how to add onclick event in anchor button?

first see my post. i am not asking in normal . my doubt is doing in anchor function .

How about re-formatting your anchor like this?

PHP Code:

  <?php
        anchor('Users/deleteFile/' . $row['markid'] . '/' . $row['appno'], ' ', [
            'class'   => 'fa fa-remove',
            'onclick' => "return confirm('Are you sure to delete data?')",
            'style'   => 'font-size:25px;color:red'
            ]
        );
 ?>

Mr Pertti  already answered my post.