[SOLVED] Error: document.getElementById("abottomPart") is null line 55

[Dethman]

here is the function it deals with I will mark line 55 for you

 

function do_option()
{
  var xmlHttp = getXMLHttp();
  var id = document.getElementById("id").value;
    
  xmlHttp.onreadystatechange = function()
  {
    if(xmlHttp.readyState == 4)
    {
      handle_option(xmlHttp.responseText);
    }
  }
   
       
   var option = document.getElementById("options").value;

  xmlHttp.open("GET", "option_js.php?option=" + option + "", true);
  xmlHttp.send(null);
}

function handle_option(type){

// LINE 55   document.getElementById('abottomPart').innerHTML = type;


}

 

If anyone could explain to me why this error is appearing it would be great,

 

Thank you for your views

[Calver]

Are you triggering the Ajax function before the document has been fully rendered, to include the 'abottomPart' element?