selectbox

html

<select name="param1" id="select1">

<option value="">---------</option>

</select>

code1:

$('#select1').append($('<option>').attr({ value: value.id }).text(value.label));

code2:

$('#select1 > option').remove();

code3:

var f = function(){ };

$('#select1').change(f).keypress(f);