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How to make a label disappear after a certain length of time?

Posted on 2008-10-30
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Last Modified: 2012-06-27
I have an asp.net label control which displays messages when users do certain operations on my page. This label control is set to visible="false" until it needs to be displayed, and then programmatically it's visibility is set to "true". When this happens, I don't want it to stay there, I want it to disappear after 5 seconds. What's the best way to do this? Is there an AJAX control that already does this, or do I need some custom Javascript? And if it is Javascript that I need, how do I get the function to fire every time the label's visibility is set to true?
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Question by:CitySec
5 Comments
 
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Expert Comment

by:silemone
ID: 22843325
i think you have to use the asp ajax controls to do this...there is a timer that you can use...there...
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Expert Comment

by:silemone
ID: 22843402
oops...it's not part of the asp ajax control...It's the UpdateProgress...I'm thinking that if you set it for 5 seconds, then you can cause another event to happen after its finished...say:  have an event in you page called makeInvisible().  in the makeInvisible call a <asp:button.....style="display:none;"> button which will make label invisible...now, it's important that the label be placed inside of a UpdatePanel and the trigger for that updatePanel be that invisible button...
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tiagosalgado earned 500 total points
ID: 22843405
You can use setTimeOut() javascript function to hide your label.
Above code, will set your label text and after 5 seconds the label will disappear.
 

<asp:ScriptManager runat="server" ID="sm1" />
        <asp:UpdatePanel runat="server" ID="up1">
            <ContentTemplate>
                <asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
                <asp:Button ID="Button1" runat="server" Text="Button" />
            </ContentTemplate>
        </asp:UpdatePanel>
 
And at code-behing you can have something like this:
 
Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
        Label1.Text = "my label text"
        ScriptManager.RegisterClientScriptBlock(Me.Page, Me.GetType, "script", "window.setTimeout(function() { document.getElementById('" + Label1.ClientID + "').style.display = 'none' },5000);", True)
    End Sub

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LVL 13

Expert Comment

by:TechTiger007
ID: 22843413
you can hide the label using javascript

add this code after you make label visible in code behind file
ClientScript.RegisterStartupScript("HideLabel()",<time in milliseconds>,true);

//add this function to the page
function HideLabel()
{
document.getElementById("LabelID").style = "display:none";
}

(there could be syntax error)
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Author Comment

by:CitySec
ID: 22843483
That was the first solution I tried because it was the easiest to paste and required only one line of code. The other solutions may work too, but I didn't try them. One last question, can I make the label fade out instead of disappear at once?
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