Remove Options from a Combo Box Using JavaScript
You can use a JavaScript function to modify the options available in a pull-down box on the page.
Remove One or More Options
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 records of a given Type, 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.
To Remove All Options Except the Selected
- The following script will prevent users from changing the Level 2 Type once the record has been saved:
// For existing Types remove all options from the Type field (except the selected) so it can't be changed
if (frm.eventid.value!=0)
{
for (i=frm.eventtype.options.length-1;i>=0;i--)
{
if (frm.eventtype.options[i].value!=frm.eventtype.value)
frm.eventtype.options[i]=null;
}
}