All I am using Bootstrap Toast to display alert messages. But the issue I am getting is to hide them automatically.
I tried with and without data-bs-autohide="true" data-bs-delay="3000" but no success.
The tricky part is I am creating this toast in Code behind and appending it to the aspx page control.
I tried static code in HTML, but it still did not work.
I believe it's due to asp:UpdatePanel
Here is my code.
How can I make it auto hide?
page.aspx
<asp:Content ID="Content1" ContentPlaceHolderID="MainContent" runat="server">
<div class="container body-content pt-3 mb-3">
<asp:UpdatePanel ID="UpdatePanel4" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<div class="col-md-12">
<div runat="server" id="alertParent" class="toast-container position-fixed top-0 end-0 p-3">
</div>
<asp:Button ID="Button1" CssClass="btn btn-primary" CausesValidation="false" OnClick="Button1_Click" runat="server" Text="Show" />
</div>
</ContentTemplate>
</asp:UpdatePanel>
</div>
</asp:Content>
page.aspx.cs
protected void ShowAlertMessage(string tstr, string Header = "")
{
try
{
//Header = string.IsNullOrEmpty(Header) ? "Error" : Header;
alertParent.Visible = true;
alertParent.Style.Add("z-index", "3");
var div = new HtmlGenericControl("div");
div.Attributes["role"] = "alert";
div.Attributes["aria-live"] = "assertive";
div.Attributes["aria-atomic"] = "true";
div.Attributes["data-bs-autohide"] = "true";
div.Attributes["data-bs-delay"] = "3000";
var Child_div = new HtmlGenericControl("div");
Child_div.Attributes["class"] = "toast-header";
var Sub_Child_1 = new HtmlGenericControl("strong");
Sub_Child_1.Attributes["class"] = "me-auto";
Sub_Child_1.InnerHtml = Header;
var Sub_Child_2 = new HtmlGenericControl("span");
//Sub_Child_2.Attributes["type"] = "button";
Sub_Child_2.Attributes["class"] = "btn-close";
Sub_Child_2.Attributes["data-bs-dismiss"] = "toast";
Sub_Child_2.Attributes["aria-label"] = "Close";
Child_div.Controls.Add(Sub_Child_1);
Child_div.Controls.Add(Sub_Child_2);
var Child_div_2 = new HtmlGenericControl("div");
Child_div_2.Attributes["class"] = "toast-body";
div.Controls.Add(Child_div);
div.Controls.Add(Child_div_2);
string sFlag, smessage;
if (tstr.Length == 0)
return;
string[] words = tstr.Split('_');
sFlag = words[0];
smessage = words[1];
switch (sFlag)
{
case "warning":
{
div.Attributes["class"] = "toast fade text-bg-warning";
Child_div_2.InnerHtml = smessage;
break;
}
case "danger":
{// REM error
div.Attributes["class"] = "toast fade text-bg-danger";
Child_div_2.InnerHtml = smessage;
break;
}
case "success":
{// REM error
div.Attributes["class"] = "toast fade text-bg-success";
Child_div_2.InnerHtml = smessage;
break;
}
case "primary":
{// REM error
div.Attributes["class"] = "toast fade text-bg-primary";
Child_div_2.InnerHtml = smessage;
break;
}
case "info":
{// REM error
div.Attributes["class"] = "toast fade text-bg-info";
Child_div_2.InnerHtml = smessage;
break;
}
default:
{
div.Attributes["class"] = "toast fade hide text-bg-info";
Child_div_2.InnerHtml = "";
alertParent.Visible = false;
alertParent.Style.Add("z-index", "-1");
break;
}
}
alertParent.Controls.Add(div);
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
}
protected void Button1_Click(object sender, EventArgs e)
{
ShowAlertMessage("success_My Message is here.");
}
Bootstrap Toasts must first be initialized
As noted in the Bootstrap 5 documentation, "Toasts are opt-in for performance reasons, so you must initialize them yourself."
To initialize the new Toast from the ASPX C# code behind we can add an ID and use ScriptManager to call Bootstrap methods. We need to both initialized the Toast and show it for the autohide to work.
C# Code
Complete Demo
The demo has been tested in Visual Studio. Clicking the button creates a new Toast component as in the original. However, it then uses ScriptManager to initialize and show the Toast. The Toast displays for 3 seconds and then automatically hides.