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<script>
$(document).ready(function(){
    var selectField = "field1";
    var formGrid = "field2";

    //when select box value is changed
    $("[name="+selectField+"]:enabled").change(function(){
        //remove all data from form grid
        $("[name="+formGrid+"]").find("table tr.grid-row").remove();
    });
});
</script>