AMap.DistrictSearch行政区查询服务插件，提供全国各省、市、县、区的中心点经纬度、行政区边界坐标组、下级行政区等信息。根据行政区边界坐标组可在地图上绘制行政区边界。（本文为原创，并在项目中验证成功。作者：张甫军）
第一步，插件及样式的引用：
<link rel="stylesheet" href="http://cache.amap.com/lbs/static/main1119.css" />
<script src="http://webapi.amap.com/maps?v=1.3&key=7defcebd378d7fcd05dbcb9298d20d2e&plugin=AMap.PolyEditor,AMap.CircleEditor,AMap.MouseTool,AMap.DistrictSearch"></script>
<script type="text/javascript" src="http://cache.amap.com/lbs/static/addToolbar.js"></script>
<script type="text/javascript" src="http://webapi.amap.com/demos/js/liteToolbar.js"></script>
第二步，HTML代码：
<div id="container"></div>
<div id="tip">
省：<select id='province' style="width:100px" onchange='search(this)'></select>
市：<select id='city' style="width:100px" onchange='search(this)'></select>
区：<select id='district' style="width:100px" onchange='search(this)'></select>
街道：<select id='street' style="width:100px" onchange='setCenter(this)'></select>
<input type="button" id="clearMap" onclick="clearMap()" value="清除" />
</div>
第三步，页面CSS样式：
<style type="text/css">
#tip {
background-color: #fff;
padding: 0 10px;
border: 1px solid silver;
box-shadow: 3px 4px 3px 0px silver;
position: absolute;
font-size: 12px;
right: 10px;
top: 5px;
border-radius: 3px;
line-height: 36px;
}
</style>
第四步，JavaScript代码：
- 初始化地图：
var editorTool, district, polygons = [], citycode, map = new AMap.Map("container", {
//resizeEnable: true,
//center: [116.403322, 39.900255],
//zoom: 13
resizeEnable: true,
//center: [116.30946, 39.937629],
zoom: 3
}); - 初始化搜索下拉框：
var citySelect = document.getElementById('city');
var districtSelect = document.getElementById('district');
var areaSelect = document.getElementById('street'); var opts = {
subdistrict: 1,
level: 'city',
showbiz: false
};
district = new AMap.DistrictSearch(opts);
district.search('中国', function (status, result) {
if (status == 'complete') {
getData(result.districtList[0]);
}
});
var mapCenter = null;
var districtObj = {
Center: null,
Bounds: null
};
function getData(data) {
var bounds = data.boundaries;
mapCenter = data.center;
districtObj.Center = data.center;
districtObj.Bounds = bounds == null ? districtObj.Bounds : bounds;
console.log('default1');
if (bounds && '@((int)ElectronicFenceModel.ShapeType.District)' == '@((int)shapeType)') {
for (var i = 0, l = bounds.length; i < l; i++) {
var polygon = new AMap.Polygon({
map: map,
strokeWeight: 1,
strokeColor: '#CC66CC',
fillColor: '#CCF3FF',
fillOpacity: 0.5,
path: bounds[i]
});
polygons.push(polygon);
}
map.setFitView();
} var subList = data.districtList;
var level = data.level; if (level === 'province') {
nextLevel = 'city';
citySelect.innerHTML = '';
districtSelect.innerHTML = '';
areaSelect.innerHTML = '';
} else if (level === 'city') {
nextLevel = 'district';
districtSelect.innerHTML = '';
areaSelect.innerHTML = '';
} else if (level === 'district') {
nextLevel = 'street';
areaSelect.innerHTML = '';
}
if (subList) {
var contentSub = new Option('--请选择--');
for (var i = 0, l = subList.length; i < l; i++) {
var name = subList[i].name;
var levelSub = subList[i].level;
var cityCode = subList[i].citycode;
if (i == 0) {
document.querySelector('#' + levelSub).add(contentSub);
}
contentSub = new Option(name);
contentSub.setAttribute("value", levelSub);
contentSub.center = subList[i].center;
contentSub.adcode = subList[i].adcode;
document.querySelector('#' + levelSub).add(contentSub);
}
} }
function search(obj) {
//清除地图上所有覆盖物
for (var i = 0, l = polygons.length; i < l; i++) {
polygons[i].setMap(null);
}
var option = obj[obj.options.selectedIndex];
var keyword = option.text; //关键字
var adcode = option.adcode;
district.setLevel(option.value); //行政区级别
district.setExtensions('all');
//行政区查询
//按照adcode进行查询可以保证数据返回的唯一性
district.search(adcode, function (status, result) {
if (status === 'complete') {
getData(result.districtList[0]);
setFence();
}
});
}
function setCenter(obj) {
mapCenter = obj[obj.options.selectedIndex].center;
map.setCenter(obj[obj.options.selectedIndex].center);
setFence();
} function clearMap() {
map.clearMap();
}以上代码，可以完成行政区查询，提供全国各省、市、县、区的中心点经纬度、行政区边界坐标组、下级行政区等信息。根据行政区边界坐标组可在地图上绘制行政区边界。注意：AMap.DistrictSearch行政区查询服务插件的初始化有2种方式，第一种：使用插件同步下发功能才能这样直接使用（本文采用此种方式，注意查看插件的引用）；第二种：（查看下面的代码）
mapObj.plugin('AMap.DistrictSearch', function () {
var opts = {
subdistrict: 0, //返回下一级行政区
extensions: 'all', //返回行政区边界坐标组等具体信息
level:'city' //查询行政级别为 市
};
mapObj.plugin('AMap.DistrictSearch', function () {
var opts = {
subdistrict: 0, //返回下一级行政区
extensions: 'all', //返回行政区边界坐标组等具体信息
level:'city'//查询行政级别为市
};