[Solved] Save value of a drop-down list and reassign it

by 


   var lastValue;

    $('#qty').live('change', function () {
       if ((this.value) == 10) {
           $(this).replaceWith($('<input/>', {
               'type': 'text',
               'value': +(this.value)
            }));
       }
       else{
          lastValue = this.value;
       }
    });

And then use lastValue to reset the value of the selectbox when you have to show it.

EDIT : modified the jsfiddle, you jsut need to create the list again
http://jsfiddle.net/qje6uywg/5/

solved Save value of a drop-down list and reassign it