How can i set the value of sharepoint form field dropdown box(lookupfield) in sharepoint list form when the form gets saved (using jquery) note: the lookupfield (dropdown formfield renders as input if it contains values more than 20)
I just implemented such a solution a couple of weeks ago
Here is a very good post that will explain all.
So I have a field called "Data Classification":
var dataClsField = $('select[title="Data Classification"]');
I was trying to set this field with the value of another dropdown called "DataClass" that I got using this code:
var clsFieldValue = $('select[id*="DataClass"] option:selected').val();
For some crazy reason, I had to do both of these options to get my first field to set right:
dataClsField.find('option[value="'+clsFieldValue+'"]').prop('selected', true); dataClsField.val(clsFieldValue.val());
Note: This was with 2 dropdowns with less than 20 items in each. I believe the only difference, jQuery-wise, when it goes over that, is that "select" becomes "input" on your selector.