Hi,
You can follow the steps given in the following link for a custom listener in the multifield:
http://experience-aem.blogspot.in/2017/12/aem-63-sample-coral-3-multifield-item-listener.html
We have followed the same approach, only changing the JS to something simpler, and it is working for multifield node in AEM 6.3 . This is the JS that we used, where "name" should be the value of the 'name' property given to your node:
(function($, $document) {
"use strict";
$document.on("dialog-ready", function() {
alert("ready");
document.querySelector('input.coral-Form-field.coral-Textfield[name="./multititle"]').setAttribute("value", "this is value");
});
})($, $(document));
For implementing listeners for events like page refresh on component edit you can follow the steps provided in the link below:
https://helpx.adobe.com/experience-manager/kb/RefreshPageWhenModifyDialog.html
This has also been checked for a multifield and is working fine.
Incase you are still facing the issue, please share the listener file that you are using and the multifield package.
Hope this helps!
TechAspect Solutions