Setting default value of non-custom activity field AFTER type is selected

[demeritcowboy]

Might just be having a mental block as to how to do this but I want to set the default value of assignee but only for a certain type of activity. When the person chooses New Activity, the type isn't selected yet, so I can't set it during buildForm at that point. If I wait until they choose the type, then when buildForm is called (via ajax) the only fields in "scope" are the custom fields associated with that type.

Am I missing an obvious hook?

[lolas]

I would use buildForm to add a JavaScript resource:
http://wiki.civicrm.org/confluence/display/CRMDOC/Resource+Reference

In your js file you should be able to use JQuery to react to the Activity type selection and set the field defaults at that time. http://wiki.civicrm.org/confluence/display/CRMDOC/Javascript+Reference What might be tricky is triggering the the Ajax lookup for contacts on the assignee field?

If that doesn't work you should be able to at least clear the field and freeze it for editing. Then you can set the value in hook_civicrm_postprocess.

[demeritcowboy]

Thanks for the response. What I've done in the meantime is hacked activity.tpl to add some stuff after buildCustomData, but maybe I can add something as you describe to monitor the change event in the activity type dropdown.