Prevent bootstrap modal closing on postback in ASP.NET

Question

I have a bootstrap modal I want to show in order to perform a search and select funcionality in a ASP.NET Web form. The problem is when the user clicks on "Search" button, the modal closes. I want the modal keeps open to show search results on GridView below and closes when the user selects any GridView item.

I've tried other solutions mentioned in other threads but nothing seems to work. I'm using a WebForm with a Master page, I don't know if it can be causin me the issue.

This is my modal code:

<div class="modal fade" id="modSearchByAccount" role="dialog">
<div class="modal-dialog">
    <div class="modal-content">
        <div class="modal-header">
            <button type="button" class="close" data-dismiss="modal">&times;</button>
            <h4 class="modal-title">Search by Account</h4>
        </div>
        <div class="modal-body">
            <div class="row">
                <div class="col-md-8">
                    <asp:TextBox ID="txtSearchText" runat="server" CssClass="form-control" placeholder="Account name"></asp:TextBox>
                </div>
                <div class="col-md-4">
                     <asp:Button ID="btnSearchAccount" runat="server" OnClick="btnSearchAccount_Click" Text="Buscar" CssClass="btn btn-default" />
                </div>    
            </div>
            <div class="row">
                <div class="col-md-12">
                     <asp:Panel ID="pnlSearchResults" runat="server" ScrollBars="Vertical" Height="200px" Width="100%">
                        <asp:GridView ID="gvSearchResults" runat="server" AutoGenerateColumns="False" DataKeyNames="ACCOUNT_ID" OnSelectedIndexChanged="gvSearchResults_SelectedIndexChanged" CssClass="table table-striped table-hover">
                            <Columns>
                                <asp:BoundField DataField="ACCOUNT_ID" HeaderText="ID" />
                                <asp:BoundField DataField="ACCOUNT_NAME" HeaderText="Name" />
                                <asp:CommandField ShowSelectButton ="true" />
                            </Columns>
                        </asp:GridView>
                    </asp:Panel>
                </div>
            </div>
        </div>
        <div class="modal-footer">
            <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
        </div>
    </div> 
 </div>

Any ideas? Can I use an UpdatePanel somewhere here?

Thanks in advance!

Solution 1

Probably too late now, but yes it can be done. The key is to have an outer UpdatePanel and an inner UpdatePanel. The outer panel should be set to an UpdateMode of conditional and ChildrenAsTriggers = true.

In my case I moved the inner body into a User Control, but your code example should work as follows:

<asp:UpdatePanel runat="server" ID="updatePanelTop" UpdateMode="Conditional" ChildrenAsTriggers="True">
<ContentTemplate>
    <div class="modal fade" id="modSearchByAccount" role="dialog">
    <div class="modal-dialog">
        <div class="modal-content">
            <div class="modal-header">
                <button type="button" class="close" data-dismiss="modal">&times;</button>
                <h4 class="modal-title">Search by Account</h4>
            </div>
            <div class="modal-body">
                <asp:UpdatePanel runat="server">
                <ContentTemplate>
                    <div class="row">
                        <div class="col-md-8">
                            <asp:TextBox ID="txtSearchText" runat="server" CssClass="form-control" placeholder="Account name"></asp:TextBox>
                        </div>
                        <div class="col-md-4">
                             <asp:Button ID="btnSearchAccount" runat="server" OnClick="btnSearchAccount_Click" Text="Buscar" CssClass="btn btn-default" />
                        </div>    
                    </div>
                    <div class="row">
                        <div class="col-md-12">
                             <asp:Panel ID="pnlSearchResults" runat="server" ScrollBars="Vertical" Height="200px" Width="100%">
                                <asp:GridView ID="gvSearchResults" runat="server" AutoGenerateColumns="False" DataKeyNames="ACCOUNT_ID" OnSelectedIndexChanged="gvSearchResults_SelectedIndexChanged" CssClass="table table-striped table-hover">
                                    <Columns>
                                        <asp:BoundField DataField="ACCOUNT_ID" HeaderText="ID" />
                                        <asp:BoundField DataField="ACCOUNT_NAME" HeaderText="Name" />
                                        <asp:CommandField ShowSelectButton ="true" />
                                    </Columns>
                                </asp:GridView>
                            </asp:Panel>
                        </div>
                    </div>
                </ContentTemplate>
                </asp:UpdatePanel>
            </div>
            <div class="modal-footer">
                <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
            </div>
        </div> 
     </div>
</ContentTemplate>
</asp:UpdatePanel>     

Solution 2

If you are using the UpdatePanel with Select2List or Some other bootstrap like FileUpload Controls, they will not properly render on Auto Post Back

To avoid this don't use the Update Panel just add the following code in code behind. This code will keep your Bootstrap Popup open after AutoPostBack Event.

protected void OnSelectedIndexChanged(object sender, EventArgs e)
{
    ClientScript.RegisterStartupScript(this.GetType(), "Popup", "$('#MyPopup').modal('show')", true);
}