How to give active class to clicked button in Yii2 - yii2

Question

I am a new member in Yii2. I integrated new template with by default Yii2 advanced template. I need to use active class to clicked menu from side bar. Below my code. How can I do it? Please help me
<li class="">
<?= Html::a('<i class="glyphicon glyphicon-education"></i><span>Суд жараёни</span>', ['law1/']) ?>
</li>
<li class="">
<?= Html::a('<i class="glyphicon glyphicon-check"></i><span>МИБ</span>', ['law2/']) ?>
</li>
<li class="">
<?= Html::a('<i class="glyphicon glyphicon-ruble"></i><span>Прократура</span>', ['law3/']) ?>
</li>
<li class="">
<?= Html::a('<i class="glyphicon glyphicon-bitcoin"></i><span>Банк</span>', ['law4/']) ?>
</li>

Answer 1

Some Simple Approaches
You can compare the controller/route/action to the URL and if they match add an active class with a yii2 helper:
Simple add class to html link:
<?php
use yii\helpers\Html;
$controller = Yii::$app->controller->id;
$options = ['class' => ['btn btn-md btn-default']];
if ($controller == 'batch') {
Html::addCssClass($options, ['active']);
}
echo $link = Html::a('SomeLink', ['batch/view'], $options);
echo $link = Html::a('SomeLink', ['batch/view'],);
?>
If using a nav widget, you can leverage the active and visible properties:
<?php
use mdm\admin\components\Helper;
$controller = Yii::$app->controller->id;
echo kartik\sidenav\SideNav::widget([
'type' => SideNav::TYPE_DEFAULT,
'items' => [
[
'url' => ['supplier/index'],
'label' => 'Suppliers',
//'icon' => 'th-list',
'active' => $controller == 'supplier',
'visible' => Helper::checkRoute('supplier/index'),
],
[
'url' => ['site/index'],
'label' => 'Sites',
//'icon' => 'th-list',
'active' => $controller == 'site',
'visible' => Helper::checkRoute('site/index'),
],
],
]);
?>