Primefaces p:dialog doesn't always show up if update=“dlg” in commandButton

Question

I have a jsf facelet page like this (extremely simplified version):

Answer 1

Use the oncomplete attribute instead of onsuccess attribute.

<p:commandButton ... update="@form :dlgEdit" oncomplete="_dlgEdit.show()" />

The onsuccess attribute is invoked directly when ajax response is successfully arrived but long before the ajax updates are performed based on the ajax response. The oncomplete attribute is invoked when the ajax updates are successfully completed. See also the tag documentation of <p:commandButton>.

Basically, this is the event invocation order:

• onclick handler is invoked
• ajax request is prepared with form data based on process
• onbegin handler is invoked
• ajax request is sent
• ajax response is successfully retrieved (HTTP status code is 200)
• onsuccess handler is invoked
• ajax updates are performed in HTML DOM based on update
• oncomplete handler is invoked