Processing form's element(s) in JSP -

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i have html form in jsp page, , in have javascript validation. user must enter 1 field: name or id or year, , java file search student in database name or id or year. javascript alerts when no field filled , performs action if 1 field filled.

<html> <head> <title>student search database</title>  <script language="javascript"> function validate2(objform){  int k = 0; if(objform.name.value.length==0){ objform.name.focus(); k++; }  if(objform.year.value.length==0){ objform.year.focus(); k++; }  if(objform.id.value.length==0){ objform.year.focus(); k++; }  if(k == 0){ return false; } return true; } </script>   </head> <body bgcolor=#add8e6><center>  <form action="foundstudents.jsp" method="post" name="entry2" onsubmit="validate2(this)"> <input type="hidden" value="list" name="seek_stud">

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the problem want process parameter receive in foundstudents.jsp: if year, in db student(s) in year , display student(s)' data(do in java file). how in foundstudents.jsp without checking again field filled(i've done in javascript searchstudent.jsp). mean foundstudents.jsp calls method in java file searching , displaying.

i tried input hidden worked, more forms. have 1.

foundstudent.jsp

<%@page import="stud.diploma.students.studentsmanager"%> <%@page import="stud.diploma.students.student"%> <%@page import="java.util.arraylist"%> <%@page import="stud.diploma.database.connectionsmanager"%>  <%@ page language="java" import="java.sql.*, java.lang.*" %>  <% student search = null; if(request.getparameter("seek_stud") != null){  //reading params searchstudent form string name = request.getparameter("name"); string year_prime = request.getparameter("year"); int year, id;  try{ year = integer.parseint(year_prime); }catch(exception e1){ year = 0;  }  string id_prime = request.getparameter("id"); try{ id = integer.parseint("id"); }catch(exception e2){ id = 0; }   if(name.length() != 0){ search = studentsmanager.getinstance().studbyname(name); }  if(year > 0){ search = studentsmanager.getinstance().studbyyear(year); }  if(id > 0){ search = studentsmanager.getinstance().studbyid(id); }   if(search != null){ %>  <html> <body bgcolor=#4aa02c> <center> <h2>student's data</h2> <table border="1" cellspacing="1" cellpadding="8" bgcolor= #ebdde2>  <tr> <td bgcolor= #ff9966><b>id</b></td> <td bgcolor= #ff9966><b>name</b></td> <td bgcolor= #ff9966><b>year</b></td> </tr> <tr> <td><%= search.getid()%></td> <td><%= search.getname()%></td> <td><%= search.getyear()%></td> </tr> </table> </center> </body> </html> <%}else{%>  <% string redirecturl = "mainmenu.html"; response.sendredirect(redirecturl); %>  <%}%> <%}%>

this foundstudent.jsp version of multiple forms (using hidden input) worked. (the javascript test little bit different, typed insted of had in beginning)

it searched name , year only. didn't search id (i had exception here <td><%= search.getid()%></td> i'm still trying see how deal it. id auto_increment primary key)

lines : search = studentsmanager.getinstance().studbyname(name); search student type object. (object student creaded in java file)

studentsmanager java class receives calls it's methods jsp. getinstance() creates instance of studentsmanager. method studbyname(name) receives parameter name form , searches in database.

so changed (java)script to:

<script language="javascript">             function validatesea(){                 if(document.entry2.name.value != ''){                     return true;                 }                  else                     if(document.entry2.year.value != ''){                        return true;                     }                  alert('please fill 1 field.');                 return false;                 }           </script>          </head>

which 1 form. i'm not sure if did correct thing, in foundstudents.jsp, receive parameters of form, test:

if((request.getparameter("year") != null)||(request.getparameter("name") != null)){          //reading params searchstudent form ................}

it works way.


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