Added comments to javascript code.

website/public/js/groupButtons.js

@@ -3,16 +3,20 @@ function placeGroupButtons() {
         .done(function(data) {
             var $buttonContainer = $("div.group-button-container");
 
+            // Append the right group button to the button container.
+            // When user is not a member
             if(data == 'none') {
                 $buttonContainer.append(
                     "<button class='green group-button' value='request'>" +
                     "<i class='fa fa-plus'></i> Voeg toe" +
                     "</button>");
+                // when user sent a request to become a member.
             } else if(data == 'request') {
                 $buttonContainer.append(
                     "<button class='red group-button' value='none'>" +
                     "<i class='fa fa-times'></i> Trek verzoek in" +
                     "</button>");
+                // When user is a member of the group.
             } else {
                 $buttonContainer.append(
                     "<button class='red group-button' value='none'>" +
@@ -20,6 +24,7 @@ function placeGroupButtons() {
                     "</button>");
             }
 
+            // Gets triggered when a group button is clicked.
             $buttonContainer.children().click(function() {
                 $.post("API/editMembership.php", { grp: groupID, role: this.value })
                     .done(function() {