Updatepanel - need to update textbox several times after button_click

Question

0.00/5 (No votes)

See more:

I have searched and tried all of the examples that I could find for getting my program to update a textbox which is inside an UpdatePanel. I cannot get this to work.

What I have tried:

Here is my code

ASP.NET

<div class="w3-row-padding  w3-center w3-mobile">            
    <asp:ScriptManager ID="ScriptManager1" runat="server"></asp:ScriptManager>
    <asp:Button ID="cmdSubmit" runat="server" Text="Create Life Budget" CssClass="w3-button w3-black" Font-Bold="False" UseSubmitBehavior="False" />
    <br />
    <br />
    <asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional">
        <ContentTemplate>
            <asp:TextBox ID="txtProgress" runat="server" Text="300" BackColor="Transparent" BorderStyle="None" CssClass="w3-center" ReadOnly="True" Width="300px" AutoPostBack="True"></asp:TextBox>
        </ContentTemplate>
        <Triggers>
            <asp:AsyncPostBackTrigger ControlID="cmdSubmit" EventName="Click" />
        </Triggers>
    </asp:UpdatePanel>
</div>

VB

Protected Sub cmdSubmit_Click(sender As Object, e As EventArgs) Handles cmdSubmit.Click
    Master.HideMsg()
    CreateLifeBudget()
End Sub

Protected Sub CreateLifeBudget()
    '< Other Code>
    txtProgress.Text = "Processing " & iProgress & " of " & iProgressMax
    UpdatePanel1.Update()

    txtProgress.Text = "Processing " &amp; iProgress &amp; " of " &amp;    iProgressMax
    UpdatePanel1.Update()
End Sub

I am getting nothing to appear on the page. As I pasted the code into this question, could it be that since the actual code is inside another subroutine? I event tried it with the sub being Public.

Posted 11-Jul-19 6:35am

Eddi Rae

Updated 17-Aug-20 20:58pm

Add a Solution

Comments

Vincent Maverick Durano 11-Jul-19 15:55pm

If you want to become a "real" web developer, then my advise is to get rid of UpdatePanel and use AJAX instead to do asynchronous updates.

2 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Maciej Los · Answer 1 · 2019-07-11T10:13:00

Solution 1

Sounds like you want to run process in the background...

Take a look here:
How to run Background Tasks in ASP.NET - Scott Hanselman[^]
Background tasks with hosted services in ASP.NET Core | Microsoft Docs[^]

Posted 11-Jul-19 10:13am

Maciej Los

Member 14916780 · Answer 2 · 2020-08-17T20:58:00

Solution 2

TextBoxes are populated little bit differently in updatepanels.

Then they will not update current value unless you focus on the textbox and empty it first. Strange, but it works like that.

This is C#

First set focus and Empty

TextBox1.Focus();
TextBox1.Text = string.Empty;

Then set values to your textbox with Attributes.Add

var value1 = row.Cells[0].Text;
TextBox1.Attributes.Add("value", value1);

This will update your textbox as often as you like in same updatepanel

Posted 17-Aug-20 20:58pm

Member 14916780

Updated 17-Aug-20 20:59pm

v2

Comments

CHill60 18-Aug-20 4:18am

"TextBox1.Text = string.Empty;" is updating the current value of the textbox so what you are saying doesn't really make sense. There is no need to set focus before changing the value. TBH OP was probably not checking isPostBack and the value was getting reset to the original