Was macht die Komponente?

Ein Dialog ist ein Overlay, das den Hauptinhalt der Seite überlagert und eine fokussierte Interaktion oder wichtige Information präsentiert, bis Nutzende die Aktion abgeschlossen oder den Dialog geschlossen haben.

Wann soll die Komponente eingesetzt werden?

• Um wichtige Informationen oder Bestätigungen an Nutzende zu übermitteln.
• Um Nutzende zu einer Handlung aufzufordern, bevor er mit dem Hauptinhalt der Seite fortfährt.
• Um komplexe Formulare oder Inhalte anzuzeigen, die nicht in die Hauptseite integriert werden sollen.

Regeln

• Ein Dialog soll so weit wie möglich reduziert sein und sich auf eine einzige Aufgabe/Information oder ein einziges Formular konzentrieren.
• Der Dialog soll leicht zu schliessen sein, entweder durch eine Schliessen-Schaltfläche oder durch Klicken ausserhalb des Dialogs.
• Wenn kein Actions im Dialog-Footer definiert werden, müssen Nutzende den Dialog immer schliessen können.
• Dialoge lassen sich auch immer mit der ESC-Taste schliessen.

Spielwiese

The sbb-dialog component provides a way to present content on top of the app's content.
It offers the following features:

• creates a backdrop for disabling interaction below the modal;
• disables scrolling of the page content while open;
• manages focus properly by setting it on the first focusable element;
• can host a sbb-dialog-actions component in the footer;
• has a close button, which is always visible;
• can display a back button next to the title;
• adds the appropriate ARIA roles automatically.

<sbb-dialog>
  <sbb-dialog-title>Title</sbb-dialog-title>
  <sbb-dialog-content>Dialog content.</sbb-dialog-content>
</sbb-dialog>

Slots

There are three slots: title, content and actions, which can respectively be used to provide an sbb-dialog-title, sbb-dialog-content and an sbb-dialog-actions.

<sbb-dialog>
  <sbb-dialog-title>Title</sbb-dialog-title>
  <sbb-dialog-content>Dialog content.</sbb-dialog-content>
  <sbb-dialog-actions>
    <sbb-block-link sbb-dialog-close>Link</sbb-block-link>
    <sbb-secondary-button sbb-dialog-close> Cancel </sbb-secondary-button>
    <sbb-button sbb-dialog-close> Confirm </sbb-button>
  </sbb-dialog-actions>
</sbb-dialog>

Interactions

In order to show the dialog, you need to call the open(event?: PointerEvent) method on the sbb-dialog component.
It is necessary to pass the event object to the open() method to allow the dialog to detect
whether it has been opened by click or keyboard, so that the focus can be better handled.

<sbb-button
  label="Open dialog"
  click="openDialog(event, 'my-dialog')"
  aria-haspopup="dialog"
  aria-controls="my-dialog"
></sbb-button>

<sbb-dialog id="my-dialog">
  <sbb-dialog-title>Title</sbb-dialog-title>
  <sbb-dialog-content>Dialog content.</sbb-dialog-content>
</sbb-dialog>

<script>
  const openDialog = (event, id) => {
    const dialog = document.getElementById(id);
    dialog.open(event);
  };
</script>

To dismiss the dialog, you need to get a reference to the sbb-dialog element and call
the close(result?: any, target?: HTMLElement) method, which will close the dialog element and
emit a close event with an optional result as a payload.

The component can also be dismissed by clicking on the close button, clicking on the backdrop, pressing the Esc key,
or, if an element within the sbb-dialog has the sbb-dialog-close attribute, by clicking on it.

You can also set the property backButton on the sbb-dialog-title component to display the back button in the title section which will emit the event requestBackAction when clicked.

Style

It's possible to display the component in negative variant using the self-named property.

<sbb-dialog negative>
  <sbb-dialog-title>Title</sbb-dialog-title>
  <sbb-dialog-content>Dialog content.</sbb-dialog-content>
</sbb-dialog>

Accessibility

When using a button to trigger the dialog, ensure to manage the appropriate ARIA attributes on the button element itself. This includes: aria-haspopup="dialog" that signals to assistive technologies that the button controls a dialog element,
aria-controls="dialog-id" that connects the button to the dialog by referencing the dialog's ID. Consider using aria-expanded to indicate the dialog's current state (open or closed).

The sbb-dialog component may visually hide the title thanks to the hideOnScroll property of the sbb-dialog-title to create more space for content, this is useful especially on smaller screens. Screen readers and other assistive technologies will still have access to the title information for context.

Properties

Methods

Events

CSS Properties

Slots