Dropdownlist SelectedIndexChanged event not Firing

Question

User-712926555 posted

Hi 

<%@ Page Title="" Language="C#" MasterPageFile="~/Site.Master" AutoEventWireup="true" EnableViewState="true"
    CodeBehind="SPUReceive.aspx.cs" Inherits="POS.Portal.Purchase.SPUReceive" %>

    <asp:DropDownList ID="ddlSPUNo" runat="server" AutoPostBack="true" OnSelectedIndexChanged="ddlSPUNo_Change">
    </asp:DropDownList>

protected void Page_Load(object sender, EventArgs e)
        {
            if (!Page.IsPostBack)
            {
                Bindings.BindSPUNo(ddlSPUNo);
            }
        }
protected void ddlSPUNo_Change(object sender, EventArgs e)
       {

       }

Page gets Loaded but Dropdownlist SelectedIndexChanged event not Fired

Answer 1

User724169276 posted

From the codes you shared , i feel there is nothing wrong there , can you check if any javascript function is associated with that control which is restricting the postback,morover do check for developer tools console for possible client side defects.

Answer 2

User2103319870 posted

By any chance if you dropdownlist is inside of an updatepanel then ensure that you have set the trigger in update panel like below

 <asp:UpdatePanel ID="up1" runat="server" UpdateMode="conditional">
            <Triggers>
                <asp:AsyncPostBackTrigger ControlID="ddlSPUNo" EventName="SelectedIndexChanged" />
            </Triggers>
            <ContentTemplate>
                <asp:DropDownList ID="ddlSPUNo" runat="server" AutoPostBack="true" OnSelectedIndexChanged="ddlSPUNo_Change">
                </asp:DropDownList>
            </ContentTemplate>
        </asp:UpdatePanel>

Answer 3

User332523570 posted

Hi,

Your code looks OK. It must work.

How many value are present in drop dowm?

Answer 4

User-712926555 posted

Hi

I made  a mistake binding data

Bindings.BindSPUNo(ddlSPUNo);

 ListItem value = "0" for all Item.