view nya

 <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

       <link rel="stylesheet" href="<?php echo base_url();?>jquery/jquery-ui.css" type="text/css" media="all" />
      <link rel="stylesheet" href="<?php echo base_url();?>jquery/ui.theme.css" type="text/css" media="all" />
      <script src="<?php echo base_url();?>jquery/jquery.min.js" type="text/javascript"></script>
      <script src="<?php echo base_url();?>jquery/jquery-ui.min.js" type="text/javascript"></script>

    </head>
    <body>
   <?php echo $this->session->flashdata('msg'); ?>
    <?php echo form_open('insert/input'); ?>
<div id="stream" >
    Stream      : <?php
        echo form_dropdown("stream",$stream,"","id='stream_id'");
    ?><br>
</div>
   <div id="materi">
    Materi      :
 <?php
        echo form_dropdown("materi",array('Pilih materi'=>'Pilih stream Dahulu'),'','disabled');
    ?><br>
   </div>

    <?php echo form_submit("Simpan","simpan"); ?>
 <?php echo form_close(); ?>
 <script type="text/javascript">
        $("#stream_id").change(function(){
                var selectValues = $("#stream_id").val();
                if (selectValues == 0){
                    var msg = "Materi : <select name=\"materi\" disabled><option value=\"Pilih materi\">Pilih stream Dahulu</option></select>";
                    $('#materi').html(msg);
                }else{
                    var stream_id = {stream_id:$("#stream_id").val()};
                    $('#materi_id').attr("disabled",true);
                    $.ajax({
                            type: "POST",
                            url : "<?php echo site_url('chain/select_kota')?>",
                            data: stream,
                            success: function(msg){
                                $('#kota').html(msg);
                            }
                    });
                }
        });
       </script>