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model view controller - How get the data using MVC- Servlets, JPS and JavaScripts -


i have jsp page has links (when people click on link supposed go servlet , bean class , db connection class pull data)..and when user clicks on tried display page using ajax...however not getting data/page pulled. can please explain on how achive this?

here link have in html page..but when click on not showing anything.

 <a href="myservlet" onclick="grabfile(this.href); return false;">vt </a>

thanks help

sorry here code

public class vacationtrackerdao { public static list<vactiontrackerbean> list() throws sqlexception{ list<vactiontrackerbean> appr= new arraylist<vactiontrackerbean>(); try{ dbconnection conobj=new dbconnection(); connection dbcon= conobj.getcon(); statement stmt=conobj.getstmt(); string querycplist="select * capacity_plan"; string queryapprlist="select first_last_name vacation_approvers"; preparedstatement prestmtcplist=dbcon.preparestatement(querycplist);//get metadat preparedstatement prestmtapprlist=dbcon.preparestatement(queryapprlist);//get names resultset rscplist=prestmtcplist.executequery(); resultset rsapprlist=prestmtcplist.executequery(); resultsetmetadata metacplist=rscplist.getmetadata(); vactiontrackerbean vtbean=new vactiontrackerbean(); while(rsapprlist.next()){ vtbean.setapprover((rsapprlist.getstring("first_last_name"))); appr.add(vtbean); } }catch(exception e){ system.out.println("in vacation trackerdao.java class:"+e); } return appr; } }

here servlets gets request.

protected void dopost(httpservletrequest request, httpservletresponse response) throws servletexception, ioexception { try{ list<vactiontrackerbean> vacbean=vacationtrackerdao.list(); request.setattribute("vactracker", vacbean); request.getrequestdispatcher("web-inf/vacationtracker.jsp").forward(request,response); }catch (sqlexception e){ system.out.println("error in vacationtracker.java due vactiontrackerda.java:"+e); request.getrequestdispatcher("web-inf/error.jsp").forward(request,response); }

here code have in jsp page.

<li> <a href="main.jsp" > home </a> </li> <li><a href="vacationtracker" onclick="grabfile(this.href); return false;">vacation tracker </a> </li> </ul>

here code javascript

function gethttpobject(){ var xhr=false; if(window.xmlhttprequest){ xhr= new xmlhttprequest(); } else if(window.activexobject){ try{ xhr= new activexobject("msxml2.xmlhttp"); } catch(e){ try{ xhr=new activexobject("microsoft.xmlhttp"); }catch (e){ xhr=false; } } } return xhr;

}

function grabfile(file){ var request=gethttpobject(); if(request){ request.onreadystatechange=function(){ displayresponse(request);}; } request.open("post",file,true); request.send(null);

}

function displayresponse(request){ if(request.readystate==4){ if(request.status==200){ document.getelementbyid ("middle_sub").innerhtml=request.responsetext; } } }

model view controller - how data using mvc- servlets, jps , javascripts - stack overflow

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up vote 0 down vote favorite

i have jsp page has links (when people click on link supposed go servlet , bean class , db connection class pull data)..and when user clicks on tried display page using ajax...however not getting data/page pulled. can please explain on how achive this?

here link have in html page..but when click on not showing anything.

 <a href="myservlet" onclick="grabfile(this.href); return false;">vt </a>

thanks help

sorry here code

public class vacationtrackerdao { public static list<vactiontrackerbean> list() throws sqlexception{ list<vactiontrackerbean> appr= new arraylist<vactiontrackerbean>(); try{ dbconnection conobj=new dbconnection(); connection dbcon= conobj.getcon(); statement stmt=conobj.getstmt(); string querycplist="select * capacity_plan"; string queryapprlist="select first_last_name vacation_approvers"; preparedstatement prestmtcplist=dbcon.preparestatement(querycplist);//get metadat preparedstatement prestmtapprlist=dbcon.preparestatement(queryapprlist);//get names resultset rscplist=prestmtcplist.executequery(); resultset rsapprlist=prestmtcplist.executequery(); resultsetmetadata metacplist=rscplist.getmetadata(); vactiontrackerbean vtbean=new vactiontrackerbean(); while(rsapprlist.next()){ vtbean.setapprover((rsapprlist.getstring("first_last_name"))); appr.add(vtbean); } }catch(exception e){ system.out.println("in vacation trackerdao.java class:"+e); } return appr; } }

here servlets gets request.

protected void dopost(httpservletrequest request, httpservletresponse response) throws servletexception, ioexception { try{ list<vactiontrackerbean> vacbean=vacationtrackerdao.list(); request.setattribute("vactracker", vacbean); request.getrequestdispatcher("web-inf/vacationtracker.jsp").forward(request,response); }catch (sqlexception e){ system.out.println("error in vacationtracker.java due vactiontrackerda.java:"+e); request.getrequestdispatcher("web-inf/error.jsp").forward(request,response); }

here code have in jsp page.

<li> <a href="main.jsp" > home </a> </li> <li><a href="vacationtracker" onclick="grabfile(this.href); return false;">vacation tracker </a> </li> </ul>

here code javascript

function gethttpobject(){ var xhr=false; if(window.xmlhttprequest){ xhr= new xmlhttprequest(); } else if(window.activexobject){ try{ xhr= new activexobject("msxml2.xmlhttp"); } catch(e){ try{ xhr=new activexobject("microsoft.xmlhttp"); }catch (e){ xhr=false; } } } return xhr;

}

function grabfile(file){ var request=gethttpobject(); if(request){ request.onreadystatechange=function(){ displayresponse(request);}; } request.open("post",file,true); request.send(null);

}

function displayresponse(request){ if(request.readystate==4){ if(request.status==200){ document.getelementbyid ("middle_sub").innerhtml=request.responsetext; } } }
share|improve question
    
far broad - must provide relevant parts of code. given 1 link it's not possible guess might go wrong! – home jul 7 '12 @ 5:54
    
almost duplicate stackoverflow.com/questions/11443896/mvc-servlets-jsp-no-out‌​put – hardik mishra jul 12 '12 @ 6:16

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