1
JSP page JSCode
<% @ Page Language = "Java" Import = "Java. util. * "pageencoding =" UTF-8 "%> <br/> <% @ page import =" svse. ZP. bean. togadmindao "%> <br/> <% @ page import =" svse. ZP. bean. admininfo "%> <br/> <MCE: Script Type =" text/JavaScript "> <! -- <Br/> var req; <br/> window. onload = function () {<br/>}< br/> function change_select () {<br/> var Zhi = document. getelementbyid ('team '). value; // obtain the selected value from the first drop-down menu <br/> var url = "Servlet/servlet? Id = "+ Zhi; // specify the URL for sending the request. The parameter ID is the value of the variable Zhi <br/> If (window. XMLHttpRequest) {<br/> Req = new XMLHttpRequest (); // create an XMLHTTPRequest object <br/>} else if (window. activexobject) {<br/> Req = new activexobject ("Microsoft. XMLHTTP "); <br/>}< br/> If (req) {<br/> req. open ("get", URL, true); // create a request <br/> req. onreadystatechange = callback; <br/> req. send (null); <br/>}</P> <p> function callback () {<br/> If (req. readystate = 4) {// If (req. status = 200) {// If the req status is 200, it indicates OK <br/> parsemessage (); // process the XML returned file, parse XML document </P> <p >}else {<br/> alert ("not able to retrive description" + req. statustext); <br/>}</P> <p> function parsemessage () {<br/> var xmldoc = req.responsexml.doc umentelement; // obtain the returned XML document <br/> var xsel = xmldoc. getelementsbytagname ('select'); </P> <p> var select_root = document. getelementbyid ('player'); <br/> select_root.options.length = 0; </P> <p> for (VAR I = 0; I <xsel. length; I ++) {<br/> var xvalue = xsel [I]. childnodes [0]. firstchild. nodevalue; <br/> var xtext = xsel [I]. childnodes [1]. firstchild. nodevalue; <br/> var option = New Option (xtext, xvalue); </P> <p> try <br/>{< br/> select_root.add (option ); <br/>}< br/> catch (e) {}< br/>}</P> <p> // --> </MCE: SCRIPT> <br/>
2 body Page code
Page body code: </P> <p> <body> <br/> <Div align = "center"> <br/> <form name = "form1" method = "Post" Action = ""> <br/> <Table width = "70%" border = "0" cellpadding = "0"> <br/> <tr> <br/> <TD align = "center"> double select box </TD> <br/> </tr> <br/> <TD> <select name = "team" id = "team" onchange = "change_select () "> <br/> <% togadmindao Dao = new togadmindao (); <br/> List <admininfo> lsit = (list <admininfo>) Dao. getadmininfo (); <br/> for (admininfo Li: lsit) {<br/>%> <br/> <option value = "<% = Li. getadminid () %> "> <% = Li. getadminname () %> </option> <br/> <% }%> <br/> </SELECT> <br/> <select name = "Player" id = "Player"> <br/> <option value = "0"> select </option> <br/> </SELECT> </TD> <br/> </tr> <br /> <tr> <TD> </tr> <br/> </table> <br/> </form> </P> <p> </div> </P> <p> </body> <br/>
3servlet code
Response. setcontenttype ("text/XML"); <br/> response. setheader ("cache-control", "No-Cache"); <br/> response. setcharacterencoding ("UTF-8"); <br/> int targetid = integer. parseint (request. getparameter ("ID"); <br/> system. out. println (targetid + ""); <br/> string xml_start = "<selects>"; <br/> string xml_end = "</selects> "; <br/> string xml = ""; <br/> togadmindao Dao = new togadmindao (); </P> <p> admininfo B = Dao. getAdmin (targetid); <br/> xml = "<SELECT> <value>" + B. getadminpwd () + "</value> <text>" + B. getadminpwd () + "</text> </SELECT>"; <br/> string last_xml = xml_start + XML + xml_end; <br/> response. getwriter (). write (last_xml); <br/>}< br/>
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