Re: onsubmit checkbox submission

On 31 Jan 2006, at 16:17, John Pollard wrote:

> I would like to update a WO page when a check box is ticked/unticked.
>
> I have placed a WOCheckBox within a WOForm.
>
> The WOCheckBox has onclick="this.form.submit()" and checked set to  
> myVar
> and the WOForm has action set to a callback method myCB
>
> What I see is that setMyVar is only called when the check box is  
> ticked, but not when it is unticked.
>
> The myCB for the form is called for both ticks and unticks, but  
> then this isn't passed the state of the check box
>
> I can add some convoluted logic to work out the fact that the user  
> has unticked (the fact that myCB is called without setMyVar having  
> been called in the same cycle), but there must be a better solution?
>
> Thanks
> John

http://www.blooberry.com/indexdot/html/tagpages/i/inputcheck.htm

"CHECKBOX is a TYPE attribute value to the INPUT element for FORMs.  
It  indicates a form field used for a boolean choice, or for  
attributes that  can take multiple values at the same time. The  
default state for a  checkbox is OFF. Only checkboxes that are in a  
checked state should be  submitted to the form processing script."

The cheat I'd use in this situation is an <INPUT TYPE=HIDDEN>, which  
gets tweaked by a javascript onChange handler attached to the <INPUT  
TYPE=CHECKBOX>.

Although having reviewed the discussion of WOcheckBox's bindings at  
http://developer.apple.com/documentation/WebObjects/Reference/ 
DynamicElements/WOCheckBox/chapter_7_section_3.html , I don't see why  
your logic needs to be convoluted if you shadow 'myVar' with an ivar  
'myVarChecked'.

-- Patrick