@converter"
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=Syntax= | =Syntax= | ||
| − | < | + | <code>@converter(</code> ''[EL-expression], [arbitraryKey]=[EL-expression] '' <code>)</code> |
= Description = | = Description = | ||
'''Target Attribute:''' any (except viewModel, validationMessages, form, and event attributes) | '''Target Attribute:''' any (except viewModel, validationMessages, form, and event attributes) | ||
| − | '''Purpose:''' It should be used with < | + | '''Purpose:''' It should be used with <code>@bind</code>, <code>@load</code>, <code>@save</code>. It applies a converter to convert data during transformation between UI components and ViewModel. |
The evaluation result of EL expression should be a <javadoc> org.zkoss.bind.Converter </javadoc> object. You can append arbitrary arguments in key-value pair with comma separated to pass it to the Converter object. Built-in Converter is referenced by a string literal as its name. | The evaluation result of EL expression should be a <javadoc> org.zkoss.bind.Converter </javadoc> object. You can append arbitrary arguments in key-value pair with comma separated to pass it to the Converter object. Built-in Converter is referenced by a string literal as its name. | ||
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=Version History= | =Version History= | ||
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{| class='wikitable' | width="100%" | {| class='wikitable' | width="100%" | ||
! Version !! Date !! Content | ! Version !! Date !! Content | ||
Latest revision as of 07:35, 8 July 2022
This article is out of date, please refer to zk-mvvm-book/8.0/syntax/data_binding/converter for more up to date information.
Syntax
@converter( [EL-expression], [arbitraryKey]=[EL-expression] )
Description
Target Attribute: any (except viewModel, validationMessages, form, and event attributes)
Purpose: It should be used with @bind, @load, @save. It applies a converter to convert data during transformation between UI components and ViewModel.
The evaluation result of EL expression should be a Converter object. You can append arbitrary arguments in key-value pair with comma separated to pass it to the Converter object. Built-in Converter is referenced by a string literal as its name.
- [arbitraryKey]=[EL-expression]
- It's key-value pairs basically. You can write multiple key-value pairs with different key names.
- An EL expression without key is set to a default key named "value" implicitly.
- Due to each annotation has different functions, some annotations may ignore key-value pair expression other than default key, e.g.@id.
- [arbitraryKey]
- It could be any name, it's used as a key for parameter related Java annotation in a ViewModel.
Example
Use built-in converter named formatedNumber
<label value="@load(item.price) @converter('formatedNumber', format='###,##0.00')"/>
Use custom converter
<label value="@load(vm.selected.totalPrice) @converter(vm.totalPriceConverter)"/>
Version History
| Version | Date | Content |
|---|---|---|
| 6.0.0 | February 2012 | The MVVM was introduced. |