@Default"
From Documentation
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{{ZKDevelopersReferencePageHeader}} | {{ZKDevelopersReferencePageHeader}} | ||
| + | {{Deprecated | url=[http://books.zkoss.org/zk-mvvm-book/8.0/syntax/default.html zk-mvvm-book/8.0/syntax/viewmodel/parameters/default]|}} | ||
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=Syntax= | =Syntax= | ||
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= Description = | = Description = | ||
| − | '''Target:''' A method's parameter (initial | + | '''Target:''' A method's parameter (for initial and command methods) |
'''Purpose:''' Assign a binding parameter's default value when it's null. | '''Purpose:''' Assign a binding parameter's default value when it's null. | ||
| − | You give annotation element's value with 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. | + | 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 = | = Example = | ||
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@Command | @Command | ||
| − | public void cmd(@Default("false") Boolean arg1, @BindingParam(" | + | public void cmd(@Default("false") Boolean arg1, @BindingParam("arg2") @Default("3") Integer arg2){ |
//... | //... | ||
} | } | ||
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* According to above example, if we click first button, binder will pass 100 to arg2. If we click second button, arg2 will be 3. | * 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= | ||
| − | + | {| class='wikitable' | width="100%" | |
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! Version !! Date !! Content | ! Version !! Date !! Content | ||
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Latest revision as of 07:36, 8 July 2022
This article is out of date, please refer to zk-mvvm-book/8.0/syntax/viewmodel/parameters/default for more up to date information.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. |