ASP.NET textbox multiline maxlength

Very useful and simple javascript if you want to protect a multiline text box from enterting too many characters!

http://geekswithblogs.net/mahesh/archive/2007/12/27/asp.net-textbox.multiline-maxlength.aspx

function CheckCount(text,length)

 

{

 

      var maxlength = new Number(length); // Change number to your max length.

 

if(text.value.length > maxlength){

 

                text.value = text.value.substring(0,maxlength);

 

                alert(" Only " + maxlength + " characters allowed");

            }

}

<asp:TextBox ID="textBox" onKeyUp="javascript:Count(this,100);" onChange="javascript:Count(this,100);"  TextMode=MultiLine Columns="5" Rows="5" runat=server>

    </asp:TextBox>

Or something like that...