on delete无法获取我的根目录路径

I am getting wrong path on delete action. my forum directory

path is //localhost/laravel/public/forum .and on light box the delete button making path is //localhost/forum/group/2/delete . but i want this path is like

//localhost/laravel/public/forum/group/5/delete  ..

here is app.js code

$('.delete_group').click(function(event)    {
        $('#btn_delete_group').prop('href', '/forum/group/' +
event.target.id + '/delete');   });

and button is

<a href="#" class="btn btn-primary"
id="btn_delete_group">Delete</a>

when i move the cursor on this delete button it shows

//localhost/forum/group/2/delete