Data Binding"

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{{Deprecated | url=[http://books.zkoss.org/zk-mvvm-book/8.0/syntax/data_binding.html zk-mvvm-book/8.0/syntax/data_binding]|}}
  
  
In the following sections, we'll cover syntax of all ZK Bind's annotations used on a ZUL. They are all used in '''component's attribute''' and have similar format:
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In the following sections, we'll cover ZK Bind's annotations used on a ZUL. They are all used in '''component's attribute''' and have general format described in [[ZK_Developer%27s_Reference/Annotations/Annotate_in_ZUML| Annotate in ZUML]]:
  
Basically, the syntax consists of an annotation with comma-separated key-value pairs. The binder treats value of a key as an EL expression, and sets an EL expression without a key to default key's value. All annotations requires at least default key's value.
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'''@AnnotationName(''attr-value1, attr-name2=attr-value2'')'''
  
* '''<tt>@</tt>''[AnnotationName]''<tt>( </tt> ''[EvaluateOnce EL-expression]''  <tt>) </tt> '''
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'''@AnnotationName(''attr-name1={attr-value1-1, attr-value1-2}, attr-name2=attr-value2'')'''
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Basically, the syntax consists of an annotation name with comma-separated key-value pairs. The binder treats an annotation's attribute value as an EL expression, and sets an EL expression without a attribute name to default attribute name "value". All annotations must define default attribute's value.
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For each ZK Bind supported annotation, the way a binder evaluates an EL expression is slightly different. Some annotation's EL expressions are evaluated only once like <code>@id</code> and <code>@init</code>. some annotations have reserved attribute names, "before" and "after", like <code>@load</code> and <code>@save</code>.
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* '''<code>@</code>''[AnnotationName]''<code>(</code> ''[EvaluateOnce EL-expression]''  <code>)</code> '''
  
 
;''[AnnotationName]''  
 
;''[AnnotationName]''  
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* '''<tt>@</tt>''[AnnotationName]''<tt>( </tt> ''[EL-expression]''  <tt>) </tt> '''
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* '''<code>@</code>''[AnnotationName]''<code>(</code> ''[EL-expression]''  <code>)</code> '''
  
 
;''[AnnotationName]''  
 
;''[AnnotationName]''  
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;''[EL-expression]''  
 
;''[EL-expression]''  
:It could be any ZK allowed EL expression (an internal link to EL) without <tt> ${ } </tt> enclosed.
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:It could be any ZK allowed EL expression (an internal link to EL) without <code>${ }</code> enclosed.
  
  
  
  
* '''<tt>@</tt>''[AnnotationName]''<tt>( </tt> ''[EL-expression], [conditionKeyword]=[EvaluateOnce EL-expression]''  <tt>) </tt> '''
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* '''<code>@</code>''[AnnotationName]''<code>(</code> ''[EL-expression], [conditionKeyword]=[EvaluateOnce EL-expression]''  <code>)</code> '''
  
 
;''[AnnotationName]''  
 
;''[AnnotationName]''  
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;''[EvaluateOnce EL-expression]''
 
;''[EvaluateOnce EL-expression]''
 
: The evaluation result must be one or more command name.
 
: The evaluation result must be one or more command name.
: Command name must correspond to the name specified in Java annotation <tt> @Command </tt> in a ViewModel.
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: Command name must correspond to the name specified in Java annotation <code>@Command</code> in a ViewModel.
  
  
  
  
* '''<tt>@</tt>''[AnnotationName]''<tt>( </tt> ''[EL-expression], [arbitraryKey]=[EL-expression]''  <tt>) </tt> '''
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* '''<code>@</code>''[AnnotationName]''<code>(</code> ''[EL-expression], [arbitraryKey]=[EL-expression]''  <code>)</code> '''
  
 
;''[AnnotationName]''  
 
;''[AnnotationName]''  
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: It could be any name, it's used as a key for parameter related Java annotation in a ViewModel.
 
: It could be any name, it's used as a key for parameter related Java annotation in a ViewModel.
  
 
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Latest revision as of 15:05, 12 January 2022

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


In the following sections, we'll cover ZK Bind's annotations used on a ZUL. They are all used in component's attribute and have general format described in Annotate in ZUML:

@AnnotationName(attr-value1, attr-name2=attr-value2)

@AnnotationName(attr-name1={attr-value1-1, attr-value1-2}, attr-name2=attr-value2)

Basically, the syntax consists of an annotation name with comma-separated key-value pairs. The binder treats an annotation's attribute value as an EL expression, and sets an EL expression without a attribute name to default attribute name "value". All annotations must define default attribute's value.

For each ZK Bind supported annotation, the way a binder evaluates an EL expression is slightly different. Some annotation's EL expressions are evaluated only once like @id and @init. some annotations have reserved attribute names, "before" and "after", like @load and @save.



Subsections:



Last Update : 2022/01/12

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