Add help button to the header section

classes/bigbluebuttonbn/mod_form_addons.php

@@ -16,7 +16,6 @@
 namespace bbbext_flexurl\bigbluebuttonbn;
 
 use bbbext_flexurl\utils;
-use MoodleQuickForm;
 use stdClass;
 
 /**
@@ -163,9 +162,8 @@ public function definition_after_data() {
      * Add new form field definition
      */
     public function add_fields(): void {
-        global $CFG;
         $this->mform->addElement('header', 'flexurl', get_string('pluginname', 'bbbext_flexurl'));
-
+        $this->mform->addHelpButton('flexurl', 'flexurl', 'bbbext_flexurl');
         $paramcount = optional_param('flexurl_paramcount', $this->bigbluebuttonbndata->flexurl_paramcount ?? 0, PARAM_RAW);
         $paramcount += optional_param('flexurl_addparamgroup', 0, PARAM_RAW) ? 1 : 0;
         $isdeleting = optional_param_array('flexurl_paramdelete', [], PARAM_RAW);
@@ -217,6 +215,7 @@ public function add_fields(): void {
             $this->mform->setType("flexurl_paramvalue[$index]", utils::PARAM_TYPES['paramvalue']);
             $this->mform->setType("flexurl_eventtype[$index]", utils::PARAM_TYPES['eventtype']);
             $this->mform->setType("flexurl_paramdelete[$index]", PARAM_RAW);
+
             $this->mform->registerNoSubmitButton("flexurl_paramdelete[$index]");
         }
         // Add a button to add new param groups.

lang/en/bbbext_flexurl.php

@@ -31,6 +31,9 @@
 $string['event_create'] = 'Create';
 $string['event_join'] = 'Join';
 $string['event_all'] = 'All';
+$string['flexurl_help'] = 'This allows you to add additional parameters to the join/create URL of a BigBlueButton activity.
+So you need first to choose a name for your parameter, then the value of the parameter and finally the event type
+(create, join or both).';
 $string['user_info'] = 'Basic user info (USER)';
 $string['pluginname'] = 'BigBlueButton FlexURL';
 $string['paramgroup'] = 'Parameter';