@Default"
From Documentation
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=Syntax= | =Syntax= | ||
Revision as of 08:04, 28 May 2015
This article is out of date, please refer to zk-mvvm-book/8.0/syntax/viewmodel/parameters/default for more up to date information.
Syntax
@Default("defaultValue")
Description
Target: A method's parameter (for initial and command methods)
Purpose: Assign a binding parameter's default value when it's null.
You give annotation element's value with a String, and ZK will cast to the corresponding type of the parameter. You can apply this annotation after other parameter related annotation e.g., @BindingParam. If a parameter retrieved by first annotation is null, it uses the default value specified in this annotation.
Example
Pass parameter from a zul
<button id="first" onClick="@command('cmd', arg2=100)" />
<button id="second" onClick="@command('cmd')" />
Example to assign default value
@Command
public void cmd(@Default("false") Boolean arg1, @BindingParam("arg2") @Default("3") Integer arg2){
//...
}
- According to above example, if we click first button, binder will pass 100 to arg2. If we click second button, arg2 will be 3.
Version History
| Version | Date | Content |
|---|---|---|
| 6.0.0 | February 2012 | The MVVM was introduced. |