javascript - 与独特选民的民意调查代码 - Thinbug

与独特选民的民意调查代码

时间：2014-05-25 00:27:50

标签： javascript php jquery ajax unique-index

我有一个由w3schools.com提供的民意调查的PHP / AJAX代码:) 我想让用户只投票一次（每天投票一次或每24小时投票一次），不知道吗？

Javascript部分

<html>
<head>
<script>
function getVote(int) {
  if (window.XMLHttpRequest) {
    xmlhttp=new XMLHttpRequest();
  } else {  
    xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
  }
  xmlhttp.onreadystatechange=function() {
    if (xmlhttp.readyState==4 && xmlhttp.status==200) {
      document.getElementById("poll").innerHTML=xmlhttp.responseText;
    }
  }
  xmlhttp.open("GET","poll_vote.php?vote="+int,true);
  xmlhttp.send();
}
</script>
</head>

<body>
<div id="poll">
<h3>First Question?</h3>
<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>
</body>
</html>

PHP部分

<?php
$vote = $_REQUEST['vote'];

$filename = "poll_result.txt";
$content = file($filename);

$array = explode("||", $content[0]);
$yes = $array[0];
$no = $array[1];

if ($vote == 0) {
  $yes = $yes + 1;
}
if ($vote == 1) {
  $no = $no + 1;
}

$insertvote = $yes."||".$no;
$fp = fopen($filename,"w");
fputs($fp,$insertvote);
fclose($fp);
?>

<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>

谢谢！

1 个答案:

答案 0 :(得分：0)

你可以试试这个。

<script>
function setCookie(cname,cvalue,exdays)
{
var d = new Date();
d.setTime(d.getTime()+(exdays*24*60*60*1000));
var expires = "expires="+d.toGMTString();
document.cookie = cname + "=" + cvalue + "; " + expires;
}

function getCookie(cname)
{
var name = cname + "=";
var ca = document.cookie.split(';');
for(var i=0; i<ca.length; i++)
  {
  var c = ca[i].trim();
  if (c.indexOf(name)==0) return c.substring(name.length,c.length);
}
return "";
}


function getVote(int) {
  if (window.XMLHttpRequest) {
    xmlhttp=new XMLHttpRequest();
  } else {  
    xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
  }
  xmlhttp.onreadystatechange=function() {
    if (xmlhttp.readyState==4 && xmlhttp.status==200) {
      setCookie("voted",1,1)
      document.getElementById("poll").innerHTML=xmlhttp.responseText;
    }
  }
  xmlhttp.open("GET","poll_vote.php?vote="+int,true);
  if(!getCookie("voted")){
    xmlhttp.send();
    }
    else{
    alert("you already voted!")
    }
}
</script>

还有第二种变体是将投票的IP存储在数据库或文件中。