Finish implementing titleFrom option for Repeaters

Ref: e7609aa5e8

modules/backend/formwidgets/Repeater.php

@@ -31,6 +31,11 @@ class Repeater extends FormWidgetBase
      */
     public $sortable = false;
 
+    /**
+     * @var string Field name to use for the title of collapsed items
+     */
+    public $titleFrom = false;
+
     /**
      * @var int Maximum repeated items allowable.
      */
@@ -88,6 +93,7 @@ class Repeater extends FormWidgetBase
             'form',
             'prompt',
             'sortable',
+            'titleFrom',
             'maxItems',
         ]);
 
@@ -125,7 +131,7 @@ class Repeater extends FormWidgetBase
         if (!self::$onAddItemCalled) {
             $this->processExistingItems();
         }
-        
+
         if ($this->previewMode) {
             foreach ($this->formWidgets as $widget) {
                 $widget->previewMode = true;
@@ -137,6 +143,7 @@ class Repeater extends FormWidgetBase
 
         $this->vars['prompt'] = $this->prompt;
         $this->vars['formWidgets'] = $this->formWidgets;
+        $this->vars['titleFrom'] = $this->titleFrom;
         $this->vars['maxItems'] = $this->maxItems;
 
         $this->vars['useGroups'] = $this->useGroups;

modules/backend/formwidgets/repeater/assets/js/repeater.js

@@ -181,7 +181,7 @@
         }
 
         if (this.options.titleFrom) {
-            $target = $('[data-field-name="'+this.options.titleFrom+'"]')
+            $target = $('[data-field-name="'+this.options.titleFrom+'"]', $item)
             if (!$target.length) {
                 $target = $item
             }

modules/backend/formwidgets/repeater/partials/_repeater.htm

@@ -1,5 +1,6 @@
 <div class="field-repeater"
      data-control="fieldrepeater"
+     <?= $titleFrom ? 'data-title-from="'.$titleFrom.'"' : '' ?>
      <?= $maxItems ? 'data-max-items="'.$maxItems.'"' : '' ?>
      data-sortable-container="#<?= $this->getId('items') ?>"
      data-sortable-handle=".<?= $this->getId('items') ?>-handle">