Introducing JavaScript

JavaScript has changed a great deal since it was first introduced but many sites still use outdated techniques. There are even lots of JavaScript tutorials on the web that show you how JavaScript should be written so that it can work in Netscape 2 rather than so that it will work in modern browsers. As a result there are many people who are writing what they think is JavaScript but where what they are producing is more suited to the 20th Century than to the 21st.

Beginners should work through all the basic examples prior to moving on to the other examples which cover separate aspects of JavaScript in more detail.

Most of the JavaScript examples here will work in IE5+, Opera7+ and all versions of Firefox, Safari and Chrome. Those commands introduced in ECMAScript5.1 in 2011 have been added (if I have missed any please let me know). Those commands introduced in ECMAScript2015 are currently being added (there are lots of them so it may take some time but then most current browsers do not yet support them all anyway). Where these new commands are not supported by IE8 or IE7 that information is included in the text since those two browsers might still have to many users for you to ignore. So few people using other browsers fail to keep their browser up to date that lack of support in older versions of other browsers will not have any significant affect.

There is a link to jsBin at the bottom right of all the pages. This site provides an easy way to test your JavaScript code online without needing to create an entire web page to run a simple test.

Access The Form Itself

We don’t need a name or an id on the form tag itself when defining a form. The server side processing doesn’t use the name of the form, just the names of the individual fields and JavaScript can easily access the form itself from any of the fields contained within it.

Access Form Fields

Moving on from tables to the other part of the web page that has slightly different requirements for the Document Object Model – the form. The easiest way to handle most of your JavaScript to form field interactions is to give the form fields an id each – that way the name can be used […]

Creating Tables

I have seen masses of complicated code involving a huge number of createElement calls used by beginners attempting to create tables from JavaScript but who have not learnt just how simply you can create an entire table in JavaScript by using the table specific properties and methods. The only elements in the entire table where […]

Stripy Tables

While there are CSS3 commands that can apply alternating colours to your table rows, not all browsers currently support those commands. Even once they do this example of how to process an entire table to update selected parts will still be useful as it can be adapted to any task that requires updating the parts […]

Adding A Column

The only difference between adding a row to a table and adding a column is which table element we loop on and that we don’t need to create quite so many tags.

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You are welcome to use any the example JavaScript from this site in the scripts for your site or any that you develop for others but may not use the longer example scripts that contain a copyright notice in any other way without permission.