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

Revision as of 18:46, 28 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();

If you wish to control this by role (for example if you want a role to be able to view existing Level 2 FirstType Type records, but not create them... Include this in the variable section at the top of the script:

var myrolelist="@me.rolelist@";

And replace or include the following in the if logic section:

if (myrolelist.indexOf(",1234,")>=0)

Note that you must test for greater than or equal to 0. If the role is the first on listed in the users role list it will return a 0 rather than a 1 because of the preceding comma.

See Also

• Add Options to a Combo Box Using JavaScript