JavaScript and AJAX Web Development Tutorials

JavaScript, jQuery and AJAX (Asynchronous JavaScript and XML) Tutorials.
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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,...
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...
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...
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...
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...
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 ( (JavaScript Object Notation). In this article, I take a closer look at...
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...
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...
// 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...
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...
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...
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...