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+ (provided you use a deprecated MIME type - otherwise IE9 through 11 only), Opera7+ and all versions of Firefox, Safari, Vivaldi 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 and ECMAScript2016 are currently being added (there are lots of them for 2015 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 that information is included in the text - just in case you still have lots of people using that long unsupported browser. So few people using other browsers fail to keep their browser up to date that lack of support in older versions of other browsers should 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.

Simplifying Creates

One thing that you will have noticed about the Document Object Model calls for creating new content to insert into the page is that it involves several commands in order to construct the new content to be added. In many cases you will have a number of similar pieces of content that need to be […]

Move Node

Removing an element from one spot in the web page and inserting it in another is extremely simple in JavaScript. All it takes is one command to move the element to its new location.

Replace A Node

we have looked at how to delete nodes from the web page and also how to add new nodes into the web page. The replaceNode command allows you to do both types of update simultaneously.

Add Before The Current Node

The second and slightly more complicated way to add new content into the web page is used where you want to add the new content at the same level as existing content where you know the node that you want to insert the content before.

Add A Child Node

There are two ways you can add the nodes that you have built into the actual web page. The easier of the two is where you want to add the new content as a child of something already in the page where you can use the same appendChild command you used for combining the nodes […]

This site is © copyright Stephen Chapman - Felgall Pty Ltd 2011-2016.

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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.