var map, district, polygons = [], citycode;
var citySelect = document.getElementById('city');
var province=null;
var func=null;
var provincename="";
var cityname="";

function setDistrict()
{
	$("#city").append('<option value="">请选择</option>');
	//行政区划查询
	var opts = {
		subdistrict: 1,   //返回下一级行政区
		level: 'city',
		showbiz:false  //查询行政级别为 市
	};
	
	district = new AMap.DistrictSearch(opts);//注意：需要使用插件同步下发功能才能这样直接使用
	district.search('中国', function(status, result) {
		if(status=='complete'){
		getData(result.districtList[0]);
	}
	});
}

function getData(data)
{
	var subList = data.districtList;
	province=subList;
	var level = data.level;

	//清空下一级别的下拉列表
	if (level === 'province') {
		nextLevel = 'city';
		$("#city").empty();
	}

	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);
			
		}
		if (provincename!="")
		{
			$("#province option").each(function (){
				if($(this).text()==provincename){
					$(this).attr('selected',true);
					var checkIndex=$("#province").get(0).selectedIndex;
					var obj = document.getElementById("province");
					provincename="";
					search(obj.options[checkIndex]);
				}
			});
		}
		if (provincename==""&&cityname!="")
		{
			$("#city option").each(function (){
				if($(this).text()==cityname){
					cityname="";
					$(this).attr('selected',true);
				}
			});
		}
	}
	
	$("#province").change(function(){
		var checkIndex=$("#province").get(0).selectedIndex;
		search(this[checkIndex]);
	});
}

function customProvince(_provincename,_cityname)
{
	provincename=_provincename;
	cityname=_cityname;
	setDistrict();
}

function search(option) 
{
	//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]);
		}
	});

}