Example 1: An example of using Ajax to dynamically obtain time.
HTML code:
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<script type="text/javascript" src="Scripts/jquery-1.7.1.js"></script>
<script type="text/javascript" src="Scripts/jwy.js"></script>
</head>
<body>
<form id="form1" runat="server">
<div>
<input type="text" name="textbox" id="text1" />
<input type="button" name="button" id="Button1" value="显示时间" onclick="btnclick()" />
</div>
</form>
</body>
</html>
Create a "general handler" to handle foreground requests and return the current system time:
Handler.ashx
<%@ WebHandler Language="C#" Class="Handler" %>
using System;
using System.Web;
using System.Linq;
using System.Collections.Generic;
using System.Text;
public class Handler : IHttpHandler {
public void ProcessRequest (HttpContext context) {
context.Response.ContentType = "text/plain";
context.Response.Write(ShowTime());
}
public bool IsReusable {
get {
return false;
}
}
public static string ShowTime()
{
return DateTime.Now.ToString();
}
}
js code:
function btnclick() {
var httprequest = null;
// 初始化XMLHttpRequest对象
if (window.XMLHttpRequest) {
// Firefox等现代浏览器中的XMLHttpRequest对象创建
httprequest = new XMLHttpRequest();
}
else if (window.ActiveXObject) {
// IE中的XMLHttpRequest对象创建
httprequest = new ActiveXObject("Microsoft.XMLHTTP");
}
if (!httprequest) {
alert("创建httprequest对象出现异常！");
}
httprequest.open("POST", "Handler.ashx", true);
//httprequest向handler发送post请求，最后参数是设定是否为异步请求,true为异步，false为同步
httprequest.onreadystatechange = function () {
//指定onreadystatechange事件句柄对应的函数
if (httprequest.readyState == 4) {
//4代表服务器返回完成
if (httprequest.status == 200) {
//200代表成功了
document.getElementById("text1").value = httprequest.responseText;
//responsetext表示服务器返回的文本,还有一种方式是responseXML是为了获取服务器返回的xml
}
else {
alert("AJAX服务器返回错误！");
}
}
}
httprequest.send();
//在这里才真正的向服务器端发送请求
}
We use jquery to make the front-end js code very simple:
JS code based on jquery:
Note: The HTML code needs to remove the onclick event of the button, because we use event binding directly in js.
$(document).ready(function () {
//button1绑定事件
$("#Button1").bind("click", function () {
$.ajax({
url: "Handler.ashx",
type: "POST",
success: function (data) {
//$("#text1").val(data);
document.getElementById("text1").value = data;
}
});
});
});
I have to say that jquery is "simple but not simple"...
$.ajax in jquery integrates get and post methods, and the default is get.
If you use POST directly, the code is simpler
$(document).ready(function () {
//button1绑定事件
$("#Button1").bind("click", function () {
$.post("Handler.ashx", function (data) {
document.getElementById("text1").value = data;
});
});
});
Example 2:
1. XMLHttpRequest implementation to obtain data
Do not use jQuery to achieve the method of obtaining content without refreshing the page. We use XMLHttpRequest native code to implement it here;
js code is as follows:
//1.获取a节点，并为其添加Oncilck响应函数
document.getElementsByTagName("a")[0].onclick = function(){
//3、创建一个XMLHttpRequest();
var request = new XMLHttpRequest();
//4、准备发送请求的数据url
var url = this.href;
var method = "GET";
//5、调用XMLHttpRequest对象的open方法
request.open(method,url);
//6、调用XMLHttpRequest对象的send方法
request.send(null);
//7、为XMLHttpRequest对象添加onreadystatechange 响应函数
request.onreadystatechange = function(){
//8、判断响应是否完成：XMLHttpRequest 对象的readystate的属性值为4的时候
if(request.readyState == 4){
//9、在判断响应是否可用：XMLHttpRequest 对象status 属性值为200
if(request.status == 200){
//10、响应结果
alert(request.responseText);
}
}
}
//2、取消a节点的额默认行为
return false;
}
Insert HTML code:
<a href = "hello.txt">点击获取文本内容</a>
2. jQuery implements ajax to obtain information
This example is to dynamically obtain data from the background to change the content of the drop-down button;
js code is as follows:
function bindCarteam0(){
//通过URL请求数据
var URL = <select:link page="/xiaoshouwl.do?method=getCarteamList"/>;
$.ajax({
url:URL,
type:'GET',
dataType: "json",
success:function(html){
var str="<option value='-1'>全部</option>";
for(var i=0;i<html.length;i++){
