User Poll Script using Ajax and PHP

In this tutorial, we'll be creating an Ajax Poll Script that displays the results with colored images using PHP and Ajax.

This is a very simple Ajax poll script. Poll results will be displayed on the current page without moving to another page. The result of the poll is stored in a separate text file and results will be displayed based on the values stored in this file.As the data is saved in flat file it does not require any database.

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index.php

<html>

<head>

<script>

function Vote(int)

{
if (window.XMLHttpRequest)
  {// code for IE7+, Firefox, Chrome, Opera, Safari
  xmlhttp=new XMLHttpRequest();
  }
else
  {// code for IE6 and IE5
  xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
  }
xmlhttp.onreadystatechange=function()
  {
  if (xmlhttp.readyState==4 && xmlhttp.status==200)
    {
    document.getElementById("poll").innerHTML=xmlhttp.responseText;
    }
  }
xmlhttp.open("GET","vote.php?vote="+int,true);
xmlhttp.send();
}
</script>
</head>
<body>

<div id="poll">
<h3>
Do you like PHP Dev Zone?</h3>
<form>
Yes:
<input name="vote" onclick="Vote(this.value)" type="radio" value="1" />

No:
<input name="vote" onclick="Vote(this.value)" type="radio" value="0" />
</form>
</div>
</body>
</html>

vote.php

`Result:`

<table>

<tbody>

<tr>

<td>Yes:</td>

<td><img alt="poll" height="20" src="pollyes.jpg" width="<?php echo(100*round($yes/($no+$yes),2)); ?>" />

%

</td>

</tr>

<tr>

<td>No:</td>

<td><img alt="poll" height="20" src="pollno.jpg" width="<?php echo(100*round($no/($no+$yes),2)); ?>" />

%

</td>

</tr>

<tr><td></td></tr>

<tr><td><a href="http://php-dev-zone.blogspot.in/2013/05/user-poll-script-using-ajax-and-php.html">Back To Tutorial</a></td></tr>

</tbody></table>

Below are the snapshots of the script output.

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