error() public static method

Note that even if there is no validation error, this method will still return an empty error tag.
public static error ( Model $model, string $attribute, array $options = [] ) : string
$model yii\base\Model the model object
$attribute string the attribute name or expression. See [[getAttributeName()]] for the format about attribute expression.
$options array the tag options in terms of name-value pairs. The values will be HTML-encoded using [[encode()]]. If a value is null, the corresponding attribute will not be rendered. The following options are specially handled: - tag: this specifies the tag name. If not set, "div" will be used. See also [[tag()]]. - encode: boolean, if set to false then the error message won't be encoded. See [[renderTagAttributes()]] for details on how attributes are being rendered.
return string the generated label tag
BaseHtml Class Documentation
示例#1
0
">

        <?php 
echo $form->field($model, 'equipment')->checkboxList(['проектор' => 'Проектор', 'экран' => 'Экран']);
?>

    </div>

    <p class="lead">Абоненты / Переговорные комнаты</p>

    <?php 
if ($model->hasErrors('participantsId')) {
    ?>

        <?php 
    echo BaseHtml::error($model, 'participantsId', ['class' => 'alert alert-danger']);
    ?>

    <?php 
}
?>

    <div id="participants-container">

        <?php 
echo $this->render('_participants', ['model' => $model]);
?>

    </div>

    <?php