str+="<option value='"+html[i].id+"'>"+html[i].name+"</option>";
}
$("#carteam_code").empty().html(str);
}
});
}
HTML code is as follows:
<select:select property="carteam_code" styleId="carteam_code" style="width:150px">
<select:option value="-1">全部</select:option>
</select:select>
There are two types of types: get and post;
The amount of data that post can transmit is relatively large, and get has a byte limit;
Replace String Characters in JavaScriptMar 11, 2025 am 12:07 AMDetailed explanation of JavaScript string replacement method and FAQ This article will explore two ways to replace string characters in JavaScript: internal JavaScript code and internal HTML for web pages. Replace string inside JavaScript code The most direct way is to use the replace() method: str = str.replace("find","replace"); This method replaces only the first match. To replace all matches, use a regular expression and add the global flag g: str = str.replace(/fi
8 Stunning jQuery Page Layout PluginsMar 06, 2025 am 12:48 AMLeverage jQuery for Effortless Web Page Layouts: 8 Essential Plugins jQuery simplifies web page layout significantly. This article highlights eight powerful jQuery plugins that streamline the process, particularly useful for manual website creation
Build Your Own AJAX Web ApplicationsMar 09, 2025 am 12:11 AMSo here you are, ready to learn all about this thing called AJAX. But, what exactly is it? The term AJAX refers to a loose grouping of technologies that are used to create dynamic, interactive web content. The term AJAX, originally coined by Jesse J
How do I create and publish my own JavaScript libraries?Mar 18, 2025 pm 03:12 PMArticle discusses creating, publishing, and maintaining JavaScript libraries, focusing on planning, development, testing, documentation, and promotion strategies.
Load Box Content Dynamically using AJAXMar 06, 2025 am 01:07 AMThis tutorial demonstrates creating dynamic page boxes loaded via AJAX, enabling instant refresh without full page reloads. It leverages jQuery and JavaScript. Think of it as a custom Facebook-style content box loader. Key Concepts: AJAX and jQuery
10 jQuery Fun and Games PluginsMar 08, 2025 am 12:42 AM10 fun jQuery game plugins to make your website more attractive and enhance user stickiness! While Flash is still the best software for developing casual web games, jQuery can also create surprising effects, and while not comparable to pure action Flash games, in some cases you can also have unexpected fun in your browser. jQuery tic toe game The "Hello world" of game programming now has a jQuery version. Source code jQuery Crazy Word Composition Game This is a fill-in-the-blank game, and it can produce some weird results due to not knowing the context of the word. Source code jQuery mine sweeping game
How to Write a Cookie-less Session Library for JavaScriptMar 06, 2025 am 01:18 AMThis JavaScript library leverages the window.name property to manage session data without relying on cookies. It offers a robust solution for storing and retrieving session variables across browsers. The library provides three core methods: Session
jQuery Parallax Tutorial - Animated Header BackgroundMar 08, 2025 am 12:39 AMThis tutorial demonstrates how to create a captivating parallax background effect using jQuery. We'll build a header banner with layered images that create a stunning visual depth. The updated plugin works with jQuery 1.6.4 and later. Download the
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
EditPlus Chinese cracked version
Small size, syntax highlighting, does not support code prompt function
Safe Exam Browser
Safe Exam Browser is a secure browser environment for taking online exams securely. This software turns any computer into a secure workstation. It controls access to any utility and prevents students from using unauthorized resources.
Dreamweaver CS6
Visual web development tools
SublimeText3 Linux new version
SublimeText3 Linux latest version
mPDF
mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),
