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

This article is out of date, please refer to zk-mvvm-book/8.0/syntax/data_binding/validator for more up to date information.

Syntax

@validator( [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 validator to validate data when saving to ViewModel.

The evaluation result of EL expression should be a Validator object. You can append arbitrary arguments in key-value pair with comma separated to pass it to the Validator object. Built-in Validator 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 validator named beanValidator

<window id="win" apply="org.zkoss.bind.BindComposer" viewModel="@id('vm') @init(foo.MyViewModel)">
    <textbox value="@bind(vm.user.lastName) @validator('beanValidator')" />
</window>

Use custom validator

<datebox id="cdbox" value="@bind(fx.creationDate) @validator(vm.creationDateValidator)"/>

Version History

Version	Date	Content
6.0.0	February 2012	The MVVM was introduced.