Make a Select Form Field Required
When adding a form rule for select (or multiple select) fields, these need to be applied on the client side (not server side).
Here’s an example of how to add a rule for a select field:
$mform->addRule(
'selectfield',
get_string("selectfieldrequiredmessage", "local_yourplugin"),
'required',
'',
'client'
);
The key is the 5th parameter above which is set to client instead of the default of server.
For more help, see the Moodle Forms Library Documentation
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