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Javascript Articles
Page 516 of 534
How to either determine SVG text box width or force line breaks after 'x' characters?
Use the getBBox() function and add a single word at a time to a text object. When it gets too wide, you need to add a line feed.var a = Raphael(500, 500); var b = a.text(100, 100).attr('text-anchor', 'start'); var maxWidth = 100; var content = "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Duis nec semper mauris. Sed gravida augue feugiat nulla ultrices efficitur. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos. Sed sit amet lobortis eros, et lobortis diam. Aenean arcu velit, condimentum eu lacus in, dignissim bibendum odio. Mauris ultricies nunc et lorem ...
Read MoreHow to save HTML5 canvas data to file?
Use PNGStream to save HTML5 canvas to file.var f = require('fs') , out = f.createWriteStream(__dirname + '/text.png') , stream = canvas.pngStream(); stream.on('data', function(chunk){ out.write(chunk); }); stream.on('end', function(){ console.log(‘PNG Saved successfully!’); });
Read MoreWhich browsers support the HTML5 History API?
The WebKit-based browsers and Firefox 4 mainly supports the HTML5 History API. However, now almost every modern browser supports it.Firefox 4+Google ChromeInternet Explorer 10+Safari 5+iOS 4
Read MoreWorld Map on HTML5 Canvas or SVG
You can use SVG to create a World Map and work with raphaeljs.Firstly, learn how to add Raphael.js, and create a circle,var paper = Raphael(10, 50, 320, 200); // drawing circls var circle = paper.circle(50, 40, 10); circle.attr("fill", "#f00"); circle.attr("stroke", "#fff");Then refer the following to create a World Map.
Read MoreHTML5 Cross Browser iframe post message - child to parent?
The parent object provides a reference to the main window from the child.The following is the parent code. The directive below triggers the iFrame to send a message to the parent window every 3 seconds. No initial message from the main window needed!var a= window.addEventListener ? "addEventListener" : "attachEvent";// here a is the event method var b= window[a];// here b is the eventer var c= a== "attachEvent" ? "onmessage" : "message";// here c is the message event // Listen to message from child window b (c, function(e) { var d= e.message ? "message" : "data";// here d is ...
Read MoreZoom HTML5 Canvas to Mouse Cursor
The canvas always scales from its current origin. The default origin is [0, 0]. If you want to scale from another point, you can first do ctx.translate(desiredX, desiredY);. This will reset the origin of the canvas to [desiredX, desiredY].The translate() method remaps the (0, 0) position on the canvas. The scale() method scales the current drawing, bigger or smaller. If you want to translate() the canvas context by your offset, you need to first scale() it to zoom in or out, and then translate() back by the opposite of the mouse offset.These steps are given in the following examplectx.translate(pt.x, pt.y); ...
Read MoreAngularJS and HTML5 date input value - how to get Firefox to show a readable date value in a date input?
The elements of type date allows user to enter date, using a text box or using date picker. With the ng-model directive, bins the values of AngularJS application data to HTML input controls. Firefox does not currently support type="date". It will convert all the values to string. Sinceyou want date to be a real Date object and not a string, so we create another variable, and then link the two variables as done in the below given code function MainCtrl($scope, dateFilter) { $scope.date = new Date(); $scope.$watch('date', function (date){ $scope.dateString = dateFilter(date, 'yyyy-MM-dd'); ...
Read MoreCan you take a screenshot of the page using HTML5 Canvas?
Html2Canvas is a JavaScript library that can take screenshot of the whole web page or specific part. It doesn’t take the screenshot but creates the view based on the page information.ExampleBelow given is an example code. Here, html2canvas.js script is included at the . The html2canvas() method is called. Returns the base64 value, which eventually creates image source or an image file. Take screenshot function screenshot(){ html2canvas(document.body).then(function(canvas) { document.body.appendChild(canvas); }); }
Read MoreDoes HTML5 Canvas support Double Buffering?
For double buffering on the canvas, create a 2nd canvas element and draw to it. After that draw the image to the first canvas using the drawImage() method,// canvas element var canvas1 = document.getElementById('canvas'); var context1 = canvas1.getContext('2d'); // buffer canvas var canvas2 = document.createElement('canvas'); canvas2.width = 250; canvas2.height =250; var context2 = canvas2.getContext('2d'); // create on the canvas context2.beginPath(); context2.moveTo(10,10); context2.lineTo(10,30); context2.stroke(); //render the buffered canvas context1.drawImage(canvas2, 0, 0);
Read MoreIn JavaScript inheritance how to differentiate Object.create vs new?
In the first example, you are just inheriting amitBaseClass prototype.function SomeClass() { } SomeClass.prototype = Object.create(amitBaseClass.prototype);In the second example, you are executing the constructor function. An instance of amitBaseClass is created and you are inheriting the who complete amitBaseClass object.function SomeClass () { } SomeClass.prototype = new amitBaseClass ();So, both are doing separate work.
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