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DHTML

Dynamically including JavaScript files by adam0101
Posted: 1 Aug 07

Typical solutions to this problem involve manipulating the DOM to insert a JavaScript include statement. Doing it this way may cause an error if a function from the file is called immediately after including the file because the browser still has to retrieve it from the server. To get past this you can use AJAX to make a synchonous call to the server to get the file contents.

CODE

function include(src)
{
  var js=document.createElement('script');
  js.type='text/javascript';

  // Attempt to create an AJAX object
  var xmlHttp;
  try{xmlHttp=new XMLHttpRequest();}
  catch(e){
    try{xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");}
    catch(e){
      try{xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");}
      catch(e){
        // Ajax not supported, use DOM instead.
        js.src=src;document.getElementsByTagName('head')[0].appendChild(js);
      }
    }
  }

  if(xmlHttp){
    xmlHttp.open("GET",src,false);
    xmlHttp.onreadystatechange=function(){
      if(xmlHttp.readyState==4){
        js.text = xmlHttp.responseText;
        document.getElementsByTagName('head')[0].appendChild(js);
      }
    }
    xmlHttp.send(null);
  }
}

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