ASP label value assigned in client side not appearing in postback

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HI All

I am facing a problem in getting the label value after post back.

I have a label, and i am changing the value in client side ( using jquery , javascript )

when i do post back by button click event, i am not getting the newly assigned value of the label text in code behind ( .cs file )

How to resolve it..

I dont wanna use Hidden field..

code::::::

XML

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
    <script src="JQuery.js" type="text/javascript"></script>

    <script type="text/javascript">
        $(function () {

            $('#btn').click(function (e) {

                $('#lbl').text('value changed from client side');

                return true;
            });

        });
    </script>

</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:Label ID="lbl" Text="sometext" runat="server"></asp:Label>
        <br />
        <asp:Button ID="btn" Text="submit" runat="server" onclick="btn_Click" />
    </div>
    </form>
</body>
</html>

C#

protected void btn_Click(object sender, EventArgs e)
        {
            string lblvalue = lbl.Text;
        }

Any ideas ??

Thanks in advance...

Posted 27-Nov-13 7:56am

Karthik_Mahalingam

Updated 22-Apr-19 4:17am

v2

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Thanks7872 27-Nov-13 23:03pm

Where is the code?

Karthik_Mahalingam 27-Nov-13 23:17pm

code added ......

3 solutions

Solution 3

I just did this exact thing. Here's what I did to pull the value I'm setting to my label...

For each label you are updating, you need to also create a hidden field. A simple html hidden field will suffice.

<asp:Label runat="server" ID="cust1" Text="" AutoPostBack="false"></asp:Label>
<input type="hidden" name="hidCust1" id="hidCust1" runat="server" enableviewstate="true" />

Ensure that "enableviewstate" is set to "true" for the hidden field.

In your javascript, after you set the value of the label:

if (cust1.innerHTML == '') {
    cust1.innerHTML = desc;
    icust1.style.visibility = 'visible';
}

also set the value of the hidden field:

document.getElementById("hidCust1").value = cust1.innerText

Then, in your code behind, simple request the value of the hidden field:

sRetVal = hidCust1.Value

Posted 22-Apr-19 4:17am

Reaus

Solution 1

You can use a viewstate to retain the value of the label as explained here

Posted 27-Nov-13 8:22am

AlexDpars

Comments

Karthik_Mahalingam 27-Nov-13 21:38pm

No dude, its not working. Do u have sample??

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Thanks7872 · Accepted Answer · 2013-11-27T17:21:00

Its important to know how the Client and Server side code works. Have a look at this link : Set Text property of asp:label in Javascript PROPER way[^]

Exactly the same problem is explained there. I don't know why you don't want to use hiddenfield/Viewstate etc. Take a look at example code i created:

C#

<asp:HiddenField ID="Hidden1" runat="server" />    
<asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>

Code behind:

C#

Page.ClientScript.RegisterStartupScript(this.GetType(), "change label", "<script type='text/javascript'>change_label()</script>");
Label1.Text = Hidden1.Value;//This is how you will get the updated value

JavaScript:

C#

<script type="text/javascript">
function change_label() {      
    document.getElementById("Label1").innerText = "This is updated value";           
}   
</script>