How to use javascript:void(0) in a form action in Laravel? [Laravel 5.1]

as we all know javascript:void(0) is used to set action as undefined in simple html.
But i need to use same thing in laravel blade as stated below:

{!! Form::open(array('url' => '#', 'class' => 'form-search', 'id'=>'search_form')) !!}

how to set form action as javascript:void(0) in the above code.

Please help me to sort out this issue.

Thanks.

via Chebli Mohamed