Challenge with DropDownList Enter Event

Whenever I am using my DropDownList in the UI, it displays data as expected. However, when I attempt to select text from the dropdown by pressing the Enter key, it does not work and move to the next input control like it should.

Selecting text with the Tab key or mouse is working fine. This issue seems to be occurring only in specific areas of my page and project.

I have attempted troubleshooting by removing CSS styles and searching online for a solution, but unfortunately, I have been unable to identify the root cause of the problem or find a definitive answer.

cssasp.net

Answer №1

When your control triggers a postback event with the selectedIndexchange, the next focus element will not be focused due to the postback.

To address this issue, you need to identify the next element and set focus on it within the change event as shown below:

<asp:TextBox ID="txtFirstName" OnTextChanged="txtFirstName_TextChanged" placeholder="" AutoPostBack="true" CssClass="form-control" runat="server"></asp:TextBox>

<asp:TextBox ID="txtLastName" OnTextChanged="txtFirstName_TextChanged" placeholder="" AutoPostBack="true" CssClass="form-control" runat="server"></asp:TextBox>

Code Behind:

protected void txtMEMBID_TextChanged(object sender, EventArgs e)
{
  if(ValidCondition)
  {
    //move to the next element
    txtLastName.Focus();
  }
}

Answer №2

Pressing ENTER triggers the SelectedIndexChanged event for me

<%@ Page Title="Home Page" Language="C#" MasterPageFile="~/Site.Master" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="WebApplication2._Default" %>

<asp:Content ID="BodyContent" ContentPlaceHolderID="MainContent" runat="server">   
    <asp:DropDownList ID="DropDownList1" runat="server" OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged" AutoPostBack="true">
        <asp:ListItem>First</asp:ListItem>
        <asp:ListItem>Second</asp:ListItem>
        <asp:ListItem>Third</asp:ListItem>
    </asp:DropDownList>
    <asp:Button ID="Button1" runat="server" Text="Button" />
</asp:Content>

To make this function properly, it is necessary to include AutoPostback=true

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