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JavaScript

responseText AJAX

Hy all i am learning AJAX and i am able to send request but i m not getting any thing print on my index.php in div tag with id #msg

here is my all scripts which i use in my localserver

index.php
<html>
<head>
    <title>Ajax form submission</title>
    <link rel="stylesheet" type="text/css" href="normalize.css">
    <link rel="stylesheet" type="text/css" href="style.css">
</head>
<body>


  <!--sign up -->
     <form action = "register.php" method="post">
        <input type="text" name="firstName" id="firstName" onkeyup="validate('firstName',this.value)" placeholder="Enter your firstname">
          <div id="msg"></div>
        <input type="text" name="lastName" id="lastName" placeholder="Enter your lastname">

          <input type="text" name="userName" id="userName" placeholder="Enter your username">

          <input type="password" name="password" id="password" placeholder="Enter your password">

          <input type="password" name="con_password" id="con_password" placeholder="Confirm your password">

          <input type="button" class="sign" name="signup" value="signup" onclick="checkform">
     </form>
     <script src="js/script.js"></script>
</body>
</html>
</head>
script.js
function validate(field,value){


    var request; 

    if(window.XMLHttpRequest){
      request = new XMLHttpRequest(); request(IE7+,other browsers)
    }else{
       request = new ActiveXObject("Microsft.XMLHTTP")
    }

    //request state
    request.onreadystatechange = function(){
        if(request.readystate == 4 && request.status == 200){
            console.log(request.responseText);
        }
    }

    request.open("GET","validation.php?field=" + field + "&query=" + value);
    request.send();
}
validation.php
<?php

  echo "<span>Hey</span>";

?>