JavaScript and AJAX Web Development Tutorials

JavaScript, jQuery and AJAX (Asynchronous JavaScript and XML) Tutorials.
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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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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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Today, we'll see how to implement a bouncing ball in javascript. The ball will bounce all around the page and we will also introduce a gravity factor to make the ball slowly come to rest. The technique is what is important here. It can then be used in any kind of moving-object animation. What...
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The first of its kind Web Technology Conference on Open Source Technology, WebOSS '07 was organised in Kolkata on Sat, 13th Oct 07 and I spoke at the event as one of the participants on "Building Applications using AJAX". Here I will share my presentation, the PDF copy download requires you to...
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Introduction Ajax, or AJAX, is a web development technique used for creating interactive web applications. The intent is to make web pages feel more responsive by exchanging small amounts of data with the server behind the scenes, so that the entire web page does not have to be reloaded each...
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Background Many time we found the file worm.vbs in our computer in each dir. worm.vbs may or may not be malicious. but when they execute's they consume CPU. So, Better option is to remove them. but it is tough job as they exist in each dir. I written a vbScript to...
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Introduction One Javascript function that gets used such frequently than it should to be is "eval". "eval" evaluates the content of a text string passed to it and then executes it as if it were normal Javascript code.. Actually, we should never use eval for any purpose in our code, be it...
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I needed to trim a string and also replace more than one spaces with a single space. The solution was simple with String.replace in JavaScript. Here's the code: var m = " My name is Pradeep "; m = m.replace(/^+/,'').replace(/+$/,'').replace(/{2,}/,' '); Making a function out of it. ...
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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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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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There are hundreds of DHTML trees available online, most of them and written from scratch, some easy to understand and implement, while others are real pain to customize. Some of them need a JavaScript array to be populated or read an XML file to generate the tree. I've tried to develop one...
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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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A look at how AJAX works This tutorial will show you how ajax works and how to use it from a web developers standpoint. Ever wonder how things like G-Talk work? they don't reload the page or use Iframes and yet they always appear to have the data thats coming in instantly. it acomplishes this...
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Introduction Some characters are reserved in HTML. For example, you cannot use the greater than or less than signs within your text because the browser could mistake them for markup. If we want the browser to actually display these characters we must insert character entities in the HTML...
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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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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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Programming errors are a fact of life, but pulling your hair out while tracking down these errors should not be. More robust development languages such as Java and the .NET family of languages have development environments that simplify the process of tracking down problems. JavaScript developers...
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Introduction A random number generator (often abbreviated as RNG) is a computational or physical device designed to generate a sequence of numbers or symbols that lack any pattern, i.e. appear random. Computer-based systems for random number generation are widely used, but often fall short of...
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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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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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