javascript - Generate option select on input change - 


<select id="gameid">      //<option number 1-999> </select>  <select id="netid">      //<option number 1-999> </select>  <select id="camp_id">  <script>  var = $("#gameid").val();   var b = $("#netid").val();   var c = a+b;    (var = 1; i<=999; i++)     {         document.write("<option value='"+c+i+"'>"+c+i+"</option>");     }  </script> </select>

the code above generate options selection.

what want there is, if val in #gameid changed, option list change too, , #netid.

however, option doesn't change. stay in default value of #gameid , #netid.

i don't know missing here. need help, please.

[update]

this code work. however, when second change on #cameid after have been select, doesn't change #campid selection anymore. change again if change on #netid. 

$("#gameid" && "#netid").on('change', function(){    = $("#gameid").val(),     b = $("#netid").val(),    c = a+b;     $("#camp_id").empty();     (var = 1; i<=999; i++){     $("#camp_id").append("<option value='"+(c+i)+"'>"+(c+i)+"</option>");    }    });

don't forget add jquery library,

 <select id="gameid" onchange="generateoptions();">     <!-- options -->   </select>   <select id="netid" onchange="generateoptions();">  <!-- options -->  </select>   <select id="camp_id">   </select>     <script type="text/javascript">  var a,b,c,str="";        function generateoptions()     {       = $("#gameid").val();         b = $("#netid").val();         c = a+b;        (var = 1; i<=999; i++)        {         str= str + "<option value='"+c+i+"'>"+c+i+"</option>";        }        $('#camp_id').html(str);      }    </script>

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