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Most of the asp.net developers knew that maxlength property of textbox will work even the multiline property set to true. But it doesnot work. To check or restrict maxlength of a multiline textbox you have to develop a javascript fucntion. In this article i will show you how you can limit or restrict multine textbox character limit using javascript.
If you are looking for textarea then click here.
Output Like:
The javascript function is given below:
<script type="text/javascript">
function ismaxlength(objTxtCtrl,nLength)
{
if (objTxtCtrl.getAttribute && objTxtCtrl.value.length>nLength)
objTxtCtrl.value=objTxtCtrl.value.substring(0,nLength)
if(document.all)
document.getElementById('lblCaption').innerText=objTxtCtrl.value.length +' Out Of '+nLength;
else
document.getElementById('lblCaption').textContent=objTxtCtrl.value.length +' Out Of '+nLength;
}
</script>
Call javascript from multiline TextBox:<textbox columns="50" id="txtMultiline" onkeyup="return ismaxlength(this,255)" rows="5" runat="server" textmode="MultiLine"></textbox>
<label id="lblCaption" style="font-family: Tahoma; font-size: 1em; font-weight: bold;"></label>
Complete HTML markup of my example page:<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Multiline_limit.aspx.cs" Inherits="Multiline_limit" %>
<!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>How to check mutiline textbox max length using javascript</title>
<script type="text/javascript">
function ismaxlength(objTxtCtrl,nLength)
{
if (objTxtCtrl.getAttribute && objTxtCtrl.value.length>nLength)
objTxtCtrl.value=objTxtCtrl.value.substring(0,nLength)
if(document.all)
document.getElementById('lblCaption').innerText=objTxtCtrl.value.length +' Out Of '+nLength;
else
document.getElementById('lblCaption').textContent=objTxtCtrl.value.length +' Out Of '+nLength;
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:TextBox ID="txtMultiline" runat="server" Rows="5" Columns="50" TextMode="MultiLine" onkeyup="return ismaxlength(this,255)" ></asp:TextBox>
<br />
<label id='lblCaption' style="font-family:Tahoma;font-size:1em;font-weight:bold"></label>
</div>
</form>
</body>
</html>
Script tested for:1. Internet Explorer
2. Mozilla Firefox
3. Opera
4. Google Chrome
2 comments:
Thanks a lot for this cool script!! :)
thanks for the script its good...
I WOULD BE DELIGHTED TO HEAR FROM YOU