Asp.net: Auto re-size textbox control

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Resize Asp.net multiline textbox automatically when we Enter text:



Asp.net MultiLine textbox:


In this post we want to create a simple Example of Asp.net text box control. When we enter data in this text box control we want to the length (re-size height and width) of text box. In this tutorial we give many example related to Asp.net text box as like Limitation of Characters in Asp.net Textbox  , Displaying the textbox value in javascript Messagebox , How to use alert and display textbox value by javascript , Introduction of ASP.NET Server Control Basics , jquery disable or Enable submit button after Textbox validation etc.


We take a Example here in this we consider a text box and try to Auto re-size it when we enter value in text box.

JavaScript function for resize Asp.net control:

Text box auto resize function.

function resizemultilineTextBox(txt) {
            txt.style.height = "1px";
            txt.style.height = (1 + txt.scrollHeight) + "px";
        }

Asp.net web page code with Textbox:


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

<!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 id="Head1" runat="server">
    <title></title>
   
    <script>
        function resizemultilineTextBox(txt) {
            txt.style.height = "1px";
            txt.style.height = (1 + txt.scrollHeight) + "px";
        }
    </script>
    <style type="text/css">
        .style1
        {
            color: #990000;
            text-decoration: underline;
            font-family: Arial, Helvetica, sans-serif;
        }
    </style>
</head>
<body>
    <form id="form2" runat="server">
        <div align="center" style="height: 123px; background-color: #6699FF">
        <h1 class="style1">Auto Resize Asp.net TextBox Control</h1>
            <table style="width: 494px">
                <tr>
                    <td>Enter Text Here: </td>
                    <td>                      
                        <asp:TextBox ID="txtDescription" runat="server"
                            onkeyup="resizemultilineTextBox(this)" TextMode="MultiLine" Width="212px"></asp:TextBox>
                      
                    </td>
                </tr>
            </table>
        </div>
    </form>
</body>
</html>



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