jsp里的两个select：
<select name="lei" onchange="callServer(this.options[this.selectedIndex].text)">
<%
rs=stmt.executeQuery("select dfl from dhyfl");
while(rs.next()){
%>
<option><%=rs.getString("dfl") %></option>
<%
}
%>
</select><select name="smallLei"></select>
jsp底部的Ajax：
<script language="javascript">
var xmlHttp=false;
try {
xmlHttp = new XMLHttpRequest();
} catch (trymicrosoft) {
try {
xmlHttp = new ActiveXObject("Msxml2.XMLHTTP");
} catch (othermicrosoft) {
try {
xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
} catch (failed) {
}
}
}
function callServer(smallLei){
var url="<%=request.getContextPath()%>/smallLei?lei=" + smallLei;
xmlHttp.open("get",url,"true");
xmlHttp.onreadystatechange =upsmlei;
xmlHttp.send(null);
}
function upsmlei(){
if(xmlHttp.readyState == 4){
if(xmlHttp.status==200){
var smlei = document.all.smallLei;
smlei.options.length=0;
var arr=xmlHttp.responseText.split("|");
for(var i=0;i<arr.length-1;i++){
smlei.add(new Option(arr[i],arr[i]));
}
}
}
}
</script>
Ajax的servlet：
package cqrx.ajax;
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.ResultSet;
import java.sql.Statement;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import cqrx.zgdsc.Conn;
public class SmallLei extends HttpServlet {
public SmallLei() {
super();
}
public void destroy() {
super.destroy();
}
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=gb2312");
PrintWriter out = response.getWriter();
String lei = request.getParameter("lei");
lei = new String(lei.getBytes("ISO8859-1"), "GB2312");
out.print(lei);
Conn c = new Conn();
Statement stmt = null;
ResultSet rs = null;
try {
stmt = c.getConn().createStatement();
String sql = "select sfl from shyfl where dfl ='" + lei + "'";
rs = stmt.executeQuery(sql);
String str = "";
while (rs.next()) {
str = str + rs.getString(1) + "|";
}
out.print(str);
} catch (Exception e) {
System.out.print(e.getMessage());
} finally {
out.flush();
out.close();
}
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request, response);
}
public void init() throws ServletException {
}
}
posted on 2007-07-31 16:18
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