js implements a province and city three-level linkage selection box code sharing_javascript skills

Operation effect:

======================================== ===========
Part of the code:
================================ ===================
Of course you must have this table in your database first, otherwise you will have no data...^_^

Copy code The code is as follows:

Location:







${xzqh.province }

js code:

Copy code The code is as follows:

/**
* Load City
*
*/
function loadCity() {
var provinceId = $("#provinceSelect option:selected").val() ;
if(provinceId == null || provinceId == ""){
//alert("Province not found");
}else{
$.post(rootPath "/ loadCity", {
"q" : provinceId
}, function(data, result) {
if(data == "noId"){
alert("Request error");
}else if(data == "null"){
alert("The system cannot find the city belonging to the province");
}else{
data = eval("{" data "} ");
var citySelect = $("#citySelect");
var myCity = $("#myCity").val();
citySelect.html("");
for ( var i = 0; i < data.length; i ) {
if(myCity != null && myCity != "" && myCity > 0 && myCity == data[i].id){
citySelect.append(""
data[i].name "");
}else{
citySelect.append(""
data[i].name "");
}
}
loadRegion();
}
});
}
};
/**
* Loading area
*
*/
function loadRegion() {
var cityId = $("#citySelect option:selected").val();
if(cityId == null || cityId == "" || cityId < 1){
alert( "City not found");
}else{
$.post(rootPath "/loadRegion", {
"q" : cityId
}, function(data, result) {
if(data == "noId"){
alert("Request error");
}else if(data == "null"){
alert("The system cannot find the file belonging to this city region");
}else{
data = eval("{" data "}");
var regionSelect = $("#regionSelect");
var myRegion = $(" #myRegion").val();
regionSelect.html("");
for ( var i = 0; i < data.length; i ) {
if(myRegion != null && myRegion != "" && myRegion > 0 && myRegion == data[i].id){
regionSelect.append(""
data[i].name "");
}else{
regionSelect.append(""
data[i].name "");
}
}
}
});
}
};
/**
* Province change event
*
*/
$("#provinceSelect").change(loadCity);
/**
* City change event
*
*/
$("#citySelect").change(loadRegion );

$(function() {
loadCity();
});

Background methods:

Copy code The code is as follows:

/**
* Load city data
*
*/
public void loadCity() {
if (q == null || q.trim().equals("")) {
write("noId");
} else {
List citys = xzqhService.queryCitys(q.trim());
if (citys == null || citys.size() < 1) {
write("null");
} else {
StringBuilder builder = new StringBuilder("[");
for (Xzqh city : citys) {
builder.append("{'id':'");
builder.append(city.getCityId());
builder.append("','name':'");
builder.append(city.getCity());
builder.append("'},");
}
if (builder.length() > 1)
builder.replace(builder.length() - 1, builder.length(), "]");
write(builder.toString());
}
}
}
/**
* Load area data
*
*/
public void loadRegion() {
if (q == null || q.trim().equals("")) {
write("noId");
} else {
List citys = xzqhService.queryDistricts(q.trim());
if (citys == null || citys.size() < 1) {
write("null");
} else {
StringBuilder builder = new StringBuilder("[");
for (Xzqh district : citys) {
builder.append("{'id':'");
builder.append(district.getRegionId());
builder.append("','name':'");
builder.append(district.getRegion());
builder.append("'},");
}
if (builder.length() > 1)
builder.replace(builder.length() - 1, builder.length(), "]");
write(builder.toString());
}
}
}