Select label drop-down list secondary linkage cascade example code_javascript skills

var options=new Array();
$ (document).ready(function(){
                                                                                                                                                                                                                                                                       ='' $(this).text() '';
           });//Put the option list To the array
$('#ddlPages option:gt(0)').remove(); //Clear the drop-down
$('#ddlSubsystems').bind('change',function(){ / /Register event
var systemname=$('#ddlSubsystems option:selected').text();
for(var j=0;j                                              ddlPages').append(options[j]);
                                                                                                                                                                        
var textname=$(this).text();
var index=textname.indexOf('-' systemname);
if(index<0){
$(this).remove ();
                                                                                                                                                                     $('#ddlPages'). val(0);                                                                                                                                                                                                                                                 // The first row is selected by default
       });