javascript on asp.net control

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I want one example of how to validate asp.net textbox using javascript.
When I click the button,on clicking it first validate the text box after some action will be taken.

Posted 15-Mar-12 0:12am

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P.Salini · Answer 1 · 2012-03-15T00:19:00

javascript to validate login form

JavaScript

function Validation()
{
var userid=document.getElementById('<%=txtUserID.ClientID %>');
var pwd=document.getElementById('<%=txtPwd.ClientID %>');
if(userid.value=="")
{
alert("Please Enter UserID");
userid.focus();
return false;
}
if(pwd.value=="")
{
alert("Please Enter Password");
pwd.focus();
return false;
}
}

for button write the onclientclick in this way

ASP.NET

<asp:button id="btnLogin" runat="server" text="Submit" onclick="btnLogin_Click" onclientclick="javascript:return Validation();" xmlns:asp="#unknown" />