How to realize the two-level linkage between province and city in AJAX drop-down box

This article introduces the relevant knowledge of "how to achieve the two-level linkage of provinces and cities in the AJAX drop-down box". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Jsp page code:

The copy code is as follows:

Var xmlHttp=null

/ / create a xmlhttprequest object

If (window.XMLHttpRequest) {

XmlHttp=new XMLHttpRequest ()

} else {

XmlHttp=new ActiveObject ("Microsoft.XMLHTTP")

}

Var url= GetProvince?time= + new Date (). GetTime ()

Function getsheng () {

XmlHttp.open ("post", url,true)

XmlHttp.setRequestHeader ("Content-Type", "application/x-www-form-urlencoded")

XmlHttp.send ()

XmlHttp.onreadystatechange=getprovince

}

Function getprovince () {

If (xmlHttp.readyState==4 & & xmlHttp.status==200) {

Var xmlFile=xmlHttp.responseXML

/ / get the node of the province

Var province=xmlFile.getElementsByTagName ("province")

/ / get the select tag

Var pselect=document.getElementById ("sheng")

/ / cycle to check out the provincial information of the xml file

For (var iTuno Bandi)