Lab 24 Drag-and-Drop by AJAX

1. Go to Laszlo and enter (Laszlo in 10 minutes).
2. Study and play around the "drag-and-drop" example.
3. Use this method to control movie playing as in the previous lab.
4. If you drag and drop the photo to the "play" area, the movie plays.
5. If you drap and drop the photo to the "pause" area, the movie pauses.

Lab 23 Movie Player by AJAX

1. Go to Laszlo and enter (Laszlo in 10 minutes).
2. Study and play around the "scripting" and "video" examples.
3. Use this script to control movie playing.
4. If you push the "pause" button, the movie pauses.
5. If you push the "resume" button, the movie resumes.

Homework 12-10-2007

1. List three ways of creating interactive webpages.
2. Lab DOM and Javascript.
3. Reading Assignments: AJAX by Jeremy Keith

AJAX

A New Approach to Web Applications Jesse Garrett
AJAX 簡介 Brett McLaughlin

AJAX examples and counterexamples

Lab 22 DOM and JavaScript

1. Open NVu
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 21 Create Img using DOM

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

Hint: The javascript code should be enclosed by script tags.
Reference: DOM (Document Object Model)
Reference:
Scripting For The 6.0 Browsers, By Scott Andrew LePera

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