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Custom or Centered Notification Position

Environment

Product Notification for Blazor

Description

I want to customize the position of the notification to be different from the default options that are relative to the viewport boundaries. I want the notifications in a page area I choose.

I'd like to vertically center the notifications and display them at the center of the screen.

I would like to adjust the notification, so it is displayed below the top menu.

Solution

To display notifications at a custom position, follow these steps. The examples below demonstrate them in action.

  • Place the TelerikNotification component in two nested <div> elements.
    • The outer <div> should have a position:relative style.
    • The inner <div> should have a position:absolute style.
    • The absolute positioning ensures that the notifications don't push other content on the page. In some cases the outer <div> may not be needed.
  • Adjust the position of one or both <div>s. The exact approach and CSS styles will depend on the specific case.
  • Set a Class to the TelerikNotification component, which applies position:relative and flex-wrap: nowrap !important CSS styles.

Custom Notifications near the center-top of the page

Here is where the notifications will appear if the outer relative <div> is placed right below the top bar of a Blazor app.

Custom positions of the notifications that respect their parent element

Custom notification position through a wrapping element

@* Use parent elements and CSS to set the custom position of the notifications *@

<style>
    .custom-notification-parent {
        position: absolute; /* lets the notifications use this parent for positioning */
        left: 50%;
        top: 50%;
        transform: translate(-50%, -50%);
        z-index: 1234; /* depends on other z-indexes on the page */
        /* This example centers the notification container according to its own parent which is
        below the button.
        Centering approach based on https://css-tricks.com/centering-css-complete-guide/
        */
    }

    .custom-positioned-notifications {
        position: relative; /* force the individual notifications respect the position of their parent */
        flex-wrap: nowrap !important; /* display the individual notifications in a single column */
    }
</style>

<TelerikButton OnClick="@AddNotification">Add a notification that will be positioned according to its parent element</TelerikButton>

<div style="position: relative">
    <div class="custom-notification-parent">
        <TelerikNotification Class="custom-positioned-notifications"
                             @ref="@NotificationReference"
                             HorizontalPosition="@NotificationHorizontalPosition.Center"
                             VerticalPosition="@NotificationVerticalPosition.Top">
        </TelerikNotification>
    </div>
</div>

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@code {
    TelerikNotification NotificationReference { get; set; }
    int counter { get; set; }
    public void AddNotification()
    {
        NotificationReference.Show(new NotificationModel()
        {
            Text = $"Notification {counter++}",
            ThemeColor = "primary",
            Closable = true,
            CloseAfter = 0
        });
    }
}

Center Notifications Vertically and Horizontally on the Screen

In this case, the TelerikNotification is wrapped in a single <div> with a position:fixed style. This will center the notifications on the screen, no matter the page scroll offset.

<style>
    .centered-notification-parent {
        /* center this element on the screen, no matter the page scroll offset */
        position: fixed;
        left: 50%;
        top: 50%;
        transform: translate(-50%, -50%);
        z-index: 1234; /* depends on other z-indexes on the page */
    }

    .custom-positioned-notifications {
        position: relative; /* force the individual notifications respect the position of their parent */
        flex-wrap: nowrap !important; /* display the individual notifications in a single column */
    }
</style>

<TelerikButton OnClick="@AddNotification">Display a vertically centered notification</TelerikButton>

<div class="custom-notification-parent">
    <TelerikNotification Class="custom-positioned-notifications"
                         @ref="@NotificationReference"
                         HorizontalPosition="@NotificationHorizontalPosition.Center"
                         VerticalPosition="@NotificationVerticalPosition.Top">
    </TelerikNotification>
</div>

@code {
    TelerikNotification NotificationReference { get; set; }
    int counter { get; set; }
    public void AddNotification()
    {
        var notificationText = counter % 5 == 0 ? "A Lot Longer Notification Content Here" : "Foo";
        NotificationReference.Show(new NotificationModel()
        {
            Text = $"{notificationText} {++counter}",
            ThemeColor = "primary",
            Closable = true,
            CloseAfter = 0
        });
    }
}

Notes

  • Keep in mind that the container for the notifications might consume mouse clicks, selection or otherwise interfere with the UX of your app. Thus, style and size it accordingly.

  • You can inspect the rendered content to see what the built-in CSS rules and HTML structure are, so you can tweak this example further to fit your needs.

  • You can declare a single notification instance in the main layout of your app and pass it down to all components in the app so they can all show notifications if they need to. You can find an example implementation in the One Notification Instance for All Components sample project.

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