PALS3004: Web Programming Demo 8-1

<html>
<head>
<title>PALS3004: Web Programming Demo 8-1</title>
<script>
function button1click() {
   var req=new XMLHttpRequest();
   req.open("GET","mydata.txt");
   req.onreadystatechange=function () {
      if ((req.readyState==4)&&(req.status==200))
         processData(req.responseText);
   };
   req.send();
}
function processData(txt) {
   document.getElementById("response").innerHTML=txt;
}
</script>
</head>
<body>

  <h2>Demo 8-1: Demonstrate XMLHttpRequest</h2>

  <p><button onclick="button1click()">Get Text</button>
  <p><textarea id="response" rows="15" cols="80">
  </textarea>
  
</body>
</html>