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Is there a way set it so that a pm is sent with some default message when a form is submitted instead of just linking to the message popup? Using this,
include_once JPATH_ROOT.'/components/com_community/libraries/core.php';
include_once JPATH_ROOT.'/components/com_community/libraries/messaging.php';
// Add a onclick action to any link to send a message
// Here, we assume $usrid contain the id of the user we want to send message to
$onclick = CMessaging::getPopup($userid);
echo '<a onclick="'.$onclick.'" href="#">Send message</a>';