用Jquery+Ajax+xml制作三级联动效果

本文主要介绍使用 Jquery+Ajax+xml，首先需要一个包含我国所有地图信息的xml文档。

此处选用的xml文档(共1000多行)主要结构如下：

<?xml version="1.0" encoding="utf-8"?>
<area Country="China">
 <province ID="1" provinceID="110000" province="北京市">
  <City CityID="110100" City="市辖区">
   <Piecearea PieceareaID="110101" Piecearea="东城区" />
   <Piecearea PieceareaID="110102" Piecearea="西城区" />
   <Piecearea PieceareaID="110103" Piecearea="崇文区" />
   <Piecearea PieceareaID="110104" Piecearea="宣武区" />
   <Piecearea PieceareaID="110105" Piecearea="朝阳区" />
   <Piecearea PieceareaID="110106" Piecearea="丰台区" />
   <Piecearea PieceareaID="110107" Piecearea="石景山区" />
   <Piecearea PieceareaID="110108" Piecearea="海淀区" />
   <Piecearea PieceareaID="110109" Piecearea="门头沟区" />
   <Piecearea PieceareaID="110111" Piecearea="房山区" />
   <Piecearea PieceareaID="110112" Piecearea="通州区" />
   <Piecearea PieceareaID="110113" Piecearea="顺义区" />
   <Piecearea PieceareaID="110114" Piecearea="昌平区" />
   <Piecearea PieceareaID="110115" Piecearea="大兴区" />
   <Piecearea PieceareaID="110116" Piecearea="怀柔区" />
   <Piecearea PieceareaID="110117" Piecearea="平谷区" />
  </City>
<province>

制作对应的表单，根据设置选择省/市的动作:

<h2>地区三级联动菜单</h2>
  省:<select id="province" onchange="showcity()"><option value="0">-请选择-</option></select>
  市:<select id="city" onchange="showdistrict()"><option value="0">-请选择-</option></select>
  地区:<select id="district"><option value="0">-请选择-</option></select>

以下是JS代码行

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