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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 (would be useful if you need to define complex criteria for what type of Level 2 records can be created):
<pre>
function RemoveTypes(){
var i=0;
var frm = document.forms[0]frmevent;// at Level 1 use document.form1 instead of document.forms[0]frmevent
</pre>
''Example 2,''
The following example removes a Branch on '''Level1''' from the Branch drop down list.
<pre>
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();
</pre>
''Example 3,''
The following example also removes Branches on '''Level1''' from the Branch drop down list.
<pre> 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(); </pre> If you wish to control this by [[Role|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:
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 [[User|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:<pre> // 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; } }</pre>
==See Also==
* [[Add Options to a Combo Box Using JavaScript]]
* [[Conditional Lists of Values]]
[[Category:JavaScript]]