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JavaScript Enable/disable Button based on text in textboxes in asp.net

Introduction

Here I will explain how to enable/disable button whenever user enter text in textboxes using JavaScript in asp.net
Description
I have taken two textboxes and one button now I need to write functionality like to enable button if user enter text in two textboxes. For this we need to test whenever user entering text in textboxes at that time we need to raise onkeyup event for particular textbox. By default this event is not available for textbox in asp.net but we have a chance to use this event for textbox. Here I am enabling button whenever user enters text in two textboxes using JavaScript.
Design aspx page
<html xmlns=”http://www.w3.org/1999/xhtml”>
<head runat=”server”>
<title></title>
<script language=”javascript” type=”text/javascript”>
//function to enable button if two textboxes contains text
function SetButtonStatus(sender, target) {
var first = document.getElementById(‘<%=txtfirst.ClientID %>’);
var second = document.getElementById(‘<%=txtText.ClientID %>’);
//Condition to check whether user enters text in two textboxes

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or not

if ((sender.value.length >= 1 && first.value.length >= 1) && (sender.value.length >= 1 && second.value.length >= 1))
document.getElementById(target).disabled = false;
else
document.getElementById(target).disabled = true;
}
</script>
</head>
<body>
<form id=”form1″ runat=”server”>
<div>
<asp:TextBox ID=”txtfirst” runat=”server” onkeyup=”SetButtonStatus(this,’btnButton’)”></asp:TextBox>
<asp:TextBox ID=”txtText” runat=”server” onkeyup=”SetButtonStatus(this,’btnButton’)”></asp:TextBox>
<asp:Button ID=”btnButton” runat=”server” Text=”Button” Enabled=”false” />
</div>
</form>
</body>
</html>

Demo
Download sample code attached

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