how to assign value to label at runtime

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I want to assign value to label at runtime using onkeypress event. For this I wrote the following java script:

function Keypress()
{
    var keyId=document.getElementById(&#39;ctl00_ContentPlaceHolderTM_txtTitle&#39;).value;
  alert(keyId);        document.getElementById(&#39;ctl00_ContentPlaceHolderTM_lblAddTitle&#39;)=keyId;
}

This java script works on key press event but not assigns a value to the label. Why?

Posted 27-Jan-11 21:59pm

maya saste

Updated 27-Jan-11 22:03pm

JF2015

v2

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**R. Giskard Reventlov** · Answer 1 · 2011-01-27T22:06:00

Solution 1

Try something along the lines of:

document.getElementById("ctl00_ContentPlaceHolderTM_lblAddTitle").innerText = keyId;

Posted 27-Jan-11 22:06pm

R. Giskard Reventlov

Comments

Sandeep Mewara 28-Jan-11 4:38am

or innerHTML property to assign the value.

maya saste 28-Jan-11 4:38am

I try this way but value is not assign to label.

sapien4u 1-Feb-11 4:17am

innerText will work but it will be reset on postback.
Try with my answer posted below.

gaurav_patel · Answer 2 · 2011-01-28T00:33:00

Solution 2

Try this

document.getElementById('ctl00_ContentPlaceHolderTM_lblAddTitle').innerHtml = keyId

Posted 28-Jan-11 0:33am

gaurav_patel

Comments

sapien4u 1-Feb-11 4:16am

innerHtml is not working in my case

jagadesh437 21-Feb-13 4:11am

innerHtml and innerText both are working fine but my Label properties are changing

sapien4u · Answer 3 · 2011-01-31T21:57:00

The issue is, when we try to set value to the label from javascript, at first it will accept the new value but on post back, it will be changed to its previous value.

But onkeypress event, it will work untill there is a post back.
When we call a return false to avoid postback on button click the value will stay untill the next postback.

Please try with the following code (It is working, but resets on postback):

Use the following JavaScript functions:

C#

function ChangeText(retval) {
            document.getElementById("testLabel").innerText = "New Text (onclick) : Return Value - " + retval;
            return retval;
        }
        function keyPress() {
            document.getElementById("testLabel").innerText = "New Text (onkeypress)";
        }

Add the following controls to test the function:

XML

<asp:Label ID="testLabel" runat="server" Text="ASP LABEL CONTROL"></asp:Label>
        <input type="button" value="HTML btn retval true" onclick="ChangeText(true);" />
        <input type="button" value="HTML btn retval false" onclick="ChangeText(false);" />
        <asp:Button ID="testButton" runat="server" Text="ASP btn retval false" OnClientClick="javascript:return ChangeText(false);" />
        <asp:Button ID="testButton2" runat="server" Text="ASP btn retval true" OnClientClick="javascript:return ChangeText(true);" />
        <asp:TextBox ID="testTextBox" runat="server" onkeypress="javascript:keyPress();"></asp:TextBox>

Please feel free to revert back after testing and add your comments on it. :)
:thumbsup: