/**

 * @name		jQuery Cascdejs plugin

 * @author		zdy

 * @version 	1.0 

 */



//首先需要初始化

var xmlDoc;

var TopnodeList;

var citys;

var countyNodes;

var nodeindex = 0;

var childnodeindex = 0;

//获取xml文件

function cascdeInit(root,v1,v2,v3) {

    //打开xlmdocm文档

    xmlDoc = loadXmlFile(root+'/Area2.xml');

    var dropElement1 = document.getElementById("sel-provance");

    var dropElement2 = document.getElementById("sel-city");

    var dropElement3 = document.getElementById("sel-area");

    RemoveDropDownList(dropElement1);

    RemoveDropDownList(dropElement2);

    RemoveDropDownList(dropElement3);

    if (window.ActiveXObject) {

        TopnodeList = xmlDoc.selectSingleNode("address").childNodes;

    }

    else {

        TopnodeList = xmlDoc.childNodes[0].getElementsByTagName("province");      

    }

    if (TopnodeList.length > 0) {

        //省份列表

        var county;

        var province;

        var city;

        for (var i = 0; i < TopnodeList.length; i++) {

            //添加列表项目

            county = TopnodeList[i];          

            var option = document.createElement("option");

            option.value = county.getAttribute("name");

            option.text = county.getAttribute("name");

            if (v1 == option.value) {

                option.selected = true;

                nodeindex = i;

            }

            dropElement1.add(option);

        }

        if (TopnodeList.length > 0) {

            //城市列表

            citys = TopnodeList[nodeindex].getElementsByTagName("city")

            for (var i = 0; i < citys.length; i++) {

                var id = dropElement1.options[nodeindex].value;

                //默认为第一个省份的城市

                province = TopnodeList[nodeindex].getElementsByTagName("city");

                var option = document.createElement("option");

                option.value = province[i] .getAttribute("name");

                option.text = province[i].getAttribute("name");

                if (v2 == option.value) {

                    option.selected = true;

                    childnodeindex = i;

                }

                dropElement2.add(option);

            }

			selectcounty(v3);

        }

    }

}



/*

//依据省设置城市，县

*/

function selectCity() {

    var dropElement1 = document.getElementById("sel-provance");

    var name = dropElement1.options[dropElement1.selectedIndex].value;     

    countyNodes = TopnodeList[dropElement1.selectedIndex];      

    var province = document.getElementById("sel-city");

    var city = document.getElementById("sel-area");

    RemoveDropDownList(province);

    RemoveDropDownList(city);

    var citynodes;

    var countycodes;

    if (window.ActiveXObject) {

        citynodes = xmlDoc.selectSingleNode('//address/province [@name="' + name + '"]').childNodes;

    } else {

        citynodes = countyNodes.getElementsByTagName("city")

    }

    if (window.ActiveXObject) {

        countycodes = citynodes[0].childNodes;

    } else {

        countycodes = citynodes[0].getElementsByTagName("county")

    }

  

    if (citynodes.length > 0) {

        //城市

        for (var i = 0; i < citynodes.length; i++) {

            var provinceNode = citynodes[i];

            var option = document.createElement("option");

            option.value = provinceNode.getAttribute("name");

            option.text = provinceNode.getAttribute("name");

            province.add(option);

        }

        if (countycodes.length > 0) {

            //填充选择省份的第一个城市的县列表

            for (var i = 0; i < countycodes.length; i++) {

                var dropElement2 = document.getElementById("sel-city");

                var dropElement3 = document.getElementById("sel-area");

                //取当天省份下第一个城市列表

                

                //alert(cityNode.childNodes.length); 

                var option = document.createElement("option");

                option.value = countycodes[i].getAttribute("name");

                option.text = countycodes[i].getAttribute("name");

                dropElement3.add(option);

            }

        }

    }

}

/*

//设置县,区

*/

function selectcounty(v3) {

    var dropElement1 = document.getElementById("sel-provance");

    var dropElement2 = document.getElementById("sel-city");

    var name = dropElement2.options[dropElement2.selectedIndex].value;

    var city = document.getElementById("sel-area");  

    var countys = TopnodeList[dropElement1.selectedIndex].getElementsByTagName("city")[dropElement2.selectedIndex].getElementsByTagName("county")

    RemoveDropDownList(city);

    for (var i = 0; i < countys.length; i++) {

        var countyNode = countys[i];

        var option = document.createElement("option");

        option.value = countyNode.getAttribute("name");

        option.text = countyNode.getAttribute("name");

        if(v3==option.value){

        	option.selected=true;

        }

        city.add(option);

    }

}

function RemoveDropDownList(obj) {

    if (obj) {

        var len = obj.options.length;

        if (len > 0) {  

            for (var i = len; i >= 0; i--) {

                obj.remove(i);

            }

        }

    }

}

/*

//读取xml文件

*/

function loadXmlFile(xmlFile) {

    var xmlDom = null;

    if (window.ActiveXObject) {

        xmlDom = new ActiveXObject("Microsoft.XMLDOM");

        xmlDom.async = false;

        xmlDom.load(xmlFile) || xmlDom.loadXML(xmlFile);//如果用的是XML字符串//如果用的是xml文件  

    } else if (document.implementation && document.implementation.createDocument) {

      var xmlhttp = new window.XMLHttpRequest();

      xmlhttp.open("GET", xmlFile, false);

       xmlhttp.send(null);

       xmlDom = xmlhttp.responseXML;

       

    

       

    } else {

        xmlDom = null;

    }

    return xmlDom;

}