Feature/pagination focus

CHANGELOG-WIP.md

@@ -4,6 +4,7 @@
 - Added `craft\web\Controller::getCurrentUser()`. ([#11754](https://github.com/craftcms/cms/pull/11754))
 
 ### Changed
+- Improved the control panel accessibility. ([#11565](https://github.com/craftcms/cms/pull/11565))
 - `users/session-info` responses now include a `csrfTokenName` key. ([#11706](https://github.com/craftcms/cms/pull/11706))
 - `craft\services\Search::EVENT_BEFORE_INDEX_KEYWORDS` is now cancellable by setting `$event->isValid` to `false`. ([#11705](https://github.com/craftcms/cms/discussions/11705))
 - `checkboxSelect` inputs without `showAllOption: true` now post an empty value if no options were selected. ([#11748](https://github.com/craftcms/cms/issues/11748))

src/web/assets/cp/src/js/BaseElementIndex.js

@@ -801,7 +801,7 @@ Craft.BaseElementIndex = Garnish.Base.extend(
       return params;
     },
 
-    updateElements: function (preservePagination) {
+    updateElements: function (preservePagination, pageChanged) {
       // Ignore if we're not fully initialized yet
       if (!this.initialized) {
         return;
@@ -836,6 +836,11 @@ Craft.BaseElementIndex = Garnish.Base.extend(
             : this.$main
           ).scrollTop(0);
           this._updateView(params, response.data);
+
+          if (pageChanged) {
+            const $elementContainer = this.view.getElementContainer();
+            Garnish.firstFocusableElement($elementContainer).trigger('focus');
+          }
         })
         .catch((e) => {
           this.setIndexAvailable();
@@ -1979,7 +1984,7 @@ Craft.BaseElementIndex = Garnish.Base.extend(
                   this.removeListener($prevBtn, 'click');
                   this.removeListener($nextBtn, 'click');
                   this.setPage(this.page - 1);
-                  this.updateElements(true);
+                  this.updateElements(true, true);
                 });
               }
 
@@ -1988,7 +1993,7 @@ Craft.BaseElementIndex = Garnish.Base.extend(
                   this.removeListener($prevBtn, 'click');
                   this.removeListener($nextBtn, 'click');
                   this.setPage(this.page + 1);
-                  this.updateElements(true);
+                  this.updateElements(true, true);
                 });
               }
             }

src/web/assets/garnish/src/Garnish.js

@@ -402,6 +402,14 @@ Garnish = $.extend(Garnish, {
     return $(container).find(':focus').length > 0;
   },
 
+  /**
+   * Gets the first focusable element inside a container
+   * @param {Object} container
+   */
+  firstFocusableElement: function (container) {
+    return $(container).find(':focusable').first();
+  },
+
   /**
    * Traps focus within a container, so when focus is tabbed out of it, it’s cycled back into it.
    * @param {Object} container