In this post we are going to see that how to formatting the
number entered in the server side text box.
<%@ Page Language="vb" AutoEventWireup="false" CodeBehind="WebForm1.aspx.vb" Inherits="Blogging.WebForm1" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<script type="text/javascript">
// This function is called when the focus moved from Text Box
function formatNumber() {
// Get the Controls value
var strAmount = document.getElementById("<%=txtAmount.ClientID%>").value;
// Replace the prefix and suffix spaces
var dblAmount = strAmount.replace(/^s+|s+$/g, '');
//check the input is not a empty string
if (dblAmount != '') {
// check the input is a valid number
if (isNaN(dblAmount)) {
// Alert the User
alert("Please enter only whole number");
// Clear the values
document.getElementById("<%=txtAmount.ClientID%>").value = "";
}
else {
// Append zeros
var strAmount = dblAmount + "." + "00";
//strAmount = strAmount.replace(/^s+|s+$/g, '');
document.getElementById("<%=txtAmount.ClientID%>").value = strAmount;
}
}
}
// Called when the focus set on the Text Box
function removeZeros() {
// Get the Controls value
var strAmount = document.getElementById("<%=txtAmount.ClientID%>").value;
// Replace the prefix and suffix spaces
strAmount = strAmount.replace(/^s+|s+$/g, '');
// Replace the Zeros and Dot
var dblAmount = strAmount.replace(".00", "");
//check the input is a valid number
if (dblAmount != '') {
// check the input is a valid number
if (isNaN(dblAmount)) {
alert("Please enter only whole number");
}
else {
// Assign the value to text box
document.getElementById("<%=txtAmount.ClientID%>").value = dblAmount;
}
}
}
</script>
</head>
<body>
<form id="form1" runat="server">
Enter A Whole Number :
<asp:TextBox ID="txtAmount" runat="server" onblur="formatNumber();" onfocus="removeZeros();">
</asp:TextBox>
</form>
</body>
</html>
Let’s have a look at that line:
<asp:TextBox ID="txtAmount" runat="server" onblur="formatNumber();" onfocus="removeZeros();"></asp:TextBox>
Which declares ASP.Net text box, with 2 client side events “onblur” and “onfocus”.
Onfocus – used to call a javascript function when the focus
set on that control. That is when you click on the text box this will fired.
Onblur – Used to call a javascript function when the focus
is moved to next control. When the user press tab key this event triggered.
In the javascript functions “formatNumber” and “removeZeros”
I have used some regular expression to remove the leading and trailing spaces.
To run this program, just copy and paste that code in a webform and hit F5.
Please go thru the comments in the javascript for better understanding.
Provide your valuable comments to improve my articles.
Hope this helps a bit!
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