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<h1>PHP and AJAX Poll</h1>
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<hr />
<h2>AJAX Suggest</h2>
<p>In the AJAX example below we will demonstrate a poll where the web page can
get the result without reloading.</p>
<hr>
<div id="poll">
<h2>Do you like PHP and AJAX so far?</h2>
<form>
Yes:
<input type="radio" name="vote" value="0" onclick="getVote(this.value)">
<br />
No:
<input type="radio" name="vote" value="1" onclick="getVote(this.value)">
</form>
</div>
This example consists of four pages:<ul>
<li>a simple HTML form</li>
<li>a JavaScript</li>
<li>a
PHP page</li>
<li>a text file to store the results</li>
</ul>
<hr>
<h2>The HTML Form</h2>
<p>This is the HTML page. It contains a simple HTML form and a link to a
JavaScript:</p>
<table class="ex" id="table11" border="1" width="100%">
<tr>
<td>
<pre><html>
<head>
<script src="poll.js"></script>
</head>
<body></pre>
<pre><div id="poll">
<h2>Do you like PHP and AJAX so far?</h2></pre>
<pre><form>
Yes:
<input type="radio" name="vote"
value="0" onclick="getVote(this.value)">
<br />No:
<input type="radio" name="vote"
value="1" onclick="getVote(this.value)">
</form>
</div></pre>
<pre></body>
</html></pre>
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<h2>Example Explained - The HTML Form</h2>
<p>As you can see, the HTML page above contains a simple HTML form inside a
"<div>" with two radio buttons.</p>
<p>The form works like this:</p>
<ol>
<li>An event is triggered when the user selects the "yes" or "no" option</li>
<li>When the event is triggered, a function called getVote() is executed.
</li>
<li>Around the form is a <div> called "poll". When the data
is returned from the getVote() function, the return data will replace the
form.</li>
</ol>
<hr>
<h2>The Text File</h2>
<p>The text file (poll_result.txt) is where we store the data from the poll. </p>
<p>It is stored like this:</p>
<table class="ex" id="table13" border="1" width="100%">
<tr>
<td>
<pre>0||0</pre>
</td>
</tr>
</table>
<p>The first number represents the "Yes" votes, the second number represents the
"No" votes.</p>
<p><b>Note:</b> Remember to allow your web server to edit the text file. Do <b>
NOT</b> give everyone access, just the web server (PHP).</p>
<hr>
<h2>The JavaScript</h2>
<p>The JavaScript code is stored in "poll.js" and linked to in the HTML
document:</p>
<table class="ex" id="table12" border="1" width="100%">
<tr>
<td>
<pre>var xmlHttp
function getVote(int)
{
xmlHttp=GetXmlHttpObject()
if (xmlHttp==null)
{
alert ("Browser does not support HTTP Request")
return
}
var url="poll_vote.php"
url=url+"?vote="+int
url=url+"&sid="+Math.random()
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