Banner

A banner displays a prominent message and related optional actions.

Contents

• Using banners
• Banners
• API
• Usage within web frameworks

Using banners

A banner displays an important, succinct message, and provides actions for users to address (or dismiss the banner). It requires a user action to be dismissed.

Banners should be displayed at the top of the screen, below a top app bar. They’re persistent and nonmodal, allowing the user to either ignore them or interact with them at any time. Only one banner should be shown at a time.

Installing banners

npm install @loipham/material-banner

Styles

@use "@loipham/material-banner/styles";

JavaScript instantiation

import {MDCBanner} from '@loipham/material-banner';
const banner = new MDCBanner(document.querySelector('.mdc-banner'));

See Importing the JS component for more information on how to import JavaScript.

Banners

Banner example

<div class="mdc-banner" role="banner">
  <div class="mdc-banner__content"
       role="alertdialog"
       aria-live="assertive">
    <div class="mdc-banner__graphic-text-wrapper">
      <div class="mdc-banner__text">
        There was a problem processing a transaction on your credit card.
      </div>
    </div>
    <div class="mdc-banner__actions">
      <button type="button" class="mdc-button mdc-banner__primary-action">
        <div class="mdc-button__ripple"></div>
        <div class="mdc-button__label">Fix it</div>
      </button>
    </div>
  </div>
</div>

Variants

Centered

By default, banners are positioned as leading.

They can optionally be displayed centered by adding the mdc-banner--centered modifier class to the root element:

<div class="mdc-banner mdc-banner--centered">
  ...
</div>

Alternatively, you can call the position-centered mixin from Sass:

.my-banner {
  @include banner.position-centered;
}

Fixed banner

When used below top app bars, banners should remain fixed at the top of the screen. This can be done by adding the mdc-banner__fixed wrapper element around the content element:

<div class="mdc-banner" role="banner">
  <div class="mdc-banner__fixed">
    <div class="mdc-banner__content"
         role="alertdialog"
         aria-live="assertive">
      <div class="mdc-banner__graphic-text-wrapper">
        <div class="mdc-banner__text">
          There was a problem processing a transaction on your credit card.
        </div>
      </div>
      <div class="mdc-banner__actions">
        <button type="button" class="mdc-button mdc-banner__primary-action">
          <div class="mdc-button__ripple"></div>
          <div class="mdc-button__label">Fix it</div>
        </button>
      </div>
    </div>
  </div>
</div>

Banner with graphic

Images can help communicate a banner’s message.

<div class="mdc-banner" role="banner">
  <div class="mdc-banner__content"
       role="alertdialog"
       aria-live="assertive">
    <div class="mdc-banner__graphic-text-wrapper">
      <div class="mdc-banner__graphic" role="img" alt=""><i class="material-icons mdc-banner__icon">error_outline</i></div>
      <div class="mdc-banner__text">
        There was a problem processing a transaction on your credit card.
      </div>
    </div>
    <div class="mdc-banner__actions">
      <button type="button" class="mdc-button mdc-banner__primary-action">
        <div class="mdc-button__ripple"></div>
        <div class="mdc-button__label">Fix it</div>
      </button>
    </div>
  </div>
</div>

Banner with two actions

Banners may have one or two low-emphasis text buttons.

<div class="mdc-banner" role="banner">
  <div class="mdc-banner__content"
       role="alertdialog"
       aria-live="assertive">
    <div class="mdc-banner__graphic-text-wrapper">
      <div class="mdc-banner__text">
        There was a problem processing a transaction on your credit card.
      </div>
    </div>
    <div class="mdc-banner__actions">
      <button type="button" class="mdc-button mdc-banner__secondary-action">
        <div class="mdc-button__ripple"></div>
        <div class="mdc-button__label">Learn more</div>
      </button>
      <button type="button" class="mdc-button mdc-banner__primary-action">
        <div class="mdc-button__ripple"></div>
        <div class="mdc-button__label">Fix it</div>
      </button>
    </div>
  </div>
</div>

Mobile stacked

On mobile view, banners with long text should have their action(s) be positioned below the text instead of alongside it. This can be accomplished by adding the mdc-banner--mobile-stacked modifier class to the root element:

<div class="mdc-banner mdc-banner--mobile-stacked">
  ...
</div>

Alternatively, banner can be in stacked layout regardless of mobile-breakpoint, with the layout-stacked mixin from Sass:

.my-banner {
  @include banner-theme.layout-stacked;
}

API

Sass mixins

Access to theme mixins require importing the banner's theme style module.

@use "@loipham/material-banner";

Mixin | Description --- | --- fill-color($color) | Sets the fill color of the banner. text-color($color) | Sets the color of the banners's text. divider-color($color) | Sets the color of the banner's divider. min-width($min-width, $mobile-breakpoint) | Sets the min-width of the banner content on tablet/desktop devices. On mobile, the width is automatically set to 100%. max-width($max-width) | Sets the max-width of the banner content. position-centered() | Sets the banner content to centered instead of leading. z-index($z-index) | Sets the z-index of the banner.

MDCBanner events

Event name | event.detail | Description --- | --- | --- MDCBanner:closing | MDCBannerCloseEventDetail | Indicates when the banner begins its closing animation. MDCBanner:closed | MDCBannerCloseEventDetail | Indicates when the banner finishes its closing animation. MDCBanner:opening | {} | Indicates when the banner begins its opening animation. MDCBanner:opened | {} | Indicates when the banner finishes its opening animation.

MDCBanner properties and methods

Property | Value Type | Description --- | --- | --- isOpen | boolean (read-only) | Returns whether the banner is open.

Method Signature | Description --- | --- open() => void | Opens the banner. close(reason: CloseReason) => void | Closes the banner, with the specified action indicating why it was closed. getText() => string | Gets the text of the banner. setText(text: string) => void | Sets the text of the banner. getPrimaryActionText() => string | Gets the banner's primary action text. setPrimaryActionText(actionButtonText: string) => void | Sets the banner's primary action text. getSecondaryActionText() => string \| null | Gets the banner's secondary action text. Returns null if the banner has no secondary action. setSecondaryActionText(actionButtonText: string) => void | Sets the banner's secondary action text. layout() => void | Recalculates layout. With height being calculated dynamically recommended to call on window resize events.

Usage within frameworks

If you are using a JavaScript framework, such as React or Angular, you can create a banner for your framework. Depending on your needs, you can use the Simple Approach: Wrapping MDC Web Vanilla Components, or the Advanced Approach: Using Foundations and Adapters. Please follow the instructions here.

See MDCBannerAdapter and MDCBannerFoundation for up-to-date code documentation of banner foundation APIs.