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JavaScript XML City and county three-level linkage drop-down Menu

Source: Internet
Author: User
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JS Code

The code is as follows Copy Code
<html>


<head runat= "Server" >


<title> provincial and county level three linkage menu </title>


<script language= "javascript" type= "Text/javascript" >


First you need to initialize


var xmldoc;


var Nodeindex;


function Getxmldoc ()


{


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


var Currnode;


Xmldoc.async=false;


Xmldoc.load ("Area.xml");


if (xmldoc.parseerror.errorcode!=0)


{


var myerr=xmldoc.parseerror;


Alert ("Error!") "+myerr.reason);


}


}


function Init ()


{


Open XLMDOCM Document


Getxmldoc ();


var Dropelement1=document.getelementbyid ("Select1");


var Dropelement2=document.getelementbyid ("Select2");


var Dropelement3=document.getelementbyid ("Select3");


Removedropdownlist (DROPELEMENT1);


Removedropdownlist (DropElement2);


Removedropdownlist (DROPELEMENT3);


var topnodelist=xmldoc.selectsinglenode ("Address"). ChildNodes;


if (topnodelist.length>0)


{


Province List


var country;


Var province;


VAR City;


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


{


Add list items


Country=topnodelist[i];


var eoption=document.createelement ("option");


Eoption.value=country.getattribute ("name");


Eoption.text=country.getattribute ("name");


Dropelement1.add (eoption);


}


if (topnodelist[0].childnodes.length>0)


{


City List


for (Var i=0;i<topnodelist[0].childnodes.length;i++)


{


var Id=dropelement1.options[0].value;


The default is the city of the first province


PROVINCE=TOPNODELIST[0];


var eoption=document.createelement ("option");


Eoption.value=province.childnodes[i].getattribute ("name");


Eoption.text=province.childnodes[i].getattribute ("name");


Dropelement2.add (eoption);


}


if (topnodelist[0].childnodes[0].childnodes.length>0)


{


County List


for (Var i=0;i<topnodelist[0].childnodes[0].childnodes.length;i++)


{


var Id=dropelement2.options[0].value;


Default is the first county list for the first city


City=topnodelist[0].childnodes[0];


var eoption=document.createelement ("option");


Eoption.value=city.childnodes[i].getattribute ("name");


Eoption.text=city.childnodes[i].getattribute ("name");


This.document.getElementById ("Select3"). Add (Eoption);


}


}


}


}


}


function selectcity ()


{var Dropelement1=document.getelementbyid ("Select1");


var Name=dropelement1.options[dropelement1.selectedindex].value;


alert (ID);


var countrynodes=xmldoc.selectsinglenode ('//address/province [@name = ' ' +name+ '] ');


alert (countryNodes.childNodes.length);


var Province=document.getelementbyid ("Select2");


var City=document.getelementbyid ("Select3");


Removedropdownlist (province);


Removedropdownlist (city);


if (countrynodes.childnodes.length>0)


{


Fill City


for (Var i=0;   i<countrynodes.childnodes.length; i++)


{


var provincenode=countrynodes.childnodes[i];


var eoption=document.createelement ("option");


Eoption.value=provincenode.getattribute ("name");


Eoption.text=provincenode.getattribute ("name");


Province.add (eoption);


}


if (countrynodes.childnodes[0].childnodes.length>0)


{


Populate the county list for the first city in the selected province


for (Var i=0;i<countrynodes.childnodes[0].childnodes.length;i++)


{


Alert ("i=" +i+ "rn" + "length=" +countrynodes.childnodes[0].childnodes.length+ "RN");


var Dropelement2=document.getelementbyid ("Select2");


var Dropelement3=document.getelementbyid ("Select3");


Take the first city list in the province of the day


var citynode=countrynodes.childnodes[0];


alert (cityNode.childNodes.length);


var eoption=document.createelement ("option");


Eoption.value=citynode.childnodes[i].getattribute ("name");


Eoption.text=citynode.childnodes[i].getattribute ("name");


Dropelement3.add (eoption);


}


}


}


}


function SelectCountry ()


{


var Dropelement2=document.getelementbyid ("Select2");


var Name=dropelement2.options[dropelement2.selectedindex].value;


var provincenode=xmldoc.selectsinglenode ('//address/province/city[@name = ' +name+ '] ');


var City=document.getelementbyid ("Select3");


Removedropdownlist (city);


for (Var i=0;   i<provincenode.childnodes.length; i++)


{


var citynode=provincenode.childnodes[i];


var eoption=document.createelement ("option");


Eoption.value=citynode.getattribute ("name");


Eoption.text=citynode.getattribute ("name");


City.add (eoption);


}


}


function Removedropdownlist (obj)


{


if (obj)


{


var len=obj.options.length;


if (len>0)


{


alert (len);


for (Var i=len;i>=0;i--)


{


Obj.remove (i);


}


}


}





}


</script>


</head>


<body onload= "Init ();" >


<form id= "Form1" runat= "Server" >


<div>


<select id= "Select1" name= "Select1" runat= "Server" onchange= "selectcity" (); " >


<option value= "" selected= "true" > Province/Municipality </option>


</select>


<select id= "Select2" name= "Select2" runat= "Server" onchange= "SelectCountry ()" >


<option value= "" selected= "true" > Please select </option>


</select>


<select id= "Select3" name= "Select3" runat= "Server" >


<option value= "" selected= "true" > Please select </option>


</select>


</div>


</form>


</body>


</html>

XML file

The code is as follows Copy Code
<?xml version= "1.0" encoding= "gb2312"?>


<address>


<province name= "Beijing" >


<city name= "Beijing Jurisdiction" >


<country name= "Dongcheng District"/>


<country name= "Xicheng District"/>


<country name= "Chongwen District"/>


<country name= "Xuanwu District"/>


<country name= "Chaoyang District"/>


<country name= "Fengtai District"/>


<country name= "Shijingshan District"/>


<country name= "Haidian District"/>


<country name= "Mentougou District"/>


<country name= "Fangshan District"/>


<country name= "Tongzhou District"/>


<country name= "Shunyi District"/>


<country name= "Changping District"/>


<country name= "Daxing District"/>


<country name= "Huairou"/>


<country name= "Pinggu District"/>


</city>


<city name= "Beijing County" >


<country name= "Miyun County"/>


<country name= "Yanqing County"/>


</city>


</province>


<province name= "Tianjin" >


<city name= "Tianjin jurisdiction" >


<country name= "Zone of Peace"/>


<country name= "Hedong District"/>


<country name= "Hexi District"/>


<country name= "Nankai District"/>


<country name= "Hebei District"/>


<country name= "Hongqiao District"/>


<country name= "Tanggu District"/>


<country name= "Hangu District"/>


<country name= "Grand Port District"/>


<country name= "Dongli District"/>


<country name= "Xiqing District"/>


<country name= "Jinnan District"/>


<country name= "Beichen District"/>


<country name= "Wuqing District"/>


<country name= "Baochi District"/>


</city>


<province name= "Taiwan Province"/>


<province name= "HKSAR"/>


<province name= "MSAR"/>


</address>

Here I only add a few cities and more cities, you can click the XML rules to add their own oh.

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

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