The menu resource is saved in the database. Leverages the Ajax implementation of jquery. The packages used include: Json-lib-2.2.3-jdk15.jar Ezmorph-1.0.6.jar json.js jquery.js
code for the JSP page:
Copy Code code as follows:
<%@ page contenttype= "text/html; CHARSET=GBK "%>
<%@ taglib prefix= "s" uri= "/struts-tags"%>
<script type= "Text/javascript" src= "Js/jquery.js" ></script>
<script type= "Text/javascript" src= "Js/json.js" ></script>
<% String basepath = request.getscheme () + "://" + request.getservername () + ":" + request.getserverport () + request.ge Tcontextpath () + "/";
Out.println (BasePath);
%>
<script type= "Text/javascript" >
JQuery (function ($) {
Alert ("OK");
});
function Onchangeshow (Oneid) {
$.ajax ({
URL: "<%=basepath%>catejson.whbs",
Data: {Parentid:oneid},//Parameters
Type: "Post",
Cache:false,
DataType: "JSON",//return JSON data
Error:function () {
Alert (' Error ');
},
Success:onchangecallback
});
}
function Onchangecallback (data) {
document.all[' twoid '].options.length = 0; Clear the original option
var str= "";
for (Var i=0;i<data.length;i++) {
str+= "<option value= '" +data[i].recordid+ "' >" +data[i].title+ "</option>"
}
$ ("#twoId"). html (str);
}
</script>
<body>
<div align= "center" >
Please select a department type
<s:select list= "Rfones" listkey= "RecordID" listvalue= "title" Name= "Oneid" theme= "simple" id= "Oneid" value= "OneId" Onchange= "Onchangeshow (this.value)" ></s:select>
Please select a file type
<s:select list= "Rftwos" listkey= "RecordID" listvalue= "title" Name= "Twoid" theme= "simple" id= "twoid" value= "TwoId" ></s:select>
</div>
</body>
code for action in Struts
Copy Code code as follows:
/**
* des: Access to level Two linkage menu
* Autho:exceljava
* Date:nov 20, 2009 br>* @return
* @throws ioexception
* *
Public String getjsoncategory () throws ioexception{
Rfjsons= Archiveservice.getcategorybyparentid (ParentID)//Here get the data from the database
Net.sf.json.JSONArray jsonobj= Net.sf.json.JSONArray.fromObject (rfjsons);//assembled into JSON data
SendMessage (jsonobj.tostring ());//push JSON data to view
return null;
}
/**
* des: encapsulating data sent in JSON format back to JS
* Autho:exceljava
* Date:nov, 2009
* @param content
* @throws IOException
*/
public void SendMessage (String content) throws ioexception{
Httpservletrespon SE response = servletactioncontext.getresponse ();
Response.setcharacterencoding ("UTF-8");
Response.getwriter (). write (content);
}
