Problems jquery ajax

Question

I have a problem which is this:

in my system I have a combo that serves as parameter to load( via ajax) a second combo, this works normally.

Hence I need that when clicking an item in a table, the first combo is updated and based on the selected item of the combo it loads a second combo.

But it doesn’t work!

I’ve used / live / bind from jquery, but it doesn’t work

follows the code:

$('.tableLineCargo'). live(click', fillCargo); $('#responsavelcombo'). on('change', listAlvos);

    function listarAlvos(){
      var dados = {
        acao: 'combo',
        nome: alvo
      };

      var vurl;
      var respcombo = $('#responsavelcombo').val();

      if (respcombo == 0){
        $('#alvocombo').html("");
      }else{
        if (respcombo == 1){vurl = 'associacaocrud.php';}
        if (respcombo == 2){vurl = 'grupocrud.php';}
        if (respcombo == 3){vurl = 'regiaocrud.php';}
        if (respcombo == 4){vurl = 'templocrud.php';}

        $.ajax({
          url: vurl,
          type: 'POST',
          data: dados,
          success: function(retorno){
            $('#alvocombo').html(retorno);           
          }
        });
      }
    };