API Create a new GridFieldLazyLoader GridField component

src/Forms/GridField/GridFieldLazyLoader.php

@@ -0,0 +1,47 @@
+<?php
+
+namespace SilverStripe\Forms\GridField;
+
+use SilverStripe\ORM\ArrayList;
+use SilverStripe\ORM\SS_List;
+
+/**
+ * GridFieldLazyLoader alters the {@link GridField} behavior to delay rendering of rows until the tab containing the
+ * GridField is selected by the user.
+ *
+ * @see GridField
+ */
+class GridFieldLazyLoader implements GridField_DataManipulator, GridField_HTMLProvider
+{
+
+    /**
+     * @inheritDoc
+     */
+    public function getManipulatedData(GridField $gridField, SS_List $dataList)
+    {
+        return $this->isLazy($gridField) ?
+            ArrayList::create([]) :
+            $dataList;
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function getHTMLFragments($gridField)
+    {
+        $gridField->addExtraClass($this->isLazy($gridField) ?
+            'grid-field-lazy-loadable' :
+            'grid-field-lazy-loaded');
+        return [];
+    }
+
+    /**
+     * Detect if the current request should include results
+     * @param GridField $gridField
+     * @return bool
+     */
+    private function isLazy(GridField $gridField)
+    {
+        return $gridField->getRequest()->getHeader('X-Pjax') !== 'CurrentField';
+    }
+}