Monday 24 February 2014

Count Number of Character in Multiline Textbox - Part I

Count Number of Character in Multiline Textbox - Part I

Hi Guys Today I am going to show you how to count Number of Character in a Multiline textbox and how to restrict the entry after the limit is reached..

Note: It works well with Chrome and IE but doesnt work with Firefox.

Design Part:

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "">

<html xmlns="">
<head runat="server">
    <title>Count Number of Character Multiline Textbox I</title>

    <script language = "Javascript">

        function tbLimit() {
            var tbObj = (typeof != 'undefined') ? : event.srcElement;

            if (tbObj.value.length == tbObj.maxLength * 1) return false;

        function tbCount(visCnt) {

            var tbObj = event.srcElement;
            if (tbObj.value.length > tbObj.maxLength * 1) tbObj.value = tbObj.value.substring(0, tbObj.maxLength * 1);

            if (visCnt) visCnt.innerText = tbObj.maxLength - tbObj.value.length;


<form id="form1" runat="server">

<asp:TextBox ID="TextBox1" runat="server" Columns="30" Rows="10" TextMode="MultiLine" ></asp:TextBox>
<br />
<asp:Label ID="Label1" runat="server"></asp:Label></div>



using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;

public partial class _Default : System.Web.UI.Page
    protected void Page_Load(object sender, EventArgs e)
        TextBox1.Attributes.Add("onkeypress", "return tbLimit();");
        TextBox1.Attributes.Add("onkeyup", "return tbCount(" + Label1.ClientID + ");");
        TextBox1.Attributes.Add("maxLength", "500");

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