Slide 11.20: WML selection (cont.)   Slide 11.22: WML tasks (cont.)   Home

WML Tasks

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A task specifies what action to perform when an event, like entering a card or selecting a link, occurs. There are four WML tasks, <go>, <noop>, <prev>, and <refresh>, and they can only be contained in either a <do> or <onevent> element. The <go> task has been introduced. The following will explain the other three tasks.

NOOP Tag
The <noop> tag dictates that no operation should be done. This tag can be used on the card level to prevent an event, specified on the deck level by the <template> element, from occurring. This example uses a <do> tag to add a Back link to the card. When the user clicks on the Back link, he or she should be taken back to the previous card. But the <noop> tag prevents this operation; when the user clicks on the Back link nothing will happen.

^†Note that this example does not work on the TagTag microbrowser.