JavaScript is good at doing calculations and conversions. Enable those who are yet to convert to metric (or those who already have if you haven't) to figure out what the measurements ... Read More

There are many different conversions that can be done using JavaScript This script adds a cooking calculator to your page that handles most of the common and some not so common ... Read More

JavaScript calculators can perform whatever calculations you like as long as you know the appropriate fomulae. Here's a JavaScript calculator for those with health and diet web sites. Given a couple ... Read More

Different objects need different sorts of loops The easiest way to process objects, arrays, and nodelists is by using a loop to step through all the entries. How you do this ... Read More

You need to provide your visitors with some way to run your JavaScript. Often the JavaScript that you have in your page that you want to have run on visitor request ... Read More

How many days are there between two dates? JavaScript can work it out for you easily. The number of days between two dates can be easily worked out in JavaScript by ... Read More

Objects have both Properties and Methods In the last couple of tutorials on Regular Expressions we looked at all of the different properties that these objects have in JavaScript. The twenty ... Read More

You can't solve every JavaScript problem yourself. Everyone will at least occasionally strike problems with JavaScript code that they can't solve themselves. Fortunately there are plenty of people out there who ... Read More

Internet Explorer runs JScript rather than JavaScript. Most JavaScript is also valid as JScript but Internet Explorer does have a few quirks. Internet Explorer does a reasonably good job of following ... Read More

Not even the experts get their JavaScript right first time every time. Everyone makes mistakes, particularly when writing a new program. What you have to do with your program is to ... Read More

When you use getElemensByTagName or getElementsByName JavaScript receives a nodelist While the nodelist that some DOM calls return to JavaScript looks a little like an array there are some important differences ... Read More

ActiveX is not a part of JavaScript A lot of people start with code that works on Internet Explorer which they can't get to work on other browsers. Often the cause ... Read More

JavaScript and JScript are two separate languages that share a lot of common commands. Since Internet Explorer runs JScript (and vbScript) rather than JavaScript it would be impossible to write scripts ... Read More

There are many properties you will probably never use with regular expressions The twenty first tutorial on Regular Expressions looks at those properties of Regular Expressions that are not often used. ... Read More

Whether you call it Noughts and Crosses or Tic-Tac-Toe, this JavaScript will be hard to beat Another unobtrusive JavaScript for you, this one a simple children's game. Your visitor goes first ... Read More

There is more than one way of animating things with JavaScript. One way to animate something using JavaScript is to attach it to the mouse so that it follows the mouse ... Read More

Internet marketers are always looking for animation JavaScripts like this one Are you looking for a way to add advertising to your web page that will get your visitor's attention? With ... Read More

You don't need to define separate fields for similar items in JavaScript, you can make them an array instead. Arrays are the most commonly used of the types of object built ... Read More

A somewhat different memory game where the images to be matched are different The basic memory game where you match identical images to one another tests your memory but doesn't really ... Read More

Some characters have special meanings There are a number of characters that have special meanings when they appear in web addresses. Those characters may also be needed as a part of ... Read More

Regular Expressions capture a lot of information about your text in a number of properties When you process a Regular Expression it can not only update the text string that you ... Read More

JavaScript can emulate some of the functionality provided by the browser toolbars and menu. Using a little JavaScript you can add a back button or link within your web page that ... Read More

Scripts that require massive resources will only run in some browsers Some animation JavaScripts involve the movement of dozens or even hundreds of objects around the page. The different browsers can ... Read More

You can use functions in JavaScript When you first start writing programs in any language there is a lot of terminology and functionality that may not be all that obvious to ... Read More

Objects are central to modern JavaScript In earlier tutorials in the ""Learn Modern JavaScript" series I have mentioned objects on a number of occasions. In this eleventh tutorial we look at ... Read More

There are some simple steps to follow if your JavaScript doesn't work. There are a number of different reasons why a script might not work and so the first thing you ... Read More

Unobtrusive JavaScripts can do everything that older more obtrusive JavaScripts can. This rewrite of the version of my memory game using images makes the script as unobtrusive as it can be. ... Read More

There is more than one way to define a regular expression in JavaScript Regular expressions are actually instances of RegExp objects at the nineteenth tutorial in the Regular Expressions series explains. The ... Read More

Separating your JavaScript completely from the HTML is relatively simple. Adding JavaScript to your web page in an unobtrusive way means placing all the JavaScript in a separate file. This version ... Read More

Tell your visitors how long to a specific date and time using JavaScript Display a countdown on your web page. This one is slightly different from the usual JavaScript countdown because ... Read More

JavaScript doesn't supply all the date methods we are likely to need but we can easily add the missing ones ourselves When you are displaying a date, the day of the ... Read More