Detailed explanation of Ajax and $.ajax examples
This time I will bring you a detailed explanation of Ajax and $.ajax examples. What are the precautions when using Ajax and $.ajax. The following is a practical case, let’s take a look.
Example 1 (Basic creation format of Ajax request):
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Ajax练习（GET，不考虑浏览器兼容性）</title>
<script type="text/JavaScript">
function doRequest() {
//不考虑浏览器兼容性问题
var xmlHttp = new XMLHttpRequest();
//打开一个与Http服务器的连接
xmlHttp.open("GET", "Default.aspx", true);
//与服务器端交互
xmlHttp.send(null);
//监听服务器端响应状态的改变事件
xmlHttp.onreadystatechange = function () {
//客户端与服务器端交互完成
if (xmlHttp.readyState == 4) {
//服务器端返回Http状态码：200表示请求成功,404未找到,403错误
if (xmlHttp.status == 200) {
//获得服务器端资源
var result = xmlHttp.responseText;
alert(result);
}
}
}
}
</script>
</head>
<body>
<form id="form1" runat="server">
<p>
<input type="button" id="btn" value="异步请求" onclick="doRequest()" />
</p>
</form>
</body>
</html><head runat="server">
<title>AjaxDemo实例</title>
<script src="JS/jQuery-1.4.1-vsdoc.js" type="text/javascript"></script>
<script type="text/javascript">
//使用Ajax读取浏览器的工作内容
function readRequest() {
//不考虑浏览器的兼容性问题
var xmlhttp = new XMLHttpRequest();
//打开一个与服务器相关的链接
//发送请求
//请求的方式（获取/发送），请求页面，是否异步
xmlhttp.open("GET", "AjaxDemo.aspx", true);
//发送数据
xmlhttp.send(null);
//接受服务器返回结果
xmlhttp.onreadystatechange = function() {
//请求完成
if (xmlhttp.readyState == 4) {
//链接成功
if (xmlhttp.status == 200) {
//输出浏览器的内容
var result = xmlhttp.responseText;
alert(result);
window.alert("读取浏览器的内容成功！");
}
}
};
};
function btn_Click() {
var http = new ActiveXObject("Microsoft.XMLHTTP");
//或者使用这一句创建 var xmlhttp = new XMLHttpRequest();
if (!http) {
alert("创建xmlhttp对象异常！");
return false;
}
http.open("POST", "AjaxDemo.ashx", false);
http.onreadystatechange = function() {
if (http.readyState == 4) {
//链接成功
if (http.status == 200) {
alert(http.responseText);
document.getElementById("Text1").value = http.responseText;
} else {
window.alert("Ajax服务器返回错误！");
}
}
};
http.send();
};
</script>
</head>
<body>
<form id="form1" runat="server">
<p>
<input id="Button1" type="button" value="使用Ajax读取浏览器的内容" onclick="readRequest()" />
<br/>
<input id="Text1" type="text" />
<input id="Button2" type="button" value="获取当前时间" onclick="btn_Click()"/>
</p>
</form>
</body>Example 2 (see attachment)
Consider browser compatibility for Ajax request processing and obtain background xml file content.
Example 3 (see attachment)
Use $.Ajax to obtain background reading xml file content information.
function readXML1() {
//创建XML对象
var xmldom = new ActiveXObject("Microsoft.XMLDOM");
//设置为异步
xmldom.async = "false";
//加载需要读取的XML文档
xmldom.load("XML1.xml");
info = "";
//需要读取的根节点
var node = xmldom.selectNodes("student");
//依次读取其中的内容
info = node[0].childNodes[0].nodeTypedValue + " <br/>" + node[0].childNodes[1].nodeTypedValue+ "<br/>" + node[0].childNodes[2].nodeTypedValue;
document.getElementById("xmlmsg").innerHTML = info;
}; function readXML2() {
//实例化xml对象
var xml = new ActiveXObject("Microsoft.XMLDOM");
//异步设置
xml.async = "false";
//加载需要读取的XML文档
xml.load("XML2.xml");
info = "";
//选择需要读取的对象名称
var fnode = xml.documentElement.selectNodes("people");
//循环输出文档的内容
for (var i = 0; i < fnode.length; i++) {
for (var j = 0; j < fnode[i].childNodes.length; j++) {
info += fnode[i].childNodes[j].text + "<br/>";
}
}
document.getElementById("xmlmsg").innerHTML = info;
};I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the php Chinese website!
