ZK Developer's Reference/MVVM/Syntax/Data Binding/@converter

Syntax

@converter( [EL-expression], [arbitraryKey]=[EL-expression] )

Description

Target Attribute: any (except viewModel, validationMessages, form, and even 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)"/>