element id is not accessible javascript -

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i have following code. here declaring element id's variables global before functions declared. variables taken functions below sample:

var ddlpf=document.getelementbyid('<%=ddlpf.clientid%>');   var disp_msg=document.getelementbyid('<%=disp_msg.clientid%>');   function btn_proceed_click()   {      var ses='<%=session("hcur").tostring %>';      if(pos_valid()==true)      alert('success');   }  function pos_valid()   {      var pos_valid=false;      var ses;      var ccy;      var ccy1;      var ccy2;      var as11costbud;      ses='<%=session("hcur").tostring %>';      var bm='<%=session("benchmark").tostring %>';      var dtsheet='<%=session("dtsheet").tostring %>';      var ratedis='<%=session("ratedis").tostring %>';      if(ddlpf.selectedindex <= 0)      {          message("please select portfolio");          return;      }      pos_valid=true;      return pos_valid;

} 

function message(msg)   {       disp_msg.innerhtml=msg;       var modalpopupbehaviorctrl = $find('modalpop');                   modalpopupbehaviorctrl.set_popupcontrolid("poppan");         modalpopupbehaviorctrl.show();    }

if declare variable "ddlpf" inside pos_valid() , "disp_masg" inside message(), works. code this:

function pos_valid()       {             var ddlpf=document.getelementbyid('<%=ddlpf.clientid%>');           //code     }  function message()        {         var disp_msg=document.getelementbyid('<%=disp_msg.clientid%>');          //code     }

but these id's common 5 functions. not two. have 20 id's common 5 big functions. thats why have declared them outside functions.

what change should make?

i guessing putting script @ top of html page. page has not finished loading yet , trying access document.getelementbyid before document.body ready. when access them in functions, variables value undefined => problem

try way,

var ddlpf;   var disp_msg;    window.onload = function(){     ddlpf=document.getelementbyid('<%=ddlpf.clientid%>');       disp_msg=document.getelementbyid('<%=disp_msg.clientid%>');   }

this way, can put code anywhere.


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