這篇文章主要介紹“AJAX級聯(lián)下拉框的實(shí)現(xiàn)方法”,在日常操作中,相信很多人在AJAX級聯(lián)下拉框的實(shí)現(xiàn)方法問題上存在疑惑,小編查閱了各式資料,整理出簡單好用的操作方法,希望對大家解答”AJAX級聯(lián)下拉框的實(shí)現(xiàn)方法”的疑惑有所幫助!接下來,請跟著小編一起來學(xué)習(xí)吧!
目前創(chuàng)新互聯(lián)建站已為上千余家的企業(yè)提供了網(wǎng)站建設(shè)、域名、雅安服務(wù)器托管、網(wǎng)站托管維護(hù)、企業(yè)網(wǎng)站設(shè)計(jì)、管城網(wǎng)站維護(hù)等服務(wù),公司將堅(jiān)持客戶導(dǎo)向、應(yīng)用為本的策略,正道將秉承"和諧、參與、激情"的文化,與客戶和合作伙伴齊心協(xié)力一起成長,共同發(fā)展。需要的JAVA類
復(fù)制代碼 代碼如下:
package com.ajaxlab.ajax;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import org.jdom.Document;
import org.jdom.Element;
import org.jdom.input.SAXBuilder;
import com.ajaxlab.ajax.ProductClass;
public class ClassService {
private Document dom;
public ClassService(){
try{
SAXBuilder builder=new SAXBuilder();
this.dom=builder.build(ClassService.class.getResource("product.xml"));
}catch(Exception e){
e.printStackTrace();
}
}
public ProductClass[] getAllClass1(){
Collection products=new ArrayList();
Iterator iterator=this.dom.getRootElement().getChildren().iterator();
do{
Element element=(Element)iterator.next();
ProductClass product=new ProductClass(element.getAttributeValue("id"),
element.getAttributeValue("className"));
products.add(product);
}while(iterator.hasNext());
return (ProductClass[])products.toArray(new ProductClass[0]);
}
public ProductClass[] getAllClass2ById(String class1Id){
Collection products=new ArrayList();
Element classElement=null;
Iterator iterator=this.dom.getRootElement().getChildren().iterator();
do{
Element element=(Element)iterator.next();
if(class1Id.equalsIgnoreCase(element.getAttributeValue("id"))){
classElement=element;
break;
}
}while(iterator.hasNext());
if(classElement!=null){
Iterator iter=classElement.getChildren().iterator();
do{
Element element=(Element)iter.next();
ProductClass product=new ProductClass(element.getAttributeValue("id"),
element.getAttributeValue("className"));
products.add(product);
}while(iter.hasNext());
return (ProductClass[])products.toArray(new ProductClass[0]);
}
else{
return null;
}
}
public ProductClass[] getAllClass3ById(String class1Id,String class2Id) {
Collection products = new ArrayList();
Element class1Element = null;
Element class2Element = null;
Iterator iterator = this.dom.getRootElement().getChildren().iterator();
do {
Element element = (Element)iterator.next();
if(class1Id.equalsIgnoreCase(element.getAttributeValue("id"))) {
class1Element = element;
break;
}
}while(iterator.hasNext());
if(class1Element!=null) {
Iterator iter = class1Element.getChildren().iterator();
do {
Element element = (Element)iter.next();
if(class2Id.equalsIgnoreCase(element.getAttributeValue("id"))) {
class2Element = element;
break;
}
}while(iter.hasNext());
if(class2Element!=null) {
Iterator iter2 = class2Element.getChildren().iterator();
do {
Element element = (Element)iter2.next();
ProductClass product = new ProductClass(element.getAttributeValue("id"),element.getAttributeValue("className"));
products.add(product);
}while(iter2.hasNext());
}
return (ProductClass[])products.toArray(new ProductClass[0]);
}
else return null;
}
}
JSP:
(1)getClass.jsp 充當(dāng)業(yè)務(wù)層供ajax調(diào)用
<%@ page contentType="text/html; charset=gb2312"%>
<%@ page import="com.ajaxlab.ajax.*"%>
<%
String class1Id = request.getParameter("class1Id");
String class2Id = request.getParameter("class2Id");
if("".equals(class1Id)) class1Id = null;
if("".equals(class2Id)) class2Id = null;
ClassService service = new ClassService();
if((class1Id!=null)&&(class2Id==null)) {
ProductClass[] classes = service.getAllClass2ById(class1Id);
if(classes!=null) {
for(int i=0;i
}
}
}
else if((class1Id!=null)&&(class1Id!=null)) {
ProductClass[] classes = service.getAllClass3ById(class1Id,class2Id);
if(classes!=null) {
for(int i=0;i
}
}
}
%>
(2)divmenu.jsp
<%@ page contentType="text/html; charset=gb2312"%>
<%@ page import="com.ajaxlab.ajax.*"%>
到此,關(guān)于“AJAX級聯(lián)下拉框的實(shí)現(xiàn)方法”的學(xué)習(xí)就結(jié)束了,希望能夠解決大家的疑惑。理論與實(shí)踐的搭配能更好的幫助大家學(xué)習(xí),快去試試吧!若想繼續(xù)學(xué)習(xí)更多相關(guān)知識,請繼續(xù)關(guān)注創(chuàng)新互聯(lián)網(wǎng)站,小編會(huì)繼續(xù)努力為大家?guī)砀鄬?shí)用的文章!