LARAVEL: Use a javascript variabele in php

I would like to get an id from a button. I need this id in my ajax request. This is my button:

 <form>
      <div class="form-group">
         <button class="btn btn-primary" name="deletecar" id="">Delete</button>
      </div>
 </form>

As you can see, the button id is filled with data from my database.

I'm getting the id of the button this way:

<script type="text/javascript">var JcarID = this.id;</script>

Finally my Ajax Request.

$('[name="deletecar"]').click(function (e)
        {
            var JcarId = this.id;
            e.preventDefault();
            $.ajax({
                type: "POST",
                url: '',
                success: function (data)
                {
                  //   alert(data);
                }
            });
        });

I would like to set the value of $car->id == JcarId.

Sorry for my bad english,

Thx for reading!

via Koen van de Sande