Refactored filter error display for GridView.

framework/base/ErrorHandler.php

@@ -46,7 +46,7 @@ abstract class ErrorHandler extends Component
 
 
     /**
-     * Register this errorhandler
+     * Register this error handler
      */
     public function register()
     {

framework/grid/DataColumn.php

@@ -141,16 +141,22 @@ class DataColumn extends Column
     {
         if (is_string($this->filter)) {
             return $this->filter;
-        } elseif ($this->filter !== false && $this->grid->filterModel instanceof Model &&
-                  $this->attribute !== null && $this->grid->filterModel->isAttributeActive($this->attribute)) {
-            if ($this->grid->filterModel->hasErrors($this->attribute)) {
+        }
+
+        $model = $this->grid->filterModel;
+
+        if ($this->filter !== false && $model instanceof Model && $this->attribute !== null && $model->isAttributeActive($this->attribute)) {
+            if ($model->hasErrors($this->attribute)) {
                 Html::addCssClass($this->filterOptions, 'has-error');
+                $error = Html::error($model, $this->attribute, $this->grid->filterErrorOptions);
+            } else {
+                $error = '';
             }
             if (is_array($this->filter)) {
                 $options = array_merge(['prompt' => ''], $this->filterInputOptions);
-                return Html::activeDropDownList($this->grid->filterModel, $this->attribute, $this->filter, $options);
+                return Html::activeDropDownList($model, $this->attribute, $this->filter, $options) . ' ' . $error;
             } else {
-                return Html::activeTextInput($this->grid->filterModel, $this->attribute, $this->filterInputOptions);
+                return Html::activeTextInput($model, $this->attribute, $this->filterInputOptions) . ' ' . $error;
             }
         } else {
             return parent::renderFilterCellContent();

framework/grid/GridView.php

@@ -15,7 +15,6 @@ use yii\helpers\Url;
 use yii\helpers\Html;
 use yii\helpers\Json;
 use yii\widgets\BaseListView;
-use yii\helpers\ArrayHelper;
 use yii\base\Model;
 
 /**
@@ -142,6 +141,9 @@ class GridView extends BaseListView
      * Both "format" and "label" are optional. They will take default values if absent.
      */
     public $columns = [];
+    /**
+     * @var string the HTML display when the content of a cell is empty
+     */
     public $emptyCell = ' ';
     /**
      * @var \yii\base\Model the model that keeps the user-entered filter data. When this property is set,
@@ -161,6 +163,9 @@ class GridView extends BaseListView
      * as GET parameters to this URL.
      */
     public $filterUrl;
+    /**
+     * @var string additional jQuery selector for selecting filter input fields
+     */
     public $filterSelector;
     /**
      * @var string whether the filters should be displayed in the grid view. Valid values include:
@@ -175,18 +180,29 @@ class GridView extends BaseListView
      * @see \yii\helpers\Html::renderTagAttributes() for details on how attributes are being rendered.
      */
     public $filterRowOptions = ['class' => 'filters'];
+    /**
+     * @var array the options for rendering the filter error summary.
+     * Please refer to [[Html::errorSummary()]] for more details about how to specify the options.
+     * @see renderErrors()
+     */
+    public $filterErrorSummaryOptions = ['class' => 'error-summary'];
+    /**
+     * @var array the options for rendering every filter error message.
+     * This is mainly used by [[Html::error()]] when rendering an error message next to every filter input field.
+     */
+    public $filterErrorOptions = ['class' => 'help-block'];
 
     /**
      * @var string the layout that determines how different sections of the list view should be organized.
      * The following tokens will be replaced with the corresponding section contents:
      *
      * - `{summary}`: the summary section. See [[renderSummary()]].
-     * - `{errors}`: the filter model errors. See [[renderErrors()]].
+     * - `{errors}`: the filter model error summary. See [[renderErrors()]].
      * - `{items}`: the list items. See [[renderItems()]].
      * - `{sorter}`: the sorter. See [[renderSorter()]].
      * - `{pager}`: the pager. See [[renderPager()]].
      */
-    public $layout = "{summary}\n{errors}\n{items}\n{pager}";
+    public $layout = "{summary}\n{items}\n{pager}";
 
     /**
      * Initializes the grid view.
@@ -233,12 +249,15 @@ class GridView extends BaseListView
     public function renderErrors()
     {
         if ($this->filterModel instanceof Model && $this->filterModel->hasErrors()) {
-            return Html::tag('div', Html::ul($this->filterModel->getFirstErrors(), ['class' => 'help-block']), ['class' => 'has-error']);
+            return Html::errorSummary($this->filterModel, $this->filterErrorSummaryOptions);
         } else {
             return '';
         }
     }
 
+    /**
+     * @inheritdoc
+     */
     public function renderSection($name)
     {
         switch ($name) {

framework/helpers/BaseHtml.php

@@ -1047,7 +1047,10 @@ class BaseHtml
     public static function errorSummary($models, $options = [])
     {
         $lines = [];
-        foreach ((array)$models as $model) {
+        if (!is_array($models)) {
+            $models = [$models];
+        }
+        foreach ($models as $model) {
             /** @var Model $model */
             foreach ($model->getFirstErrors() as $error) {
                 $lines[] = Html::encode($error);