Home Web Front-end JS Tutorial About the method of ajax traversing xml document

About the method of ajax traversing xml document

Jul 02, 2018 pm 04:33 PM
ajax xml Traverse

This article mainly introduces the method of ajax traversing XML documents. It analyzes the implementation techniques of jsp combined with Ajax traversing XML documents through examples. It has certain reference value. Friends who need it can refer to it.

Examples of this article Ajax method for traversing xml documents. Share it with everyone for your reference. The specific analysis is as follows:

The XMLHttpRequest object provides two attributes that can be used to access the server response. The first attribute, responseText, provides the response as a string, and the second attribute, responseXML, provides the response as an XML object. Some simple use cases are suitable for getting the response by simple text, such as displaying the response in an alert box, or the response is just a word indicating success or failure
The example in the previous was obtained from the XMLHttpRequest object The server responds and gets the response as text using the responseText property of the XMLHttpRequest object.
This time we will use the responseXML attribute of the XMLHttpRequest object to obtain the result as an XML document. In this way, we can use the W3C DOM method to traverse the XML document. (The previous article has more or less talked about DOM, so I won’t repeat it here)

OK, let’s look at the example.

First of all, there is a piece of XML document code (parseXML.xml) as follows:

parseXML.xml is as follows:

<?xml version="1.0" encoding="UTF-8"?>
<states>
<north>
<state>Minnesota</state>
<state>Iowa</state>
<state>North Dakota</state>
</north>
<south>
<state>Texas</state>
<state>Oklahoma</state>
<state>Louisiana</state>
</south>
<east>
<state>New York</state>
<state>North Carolina</state>
<state>Massachusetts</state>
</east>
<west>
<state>California</state>
<state>Oregon</state>
<state>Nevada</state>
</west>
</states>
Copy after login

MyJsp.jsp is as follows:

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP &#39;MyJsp.jsp&#39; starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0"> 
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<script type="text/javascript">
var flg=false;
var requestType = "";
//得到XMLHttpRequest对象
function newXMLHttpRequest() {
var xmlreq = false;
if (window.XMLHttpRequest) {
xmlreq = new XMLHttpRequest();
} else if (window.ActiveXObject) {
try {
xmlreq = new ActiveXObject("Msxml2.XMLHTTP");
} catch (e1) {
try {
xmlreq = new ActiveXObject("Microsoft.XMLHTTP");
} catch (e2) {}
}
}
return xmlreq;
}
function startRequest(requestedList){
requestType=requestedList;
flg=newXMLHttpRequest();
//当XMLHttpRequest对象在请求过程中间状态改变的时候
//回来调用handleStateChange方法
flg.onreadystatechange = handleStateChange;
flg.open("GET", "parseXML.xml", true);
flg.send(null);
}
//处理函数
function handleStateChange(){
if(flg.readyState==4){
if(flg.status==200){
if(requestType=="north"){
listNorthStates();
}else if(requestType=="all"){
listAllStates();
}if(requestType=="south"){
listSouthStates();
}
}
}
}
//用于显示NorthStates方法
function listNorthStates(){
var xmlDoc=flg.responseXML;
var northNode=xmlDoc.getElementsByTagName("north")[0];
var northStates=northNode.getElementsByTagName("state");
outputList("North States",northStates);
}
//用于显示SouthStates方法
function listSouthStates(){
var xmlDoc=flg.responseXML;
var SouthNode=xmlDoc.getElementsByTagName("south")[0];
var SouthStates=SouthNode.getElementsByTagName("state");
outputList("South States",SouthStates);
}
//用于显示AllStates方法
function listAllStates(){
var xmlDoc=flg.responseXML;
var allStates=xmlDoc.getElementsByTagName("state");
outputList("All States in Document", allStates);
}
//输出元素并显示于提示框中
function outputList(title,states){
var out=title;
var currState=null;
for(var i=0;i<states.length;i++){
currState=states;
out=out+"\n-"+currState.childNodes[0].nodeValue;
}
alert(out);
}
</script>
<body>
<form action="#">
<input type="button" value="View All Listed States"
  onclick="startRequest(&#39;all&#39;);"/><br>
<input type="button" value="View All Listed Northern States"
  onclick="startRequest(&#39;north&#39;);"/><br>
<input type="button" value="View All Listed Southern States"
  onclick="startRequest(&#39;south&#39;);"/>
</form>
</body>
</html>
Copy after login

The above is the entire content of this article. I hope it will be helpful to everyone's study. For more related content, please pay attention to the PHP Chinese website!

Related recommendations:

Introduction to Ajax’s get and post requests

AJAX uses post to send data in xml format and accept it data

The above is the detailed content of About the method of ajax traversing xml document. For more information, please follow other related articles on the PHP Chinese website!

Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

Hot Topics

Java Tutorial
1653
14
PHP Tutorial
1251
29
C# Tutorial
1224
24
Can I open an XML file using PowerPoint? Can I open an XML file using PowerPoint? Feb 19, 2024 pm 09:06 PM

Can XML files be opened with PPT? XML, Extensible Markup Language (Extensible Markup Language), is a universal markup language that is widely used in data exchange and data storage. Compared with HTML, XML is more flexible and can define its own tags and data structures, making the storage and exchange of data more convenient and unified. PPT, or PowerPoint, is a software developed by Microsoft for creating presentations. It provides a comprehensive way of

PHP and Ajax: Building an autocomplete suggestion engine 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.

How to solve the 403 error encountered by jQuery AJAX request 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 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

Java how to loop through a folder and get all file names Java how to loop through a folder and get all file names Mar 29, 2024 pm 01:24 PM

Java is a popular programming language with powerful file handling capabilities. In Java, traversing a folder and getting all file names is a common operation, which can help us quickly locate and process files in a specific directory. This article will introduce how to implement a method of traversing a folder and getting all file names in Java, and provide specific code examples. 1. Use the recursive method to traverse the folder. We can use the recursive method to traverse the folder. The recursive method is a way of calling itself, which can effectively traverse the folder.

How to solve the problem of jQuery AJAX error 403? 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

How to get variables from PHP method using Ajax? How to get variables from PHP method using Ajax? Mar 09, 2024 pm 05:36 PM

Using Ajax to obtain variables from PHP methods is a common scenario in web development. Through Ajax, the page can be dynamically obtained without refreshing the data. In this article, we will introduce how to use Ajax to get variables from PHP methods, and provide specific code examples. First, we need to write a PHP file to handle the Ajax request and return the required variables. Here is sample code for a simple PHP file getData.php:

How to use PHP functions to process XML data? How to use PHP functions to process XML data? May 05, 2024 am 09:15 AM

Use PHPXML functions to process XML data: Parse XML data: simplexml_load_file() and simplexml_load_string() load XML files or strings. Access XML data: Use the properties and methods of the SimpleXML object to obtain element names, attribute values, and subelements. Modify XML data: add new elements and attributes using the addChild() and addAttribute() methods. Serialized XML data: The asXML() method converts a SimpleXML object into an XML string. Practical example: parse product feed XML, extract product information, transform and store it into a database.

See all articles