struts validation framework and checkboxes

[rob harvey]

Hi I am using validator framework and am trying to validate a checkbox has been checked - ive tried required and validwhen checking for != null but neither seems to work - any ideas?
cheers

[Zip Ped]

The problem with checkboxes is that if the checkbox is selected or ON then you get the parameter or you dont get anything. One way to work around is to get the parameter from the request, if the parameter is present then the checkbox is selected or if the parameter is absent thenthe checkbox is unchecked. Another way is to use the reset() method of the ActionForm class.

[rob harvey]

i use the rest to reset it to false when need be - how can i access the request parameter in the validator xml? ive tried required as per earlier suggestions but it doesnt seem to work?

[Merrill Higginson]

Try this:

create a JavaScript function that will be called by the onsubmit event of the <html:form> tag.

The function would look something like this:

function fixCheckbox() {
  var box = document.myForm.myCheckBox;
  if (!box.checked) {
      box.value = 'false';
      box.checked = true;
   }
}

This forces the checkbox to return a value of either true or false. you can then use validation not to allow a value of false.