This article describes the method of putting information into XML by JSP. Share it for your reference, as follows:
1. jsp code:
Province： <select name="province" onchange="jsSubmit()">
<option value="Beijing" selected="selected">Beijing</option>
<option value="Guangdong">Guangdong</option>
<option value="Hainan">Hainan</option>
</select>
city： <select name="city">
<option value="Beijing">Beijing</option>
</select>
2. You don’t need to write the ajax code to create server request code. You can write the event jsSubmit when writing onchange:
function jsSubmit() {
createXMLHttpRequest();
var province = ("province");
//Solve that the client transmits Chinese garbled code to the server side var uri = "AjaxAction?value=" + encodeURI(encodeURI());
("POST", uri, true);
("Content-Type","application/x-www-form-urlencoded;")
= processResponse;//Callback function! (null);
}
3. servlet
public class AjaxAction extends HttpServlet {
private static final long serialVersionUID = 1L;
private static Map<String, String[]> map = new HashMap<String, String[]>();
static {
String[] cities1 = { "Haikou", "Qionghai", "Sanya" };
String[] cities2 = { "Guangzhou", "Zhuhai", "Foshan", "Shenzhen" };
String[] cities3 = { "Beijing" };
("Beijing", cities3);
("Guangdong", cities2);
("Hainan", cities1);
}
stmethod{
String province = ("value");// Solve the client to transmit Chinese garbled code to the server String proviceCN = (province, "UTF-8");
String[] cities = (proviceCN);// According to the province that was sent, find out the corresponding city that has been stored in the map ("text/xml; charset=UTF-8");
StringBuffer buff=new StringBuffer("<citylist>");///Prepare the spelling string... for (String city : cities)
{
("<city>").append(city) .append("</city>");
}
("</citylist>");
().println(());
4. Ajax callback function
function processResponse() {
if( == 4) {
if( == 200) {
var cities = ("city");
var displaySelect = ("city");
= null;
for (var i= 0 ;i < ; i++){
if (i == 0) {
var a= ("city")[i].;//Use the firstChild method, other methods, I use the text method and it doesn't work~ I don't know what's going on var op = new Option(a, a, true, true);
} else {
var a= ("city")[i].;
var op = new Option(a, a);
alert(a);
}
[i] = op;
}
} else {
("The requested page has an exception");
}
}
}
I hope this article will be helpful to everyone's jsp programming.