AJAX级联下拉框的简单实现案例
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AJAX级联下拉框的简单实现案例
需要的JAVA类 复制代码 代码如下: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 充当业务层供ajax调用 <%@ 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
(2)divmenu.jsp <%@ page contentType="text/html; charset=gb2312"%> <%@ page import="com.ajaxlab.ajax.*"%> <% ClassService service = new ClassService(); ProductClass[] classes = service.getAllClass1(); %> Insert title here
