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

core/modules/block/js/block.admin.js

@@ -0,0 +1,107 @@
+/**
+ * @file
+ * Block admin behaviors.
+ */
+
+(function ($, Drupal) {
+
+  "use strict";
+
+  /**
+   * Filters the block list by a text input search string.
+   *
+   * Text search input: input.block-filter-text
+   * Target element:    input.block-filter-text[data-element]
+   * Source text:       .block-filter-text-source
+   *
+   * @type {Drupal~behavior}
+   */
+  Drupal.behaviors.blockFilterByText = {
+    attach: function (context, settings) {
+      var $input = $('input.block-filter-text').once('block-filter-text');
+      var $element = $($input.attr('data-element'));
+      var $blocks;
+      var $details;
+
+      /**
+       * Hides the `<details>` element for a category if it has no visible blocks.
+       *
+       * @param {number} index
+       * @param {HTMLElement} element
+       */
+      function hideCategoryDetails(index, element) {
+        var $catDetails = $(element);
+        $catDetails.toggle($catDetails.find('li:visible').length > 0);
+      }
+
+      /**
+       * Filters the block list.
+       *
+       * @param {jQuery.Event} e
+       */
+      function filterBlockList(e) {
+        var query = $(e.target).val().toLowerCase();
+
+        /**
+         * Shows or hides the block entry based on the query.
+         *
+         * @param {number} index
+         * @param {HTMLElement} block
+         */
+        function showBlockEntry(index, block) {
+          var $block = $(block);
+          var $sources = $block.find('.block-filter-text-source');
+          var textMatch = $sources.text().toLowerCase().indexOf(query) !== -1;
+          $block.toggle(textMatch);
+        }
+
+        // Filter if the length of the query is at least 2 characters.
+        if (query.length >= 2) {
+          $blocks.each(showBlockEntry);
+
+          // Note that we first open all <details> to be able to use ':visible'.
+          // Mark the <details> elements that were closed before filtering, so
+          // they can be reclosed when filtering is removed.
+          $details.not('[open]').attr('data-drupal-block-state', 'forced-open');
+          // Hide the category <details> if they don't have any visible rows.
+          $details.attr('open', 'open').each(hideCategoryDetails);
+        }
+        else {
+          $blocks.show();
+          $details.show();
+          // Return <details> elements that had been closed before filtering
+          // to a closed state.
+          $details.filter('[data-drupal-block-state="forced-open"]').removeAttr('open data-drupal-block-state');
+        }
+      }
+
+      if ($element.length) {
+        $details = $element.find('details');
+        $blocks = $details.find('li');
+
+        $input.on('keyup', filterBlockList);
+      }
+    }
+  };
+
+  /**
+   * Highlights the block that was just placed into the block listing.
+   *
+   * @type {Drupal~behavior}
+   */
+  Drupal.behaviors.blockHighlightPlacement = {
+    attach: function (context, settings) {
+      if (settings.blockPlacement) {
+        $(context).find('[data-drupal-selector="edit-blocks"]').once('block-highlight').each(function () {
+          var $container = $(this);
+          // Just scrolling the document.body will not work in Firefox. The html
+          // element is needed as well.
+          $('html, body').animate({
+            scrollTop: $('.js-block-placed').offset().top - $container.offset().top + $container.scrollTop()
+          }, 500);
+        });
+      }
+    }
+  };
+
+}(jQuery, Drupal));