Cannot put the text in input box in asp.net

Question

I am trying to make the input box show some text in the asp.net using c#, but after I run the code behind, nothing is displayed in the input box. The ui is RadNumericTextBox uiDistance. In class, I put this.uiDistance.Text = "123"; But in the webpage after run the code. I cannot see "123" is put in the uiDistance text box. How can I fix it?

Here is my aspx UsageControl2SubControl1.ascx

<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="UsageControl2SubControl1.ascx.cs" Inherits="WebControls.UsageControl2SubControl1" %>
<asp:HiddenField ID="uiRemoved" Value="false" runat="server" />
<asp:HiddenField ID="uiID" runat="server" />
<div class="form-group">    

    <div class="col-md-2 customColumnPadding">
        <asp:UpdatePanel ID="UpdatePanel1" runat="server">
            <ContentTemplate>
                <telerik:RadTextBox ID="uiToLocation" runat="server" Width="100%" AutoPostBack="true"
                    OnTextChanged="uiToLocation_Leave" EmptyMessage="<%$ Resources:ResourceHKEx,Arrive_To %>" />
            </ContentTemplate>
        </asp:UpdatePanel>

    </div>

    <div class="col-md-2 customColumnPadding" id="uiColumnDistance" runat="server">
        <telerik:RadNumericTextBox ID="uiDistance" runat="server" Width="100%" MinValue="0" NumberFormat-DecimalDigits="2" EmptyMessage="<%$ Resources:Resource,Distance %>" />
    </div>

</div>
<div class="hr-line-dashed"></div>

And Here is my code behind: UsageControl2SubControl1.ascx.cs

using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using Telerik.Web.UI;

namespace WebControls
{
    public partial class UsageControl2SubControl1 : System.Web.UI.UserControl
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            if (Convert.ToBoolean(uiRemoved.Value))
            {
                this.Visible = false;
            }
        }

        protected void uiAdd_Click(object sender, Telerik.Web.UI.ImageButtonClickEventArgs e)
        {

        }

        protected void uiRemove_Click(object sender, Telerik.Web.UI.ImageButtonClickEventArgs e)
        {

        }

        protected void RadComboBoxProduct_ItemsRequested(object sender, RadComboBoxItemsRequestedEventArgs e)
        {

        }

        protected void uiAdd_Click1(object sender, ImageClickEventArgs e)
        {


        }

        protected void uiRemove_Click1(object sender, ImageClickEventArgs e)
        {

        }

        protected void uiToLocation_Leave(object sender, EventArgs e)
        {


            this.uiDistance.Text = "123";

        }
    }// end class
}// end namespace

it triggering when you write something in this field. Do you know it? — evilGenius
– evilGenius, Commented May 7, 2019 at 6:23
Sorry, I am not so sure. Can you explain a little bit? How can I solve the issue? — want_to_be_calm
– want_to_be_calm, Commented May 7, 2019 at 6:24
have you put break point on uiToLocation_Leave event to see does that event triggers? — Kevin Shah
– Kevin Shah, Commented May 7, 2019 at 6:25
@want_to_be_calm yes, say me when it have to fired and i will write to you code — evilGenius
– evilGenius, Commented May 7, 2019 at 6:27
@KevinShah , Yes, I put the breakpoint in it and it does run. — want_to_be_calm
– want_to_be_calm, Commented May 7, 2019 at 6:28

Kevin Shah · Accepted Answer · 2019-05-07 06:36:53Z

Just to update your aspx code little bit

<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>

<div class="form-group">
    <div class="col-md-2 customColumnPadding">           
         <telerik:RadTextBox ID="uiToLocation" runat="server" Width="100%" AutoPostBack="true"
                    OnTextChanged="uiToLocation_Leave" EmptyMessage="<%$ Resources:ResourceHKEx,Arrive_To %>" />
    </div>

    <div class="col-md-2 customColumnPadding" id="uiColumnDistance" runat="server">
        <telerik:RadNumericTextBox ID="uiDistance" runat="server" Width="100%" MinValue="0" NumberFormat-DecimalDigits="2" EmptyMessage="<%$ Resources:Resource,Distance %>" />
    </div>

</div>
  </ContentTemplate>
        </asp:UpdatePanel>

As your textbox is only inside the update panel so, on post back only that portion is partially updated, you need to put RadNumericTextBox inside the update panel too.

Hope this will work.

Jon P · Accepted Answer · 2019-05-07 06:46:17Z

0

You are using the wrong property. Use Value not Text

protected void uiToLocation_Leave(object sender, EventArgs e)
{
   this.uiDistance.Value = "123";
}

As always, check the documentation. See: https://docs.telerik.com/devtools/aspnet-ajax/controls/numerictextbox/features/getting-and-setting-values

answered May 7, 2019 at 6:46

Jon P

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Comments

Harshad Vekariya · Accepted Answer · 2019-05-07 06:56:34Z

0

Your current code will works only when you tab out from uiToLocation textbox.

If you want to show it when page loads, just move your code in to Page_Load event instead uiToLocation_Leave.

        protected void Page_Load(object sender, EventArgs e)
        {
            if (Convert.ToBoolean(uiRemoved.Value))
            {
                this.Visible = false;
            }
            this.uiDistance.Text = "123"; // it will assign when page loads.
        }

If you want to load it only once when page loads, use IsPostaback, see below.

        protected void Page_Load(object sender, EventArgs e)
        {
            if (Convert.ToBoolean(uiRemoved.Value))
            {
                this.Visible = false;
            }

            if (!IsPostBack)
            {
                this.uiDistance.Text = "123"; // it will assign only once when page loads.
            }
        }

edited May 7, 2019 at 6:56

answered May 7, 2019 at 6:29

Harshad Vekariya

1,0621 gold badge9 silver badges28 bronze badges

2 Comments

want_to_be_calm Over a year ago

What I need is I want uiDistance to be updated when I type something in uiToLocation, and I find it after I type in uiToLocation, it does go to uiToLocation_Leave and run this.uiDistance.text = "123", however, I see in the webpage, nothing is changed.

Harshad Vekariya Over a year ago

If this is what you want, follow @Kevin Shah's answer. Move your textbox inside update panel.

Learning · Accepted Answer · 2019-05-07 07:01:49Z

0

IT seems you are using the wrong property to assign value to telerik Textbox.

Use .Value property as .Text property if for default aspx Textbox control

this.uiDistance.Value= "123"

answered May 7, 2019 at 7:01

Learning

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1 Comment

Jon P Over a year ago

Please avoid posting duplicate answers. Please see my answer posted 15min before yours

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