h; var pixels = 4 ...
Read MoreHTML5 IndexedDB Example
The following function is an example of IndexedDB to add data:function add() { var request = db.transaction(["employee"], "readwrite") .objectStore("employee") .add({ id: "001", name: "Amit", age: 28, email: "demo1@example.com" }); request.onsuccess = function(event) { alert("Amit has been added to your database."); }; request.onerror = function(event) { alert("Unable to add data\rAmit is already exist in your database! "); } }Above, we added the following details in the database:const employeeData = [ { id: "001", name: "Amit", age: 28, email: "demo1@example.com" }, ];
Read MoreExample of createSignalingChannel() in HTML5
Web RTC required peer-to-peer communication between browsers. This mechanism required signalling, network information, session control and media information. Web developers can choose different mechanism to communicate between the browsers such as SIP or XMPP or any two way communications. An example of createSignalingChannel():var signalingChannel = createSignalingChannel(); var pc; var configuration = ...; // run start(true) to initiate a call function start(isCaller) { pc = new RTCPeerConnection(configuration); // send any ice candidates to the other peer pc.onicecandidate = function (evt) { signalingChannel.send(JSON.stringify({ "candidate": evt.candidate })); ...
Read MoreHow to detect a particular feature through JavaScript with HTML
Use Modernizr in HTML to detect a feature like audio through JavaScript:if (Modernizr.audio) { /* properties for browsers that support audio */ } else{ /* properties for browsers that does not support audio */ }
Read MoreHow to check web browser support in HTML5
You can try to run the following code to detect a web worker feature available in a web browser: Big for loop function myFunction(){ if (Modernizr.webworkers) { alert("Congratulations!! You have web workers support." ); } else{ alert("Sorry!! You do not have web workers support." ); } } Click me The following is the result:
Read MoreLog error to console with Web Workers in HTML5
Here is an example of an error handling function in a Web Worker JavaScript file that logs errors to the console.ExampleWith error handling code, above example would become like the following: Big for loop var worker = new Worker('bigLoop.js'); worker.onmessage = function (event) { alert("Completed " + event.data + "iterations" ); }; worker.onerror = function (event) { console.log(event.message, event); }; function sayHello(){ alert("Hello sir...." ); }
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