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Auto-scroll to bottom of multiline RadTextBox

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5 Answers, 1 is accepted

answered on 20 Apr 2010, 05:51 PM

Pavilina,

The difference between the example and what I'm trying to do is that in the example, you're manually typing into the textbox and what I need to do is programmatically add text to the textbox while keeping the last line added visible. There seems to be a difference in behavior when adding text to the textbox programmatically versus typing into the textbox manually.

Here's a simple example of what I'm talking about:

TestPage.aspx

    
            <%@ Page Language="C#" AutoEventWireup="true" CodeBehind="TestPage.aspx.cs" Inherits="TestWebApp.TestPage" %> 
        
            <%@ Register Assembly="Telerik.Web.UI" Namespace="Telerik.Web.UI" TagPrefix="telerik" %> 
        
            <!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></title>  
        
            </head> 
        
            <body> 
        
                <form id="form1" runat="server">  
        
                <asp:ScriptManager runat="server" ID="ScriptManager1" /> 
        
                <div> 
        
                    <asp:Timer runat="server" ID="timer1" Interval="500" OnTick="timer1_Tick" /> 
        
                    <telerik:RadTextBox ID="rtbMultiLine" runat="server" TextMode="MultiLine">  
        
                    </telerik:RadTextBox> 
        
                </div> 
        
                </form> 
        
            </body> 
        
            </html>

TestPage.aspx.cs

    
            using System;  
        
            using System.Web;  
        
            using System.Web.UI;  
        
            using System.Web.UI.WebControls;  
        
            namespace TestWebApp  
        
            {  
        
                public partial class TestPage : System.Web.UI.Page  
        
                {  
        
                    protected void Page_Load(object sender, EventArgs e)  
        
                    {  
        
                    }  
        
                    protected void timer1_Tick(object sender, EventArgs e)  
        
                    {  
        
                        rtbMultiLine.Text += "Tick\n";  
        
                    }  
        
                }  
        
            }

When I run this, once the textbox is filled, it keeps going past the end of the textbox but does not keep the last added line visible. I've tried various ways of trying to accomplish this with javascript but I haven't been able to get any examples I've seen online to work (I think mostly because every example I see deals with static text and not constantly updating like this). Let me know if you need any more from me in trying to figure this out. I've already spent a day on this without luck =/

Thanks,
Chad

Accepted

answered on 23 Apr 2010, 02:21 PM

multiline-textbox.zip

Hello Chad,

Please, find attached a simple working application which handles the desired functionality. Give it a try and let me know if it works as expected.

I hope this helps.

Best wishes,
Pavlina
the Telerik team

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