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.

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.

Adding A Row

To add a row to a table we need to not only add the tr tag but also all of the cells in the row. The table DOM methods make this as easy to do as deleting columns.

Deleting A Column

While deleting a row from a table is relatively easy, deleting a column from a table is somewhat harder since you need to remove each cell separately. It isn’t all that much harder though as this example demonstrates.

Table Cells

All rows of a table are made up of cells. These cells have the same relationship to the row that contains them as the rows do to the thead, tfoot, and tbody tags that contain them and so the cells can be accessed the same way that the rows can. The one significant difference with […]

Deleting A Row

Now that we have looked at the properties that allow access to most of the component parts of a table, we can move on to some of the table specific methods that are available. The simplest will delete a row from the table.

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