Drupal 8.0.0 beta 12. More info: https://www.drupal.org/node/2514176

core/modules/views/src/Ajax/ScrollTopCommand.php

@@ -0,0 +1,46 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\views\Ajax\ScrollTopCommand.
+ */
+
+namespace Drupal\views\Ajax;
+
+use Drupal\Core\Ajax\CommandInterface;
+
+/**
+ * Provides an AJAX command for scrolling to the top of an element.
+ *
+ * This command is implemented in Drupal.AjaxCommands.prototype.viewsScrollTop.
+ */
+class ScrollTopCommand implements CommandInterface {
+
+  /**
+   * A CSS selector string.
+   *
+   * @var string
+   */
+  protected $selector;
+
+  /**
+   * Constructs a \Drupal\views\Ajax\ScrollTopCommand object.
+   *
+   * @param string $selector
+   *   A CSS selector.
+   */
+  public function __construct($selector) {
+    $this->selector = $selector;
+  }
+
+  /**
+   * Implements \Drupal\Core\Ajax\CommandInterface::render().
+   */
+  public function render() {
+    return array(
+      'command' => 'viewsScrollTop',
+      'selector' => $this->selector,
+    );
+  }
+
+}