Thank you very much Justinas.
Santosh Chouhan
On Sat, Nov 29, 2008 at 6:20 PM, Justinas <[EMAIL PROTECTED]> wrote:
> santosh chouhan wrote:
>
>> Hello Justinas,
>> Which one is called first , is there any case possible where Ui component
>> can directly connect to model bean . please any one give the exactly
>> scenario of beans when they come in action.
>>
> First called is backingbean. Then bb does some logic, and calls model.
> To call model method directly from UI component is bad, because, during
> page rendering very often bindings are called more than once. You could see
> that in effect when you put system.out.println("sometext") in BB setter or
> getter method!
> Backing beans are helpers, temp value storage for UI component or group of
> them. They take data from Model beans.
>
> Usually I put BB in request scope, and in constructor I initialize it using
> calls to Model classes according to request parameters. In that way, model
> beans are called once per request and backing bean hold values as long as it
> takes to render page.
>
>> From which beans i get my form attribute , please make me clear all step
>>
> h:dataTable value="#{myBB.dataModel}"
>
> BB:
> private DataModel dataModel;
> constructor:
> this.dataModel = new
> ListDataModel(MyModel.getItemList(Contexts.getRequestParam('parent_id'));
>
> where Contexts.getRequestParam is helper function to extract post/get
> parameter from HttpRequest.
> MyModel.getItemList() - static method, returning List of items. It
> encapsulates required SQL and so on.)
>
> hope that clears things up!
>
> Justinas
>
