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  Tutorial: Javascript Introduction to Javascript Beginning Document Object Model Manipulation Part 2 Tutorial

Part two of how to begin manipulating elements on a page on-the-fly using the Document Object Model with Javascript. Covers getting and setting attributes and values.

Tutorial Details:

Beginning DOM Manipulation Part 2 from The Shadow Fox Network

In the last article, we covered how to begin to manipulate page elements using Javascript and the Document Object Model . In this tutorial, we'll cover how to get and set attributes of elements, using the easy DOM conventions , and using getAttribute , and setAttribute .
Let's start with a real-world application of the DOM. Let's try an image gallery. Cliche, yes, but it's good for our purposes. We need some pictures, a few links, and maybe a placeholder.

Very basic. Two pictures that will be thumbnails, and a larger placeholder to be replaced with the pictures later. Now to start getting it DOM ready, let's add an id attribute to the placeholder to be easily accessed, so we'll put: . That'll make it much easier to replace with the image.

The first line of code is the function declaration, which takes one argument, the picture to use. This is followed by a quick compatibility check to make sure our code is accessible to those with javacript off. Then we define a variable, placeholder, to the element with the id of "placeholder", which, if you remember, is our placeholder image. Then we get the location the link will go to in our picture variable. The getAttribute function takes one argument, which is the name of the attribute; it then returns the value of said attribute. Then we set our placeholder picture's src, or source image to the href value of the link, which would have made our browsers go to that location.
Now all you need to do is implement it in the correct way.


 

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