[ http://issues.apache.org/jira/browse/TAPESTRY-554?page=all ]
     
Howard M. Lewis Ship closed TAPESTRY-554:
-----------------------------------------

    Fix Version: 4.0
     Resolution: Fixed

To make use of this feature, you need to add a little JavaScript:

document.forms.myform.events.invalid_field_handler = function(event, field, 
message)
{
   . . .
}

The event is the FormSubmitEvent
The field is the DOM object for the field being validated
The message is the message to present to the user

> Hook needed on client side to control how validation errors are presented to 
> the user
> -------------------------------------------------------------------------------------
>
>          Key: TAPESTRY-554
>          URL: http://issues.apache.org/jira/browse/TAPESTRY-554
>      Project: Tapestry
>         Type: Improvement
>   Components: Framework
>     Versions: 4.0
>     Reporter: Howard M. Lewis Ship
>     Assignee: Howard M. Lewis Ship
>      Fix For: 4.0

>
> Right now, client-side JavaScript functions such as required() and 
> validate_min_length() invoke a method handle_invalid_field().
> handle_invalid_field() calls window.alert() to display the message, then sets 
> event.abort and event.cancelListeners.
> event.cancelListeners is important, otherwise each invalid field will raise 
> the alert window!
> However, if you can imagine a much more sophisticated scheme, where we use 
> DHTML to update the page and display errors as HTML (rather than a popup 
> window) .... then we need a way to hook handle_invalid_field(), so that we 
> can perform a different operation.
> My first thought was that we could simply provide an overriding 
> implementation of the function ... however, that doesn't handle cases where a 
> page has multiple forms. 
> My thoughts are to add a method to FormSubmitEvent for alterting the user 
> about errors; this would delegate to a function provided by FormEventManager. 
>  This function could be set by a Script's <initilaization> block. 

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