Stephen's JavaScript Blog

You don't have to learn any JavaScript in order to use it. There are plenty of JavaScripts around that can be plugged straight into your web page and work. Others need ... Read More

JavaScript can modify your JavaScript for you When you write your JavaScript you should lay it out all nicely with loads of spaces, indentation, and comments. This makes it easier to ... Read More

JavaScript can run from the bookmarks menu to help you see what the JavaScript in the web page is doing. With this JavaScript bookmarklet you can easily find out if a ... Read More

Just how secure is Ajax? The fifteenth tutorial on Ajax looks at the security issues associated with using Ajax. An Ajax application can be just as secure as any other computer ... Read More

There are all sorts of different menus that you can add to your page with JavaScript The double cross bar menu is one that is popular with some sites. Selecting an ... Read More

Unobtrusive form validation is possible In this twenty third modern JavaScript tutorial we look at how to redesign the way that JavaScript interacts with forms so as to make all of ... Read More

Dropdown lists are very easy to validate with JavaScript Since the only possible values that a drop down list can have are the ones that you code into the list, the ... Read More

HTML Tidy can mess up your JavaScript code. Running HTML Tidy is a good way to tidy up your HTML and correct a lot of the minor errors it may contain. ... Read More

JavaScript does have some access to things outside of the web page. Some JavaScripts, animations in particular, need to know where the mouse cursor is on the page. Different browsers provide ... Read More

Convert to the upper and lower case combination you require with JavaScript JavaScript itself is case sensitive. All JavaScript reserved words, DOM references, and event handlers etc all have to be ... Read More

Many people misunderstand the real difference between GET and POST One problem with using GET requests with Ajax is that such requests were designed to retrieve static information. This means that ... Read More

Collapsing menus when not required saves space on the web page I wrote my original collapsible menu script some years ago before making JavaScripts unobtrusive became practical. A recent request from ... Read More

Properly written JavaScripts will not interfere with each other. In this twenty second modern JavaScript tutorial we look at how you can not only make your JavaScript unobtrusive so that it ... Read More

One of the easiest form fields to validate in JavaScript (but the one that gives many people the most trouble) are radio buttons. In this tutorial we look not only at ... Read More

JavaScript can help your visitors start filling out a form without having to use their mouse first. What normally happens when you add a form to your web page is that ... Read More

JavaScript irons out browser differences Testing what colour or background colour part of your page is set to is not as straightforward as it ought to be. When you use JavaScript ... Read More

JavaScript allows you to add your own classes and objects If you have several arrays that contain numbers and you want to make working with those arrays easier then take a ... Read More

You can submit a second Ajax request before the first returns provided you code it the right way. In all of the preceding Ajax tutorials we have looked at how to ... Read More

Which piece of JavaScript runs when? To someone experienced with using JavaScript it is really obvious which parts of the code will be run at what stage in the processing of ... Read More

JavaScript is a prototyping language. You are not limited to just those objects that JavaScript has already defined or even to extending those objects (which would allow you to create objects ... Read More

One of the first types of JavaScript you are likely to need to write for yourself is to validate a form. Before we start looking at how to validate form fields ... Read More

Don't rely on JavaScript to protect your images! The only effective way to protect images on your web site is to watermark them. Find out why this method works while the ... Read More

Some JavaScript commands are so inefficient and so rarely needed that you have to wonder why they are included in JavaScript in the first place. "eval" is one of the most ... Read More

Use the right tools for the job. While it is possible to put screws in with a spanner a screwdriver works far more effectively. Of course that screwdriver wont help ... Read More

Sometimes when waiting for an Ajax response the situation changes so that you no longer need it. Since Ajax is normally run asynchronously where we don't wait for the response to ... Read More

What happens when you include HTML comments inside your JavaScript? When JavaScript was first introduced, only Netscape 2 supported it and so it was necessary to hide the JavaScript from browsers ... Read More

When JavaScript doesn't provide the method you need you can add it yourself. In the last few modern JavaScript tutorials we have looked at the many different objects that JavaScript defines ... Read More

If you have been following the original series of JavaScript tutorials over the last 30 or so weeks then you now have a basic knowledge of JavaScript. The final tutorial in ... Read More

JavaScript has powerful array functionality. Sometimes just a few lines of JavaScript can do quite a lot. Many countries these days have some sort of lottery or lotto or pools (or ... Read More

JavaScript can create all sorts of calculators, You just need to know how the calculation is done. When someone enters their height and weight into this JavaScript calculator then they will ... Read More

JavaScript can handle both simple and complex calculations. The loan and repayment JavaScript calculators use the "nominal" interest rate which the lender divides by the number of times it is to ... Read More