AjaxFallbackButton: inconsistent submit order
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                 Key: WICKET-1894
                 URL: https://issues.apache.org/jira/browse/WICKET-1894
             Project: Wicket
          Issue Type: Bug
          Components: wicket
    Affects Versions: 1.3.5
            Reporter: Stefan Fussenegger
            Priority: Minor


I just stumbled upon a problem with a Form containing a nested Form and two 
AjaxFallbackButtons (submit and preview). I need to implement different 
onSubmit() behavior of the nested Form depending on the clicked button.

The order of onSubmit() calls is:

without JS:
- AjaxFallbackButton.onSubmit(AjaxRequestTarget,Form)
- OuterForm.onSubmit() // not used
- Inner Form.onSubmit()

with JS:
- Inner Form.onSubmit()
- OuterForm.onSubmit() // not used
- AjaxFallbackButton.onSubmit(AjaxRequestTarget,Form)

With JS, it is therefore not possible to determine which button was clicked 
from inside a form's onSubmit() method. 

see also 
http://www.nabble.com/AjaxFallbackButton%3A-inconsistend-submit-order-td20131329.html

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