Character Limiting in TextBox in ASP.NET using jQuery and display red when reaches out of limit


Introduction

Download

Look at the images given blow that you frequently see on websites. In this post you are going to learn this.


Screen when character reaches out of limit:-


Follow the steps to create such system.

Step 1

Add the reference of the jQuery file in head section of web page, for example:

    <script type="text/javascript" src="Scripts/jquery-1.4.1.min.js"></script>

Step 2

Add the following jQuery method in head section of web page:

    <script type="text/javascript" language="javascript">
        $(document).ready(function () {
            var txt = $("textarea[id$=txtComments]");
            var txtMsg = $("label[id$=txtStatus]");
            $(txt).keyup(function () {
                var length = $(txt).val().length;
                $(txtMsg).text("Total " + length + " Characters out of 200.");
                $(txtMsg).css("background-color", length >= 201 ? "#FF0000" : "#FFFFFF");
            });
        });
    </script>

Step 3

Design the web page which contains TextBox, Label and a Button, for example:

    <div>
    Enter your comment
    <br />
    <asp:TextBox ID="txtComments" runat="server" TextMode="MultiLine" Height="164px" Width="298px"/>
    <br />
    <label id="txtStatus"></label>
    <br />
        <asp:Button ID="Button1" runat="server" Text="Submit" onclick="Button1_Click" />
    </div>

Now look at my complete coding.

Complete Code

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default2.aspx.cs" Inherits="Default2" %>

<!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>ASP.NET & jQuery Post</title>
    <script type="text/javascript" src="Scripts/jquery-1.4.1.min.js"></script>
    <script type="text/javascript" language="javascript">
        $(document).ready(function () {
            var txt = $("textarea[id$=txtComments]");
            var txtMsg = $("label[id$=txtStatus]");
            $(txt).keyup(function () {
                var length = $(txt).val().length;
                $(txtMsg).text("Total " + length + " Characters out of 200.");
                $(txtMsg).css("background-color", length >= 201 ? "#FF0000" : "#FFFFFF");
            });
        });
    </script>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    Enter your comment
    <br />
    <asp:TextBox ID="txtComments" runat="server" TextMode="MultiLine" Height="164px" Width="298px"/>
    <br />
    <label id="txtStatus"></label>
    <br />
        <asp:Button ID="Button1" runat="server" Text="Submit" onclick="Button1_Click" />
    </div>
    </form>
</body>
</html>

I recommend you to download the attached file and check it. I hope you like it. Thanks.

Comments

Post a Comment

Popular posts from this blog

Migrating database from ASP.NET Identity to ASP.NET Core Identity

Image
As you know ASP.NET Core Identity (table structure) is different from what we had earlier in ASP.NET Identity. Actually the identity system which we have today with .NET Core is very mature and continuously evolved be it ASP.NET Membership, ASP.NET Identity 1, ASP.NET Identity 2 and now ASP.NET Core Identity. Recently I had to migrate few application to ASP.NET Core and similar its identity database. Because the table schema is changed, i had to re-think and create migration script which I would like to share with you today. It is very simple and easy, just three step and I had everything ready: STEP 1 : Change name of existing tables STEP 2 : Create ASP.NET Core Identity tables STEP 3 : Migrate data from old tables (ASP.NET Identity) to new tables (ASP.NET Core Identity) Script:  https://gist.github.com/itorian/c699e8534b392a6c726ec66c48100072 You should also watch my video, where I demoed migration.
Read More »

Customize User's Profile in ASP.NET Identity System

Image
Note: You should read this post instead, I found below walkthrough will not work on ASP.NET Identity 2. I will re-work on this post soon. In this post you will learn how to customize User’s Profile and add some more fields like FirstName, LastName, EmailID etc with ASP.NET Identity System. In my last post I listed some of the great new features introduced with Identity system .
Read More »

Lambda two tables and three tables inner join code samples

In this blog post you will learn inner join using lambda queries. There will be two samples, in first sample you will see how you can join two tables and in second sample you will see how you can extend even further to join three tables and so on. I will sample in-memory data, but the same implementation will work with IQueryable (lazy query) too. Here's the code snippet:- namespace ConsoleApp1 {     class Program     {         static void Main()         {             var table1 = new List<Table1>();             table1.Add( new Table1 { Id = 1, Name = "Name 1" , Address = "Address 1" });             table1.Add( new Table1 { Id = 2, Name = "Name 2" , Address = "Address 2" });             table1.Add( new Table1 { Id = 3, Name = "Name 3" , Address = "Address 3" });             table1.Add( new Table1 { Id = 4, Name = "Name 4" , Address = "Address 4" });   
Read More »