Alert popup flash messages without bootstrap
The preferred way to install this extension is through composer.
Either run
php composer.phar require --prefer-dist stronglab/yii2-alert "*"
or add
"stronglab/yii2-alert": "*"
to the require section of your composer.json file.
Once the extension is installed, simply use it in your code by :
<?= \stronglab\alert\FlashMessage::widget(); ?>