This article mainly introduces the relevant information for sharing the three parsing modes of ajax. Friends who need it can refer to it
1. JSON format in Ajax
html code:
<html>
<body>
<input type="button" value="Ajax" id="btn">
<script>
var btn = document.getElementById("btn");
btn.onclick = function(){
var xhr = getXhr();
xhr.open("post","10.php");
xhr.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
/*
* 在客户端如何构建JSON格式
* * 构建符合JSON格式的字符串
*/
var user = '{"name":"zhangwuji","pwd":"123456"}';
xhr.send("user="+user);
xhr.onreadystatechange = function(){
if(xhr.readyState==4&&xhr.status==200){
var data = xhr.responseText;
/*
* 使用eval()函数进行转换
* * 使用"()"将其包裹,eval()函数强制将其转换为JSON格式(javascript代码)
* * 不使用"()"将其包裹,eval()函数将其识别为一个空的代码块
*/
var json = eval("("+data+")");
console.log(json);
}
}
}
function getXhr(){
var xhr = null;
if(window.XMLHttpRequest){
xhr = new XMLHttpRequest();
}else{
xhr = new ActiveXObject("Microsoft.XMLHttp");
}
return xhr;
}
</script>
</body>
</html>
PHP code:
<?php
// 接收客户端发送的请求数据
$user = $_POST['user'];
// 就是一个JSON格式的string字符串
//var_dump($user);
$json_user = json_decode($user,true);
//var_dump($json_user['name']);
$json = '{"a":1,"b":2,"c":3,"d":4,"e":5}';
//var_dump(json_decode($json));
// 响应数据符合JSON格式的字符串
// 1. 手工方式构建
//echo '{"name":"zhouzhiruo","pwd":"123456"}';
// 2. 使用json_encode()函数
echo json_encode($json_user);
?>
2 XML format in Ajax
html page:
<html>
<body>
<input type="button" value="Ajax" id="btn">
<script>
var btn = document.getElementById("btn");
btn.onclick = function(){
// 实现Ajax的异步交互
var xhr = getXhr();
xhr.open("post","07.php");
xhr.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
/*
* 如何构建符合XML格式的请求数据
* * 注意
* * 请求数据的格式 - key=value 不能改变的
* * 将value值构建成符合XML格式的数据
* * 数据类型 - 字符串(string)
* * 格式符合XML的语法要求
* * 编写注意
* * 定义变量 - 专门构建XML格式的数据
* * 在send()方法进行拼串
*/
var user = "<user><name>zhangwuji</name><pwd>123456</pwd></user>";
xhr.send("user="+user);
xhr.onreadystatechange = function(){
if(xhr.readyState==4&&xhr.status==200){
// 接收服务器端的响应数据
var xmlDoc = xhr.responseXML;
var nameEle = xmlDoc.getElementsByTagName("name")[0];
var txtEle = nameEle.childNodes[0];
console.log(txtEle.nodeValue);
}
}
}
function getXhr(){
var xhr = null;
if(window.XMLHttpRequest){
xhr = new XMLHttpRequest();
}else{
xhr = new ActiveXObject("Microsoft.XMLHttp");
}
return xhr;
}
</script>
</body>
</html>
PHP page code:
<?php // 接收客户端发送的请求数据 $user = $_POST['user'];//符合XML格式要求的string类型 //var_dump($user); // 创建DOMDocument对象 $doc = new DOMDocument(); // 调用loadXML()方法 $result = $doc->loadXML($user); //var_dump($doc); // 如何构建符合XML格式的数据 /* 修改响应头的Content-Type值为"text/xml" header('Content-Type:text/xml'); echo $user;// 符合XML格式的string类型 */ header('Content-Type:application/xml'); echo $doc->saveXML(); ?>
三 HTML format in Ajax
HTML page:
<html>
<body>
<select id="province">
<option>请选择</option>
<option>山东省</option>
<option>辽宁省</option>
<option>吉林省</option>
</select>
<select id="city">
<option>请选择</option>
</select>
<script>
/*
* 需要思考哪些事情?
* * 在什么时候执行Ajax的异步请求?
* * 当用户选择具体的省份信息时
*/
// 1. 为id为province元素绑定onchange事件
var provinceEle = document.getElementById("province");
provinceEle.onchange = function(){
// 清空
var city = document.getElementById("city");
var opts = city.getElementsByTagName("option");
for(var z=opts.length-1;z>0;z--){
city.removeChild(opts[z]);
}
if(provinceEle.value != "请选择"){
// 2. 执行Ajax异步请求
var xhr = getXhr();
xhr.open("post","06.php");
xhr.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
xhr.send("provcince="+provinceEle.value);
xhr.onreadystatechange = function(){
if(xhr.readyState==4&&xhr.status==200){
// 接收服务器端的数据内容
var data = xhr.responseText;
// data是字符串,转换为数组
var cities = data.split(",");
for(var i=0;i<cities.length;i++){
var option = document.createElement("option");
var textNode = document.createTextNode(cities[i]);
option.appendChild(textNode);
city.appendChild(option);
}
}
}
}
}
// 定义创建XMLHttpRequest对象的函数
function getXhr(){
var xhr = null;
if(window.XMLHttpRequest){
xhr = new XMLHttpRequest();
}else{
xhr = new ActiveXObject("Microsoft.XMLHttp");
}
return xhr;
}
</script>
</body>
</html>
php page:
##
<?php
// 用于处理客户端请求二级联动的数据
// 1. 接收客户端发送的省份信息
$province = $_POST['provcince'];
// 2. 判断当前的省份信息,提供不同的城市信息
switch ($province){
case '山东省':
echo '青岛市,济南市,威海市,日照市,德州市';
break;
case '辽宁省':
echo '沈阳市,大连市,铁岭市,丹东市,锦州市';
break;
case '吉林省':
echo '长春市,松原市,吉林市,通化市,四平市';
break;
}
// 服务器端响应的是字符串
?>
The above is what I compiled for everyone. I hope it will be helpful to everyone in the future. help. Related articles:
Implementing ajax cross-domain request based on iframe to obtain ajax data in the web page
Ajax sending and receiving requests
Ajax asynchronous loading image example analysis
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