i'm using jquery and i want to disable my button initially to prevent it from submitting null values.

here is my code

```
<form method = "get" action = "" >
        <div id="select-vehicle">
         <select class = "form-control">
            <option  selected disabled  > Select Vehicles</option>

        </select>

        </div>
        <button type = "submit" value = "submit" id= "submit">TEST</button>
        </form>

```

and here is my jquery right now 

```
var workers = ["car1", "car2", "car3"];
        for(var i=0; i< workers.length;i++)
    {
    //creates option tag
      jQuery('<option/>', {
            value: workers[i],
            html: workers[i]
            }).appendTo('#select-vehicle select'); //appends to select if parent div has id dropdown
    }
  $('button').click(function(event) {
    var value = $( "select" ).val();
    $('form').attr('action', 'accessories/vehicles/' + value +'/');
  });

```

Thanks!