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up vote 3 down vote favorite

when every i call a Javascript function from asp:button onclick event i got this error message

HTML

<asp:Button ID="btnFromCalOpen" runat="server" Text=" &gt; "  onclick="ShowCal()"  CssClass = "SElementHide" />

Javascript

function ShowCal() {

    var elem = document.getElementById('MainContent_CalendarFrom');
    if (elem.visibility = "hidden" )
    {
    elema.style.visibility = "visible";
    elema.style.display = "block";
    }
    else
    {
    elema.style.visibility = "hidden";
    elema.style.display = "none";
    }
}

Error Compiler Error Message: BC30456: 'ShowCal' is not a member of 'ASP.default_aspx'.

Please Help

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4 Answers

up vote 12 down vote accepted

Use OnClientClick to have your ASP.NET button run a JavaScript method before calling its server-side method. OnClick specifies the server side method to run.

<asp:Button ID="btnFromCalOpen" runat="server" 
         Text=" &gt; "  CssClass = "SElementHide" 
         OnClientClick="ShowCal()" />
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up vote 0 down vote

use OnClientClick. onclick is for a server side handler.

also you need to check elem.style.visibility.

also you're creating elem in your js function and then trying to access elema.

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up vote 0 down vote

Have you tried the OnClientClick property?

http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.button.onclientclick.aspx

Also, this does not look correct:

if (elem.visibility = "hidden")

Should be closer to:

if (elem.style.visibility == "hidden")

Are you also looking for the button to prevent post back? Then, return false in your ShowCal javascript function.

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up vote 0 down vote

Can We stop Server postback when we are calling javscript function on Asp button click

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I think It done automatically, Client first, Sever Second ... –  Frank Myat Thu Aug 16 '12 at 3:50

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