Ajax and PHP example analysis
This article mainly shares with you the analysis of Ajax and PHP examples. I hope the code in this article can help you.
Form:
用户名:<input type="text" id="username" value="" /> 密码:<input type="password" id="password" value="" /> <br /><br /> <input type="submit" id="update" name="提交" />
JavaScript Ajax request
var update = document.getElementById("update");
update.onclick = function(){
var username = document.getElementById("username").value;
var pass = document.getElementById("password").value;
//步骤1:创建Ajax对象
if(window.XMLHttpRequest){
var ajax = new XMLHttpRequest();//在主流浏览器下创建Ajax对象
}else{
var ajax = new ActiveXObject("Microsoft.xmlhttp");//在IE浏览器下创建Ajax对象
}
//步骤2:开启ajax
/**************get方式***********/
var url = "http://localhost/test/get.php?username="+username+"&password="+pass;
ajax.open("GET",url,true);
//步骤3:发送数据(请求)
ajax.send();
/******post方式*******/
// ajax.open("POST","dealDate.php",true);
// //请求过程中数据的编码格式(POST专用操作)
// ajax.setRequestHeader("Content-type","application/x-www-form-urlencoded");
// var parameter = "username="+username+"&password="+pass;
// ajax.send(parameter);
//步骤4:等待接收数据
/*Ajax对象在执行过程中伴随着状态的切换,共存有5中状态的切换
0.代表Ajax对象的创建,但是未调用open方法
1.代表Ajax对象调用open方法,但是未调用send方法
2.代表Ajax对象调用send方法,但是还没有接收到数据
3.代表Ajax对象正在接收数据
4.代表Ajax对象接收数据完成
*/
ajax.onreadystatechange = function(){
if(ajax.readyState == 4){
if(ajax.status >= 200 && ajax.status < 300 || ajax.status == 304){
//输出服务器返回的数据,但是该数据必须是通过echo输出的文本数据
var p = document.createElement("p");
p.innerHTML = ajax.responseText;
document.body.appendChild(p);
}
}
}
}Background PHP received data:
<?php
header("Content-type:text/html;charset=utf-8");//显示中文
$user = $_GET["username"];
$password = $_GET["password"];
echo "{$user}".":"."{$password}";
?>Related recommendations:
Example analysis of ajax and php to achieve refresh-free verification of mobile phone number
Ajax and PHP regular expression verification form and verification code
Through AJAX and PHP, submit JQuery Mobile form (two articles)
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