Add reveling field support for settings

HFP-495

js/h5p-display-options.js

@@ -16,8 +16,39 @@
     toggle();
   }
 
+  function setupRevealing() {
+    var $button = $(this);
+
+    // Getting the field which should have the value:
+    var $input = $('#' + $button.data('control'));
+
+    if (!$input.data('value')) {
+      $button.remove();
+      return;
+    }
+
+    // Setup button action
+    var revealed = false;
+    var text = $button.html();
+    $button.click(function () {
+      if (revealed) {
+        $input.val('');
+        $button.html(text);
+        revealed = false;
+      }
+      else {
+        $input.val($input.data('value'));
+        $button.html($button.data('hide'));
+        revealed = true;
+      }
+    });
+  }
+
   $(document).ready(function () {
     // Get the checkboxes making other fields being hidden:
     $('.h5p-visibility-toggler').each(setupHiding);
+
+    // Get the buttons making other fields have hidden values:
+    $('.h5p-reveal-value').each(setupRevealing);
   });
 })(H5P.jQuery);