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Khushbu Arora
List of checkboxes
2 Answer(s)      4 years ago
Posted in : JSP-Servlet


Hi!

I making a list of time-slots with a checkbox against every such time-slot in a JSP page. My requirement is that when one or more checkboxes are checked and the delete button is clicked, then the selected time slots should be deleted. The time slots are getting added in ArrayList but they are not getting removed. The code is=


<center>
<table border="0" width="100%" height="100%" background="images/img1.jpg" style="background-repeat:repeat-x, repeat-y; background-position:top">
<tr>
<td width="10%" height="100%">&nbsp;</td>
<td width="80%" height="100%">
<table border="0" width="100%" height="100%">
<tr>
<td>
<table border="0" width="100%" height="100%" background="images/header-fill1.jpg" cellspacing="0">
<form action="" name="SchMeetForm">
<tr>
<th colspan="4">
<u>Schedule a Meeting</u>
</th>
<th align="right">
<input type="submit" value="Send" class="but">
</th>
</tr>
<tr align="left">
<td>
Subject:
</td>
<td>
<input type="text" name="subject">
</td>
<td>
&nbsp;
</td>
<td>
Where:
</td>
<td>
<select>
<%
MsdsConnection msdsconn;
Statement stmt=null;
ResultSet rs=null;
msdsconn=new MsdsConnection();
msdsconn.initialize(getServletContext());
msdsconn.establishConn();
Connection conn=msdsconn.getMsdsConnection();
stmt=conn.createStatement();
rs = stmt.executeQuery("select loc_name from location");
while(rs.next())
{
%>
<option> <%=rs.getString(1)%> </option>
<% } %>
</select>
</td>
</tr>
<tr align="left">
<td>
Date:
</td>
<td>
<script>DateInput('orderdate', true, 'DD-MON-YYYY')</script>
<!--<input type="button" onClick="alert(this.form.orderdate.value)" value="Show date value passed">-->
</td>
<td>
&nbsp;
</td>
<td>
Chair:
</td>
<td>
<select>
<%
rs = stmt.executeQuery("select emp_name from employee");
while(rs.next())
{
%>
<option> <%=rs.getString(1)%> </option>
<% } %>
%>
</select>
</td>
</tr>
</form>
<form action="#" name="TSForm">
<tr align="left">
<td>
When &nbsp;&nbsp;
Starts:
</td>
<td>
<input type="text" name="startsHr" size="1" maxlength="2" OnKeyPress="return validateNumeric()"/>:
<input type="text" name="startsMin" size="1" maxlength="2" OnKeyPress="return validateNumeric()"> &nbsp; [24HH:MM]
</td>
</tr>
<tr align="left">
<td>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
Ends:
</td>
<td>
<input type="text" name="endsHr" size="1" maxlength="2" OnKeyPress="return validateNumeric()">:
<input type="text" name="endsMin" size="1" maxlength="2" OnKeyPress="return validateNumeric()"> &nbsp; [24HH:MM] &nbsp;
<input type="submit" name="save" value="Save" class="but" >
</td>
</tr>
</form>
</table>
</td>
</tr>
<%
String btn=request.getParameter("save");
if(btn!=null)
{
%>
<tr>
<td>
<table bgcolor="#F8F8FF" cellspacing="0" border="0" border="0" width="100%" height="100%">
<tr align="center">
<th align="left">
<u> Initiated Time Slots: </u>
</th>
</tr>
<tr align="left">
<td>
<%
String sh=request.getParameter("startsHr");
String sm=request.getParameter("startsMin");
String eh=request.getParameter("endsHr");
String em=request.getParameter("endsMin");

if(sh!=""&&sm!=""&&eh!=""&&em!="")
{
int nsh=Integer.parseInt(sh);
int nsm=Integer.parseInt(sm);
int neh=Integer.parseInt(eh);
int nem=Integer.parseInt(em);

if(nsh<0 || nsh>23 || nsm<0 || nsm>60 || neh<0 || neh>23 || nem<0 || nem>60)
{ %>
Invalid Time!

<% }
else
{
al.add(index);
al.add(sh);
al.add(sm);
al.add(eh);
al.add(em);
index++;
Iterator itr = al.iterator();
while(itr.hasNext())
{
%>
<input type="checkbox" name="ts" value="<%=itr.next()%>">
<%=itr.next()%>:<%=itr.next()%>&nbsp;-&nbsp;<%=itr.next()%>:<%=itr.next()%>
<br>
<%
}
}

String d=request.getParameter("delete");
if(d!=null)
{
String[] p;
p=request.getParameterValues("ts");
if(p!=null)
{
for (int i = 0; i < p.length; i++)
{
int j;
for(j=0;j<al.size();j++)
{
if(al.get(j)==p[i])
break;
}
for(int k=0;k<5;k++)
{
al.remove(j);
}
}
}
}
} %>
</td>
</tr>
<tr align="left">
<td>
<input type="button" value="Remove" class="but" name="delete">
</td>
</tr>
</tr>
</table>
</td>
</tr>
<% } %>
</table>
</td>
<td width="10%" height="100%">&nbsp;</td>
</tr>
</table>
</center>

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View Answers

April 16, 2010 at 5:41 PM


Hi Friend,

We have modified you code, check it:

