allow to send more fields when saving ajax-drafts

Plugins may want to add further fields to be present when saving drafts

lib/scripts/locktimer.js

@@ -8,6 +8,12 @@ var dw_locktimer = {
     lasttime: null,
     msg: LANG.willexpire,
     pageid: '',
+    fieldsToSaveAsDraft: [
+        'input[name=prefix]',
+        'textarea[name=wikitext]',
+        'input[name=suffix]',
+        'input[name=date]',
+    ],
 
     /**
      * Initialize the lock timer
@@ -42,6 +48,13 @@ var dw_locktimer = {
         dw_locktimer.reset();
     },
 
+    /**
+     * Add another field of the editform to be posted to the server when a draft is saved
+     */
+    addField: function(selector) {
+        dw_locktimer.fieldsToSaveAsDraft.push(selector);
+    },
+
     /**
      * (Re)start the warning timer
      */
@@ -84,10 +97,7 @@ var dw_locktimer = {
 
         // POST everything necessary for draft saving
         if(dw_locktimer.draft && jQuery('#dw__editform').find('textarea[name=wikitext]').length > 0){
-            params += jQuery('#dw__editform').find('input[name=prefix], ' +
-                                                   'textarea[name=wikitext], ' +
-                                                   'input[name=suffix], ' +
-                                                   'input[name=date]').serialize();
+            params += jQuery('#dw__editform').find(dw_locktimer.fieldsToSaveAsDraft.join(', ')).serialize();
         }
 
         jQuery.post(