Recommended reading:
Summary of the advantages and disadvantages of Ajax
##Detailed explanation of the interaction between Ajax() and the background
Summary of three methods for Ajax to achieve cross-domain access
The above is the detailed content of Detailed explanation of Ajax and $.ajax examples. For more information, please follow other related articles on the PHP Chinese website!
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
AI Hentai Generator
Generate AI Hentai for free.
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
1382
52
Detailed explanation of obtaining administrator rights in Win11
Mar 08, 2024 pm 03:06 PM
Windows operating system is one of the most popular operating systems in the world, and its new version Win11 has attracted much attention. In the Win11 system, obtaining administrator rights is an important operation. Administrator rights allow users to perform more operations and settings on the system. This article will introduce in detail how to obtain administrator permissions in Win11 system and how to effectively manage permissions. In the Win11 system, administrator rights are divided into two types: local administrator and domain administrator. A local administrator has full administrative rights to the local computer
Detailed explanation of division operation in Oracle SQL
Mar 10, 2024 am 09:51 AM
Detailed explanation of division operation in OracleSQL In OracleSQL, division operation is a common and important mathematical operation, used to calculate the result of dividing two numbers. Division is often used in database queries, so understanding the division operation and its usage in OracleSQL is one of the essential skills for database developers. This article will discuss the relevant knowledge of division operations in OracleSQL in detail and provide specific code examples for readers' reference. 1. Division operation in OracleSQL
How to solve the 403 error encountered by jQuery AJAX request
Feb 20, 2024 am 10:07 AM
Title: Methods and code examples to resolve 403 errors in jQuery AJAX requests. The 403 error refers to a request that the server prohibits access to a resource. This error usually occurs because the request lacks permissions or is rejected by the server. When making jQueryAJAX requests, you sometimes encounter this situation. This article will introduce how to solve this problem and provide code examples. Solution: Check permissions: First ensure that the requested URL address is correct and verify that you have sufficient permissions to access the resource.
How to solve jQuery AJAX request 403 error
Feb 19, 2024 pm 05:55 PM
jQuery is a popular JavaScript library used to simplify client-side development. AJAX is a technology that sends asynchronous requests and interacts with the server without reloading the entire web page. However, when using jQuery to make AJAX requests, you sometimes encounter 403 errors. 403 errors are usually server-denied access errors, possibly due to security policy or permission issues. In this article, we will discuss how to resolve jQueryAJAX request encountering 403 error
Detailed explanation of the role and usage of PHP modulo operator
Mar 19, 2024 pm 04:33 PM
The modulo operator (%) in PHP is used to obtain the remainder of the division of two numbers. In this article, we will discuss the role and usage of the modulo operator in detail, and provide specific code examples to help readers better understand. 1. The role of the modulo operator In mathematics, when we divide an integer by another integer, we get a quotient and a remainder. For example, when we divide 10 by 3, the quotient is 3 and the remainder is 1. The modulo operator is used to obtain this remainder. 2. Usage of the modulo operator In PHP, use the % symbol to represent the modulus
Detailed explanation of the linux system call system() function
Feb 22, 2024 pm 08:21 PM
Detailed explanation of Linux system call system() function System call is a very important part of the Linux operating system. It provides a way to interact with the system kernel. Among them, the system() function is one of the commonly used system call functions. This article will introduce the use of the system() function in detail and provide corresponding code examples. Basic Concepts of System Calls System calls are a way for user programs to interact with the operating system kernel. User programs request the operating system by calling system call functions
How to solve the problem of jQuery AJAX error 403?
Feb 23, 2024 pm 04:27 PM
How to solve the problem of jQueryAJAX error 403? When developing web applications, jQuery is often used to send asynchronous requests. However, sometimes you may encounter error code 403 when using jQueryAJAX, indicating that access is forbidden by the server. This is usually caused by server-side security settings, but there are ways to work around it. This article will introduce how to solve the problem of jQueryAJAX error 403 and provide specific code examples. 1. to make
PHP and Ajax: Building an autocomplete suggestion engine
Jun 02, 2024 pm 08:39 PM
Build an autocomplete suggestion engine using PHP and Ajax: Server-side script: handles Ajax requests and returns suggestions (autocomplete.php). Client script: Send Ajax request and display suggestions (autocomplete.js). Practical case: Include script in HTML page and specify search-input element identifier.
