PHP and Ajax voting system_PHP tutorial
Jul 13, 2016 pm 05:47 PM
<?php
$vote=$_GET['vote'];
//echo $vote;
$filename="poll.txt";
$content=file($filename); //把整个文件读入一个数组中
$arr=explode('||',$content[0]);
$yes=$arr[0];
$no=$arr[1];
if($vote==0){
$yes=$yes+1;
}
if($vote==1){
$no=$no+1;
}
$intpoll=$yes."||".$no;
$fp=fopen($filename,'w');
fputs($fp,$intpoll);
fclose($fp);
?>
<h2>POLL:</h2>
<table>
<tr>
<td>Yes:</td>
<td>
<img src="poll.gif"
width='<?php echo(100*round($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>
//poll.js
var xmlHttp
function GetXmlHTTPObject(){
var Object=null;
if (window.XMLHttpRequest)
{
Object=new XMLHttpRequest()
}
else if (window.ActiveXObject)
{
Object=new ActiveXObject("Microsoft.XMLHTTP")
}
return Object;
}
function statechang(){
if(xmlHttp.readyState==4 || xmlHttp.readyState=="complete"){
document.getElementById("poll").
innerHTML=xmlHttp.responseText;
}
}
function getVote(int){
xmlHttp=GetXmlHTTPObject()
if(xmlHttp==null){
alert('错误！');
return
}
var url="poll.php"
url=url+"?vote="+int
url=url+"&sid="+Math.random()
xmlHttp.onreadystatechange= statechang
xmlHttp.open("GET",url,true)
xmlHttp.send(null)
}
//poll.html
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>投票（POLL）</title>
<script src="poll.js"></script>
</head>
<body>
<div id="poll">
<h2>PHP AND AJAX POLL</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>
www.2cto.com
</body>
</html>
//There is also a poll.txt file
Excerpted from chaojie2009’s column
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