Question

Textbox, Label, Javascript

Asked by: abhinayp86

i Have few textboxes and one label which says "Value entered in" on my page.
So whenever something is entered in a text box, the label should display "Value entered in Textbox1"

when something is entered in other textbox, then label shud display "Value entered in Textbox1, Textbox5"
and so on.

I need javascript to implement this.

I can achieve this by using autopostback of textbox. But i have many Textboxes on my page and enabling
autopostback and hitting server everytime wud make my page sluggish

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Asked On
2009-11-04 at 06:30:31ID24870895
Topics

Programming for ASP.NET

,

Microsoft Visual Basic.Net

,

JavaScript

Participating Experts
3
Points
500
Comments
10

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Answers

 

by: gurvinder372Posted on 2009-11-04 at 06:36:25ID: 25739656

Please use the onchange change event of the TextBox input field to call a javascript method. In that JavaScript method, you can set the text value of the label to the message you want to display on the Label.
You can use the following link for reference
http://www.w3schools.com/tags/tag_input.asp

 

by: bastianrPosted on 2009-11-04 at 07:18:32ID: 25740157

Try this:


<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Textbox, Label, Javascript</title>
<script type="text/javascript">
<!--
function updateMessage(theElem){
var msg = 'Value entered in ';
var msgElem = document.getElementById('msgContainer');
msg += theElem.id;
msgElem.innerHTML = msg;
}
// -->
</script>
</head>
<body>
<form action="" method="get">
<p>
<label for="TextBox1">Text Box 1</label>
  <input name="TextBox1" type="text" id="TextBox1" onchange="updateMessage(this)" />
</p>
<p>
<label for="TextBox2">Text Box 2</label>
  <input name="TextBox2" type="text" id="TextBox2" onchange="updateMessage(this)" />
</p>
<p id="msgContainer">&nbsp;</p>
</form>
</body>
</html>

 

by: mplungjanPosted on 2009-11-04 at 07:59:34ID: 25740635

I think

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Textbox, Label, Javascript</title>
<script type="text/javascript">
<!--
function updateMessage(theForm){
  var msg = "";
  for (var i=0, n=theForm.elements.length;i<n;i++) {
    var elem = theForm.elements[i];
    if (elem.type=="text" && elem.value!="") msg += ","+elem.id;
  }
  if (msg) msg = "Value entered in "+msg.substring(1)    
  document.getElementById('msgContainer').innerHTML = msg;
}
window.onload=function() {
  updateMessage(document.forms[0])
}
// -->
</script>
</head>
<body>
<form action="" method="get">
<p>
<label for="TextBox1">Text Box 1</label>
  <input name="TextBox1" type="text" id="TextBox1" onkeyUp="updateMessage(this.form)" />
</p>
<p>
<label for="TextBox2">Text Box 2</label>
  <input name="TextBox2" type="text" id="TextBox2" onkeyUp="updateMessage(this.form)" />
</p>
<p id="msgContainer">&nbsp;</p>
</form>
</body>
</html>

                                              
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by: abhinayp86Posted on 2009-11-04 at 11:06:06ID: 25742683

Actually i need to "append" it to same label. So i did it this way

script type="text/javascript">

function updateMessage(s){

var msgElem = document.getElementById('Querylbl');

msgElem.innerHTML += s;
}

</script>

<asp:TextBox ID="txtDwgTitleBlock" runat="server" onchange="updateMessage('Document Title ;')></asp:TextBox>

<asp:TextBox ID="txtprjcode" runat="server" onchange="updateMessage('Project Code ; ') ></asp:TextBox>

<asp:Label ID="Querylbl" runat="server" >Your Entered values for</asp:Label>

But i have a problem
When the user enters something in both txtboxes txtDwgTitleBlock and txtprjcode, the label would display
   "Your Entered values for Document Title ; Project Code ;"   Good till now

And now if the user edits his text in any one of the txtboxes say txtDwgTitleBlock, The label would be
"Your Entered values for Document Title ; Project Code ; Document Title ;"

I dont want it to be appended again.

Had it been with using Textbox autopost back, i wud have did it this way

    Protected Sub txtDwgTitleBlock_TextChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles txtDwgTitleBlock.TextChanged
     
        If Not Querylbl.Text.Contains("Drawing Title") Then
            Querylbl.Text = Querylbl.Text + " Drawing Title; "
           
        End If
    End Sub


Any idea How to do it with javascript?

And also i think we cant use the contents of this updated label from code behind(in .vb file, Querylbl.text contains nothing) Is there anyway to retriew it?

 

by: mplungjanPosted on 2009-11-04 at 11:15:02ID: 25742785

Yes: Use my code

 

by: abhinayp86Posted on 2009-11-04 at 11:44:00ID: 25743091

All u used were html controls.
Can u do it for asp.net controls?

Thanks

 

by: bastianrPosted on 2009-11-04 at 12:12:49ID: 25743420

"I dont want it to be appended again."

In my example the var msg is re-instantiated every time the function is called. In your example it could be set to
var msg = 'Your Entered values for ';

You could then update it as follows without the appending problem:
msgElem.innerHTML = msg + s;

"Can u do it for asp.net controls?"

The JavaScript doesn't care whether your code is static HTML or generated by ASP.NET controls. It looks for the elements in the HTML emitted to browser regardless of how it got there.

 

by: abhinayp86Posted on 2009-11-04 at 12:18:33ID: 25743480

Ya got it work this way...
But how can i retrieve the label's value in the codebehind file in a asp buttonclick event?.

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>Untitled Page</title>
     <script type="text/javascript">
<!--
function updateMessage(theForm,s){
  var msg = "";
  for (var i=0, n=theForm.elements.length;i<n;i++) {
    var elem = theForm.elements[i];
    if (elem.type=="text" && elem.value!="") msg += ","+elem.id;
  }
  if (msg) msg = "Value entered in "+msg.substring(1)    
  document.getElementById('qlb').innerHTML = msg;
}
window.onload=function() {
  updateMessage(document.forms[0])
}
// -->
</script>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:TextBox ID="txtsss" runat="server" onkeyUp="updateMessage(this.form)"></asp:TextBox>
        <asp:TextBox ID="TextBox1" runat="server" onkeyUp="updateMessage(this.form)"></asp:TextBox>
               <asp:Button ID="Button1" runat="server" Text="Button" /> 
    <asp:Label ID="qlb" runat="server"></asp:Label> 
    </div>
    </form>
</body>
</html>
                                              
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by: bastianrPosted on 2009-11-04 at 12:47:20ID: 25743728

The JavaScript can't read anything from your code-behind file, only from the HTML emitted to the browser.

Not sure I totally understand what you're after. Is there logic in your codebehind file that generates different values for your label? Is there a reason not to hard-code the value into the JS file?

 

 

by: mplungjanPosted on 2009-11-04 at 21:11:40ID: 25746934

And the server can read the field values itself when you submit or ajax the field values

20120131-EE-VQP-002

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