本篇文章主要是對AJAX級聯下拉框的簡單實現案例進行了介紹,需要的朋友可以過來參考下,希望對大家有所幫助
需要的JAVA類 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; } } <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE class SYSTEM "product.dtd" > <class> <class1 className="電腦配件" id="1"> <class2 className="內存" id="1"> <class3 id="1" className="kingmax"></class3> <class3 id="2" className="kingston"></class3> <class3 id="3" className="samsung"></class3> <class3 id="4" className="hydadi"></class3> <class3 id="5" className="ibm"></class3> </class2> <class2 className="硬盤" id="2"> <class3 id="6" className="hithait"></class3> <class3 id="7" className="IBM"></class3> <class3 id="8" className="samsung"></class3> <class3 id="9" className="westdata"></class3> </class2> </class1> <class1 className="食品配件" id="2"> <class2 className="漢堡包" id="1"> <class3 id="1" className="麥當勞"></class3> <class3 id="2" className="肯得基"></class3> <class3 id="3" className="羅傑絲"></class3> </class2> <class2 className="飲料" id="2"> <class3 id="4" className="cocacola"></class3> <class3 id="5" className="sprite"></class3> <class3 id="6" className="coffee"></class3> <class3 id="7" className="water"></class3> </class2> </class1> </class> <?xml version="1.0" encoding="GB2312" ?> <!ELEMENT class (class1+)> <!ELEMENT class1 (class2+)> <!ATTLIST class1 className NMTOKEN #REQUIRED> <!ATTLIST class1 id NMTOKEN #REQUIRED>&nb