DOM, Document Object Model

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.

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)

Lab 32: DOM

1. Open KompoZer
2. Based on the code as in

http://www.scottandrew.com/weblog/articles/dom_4 ,
write a code to generate the table of 9*9 products. (九九乘法表)

Hint: The javascript code should be enclosed by script tags.

Lab 31: Create Image using DOM

1. Open KompoZer
2. Hand code a javascript that loads an image from Internet based on
the DOM model.
3. Take a look at the sample code that shows how window.onload to load the image.
4. Use a button to load the image. Try how onclick works.

Static, Dynamic Webpages and Common Gateway

• Dynamic pages, content generated by server-side programs.
  
• CGI, Common Gateway Interface, for sending requests to server-side programs.
  

static page
Ex:
http://www.google.com/

dynamic page
Ex:
http://www.cna.com.tw/

URL that sends a request by CGI
Ex:
http://maps.google.com/maps?q=24.9586,+121.2411

Lab 30 navigation bar

1. 進入你的部落格，登入，選擇自訂
2. 新增小工具
3. 選取
HTML/JavaScript
4. 撰寫或貼上所需連結(範例)

Lab 29 Hand code a form

Hand code a HTML or use KompoZer to edit an HTML so that the webpage can send a request to Google like
http://maps.google.com/maps?q=24.9586,+121.24114

Use Form CGI that includes action, input, and submit.
Try a few different coordinates.

Lab 28 Lab Form and Action

• Dynamic pages, content generated by server-side programs.
  
• CGI, Common Gateway Interface, for sending requests to server-side programs.
  

static page
Ex:
http://www.google.com/

dynamic page
Ex:
http://www.cna.com.tw/

URL that sends a request by CGI
Ex:
http://maps.google.com/maps?q=24.9586,+121.2411

"logic will get you from A to B - imagination will take you anywhere"

How to use Form to invoke a remote service through CGI.

1. Copy the search box of this search page,
inlcuding radio buttons, text input, and submit button.
2. Open your KompoZer HTML editor.
3. Open a new empty HTML file.
4. Paste the search box into this new file.

5. Use KompoZer to add a Form to this search box. Do not hand code the HTML. Just fill the blank in the Form dialog.

6. In the form dialog, set Action="http://google.com/search" and name of Form as "f" and method as "get"
(See Hint if it does not work.)
7. Save your file on your computer. Run your HTML by Firefox. What do you get?

8. Set method as "post"
9. Run your HTML by Firefox. What do you get?