Stephen's JavaScript Blog May 2007 Archive

JavaScript doesn't just run in web pages, most web browsers allow you to attach JavaScript into the browser that can then run against all or selected pages. User scripts are Javascripts ... Read More

Regular Expressions can be used to do a search and replace on your content. The third tutorial on "regular expressions" shows you how to use the string.replace method to replace parts ... Read More

JavaScript can use Unicode characters The ASCII character set is limited to 128 different characters and 32 of those are reserved for control characters. Unicode solves this shortage by using one, ... Read More

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

You don't need to learn JavaScript to be able to use it. There are lots of places on the web where you can obtain Javascripts that have already been written and ... Read More

JavaScript can update the information in the page to explain what your visitors don't understand Some people prefer that additional details about a term or link on their web page be ... 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

Regular Expressions can ignore capitals and find all matches The second tutorial on Regular Expressions covers how to set the expression for global processing and to ignore capitalization. Ignore Case and Global

Not all books on Ajax are created equal. The second edition of "professional Ajax" is much larger than the first and covers a far wider range of ways to use Ajax ... 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 can change link behaviour One thing a lot of people like to do with their web site is to have all of the external links open in a new window ... 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

JavaScript can handle multiple values in the same form field. On some occasions you will have a selection list or radio buttons on a form on your web page where you ... Read More

JavaScript supports most regular expression constructs. Introducing a new series of tutorials on regular expressions. In this first tutorial we look at how to define a regular expression and use it ... Read More

JavaScript can display passwords in plain text The password fields in HTML forms display your password as asterisks but the actual value is still just plain text as this simple bookmarklet ... Read More

JavaScript belongs in a separate file linked from the head of your page. There is no longer any need to clutter the body of your web page with event handlers attached ... Read More

You can embed JavaScript into XHTML if you absolutely must XHTML treats embedded Javascript code slightly differently from the way HTML does. You need a small piece of extra code to ... Read More

Test if the browser supports a specific JavaScript Feature directly, do not whether the browser was one that did or didn't support that feature ten years ago. Right from day one ... Read More

Keep JavaScript out of your HTML As an alternative to placing an onload attribute into your body tag you can set up a global onload event handler. This is one way ... Read More

JavaScript supports Regular Expressions almost the same way that server side languages do A regular expression is a pattern that uses a special syntax to describe the content of a text ... 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

Form field names are uised to pass the information to the server The names that you give to the fields in your form in order for the server side processing to ... Read More

Web pages are open source and there is nothing you can do to protect the content Every so often I receive emails about my Image Protection javascript that places the image ... Read More

JavaScript can provide for all sorts of useful calculations This Javascript calculator shows you the effects of mixing various quantities of paint. See for yourself the effect of mixing various quantities ... 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

Changing the size of the browser affects animations In the seventeenth animation tutorial we look at how to detect when the browser has been resized so that we can adjust the ... Read More

Not all browsers provide the same means for JavaScript to tell if an image has loaded If your site uses images remotely loaded from another site to display advertising (or for ... Read More