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In this post, we try to create simple application that apply repetitive asynchronous request. The key is use JavaScript function:

setTimeout("function();", interval);

Example code like:

function handleXMLData()
{
  var xmlResponse = xmlHttp.responseXML;
  
   ...  
  var xmlData = xmlRoot.firstChild;
  var dataNodeName = xmlData.nodeName;
  if (dataNodeName != "random"){
    throw("4. Invalid XML Structure:\n " + xmlHttp.responseText);    
  }
 
 requestCounter++;  
 myDiv = document.getElementById("myDivElement"); 
 myDiv.innerHTML += "Request status: 4 (complete). <br />Request # " + requestCounter + ": "; 
 myDiv.innerHTML += xmlHttp.responseText;
 
 setTimeout("process();", interval = 1000);
 
}

Above, we always call process() function with interval 1000 milliseconds (that mean every 1 second).