DropDownChoice with Confirm Dialog

[Marco Di Sabatino Di Diodoro]

Hi all,

I like implement a DropDownChoice with an Confirm Dialog.
I used an AjaxFormComponentUpdatingBehavior("on change") to intercept the 
change in the DropDownChoice. 
In addition,  the user must first confirm the operation with a dialog before 
changing the value in the DropDownChoice. 

To do that I add an AjaxCallListeners:

            @Override
            protected void updateAjaxAttributes(final AjaxRequestAttributes 
attributes) {
                super.updateAjaxAttributes(attributes);
                final AjaxCallListener ajaxCallListener = new 
AjaxCallListener() {
                    private static final long serialVersionUID = 
7160235486520935153L;

                    @Override
                    public CharSequence getPrecondition(final Component 
component) {
                        return "if (confirm('" + getString("confirmDelete") + 
"')) return false;";
                    }  
                };
                attributes.getAjaxCallListeners().add(ajaxCallListener);
            }});

When I click cancel on the Confirm Dialog, the DropDownChoice changes and I can 
not restore the old value. 
How I understand that the user clicked on Cancel? Is the correct way to 
implement this functionality?

Best Regards
M

-- 
Dott. Marco Di Sabatino Di Diodoro
Tel. +39 3939065570

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