jquery-option select ADD and REMOVE

javascript-combo
javascript-select-option


$( "#password" ).blur(function() {
s0=_lookup('username');
s1=_lookup('password');
s='tableRead?db=hr&table=USER&fields=COMPANY_NAME&where=where '+
'login_id:`'+s0+'` and password:sha(`'+s1+'`) &format=S&callback=?';
$.getJSON(s,
 function(data) {
 if (data[0]){
$("#companyname").removeAttr("disabled");
$('#companyname').find('option').remove().end()  //combo clear combo-clear 
for (r=0; r<data.length; r++){
var o = new Option(data[r][0],data[r][0] );
$(o).html(data[r][0]);
$("#companyname").append(o);
}
  }  else {
$('#companyname').find('option').remove().end().append('<option value=""></option>').val('');
$("#companyname").attr( "disabled", "disabled" );
  }
 }
);
});