Question

update records in jsp

Asked by: cofactor

I have a dynamic table as code below.

i input data into text field and then I add rows .

How do i submit these records to the servlet ?

basically , i want to update these rows( records) in the database .

what to do now ?

can you update my jsp code and tell me how to get these records in the servlet ?

i don't know whether there is any other way exists .

<html>
<head>
 
 
<title>Untitled</title>
<script type="text/javascript">
<!--
var selRow;
 
function AddItem() {
var i1,i2,f,t
f = document.forms["FFForm"]
i1 = f.elements["FIIt1"]
i2 = f.elements["FIIt2"]
i3 = f.elements["FIIt3"]
i4 = f.elements["FIIt4"]
 
t = document.getElementById("MyTable")
if ((i1.value!="")&&(i2.value!="")&&(i3.value!="")&&(i4.value!="")) AddRow(t,i1.value,i2.value,i3.value,i4.value)
}
 
function AddRow(t,i1,i2,i3,i4) {
var r,c
r = t.insertRow(t.rows.length)
 
r.style.backgroundColor='#E6E6E6' 
 
c = r.insertCell(0)
c1 = r.insertCell(1)
c2 = r.insertCell(2)
c3 = r.insertCell(3)
c.innerHTML = i1
c1.innerHTML = i2
c2.align = "center";
c2.innerHTML = i3
c3.innerHTML = i4
 
r.onclick = function() {
 if (selRow) selRow.style.backgroundColor = "#E6E6E6"
 r.style.backgroundColor = "yellow"
 selRow = r                                              
}
 
r.ondblclick=function() {
 if (selRow) selRow.style.backgroundColor = "yellow"
 r.style.backgroundColor = "#E6E6E6"
 selRow = r                                              
}
 
 
}
 
 
 
 
 
function RemoveItem(){
  if (selRow) {
           selRow.parentNode.removeChild(selRow)
           selRow = null
     }
}
// -->
</script>
</head>
<body >
<form action="" name="FFForm">
<table>
<tr>
<td>Description 1:<input type="text" name="FIIt1" /></td>
<td>Description 2: <input type="text" name="FIIt2" /></td>
<td>Description 3:<input type="text" name="FIIt3" /></td>
<td>Description 4:<input type="text" name="FIIt4" /></td>
</tr>
</table>
<input type="button" value="Add Item" onclick="AddItem()" />
<input type="button" value="Remove Item" onclick="RemoveItem()" />
</form>
<table  align=center summary="" id="MyTable" cellspacing="0" width="82%" border="1" bordercolor = "black">
<tr style="background-color: #003366"><th><font color="white">Description 1:</font></th>
<th><font color="white">Description 2:</font></th>
<th><font color="white">Description 3:</font></th>
<th><font color="white">Description 4:</font></th>
</tr>
</table>
</body>
</html>

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Asked On: 2008-12-22 at 07:29:52ID24003277
Topics: Java Standard Edition
,; WebApplications
,; Java Server Pages (JSP)
Participating Experts: 1
Points: 200
Comments: 5

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Answers

by: bluebelldiscoveryPosted on 2008-12-22 at 21:52:38ID: 23231585

Hi cofactor,

You can insert a hidden field beside the AddRow() function.
I make 3 changes to your code.

1. Define a variable to make the hidden field row unique
//////// NEW ////////
var id = 1;
//////// NEW ////////

2. Building the hidden field
//////// NEW ////////
c.innerHTML = i1 + "<input type='hidden' name='id"+id+"_1' value='"+i1+"'>";
c1.innerHTML = i2 + "<input type='hidden' name='id"+id+"_2' value='"+i2+"'>";
c2.align = "center";
c2.innerHTML = i3 + "<input type='hidden' name='id"+id+"_3' value='"+i3+"'>";
c3.innerHTML = i4 + "<input type='hidden' name='id"+id+"_4' value='"+i4+"'>";
id++;
//////// NEW ////////

3. Include a submit button
<input type="submit" value="Submit Now" />

To get the data from Servlet or JSP
Row 1 data will be from: id1_1, id1_2, id1_3, id1_4
Row 2 data will be from: id2_1, id2_2, id2_3, id2_4

