wml入门之二 wap网站开发aspxuexi.com
WML 任务
任务指定了当某个事件（比如增加一张“card”或选择了一个链接）发生时，所应执行的行为。
Go Task
<go>任务代表了切换到一张新“card”的行为
<?xml version="1.0"?>
<!DOCTYPE wml PUBLIC "-//WAPFORUM//DTD WML 1.1//EN"
"http://www.wapforum.org/DTD/wml_1.1.xml">
<wml>
<card>
<p>
<anchor>
Go To Test
<go href="test.wml"/>
</anchor>
</p>
</card>
</wml>
Prev Task
<prev>任务代表了回到前张card的行为。
<?xml version="1.0"?>
<!DOCTYPE wml PUBLIC "-//WAPFORUM//DTD WML 1.1//EN"
"http://www.wapforum.org/DTD/wml_1.1.xml">
<wml>
<card>
<p>
<anchor>
Previous Page
<prev/>
</anchor>
</p>
</card>
</wml>
Refresh Task
<refresh>任务更新了一些指定的“card”变量。只要屏幕上出现了这些变量，任务也会更新屏幕。
The example below uses an <anchor> tag to add a "Refresh this page" link to the card. When the user clicks on the link, he or she refreshes the page and the value of the variable x will be set to 30:
<?xml version="1.0"?>
<!DOCTYPE wml PUBLIC "-//WAPFORUM//DTD WML 1.1//EN"
"http://www.wapforum.org/DTD/wml_1.1.xml">
<wml>
<card>
<p>
<anchor>
Refresh this page
<go href="thispage.wml"/>
<refresh>
<setvar name="x" value="30"/>
</refresh>
</anchor>
</p>
</card>
</wml>
Noop Task
<noop>任务指明了不需要做任何操作（noop意思是"no operation"（没有操作)。这个标记用于跳过deck级别（deck-level）的元素。
<do>标记用于在用户点击屏幕上的单词/短语时激活任务。
<noop> tag prevents this operation; when the user clicks on the "Back" link nothing will happen:
<?xml version="1.0"?>
<!DOCTYPE wml PUBLIC "-//WAPFORUM//DTD WML 1.1//EN"
"http://www.wapforum.org/DTD/wml_1.1.xml">
<wml>
<card>
<p>
<do name="back" type="prev" label="Back">
<noop/>
</do>
</p>
</card>
</wml>
Task Elements
| Start tag 始标记 | Purpose 作用 | WML |
|---|---|---|
| <go> |
Represents the action of switching to a new card |
1.1 |
| <noop> |
Says that nothing should be done (noop stands for "no operation"). Used to override deck-level elements |
1.1 |
| <prev> |
Represents the action of going back to the previous card |
1.1 |
| <refresh> | Refreshes some specified card variables. If any of the variables are shown on the screen, this task also refreshes the screen 任务更新了一些指定的“card”变量。只要屏幕上出现了这些变量，任务也会更新屏幕。 |
1 |
WML 计时器
Timer
计时器
WML“card”可通过设置使用WML的计时函数，计时单元是0.1秒
下面的例子会显示一条信息共3秒钟，并且进入文件"test.wml":
<?xml version="1.0"?>
<!DOCTYPE wml PUBLIC "-//WAPFORUM//DTD WML 1.1//EN"
"http://www.wapforum.org/DTD/wml_1.1.xml">
<wml>
<card ontimer="test.wml"><timer value="30"/>
<p>Some Message</p>
</card>
</wml>
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