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Revision as of 06:46, 21 December 2023
Script
Employment/Purpose
The script component is used to specify the script codes running at the browser. Notice that, unlike zscript, the script codes are running at the browser. They are usually written in JavaScript which is supported by the most of browsers. The simplest format is as follows.
Example
<window id="win">
<button label="change color" onClick='Clients.evalJavaScript("myfunc()")' />
</window>
<script type="text/javascript">
function myfunc() {
jq("$win").css("backgroundColor", "blue");
}
</script>
Defer the Evaluation
By default, the specified JavaScript code will be evaluated as soon as the page is loaded. By specifying defer="true", the JavaScript code won't be evaluated until all ZK widgets are created and bound to the DOM tree.
<textbox id="inp"/>
<script defer="true">
this.$f("inp").setValue("initialized");
</script>
The defer attribute can be used with a JavaScript file as shown below. Then, the JavaScript file will be loaded after all widgets are created and bound to the DOM tree.
<syntax lang="xml"> <script src="/js/foo.js" defer="true"/> </syntax>
This is required if the script to load intends to manipulate a ZK widget's DOM elements
Alternatives
script directive
Instead of using the script component, you could use the script directive instead. It does not support defer, but it is more efficient since no component is created.
<?script src="~./js/zk.debug.wpd"?>
<?script content="jq.IE6_ALPHAFIX='.png';"?>
where the first statement loads the debug utility and the second generates a JavaScript code snippet directly.
HTML script tag
Another alternative is the HTML SCRIPT tag. For example, we could define global variables and functions as follows
<n:script xmlns:n="native"><!-- use the native namespace -->
var a_global_variable;
function a_global_function () {
alert("native script");
}
alert("you can not access this as widget but evaluated immediately");
</n:script>
Supported Events
| None | None |
- Inherited Supported Events: AbstractComponent
Supported Children
*NONE
Use Cases
| Version | Description | Example Location |
|---|---|---|
| 5.0 | Overview and Tutorial | Client Side Programming |