How to clear the text of a label or make label invisible in javascript

Question

1.00/5 (1 vote)

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hi All,

I have a label defined like this:
<asp:Label ID="lblWarning" runat="server" ForeColor="Red" Visible="False" Height="19px" Width="276px">

I tried to clear the text of a label like this :

XML

function ChangeProperty() {
            var b = document.getElementById('<%=lblWarning.ClientID%>');
if (b!=null)

            {
                b.innerText = "";
}

     }

This is not working.Please help.

Thanks.

Posted 10-Jun-15 9:16am

vidkaat

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Comments

Afzaal Ahmad Zeeshan 10-Jun-15 15:36pm

How is it not working? Check in the console to see what error is it giving, press F12 to get the developer tools active. Then tell us the error message to get help.

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Kornfeld Eliyahu Peter · Accepted Answer · 2015-06-10T11:06:00

When you set the Visible property of a server side control to false it not even rendered to the client, so your code will not found it at all (b will be null)...
If you want to make it visible/invisible on the client you have to play with client side attributes...
Set display or clear the display attribute...

ASP.NET

<asp:label id="lblWarning" runat="server" forecolor="Red" height="19px" width="276px" xmlns:asp="#unknown"></asp:label>

XML

function ChangeProperty() {
  var b = document.getElementById('<%=lblWarning.ClientID%>');
  if (b!=null)
  {
    if(b.style.display == "none")
    {
      b.style.display = "";
    }
    else
    {
      b.style.display = "none";
    }
  }
}