EntityRef - Dynamically update parameters?

[lee.gooding]

I have 2 entityRefs on the same page. I have the user select a value from one entityRef. I want to get the resulting ID from that selection and feed it into the following entityRef with the "thisDC" variable. The problem is that that value seems to be static and does not read the new value that I set on the variable. Is there any way to do this?

$('[name=field_selectSG]').crmEntityRef({
        entity: 'group',
      api: {
          params: {
              //contact_type: 'Individual',
              parents: thisDC // dc id
          }},
      create: false   
    });

[Coleman Watts]

I'm surprised that code doesn't work.
But here's how we do it in the relationship form (dynamically switching available contact types based on chosen relationship type):
https://github.com/civicrm/civicrm-core/blob/master/templates/CRM/Contact/Form/Relationship.tpl#L182
Note setting data('api-params') and you might want to take a cue from there and also clear the value and trigger change since the user might have previously selected a now-illegal value.

[Coleman Watts]

One more suggestion - I don't know if you noticed our "events" entityRef fields (check it out on the "Register Event Participant" form) we set the 'minimumInputLength' to 0 which causes it to open immediately instead of waiting for search input. This might be a nice touch for your groups selector too.

[lee.gooding]

Excellent. I'll look into how you do it in the relationship form. I think I see what you are doing there.

I was just thinking about how nice it would be to have the entityRef show the list without having to type anything. Thanks for that foresight!