PHP - AJAX ??
AJAX ??
?? ???? ? ???? ?? ??? ?? ?? ??? ???? ?? ????? ?????.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>PHP中文網(wǎng)(php.cn)</title>
<script>
function getVote(int) {
if (window.XMLHttpRequest) {
// IE7+, Firefox, Chrome, Opera, Safari 執(zhí)行代碼
xmlhttp=new XMLHttpRequest();
} else {
// IE6, IE5 執(zhí)行代碼
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>你喜歡 PHP 和 AJAX 嗎?</h3>
<form>
是:
<input type="radio" name="vote" value="0" onclick="getVote(this.value)">
<br>否:
<input type="radio" name="vote" value="1" onclick="getVote(this.value)">
</form>
</div>
</body>
</html>
? ?? ? ??? ???? ???? "getVote()"?? ??? ?????. ? ??? "onclick" ???? ?? ??????.
getVote() ??? ?? ??? ?????.
· XMLHttpRequest ?? ??
· ?? ??? ???? ???? ?? ??
· ??? ?? ???
? ?? ??? ?? · URL ?? ??? ????(q)? ?????(???? ??? ?? ??)
PHP ??
??? JavaScript? ?? ??? ?? ???? "poll_vote.php"?? ??? PHP ?????.
<?php
$vote = htmlspecialchars($_REQUEST['vote']);
// 獲取文件中存儲(chǔ)的數(shù)據(jù)
$filename = "poll_result.txt";
$content = file($filename);
// 將數(shù)據(jù)分割到數(shù)組中
$array = explode("||", $content[0]);
$yes = $array[0];
$no = $array[1];
if ($vote == 0)
{
$yes = $yes + 1;
}
if ($vote == 1)
{
$no = $no + 1;
}
// 插入投票數(shù)據(jù)
$insertvote = $yes."||".$no;
$fp = fopen($filename,"w");
fputs($fp,$insertvote);
fclose($fp);
?>
<h2>結(jié)果:</h2>
<table>
<tr>
<td>是:</td>
<td>
<span style="display: inline-block; background-color:green;
width:<?php echo(100*round($yes/($no+$yes),2)); ?>px;
height:20px;" ></span>
<?php echo(100*round($yes/($no+$yes),2)); ?>%
</td>
</tr>
<tr>
<td>否:</td>
<td>
<span style="display: inline-block; background-color:red;
width:<?php echo(100*round($no/($no+$yes),2)); ?>px;
height:20px;"></span>
<?php echo(100*round($no/($no+$yes),2)); ?>%
</td>
</tr>
</table??? ?? JavaScript?? PHP ??? ?????. ?? ??:
1. "poll_result.txt" ??? ??? ?????
2. ??? ??? 1? ?????
3. ??? "poll_result.txt" ??? ???
4. ??? ?? ??? ?????
??? ??
?? ????? ???? ??? ??(poll_result.txt)? ?????.
???? ???? ??? ????.
5||3
? ?? ??? "?"? ?? ?? ?, ? ?? ??? "???"? ?? ?? ?? ?????.
??: ? ????? ? ??? ??? ??? ? ??? ???? ???. ? ??(PHP) ??? ?? ??? ?????? ???? ???.