You have to ignore
FIIt1, FIIt2, FIIt3, FIIt4

<html>
<head>
 
 
<title>Untitled</title>
<script type="text/javascript">
<!--
//////// NEW ////////
var id = 1;
//////// NEW ////////
var selRow;
 
function AddItem() {
var i1,i2,f,t
f = document.forms["FFForm"]
i1 = f.elements["FIIt1"]
i2 = f.elements["FIIt2"]
i3 = f.elements["FIIt3"]
i4 = f.elements["FIIt4"]
 
t = document.getElementById("MyTable")
if ((i1.value!="")&&(i2.value!="")&&(i3.value!="")&&(i4.value!="")) AddRow(t,i1.value,i2.value,i3.value,i4.value)
}
 
function AddRow(t,i1,i2,i3,i4) {
var r,c
r = t.insertRow(t.rows.length)
 
r.style.backgroundColor='#E6E6E6'
 
c = r.insertCell(0)
c1 = r.insertCell(1)
c2 = r.insertCell(2)
c3 = r.insertCell(3)
 
//////// NEW ////////
c.innerHTML = i1 + "<input type='hidden' name='id"+id+"_1' value='"+i1+"'>";
c1.innerHTML = i2 + "<input type='hidden' name='id"+id+"_2' value='"+i2+"'>";
c2.align = "center";
c2.innerHTML = i3 + "<input type='hidden' name='id"+id+"_3' value='"+i3+"'>";
c3.innerHTML = i4 + "<input type='hidden' name='id"+id+"_4' value='"+i4+"'>";
id++;
//////// NEW ////////
 
r.onclick = function() {
 if (selRow) selRow.style.backgroundColor = "#E6E6E6"
 r.style.backgroundColor = "yellow"
 selRow = r
}
 
r.ondblclick=function() {
 if (selRow) selRow.style.backgroundColor = "yellow"
 r.style.backgroundColor = "#E6E6E6"
 selRow = r
}
 
 
}
 
 
 
 
 
function RemoveItem(){
  if (selRow) {
           selRow.parentNode.removeChild(selRow)
           selRow = null
     }
}
// -->
</script>
</head>
<body >
<form action="http://www.bluebelldiscovery.com/TOOLS/echoform.jsp" name="FFForm">
	<table>
	<tr>
	<td>Description 1:<input type="text" name="FIIt1" /></td>
	<td>Description 2: <input type="text" name="FIIt2" /></td>
	<td>Description 3:<input type="text" name="FIIt3" /></td>
	<td>Description 4:<input type="text" name="FIIt4" /></td>
	</tr>
	</table>
	<input type="button" value="Add Item" onclick="AddItem()" />
	<input type="button" value="Remove Item" onclick="RemoveItem()" />
	<table  align=center summary="" id="MyTable" cellspacing="0" width="82%" border="1" bordercolor = "black">
	<tr style="background-color: #003366"><th><font color="white">Description 1:</font></th>
	<th><font color="white">Description 2:</font></th>
	<th><font color="white">Description 3:</font></th>
	<th><font color="white">Description 4:</font></th>
	</tr>
	</table>
 
	<input type="submit" value="Submit Now" />
 
</form>
 
</body>
</html>

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by: bluebelldiscoveryPosted on 2008-12-22 at 21:54:28ID: 23231590

You can do a submission from the modified sample code.
It will echo back what has been submitted.

by: cofactorPosted on 2008-12-23 at 09:34:11ID: 23235123

>>To get the data from Servlet or JSP
>>Row 1 data will be from: id1_1, id1_2, id1_3, id1_4
>>Row 2 data will be from: id2_1, id2_2, id2_3, id2_4

Can you show the Servlet code ? How does my servlet going to know , how many rows are coming ?

Description1 field will actually be a drop down box instead of a text box
I want to update my code so that it does not allow two duplicate rows by Description1 field in the dynamic table generated ...it will just show an alert box saying "No two row have duplicate Description1 field "

Where i need to modify my code to include this change ?

by: bluebelldiscoveryPosted on 2008-12-24 at 00:36:55ID: 23239098

Hi cofactor,

Here how.

