Refer below code, where we attach an event dynamically at
the time of page loads
<script language="javascript" type="text/javascript">
function fnTXTFocus(varname) {
var objTXT = document.getElementById(varname)
objTXT.style.borderColor = "Red";
}
function fnTXTLostFocus(varname) {
var objTXT = document.getElementById(varname)
objTXT.style.borderColor = "White";
}
function fnOnLoad() {
var t = document.getElementsByTagName('INPUT');
var i;
for (i = 0; i < t.length; i++) {
if (t[i].type == "text")
{
t[i].attachEvent('onfocus', new Function("fnTXTFocus('"
+ t[i].id + "')"));
t[i].attachEvent('onblur', new Function("fnTXTLostFocus('"
+ t[i].id + "')"));
}
}
}
</script>
<body onload="fnOnLoad()">
<form id="form1" runat="server">
<div>
<table>
<tr>
<td>
UserName ::
</td>
<td>
<asp:TextBox ID="txtUN" runat="server"></asp:TextBox>
</td>
</tr>
<tr>
<td>
Password ::
</td>
<td>
<asp:TextBox ID="txtPwd" runat="server"></asp:TextBox>
</td>
</tr>
<tr>
<td>
Confirm Password ::
</td>
<td>
<asp:TextBox ID="txtCpwd"
runat="server"></asp:TextBox>
</td>
</tr>
</table>
</div>
</form>
</body>
The above JavaScript:
Finds the list of textboxes and
stores it in an array.
Attaches the OnFocus and OnBlur
events to each textbox in the list.
So now, whenever a textbox gets/loses focus, the assigned
function will fire.
You can download a sample from here
