PHP+AJAX+POST DEMO[code]
以POST方式传值时，在服务端back.php接受数据时需要设置
xhr.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
否则，接收不到数据。另外还要注意一些编码的问题。
该demo由3个文件组成，前端index.html,ajax.js,服务端back.php
以下是完整代码：
index.html
|
<html>
<head>
<title>ajax post php</title>
<script src="ajax.js" type="text/javascript"></script>
</head>
<body>
<div style="color:red"; id="result">
here the content..
</div>
<form name="form1" id="form1" method="post" action="" onsubmit="send();return false;">
姓名：<input type="text" name="name" value="Linus"/><br/>
标题：<input type="text" name="title" value="Title "/><br/>
内容：<input type="text" name="content" value="Contentsssss"/><br/>
<input type="submit" name="postit" value="Do it"/>
</form>
</body>
</html>
|
ajax.js
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//ajax.js
function send(){
// instantiate XMLHttpRequest object
try
{
xhr = new XMLHttpRequest();
}
catch (e)
{
xhr = new ActiveXObject("Microsoft.XMLHTTP");
}
// handle old browsers
if (xhr == null)
{
alert("Ajax not supported by your browser!");
return;
}
//construct data
var name = document.form1.name.value;
var title = document.form1.title.value;
var content = document.form1.content.value;
var sendData = "name="+escape(name)+"&title="+escape(title)+"&content="+escape(content);
//sendData = encodeURI(sendData);
//alert(sendData);
var url = "back.php";
xhr.onreadystatechange = handle;
xhr.open("post",url,true);
//xhr.setrequestheader("content-length",sendData.length);
xhr.setRequestHeader("cache-control","no-cache");
//without the line the back.php can not receive post data
xhr.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
xhr.send(sendData);
}
function handle(){
// only handle loaded requests
if(xhr.readyState ==4){
if(xhr.status == 200){
document.getElementById('result').innerHTML = xhr.responseText;
}else{
alert("error occured");
}
}
} |
back.php
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<?php
echo $_POST['name']." ---".$_POST['title']."---".$_POST['content']."
";
//sleep(2);
?>
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