<%@page import="java.sql.*"%>
<%@page import="java.util.*"%>
<center>
<table border="0" width="100%" height="100%" background="images/img1.jpg" style="background-repeat:repeat-x, repeat-y; background-position:top">
<tr>
<td width="10%" height="100%">&nbsp;</td>
<td width="80%" height="100%">
<table border="0" width="100%" height="100%">
<tr>
<td>
<table border="0" width="100%" height="100%" background="images/header-fill1.jpg" cellspacing="0">
<form action="" name="SchMeetForm">
<tr>
<th colspan="4">
<u>Schedule a Meeting</u>
</th>
<th align="right">
<input type="submit" value="Send" class="but">
</th>
</tr>
<tr align="left">
<td>
Subject:
</td>
<td>
<input type="text" name="subject">
</td>
<td>
&nbsp;
</td>
<td>
Where:
</td>
<td>
<select>
<%
MsdsConnection msdsconn;
Statement stmt=null;
ResultSet rs=null;
msdsconn=new MsdsConnection();
msdsconn.initialize(getServletContext());
msdsconn.establishConn();
Connection conn=msdsconn.getMsdsConnection();
stmt=conn.createStatement();
rs = stmt.executeQuery("select loc_name from location");
while(rs.next())
{
%>
<option> <%=rs.getString(1)%> </option>
<% } %>
</select>
</td>
</tr>
<tr align="left">
<td>
Date:
</td>
<td>
<script>DateInput('orderdate', true, 'DD-MON-YYYY')</script>
<!--<input type="button" onClick="alert(this.form.orderdate.value)" value="Show date value passed">-->
</td>
<td>
&nbsp;
</td>
<td>
Chair:
</td>
<td>
<select>
<%
rs = stmt.executeQuery("select name from employee");
while(rs.next())
{
%>
<option> <%=rs.getString(1)%> </option>
<% } %>
%>
</select>
</td>
</tr>
</form>
<form action="#" name="TSForm">
<tr align="left">
<td>
When &nbsp;&nbsp;
Starts:
</td>
<td>
<input type="text" name="startsHr" size="1" maxlength="2" OnKeyPress="return validateNumeric()"/>:
<input type="text" name="startsMin" size="1" maxlength="2" OnKeyPress="return validateNumeric()"> &nbsp; [24HH:MM]
</td>
</tr>
<tr align="left">
<td>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
Ends:
</td>
<td>
<input type="text" name="endsHr" size="1" maxlength="2" OnKeyPress="return validateNumeric()">:
<input type="text" name="endsMin" size="1" maxlength="2" OnKeyPress="return validateNumeric()"> &nbsp; [24HH:MM] &nbsp;


April 16, 2010 at 5:42 PM


continue..

<input type="submit" name="save" value="Save" class="but" >
</td>
</tr>
</form>
</table>
</td>
</tr>
<%
String btn=request.getParameter("save");
if(btn!=null)
{
%>
<tr>
<td>
<table bgcolor="#F8F8FF" cellspacing="0" border="0" border="0" width="100%" height="100%">
<tr align="center">
<th align="left">
<u> Initiated Time Slots: </u>
</th>
</tr>
<tr align="left">
<td>
<%
String sh=request.getParameter("startsHr");
String sm=request.getParameter("startsMin");
String eh=request.getParameter("endsHr");
String em=request.getParameter("endsMin");
int index=0;

ArrayList al=new ArrayList();
if(sh!=""&&sm!=""&&eh!=""&&em!="")
{
int nsh=Integer.parseInt(sh);
int nsm=Integer.parseInt(sm);
int neh=Integer.parseInt(eh);
int nem=Integer.parseInt(em);

if(nsh<0 || nsh>23 || nsm<0 || nsm>60 || neh<0 || neh>23 || nem<0 || nem>60)
{ %>
Invalid Time!

<% }
else
{

al.add(index);
al.add(sh);
al.add(sm);
al.add(eh);
al.add(em);
index++;
Iterator itr = al.iterator();
while(itr.hasNext())
{
%>
<input type="checkbox" name="ts" id="ts" value="<%=itr.next()%>">
<label id="div"><%=itr.next()%>:<%=itr.next()%>&nbsp;-&nbsp;<%=itr.next()%>:<%=itr.next()%></label>
<br>
<%
}
}

String d=request.getParameter("delete");
if(d!=null)
{
String[] p;
p=request.getParameterValues("ts");
System.out.println(p);
if(p!=null)
{
for (int i = 0; i < p.length; i++)
{
int j;
for(j=0;j<al.size();j++)
{
if(al.get(j)==p[i])
break;
}
for(int k=0;k<5;k++)
{
al.remove(j);
}
}
}
}
} %>
</td>
</tr>
<tr align="left">
<td>
<input type="button" value="Remove" onclick="del();" class="but" name="delete">
</td>
</tr>
</tr>
</table>
</td>
</tr>
<% } %>
</table>
</td>
<td width="10%" height="100%">&nbsp;</td>
</tr>
</table>
</center>
<script>
function del(){

if (document.getElementById) {
document.getElementById('ts').style.visibility = 'hidden';
document.getElementById('div').style.visibility = 'hidden';
}
}
</script>

Thanks


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List of checkboxes - JSP-Servlet
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