1. (Html) I created a new function call "CheckKey(value)"
this function ensure there is no duplicate in col1 &
this is call in the beginning of AddItem().
[Code in Snippet Window]

2. (JSP/Servlet) I have another JSP file which first search for
col1 key then extract row data.
[Code below]

<%@ page import="java.util.*" %>
<%@ page import="java.io.*" %>

<%
            for (Enumeration e = request.getParameterNames() ; e.hasMoreElements() ;)
            {
                  String key = (String)e.nextElement();

                  // focus on key id?_1
                  String split[] = key.split("_");
                  if( split.length == 2 && split[1].equals("1") ) // check if this belong to col 1 data
                  {
                        // if yes found the subkey
                        String subkey = split[0];
                        String col1 = request.getParameter(subkey+"_1");
                        String col2 = request.getParameter(subkey+"_2");
                        String col3 = request.getParameter(subkey+"_3");
                        String col4 = request.getParameter(subkey+"_4");

                        // do somthing useful here
                        // doSomeHere(col1, col2, col3, col4);
                        out.println(col1+" | "+col2+" | "+col3+" | "+col4+"<br>");
                  }
            }
%>

X'mas.....

<html>
<head>
 
 
<title>Untitled</title>
<script type="text/javascript">
<!--
//////// NEW ////////
var id = 1;
//////// NEW ////////
var selRow;
 
function AddItem() {
var i1,i2,f,t
 
f = document.forms["FFForm"]
i1 = f.elements["FIIt1"]
i2 = f.elements["FIIt2"]
i3 = f.elements["FIIt3"]
i4 = f.elements["FIIt4"]
 
 
//////// NEW2 ////////
if(CheckKey(i1.value) == true)
{
	alert('Duplicate Not Allowed');
	return;
}
//////// NEW2 ////////
 
t = document.getElementById("MyTable")
if ((i1.value!="")&&(i2.value!="")&&(i3.value!="")&&(i4.value!="")) AddRow(t,i1.value,i2.value,i3.value,i4.value)
}
 
function AddRow(t,i1,i2,i3,i4) {
var r,c
r = t.insertRow(t.rows.length)
 
r.style.backgroundColor='#E6E6E6'
 
c = r.insertCell(0)
c1 = r.insertCell(1)
c2 = r.insertCell(2)
c3 = r.insertCell(3)
 
//////// NEW ////////
c.innerHTML = i1 + "<input type='hidden' id='id"+id+"_1' name='id"+id+"_1' value='"+i1+"'>";
c1.innerHTML = i2 + "<input type='hidden' id='id"+id+"_2' name='id"+id+"_2' value='"+i2+"'>";
c2.align = "center";
c2.innerHTML = i3 + "<input type='hidden' id='id"+id+"_3' name='id"+id+"_3' value='"+i3+"'>";
c3.innerHTML = i4 + "<input type='hidden' id='id"+id+"_4' name='id"+id+"_4' value='"+i4+"'>";
id++;
//////// NEW ////////
 
r.onclick = function() {
 if (selRow) selRow.style.backgroundColor = "#E6E6E6"
 r.style.backgroundColor = "yellow"
 selRow = r
}
 
r.ondblclick=function() {
 if (selRow) selRow.style.backgroundColor = "yellow"
 r.style.backgroundColor = "#E6E6E6"
 selRow = r
}
 
 
}
 
 
 
function RemoveItem(){
  if (selRow) {
           selRow.parentNode.removeChild(selRow)
           selRow = null
     }
}
 
//////// NEW2 ////////
function CheckKey(value)
{
	var i = 1;
	for(i=1; i<=id; i++)
	{
		var storeValue = document.getElementById("id"+i+"_1");
		if(storeValue != null )
		{
			if(storeValue.value == value)
			{
				return true;
			}
		}
	}
	return false;
}
//////// NEW2 ////////
// -->
</script>
</head>
<body >
<form action="http://www.bluebelldiscovery.com/TOOLS/extractform.jsp" name="FFForm">
	<table>
	<tr>
	<td>Description 1:<input type="text" name="FIIt1" /></td>
	<td>Description 2: <input type="text" name="FIIt2" /></td>
	<td>Description 3:<input type="text" name="FIIt3" /></td>
	<td>Description 4:<input type="text" name="FIIt4" /></td>
	</tr>
	</table>
	<input type="button" value="Add Item" onclick="AddItem()" />
	<input type="button" value="Remove Item" onclick="RemoveItem()" />
	<table  align=center summary="" id="MyTable" cellspacing="0" width="82%" border="1" bordercolor = "black">
	<tr style="background-color: #003366"><th><font color="white">Description 1:</font></th>
	<th><font color="white">Description 2:</font></th>
	<th><font color="white">Description 3:</font></th>
	<th><font color="white">Description 4:</font></th>
	</tr>
	</table>
 
	<input type="submit" value="Submit Now" />
 
</form>
 
</body>
</html>

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update records in jsp

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Java Standard Edition

WebApplications

Java Server Pages (JSP)

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