JavaScript and AJAX Web Development Tutorials

JavaScript, jQuery and AJAX (Asynchronous JavaScript and XML) Tutorials.
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Sometimes, we do not want people to copy the text on some of our web pages, here is a script which prevents user (not advanced users) from selecting the text. For better results put the JavaScript code inline and not in a separate JS file. // specify allowed tags for some browsers var...
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There are two elements that are used to specify conditions for formatting: The if element The choose element 1. The if element In XSLT, the if element provides a if – then construct. The syntax of if element is as shown below: <xsl: if test = “condition” >
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Introduction The throw statement allows you to create an exception. If you use this statement together with the try...catch statement, you can control program flow and generate accurate error messages. Use the throw statement to throw an exception. When you throw an exception,...
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The DOM enabled parser is used for accessing the features of the application. The parser reads the XML document and parses to check that it is valid. The in memory representation of the XML document containing the elements is organized in the tree structure. There are nodes in the structure. ...
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All web developers require to implement some JavaScript in their web applications. JavaScript arrays support a few in-built array manipulation methods like push,pop, but we might require more like unshift, shift, sort, shuffle, contains, clear and others. In JavaScript array being an...
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Continuation of Extending JavaScript Arrays. Some more functions to extend the array manipulation capabilty of JavaScript. /* Shuffles the Array elements randomly */ Array.prototype.shuffle=function() { var i=this.length,j,t; while(i--) {
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Introduction The second type of procedure is called a function. Like a subroutine, a function also holds a series of VBScript statements. The only difference is that a function actually returns a value to the code statement that called it. A function is a block of code that can be called from...
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We sometimes require to get the query parameters of an URL in JavaScript, here's how we can do that. // get the current URL var url = window.location.toString(); //get the parameters url.match(/\?(.+)$/); var params = RegExp.$1; // split up the query string and store in an //...
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// The functions have been adapted from various sources // and re-written to provide maximum flexibility // and compatability with various browsers. //Global Declarations var ie = (document.all) ? true : false; function toggleClass(objClass){ // This function will toggle obj...
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There are multiple ways to attach an event handler in jQuery but all of them does not function exactly the same way. If there are elements created after DOM is loaded, then not all the events associated with them would be triggered if you have not attached the event handlers correctly. Example ...
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Web-pages can take take time to load for variety of reasons and if your page takes lot of time to load you have to identify areas where most of the time is taken. I have seen that in most cases it is always the Advertisements. At least that was the case for Go4Expert. My next step was to load...
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On many forums like DigitalPoint you would see lots of people claiming to be making thousands of $$$ with an ebook that costs $1 and have lots of screenshots to show you as well. Never trust those. This can be done in Firefox and IE7 with just one line of code. Yes its true. One line exactly. ...
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Have you ever wondered when you see form on some website submitted in a fraction of a second? Have you ever wanted such forms on your site? This is it. Let us take a sample form. <form method="post" action="SubmitToSomeFile" id="frm" accept-charset=UTF-8 name="frm"> <table...
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What is AngularJs? AngularJS is an open source web application framework; to be more precise, javascript framework. It is introduced mainly to address and overcome the challenges of developing single page applications (SPA). It is framework for front end model-view-controller (MVC) architecture,...
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When the user creates a document in HTML, the browser is capable of understanding and using the tags. When XML is used, the browser does not know how to display the elements. The XSL language is used for this purpose. The XSL language has two parts as follows XSL Transformation (XSLT): The...
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JavaScript is the scripting language and is used for the web. It is used webpages for validating forms,adding different functionalities , for detecting different browsers and creating cookies. One can also improve the design of web page using JavaScript. With the help of JavaScript one can work on...
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There is a "bug" with the parseInt JavaScript function. The bug is not something that will affect you very often, but it is something you should be aware of. We've seen the bug in every browser except Opera. I've created a button to demonstrate the bug. The bug is that parseInt can return an...
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While designing web pages we several time needs scripts that check our data and validate it. Checking Email address file is one of the most commonly used scripts which we need for all registration purpose. While checking email, we need to focus on following points. An email address...
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Whenever we write form validation scripts, we usually have to write some code for each of the form elements we have to validate, wouldn't it have been better if we had a generic class which would check the form elements based on a few parameters.This is where JavaScript Triggers come into being,...
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XML was developed and introduced as a vehicle for data interchange, but not all developers embraced it with open arms. Some developers actually opted to develop alternatives. One such alternative is JSON (http://www.json.org/) (JavaScript Object Notation). In this article, I take a closer look at...
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