Difference between revisions of "Remove Options from a Combo Box Using JavaScript"

Revision as of 12:11, 23 October 2009

You can use a JavaScript function to modify the options available in a pull-down box on the page.

The following example removes two different Types available for new Level 2 records (would be useful if you need to define complex criteria for what type of Level 2 records can be created):

function RemoveTypes()
{
var i=0;
var frm = document.forms[0];
// at Level 1 use document.form1 instead of document.forms[0]


if (frm.eventid.value==0)
// Note: this loop starts at the bottom to avoid skipping any due to re-indexing as they are removed.
for (i=frm.eventtype.options.length-1;i>=0;i--)
{
   if (frm.eventtype.options[i].text=='FirstType' || frm.eventtype.options[i].text=='SecondType') 
      frm.eventtype.options[i]=null;
}
}
}
RemoveTypes();

Note: the same syntax can be used at Level 1, replacing document.forms[0] with document.form1

See Also

• Add Options to a Combo Box Using JavaScript