UIX, TableProxy, and checkboxes

Question

Hi all,
I've got a column in a UIX table filled with checkboxes. I want to put a checkbox in the column header, and write some Javascript so that when the header checkbox is checked or cleared, all the checkboxes under it are checked or cleared too. Here's the relevant snippet of my UIX source:
<columnHeader>
<stackLayout>
  <contents>
   <sortableHeader text="Remove"/>
   <messageCheckBox name = "selectAll"
    required="no"
    checked="false"
    onClick="javascript:selectAllForDeletion(checked)"
   />
  </contents>
</stackLayout>
</columnHeader>
<contents>
<messageCheckBox
  id="${ui:concat('Criteria:SelectedForDeletion:',uix.current.tableIndex)}"
  required="no"
  model="${uix.current.CriteriaSelectedForDeletion}"
  name="SelectedForDeletion"
  checked="${uix.current.CriteriaSelectedForDeletion==''}"
  prompt="Remove"
  value=""
/>
<formValue name="SelectedForDeletion" value=""/>
</contents> And my relevant Javascript function is
function selectAllForDeletion(selectAll)
  var proxy = new TableProxy('Criteria');
  var rowCount = proxy.getLength();
  for (var i=0; i<rowCount;i++)
    proxy.getFormElement('SelectedForDeletion', i).checked = selectAll;
} But this isn't working--I'm not getting an error; just nothing happenning.
I tried putting an
alert(proxy.getFormElement('SelectedForDeletion', i).checked);before explicitly setting it, and it came out "undefined", which makes me think that
proxy.getFormElement('SelectedForDeletion', i)is not in fact returning the checkbox.
I'd greatly appreciate any help you can provide.
Thanks much,
Avrom

Answer 1

Perhaps the problem might be that your messageCheckbox and your formValue both have the same name. So your javascript might be trying to select the wrong form element.
Also the table has built-in support for "selecting and acting". You can turn this on my specifying multipleSelection for the table bean's tableSelection property. A column of checkboxes are rendered and are wired up automatically to button(s). If this suits your needs, this is a much easier way to go.