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
Example 1,
The following example removes two different Types available for new Level 2 records (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.frmevent;
// at Level 1 use document.form1 instead of document.frmevent
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();
Example 2,
The following example removes a Branch on Level1 from the Branch drop down list.
function RemoveBranches()
{
var i=0;
var frm=document.form1;
// Note: this loop starts at the bottom to avoid skipping any due to re-indexing as they are removed.
for(i=3;i>=0;i--)
{
if (frm.branchid.options[i].value=='448060')
//448060 is a Branch id
frm.branchid.remove(i);
}
}
RemoveBranches();
Example 3,
The following example also removes Branches on Level1 from the Branch drop down list.
function RemoveBranches()
{
var i=0;
var frm=document.form1;
if(frm){
// Note: this loop starts at the bottom to avoid skipping any due to re-indexing as they are removed.
for(i=(frm.branchid.options.length-1);i>=0;i--){
if (frm.branchid.options[i].value!=1111 && frm.branchid.options[i].value!=2222 && frm.branchid.options[i].value!=3333 &&frm.branchid.options[i].value!=4444){
frm.branchid.remove(i);
}
}
}
}
RemoveBranches();
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 listed in the user's 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;
}
}
