互動式網頁程式技巧

操作以下這個網頁
web personalization 網頁個人化
你會不會覺得有點神奇, 它是如何做到的?
關鍵就在 DOM.

With the DOM scripting methods you can:

- Create new elements on the fly.
- Grab all the tags of the document, or grab the text without grabbing the tag text.
- Insert new text, and change or remove text from any element.
- Move whole parts of the document around, or remove parts as fragments and work with them.
- And the best part: all of these new methods should work in any DOM compliant browser. No more browser sniffing. No need to build different versions of the same page for different browsers.

Reference:
Scripting For The 6.0 Browsers, By Scott Andrew LePera

createElement() allows you to create a new tag.

myImg = document.createElement("IMG")

Give definition.

DOM (Document Object Model)

In the above example, our newly born tag has no ID, no SRC and no home in the document yet. So let's give it some definition:

myImg.setAttribute("id","imageOne")
myImg.setAttribute("src","jabberwocky.gif")

Append it within the document "tree".

Now all we need to do is append it to the document body. And to do that, we use the DOM node method appendChild():

docBody = document.getElementsByTagName("body").item(0)
docBody.appendChild(myImg)

references:

AJAX by Jeremy Keith