Laravel 5.2 - Sweet Alert confirmation box

I have Categories listed in a view. A delete category button is also there in the view which does work and deletes the category when clicked.

What I want to do is before deleting a category, a sweet alert dialog to pop up and ask for confirmation. If confirmed, it should go to the defined route and delete the category.

The delete link is defined like this:

<a id="delete-btn" href="" class="btn btn-danger">Delete</a>

and the script is defined like this:

<script> 
    $(document).on('click', '#delete-btn', function(e) {
        e.preventDefault();
        var link = $(this);
        swal({
            title: "Confirm Delete",
            text: "Are you sure to delete this category?",
            type: "warning",
            showCancelButton: true,
            confirmButtonColor: "#DD6B55",
            confirmButtonText: "Yes, delete it!",
            closeOnConfirm: true
         },
         function(isConfirm){
             if(isConfirm){
                window.location = link.attr('href');
             }
             else{
                swal("cancelled","Category deletion Cancelled", "error");
             }
         });
    });
</script>

However, when I click the delete button it deletes the category, but the sweet alert message doesn't show up.

The route is defined as following:

Route::get('/categories/destroy/{category}', [
    'uses' => 'CategoriesController@destroy',
    'as' => 'admin.categories.destroy',
]);

and the controller function is defined as:

public function destroy(Category $category) 
{

    $category->delete();

    //this alert is working fine. however, the confirmation alert should appear 
    //before this one, which doesn't
    Alert::success('Category deleted successfully', 'Success')->persistent("Close");

    return redirect()->back();
}

Any help would be appreciated. Thanks.

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