AJAX ??
AJAX ??
?? ???? ? ???? ?? ??? ?? ?? ??? ???? ?? ????? ?????.
PHP? AJAX? ???????
?:
???:
?? ?? - HTML ???
? ?? ? ??? ???? ???? "getVote()"?? ??? ?????. ? ??? "onclick" ???? ?? ??????.
poll.html ?? ??? ??? ????.
<html>
<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() ??? ?? ??? ?????.
1) XMLHttpRequest ?? ??
2 ) Create in ??? ?? ??? ????? ? ?????
3) ??? ?? ??? ??? ????
4) URL ?? ???? ????(q)? ????? (???? ?? ?? ??)
PHP ??
? JavaScript? ?? ??? ?? ???? "?? ??? PHP ?????. poll_vote.php":
<?php
$vote = htmlspecialchars($_REQUEST['vote']);
// 獲取文件中存儲的數(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)? ?????.
???? ???? ??? ????.
3||4
? ?? ??? "?"? ?? ?? ?? ?????. " ?? ? ?? ??? "??" ?? ?? ?????.
??: ? ????? ? ??? ??? ??? ? ??? ???? ???. ? ??(PHP) ??? ?? ??? ?????? ???? ???.
