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xmlHttp.onreadystatechange=stateChanged
xmlHttp.open("GET",url,true)
xmlHttp.send(null)
}
function stateChanged()
{
if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete")
{
document.getElementById("poll").
innerHTML=xmlHttp.responseText;
}
}
function GetXmlHttpObject()
{
var objXMLHttp=null
if (window.XMLHttpRequest)
{
objXMLHttp=new XMLHttpRequest()
}
else if (window.ActiveXObject)
{
objXMLHttp=new ActiveXObject("Microsoft.XMLHTTP")
}
return objXMLHttp
}</pre>
</td>
</tr>
</table>
<h2>Example Explained</h2>
<p>The stateChanged() and GetXmlHttpObject functions are the same as in the
<a href="php_ajax_suggest.asp">PHP AJAX Suggest</a> chapter.</p>
<p><b>The getVote() Function</b></p>
<p>This function executes when "yes" or "no" is selected in the HTML form.</p>
<ol>
<li>Defines the url (filename) to send to the server</li>
<li>Adds a parameter (vote) to the url with the content of the input field
</li>
<li>Adds a random number to prevent the server from using a cached file</li>
<li>Calls on the GetXmlHttpObject function to create an XMLHTTP object, and tells the object to execute a function
called stateChanged when a change is triggered</li>
<li>Opens the XMLHTTP object with the given url.</li>
<li>Sends an HTTP request to the server</li>
</ol>
<hr>
<h2>The PHP Page</h2>
<p>The server page called by the JavaScript code is a simple PHP file called "poll_vote.php".</p>
<table class="ex" id="table10" border="1" width="100%">
<tr>
<td>
<pre><?php
$vote = $_REQUEST['vote'];</pre>
<pre>//get content of textfile
$filename = "poll_result.txt";
$content = file($filename);</pre>
<pre>//put content in array
$array = explode("||", $content[0]);
$yes = $array[0];
$no = $array[1];</pre>
<pre>if ($vote == 0)
{
$yes = $yes + 1;
}
if ($vote == 1)
{
$no = $no + 1;
}</pre>
<pre>//insert votes to txt file
$insertvote = $yes."||".$no;
$fp = fopen($filename,"w");
fputs($fp,$insertvote);
fclose($fp);
?></pre>
<pre><h2>Result:</h2>
<table>
<tr>
<td>Yes:</td>
<td>
<img src="poll.gif"
width='<?php echo(100*round($yes/($no+$yes),2)); ?>'
height='20'>
<?php echo(100*round($yes/($no+$yes),2)); ?>%
</td>
</tr>
<tr>
<td>No:</td>
<td>
<img src="poll.gif"
width='<?php echo(100*round($no/($no+$yes),2)); ?>'
height='20'>
<?php echo(100*round($no/($no+$yes),2)); ?>%
</td>
</tr>
</table></pre>
</td>
</tr>
</table>
<p>The selected value is sent from the JavaScript and the following
happens:</p>
<ol>
<li>Get the content of the "poll_result.txt" file</li>
<li>Put the content of the file in variables and add one to the selected
variable</li>
<li>Write the result to the "poll_result.txt" file</li>
<li>Output a graphical representation of the poll result</li>
</ol>
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