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 mainly to
interact with the user.

The component creates a backdrop to prevent interaction with content behind the modal, disables page
scrolling while open, manages focus by setting it to the first focusable element, and automatically
adds the appropriate ARIA roles.

The dialog should always consist of a title and content. Optionally, a close button and actions can
be provided.

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

The component supports slotting the <sbb-dialog-title>, <sbb-dialog-close-button>, <sbb-dialog-content>
and an <sbb-dialog-actions> elements for structuring the content of a dialog.

<sbb-dialog>
  <sbb-dialog-title>Title</sbb-dialog-title>
  <sbb-dialog-close-button></sbb-dialog-close-button>
  <sbb-dialog-content>Dialog content.</sbb-dialog-content>
  <sbb-dialog-actions>
    <sbb-secondary-button sbb-dialog-close>Cancel</sbb-secondary-button>
    <sbb-button sbb-dialog-close sbb-focus-initial>Confirm</sbb-button>
  </sbb-dialog-actions>
</sbb-dialog>

Title.

The <sbb-dialog-title> component extends the sbb-title component.
It should be used as a title for a dialog.

<sbb-dialog>
  <sbb-dialog-title>A describing title of the dialog</sbb-dialog-title>
</sbb-dialog>

States.

The title can have a negative state which is automatically synchronized with the negative state of the dialog.

Style.

In scenarios where the visual representation needs to be different from the semantic meaning of the title level,
it is possible to use the visualLevel property (default value: 4).

Actions.

The <sbb-dialog-actions> component extends the sbb-action-group
component. Use it to display a footer with an action group.

<sbb-dialog>
  <sbb-dialog-actions
    class="sbb-orientation-vertical-full-width sbb-orientation-horizontal-from-small"
  >
    <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 sbb-focus-initial>Confirm</sbb-button>
  </sbb-dialog-actions>
</sbb-dialog>

Interactions.

To display the dialog, a trigger can be connected via the trigger property,
or the open() method on the <sbb-dialog> component can be called.

<sbb-button id="dialog-trigger">Open dialog</sbb-button>

<sbb-dialog trigger="dialog-trigger">
  <sbb-dialog-title>Title</sbb-dialog-title>
  <sbb-dialog-content>Dialog content.</sbb-dialog-content>
  <sbb-dialog-actions><sbb-button sbb-dialog-close>Close</sbb-button></sbb-dialog-actions>
</sbb-dialog>

Closing the dialog.

The dialog can be closed in several ways:

1. Close button: Add an <sbb-dialog-close-button> component to provide a dedicated close button.
   This is recommended for dialogs with complex content.

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

   The <sbb-dialog-close-button> component extends the
   sbb-secondary-button component.
   An aria-label is automatically set. It is however possible to override it, if necessary.

2. sbb-dialog-close attribute: Add the sbb-dialog-close attribute to any element within the dialog
   (typically buttons in the actions section) to close the dialog when clicked. You can optionally provide a result value:

   <sbb-dialog>
     <sbb-dialog-title>Title</sbb-dialog-title>
     <sbb-dialog-content>Dialog content.</sbb-dialog-content>
     <sbb-dialog-actions>
       <sbb-secondary-button sbb-dialog-close="cancel">Cancel</sbb-secondary-button>
       <sbb-button sbb-dialog-close="confirm">Confirm</sbb-button>
     </sbb-dialog-actions>
   </sbb-dialog>
   

   Alternatively, you can use the assignDialogResult() helper to programmatically assign a complex result to an element:

   import { assignDialogResult } from '@sbb-esta/lyne-elements/dialog.js';
   
   const confirmButton = document.querySelector('sbb-button');
   assignDialogResult(confirmButton, { action: 'confirm', otherProp: 'any value' });
   

3. Backdrop click: By default, clicking on the backdrop will close the dialog.
   This behavior can be disabled by setting backdrop-action="none".

4. Escape key: Pressing the Esc key will close the dialog.

5. Programmatically: Call the close(result?: any) method on the <sbb-dialog> element.
   This method closes the dialog and emits beforeclose and close events with the provided result as a payload.

   const dialog = document.querySelector('sbb-dialog');
   dialog.close({ confirmed: true });
   

Handling close events.

When the dialog closes, it emits two events:

• beforeclose: Emitted before the closing transition begins. This event is cancelable by calling event.preventDefault().
• close: Emitted after the dialog has fully closed.

Both events are of type SbbDialogCloseEvent and provide access to:

• result: The result value passed to close(), assigned via assignDialogResult(),
  or the value of the sbb-dialog-close attribute. This is null if the dialog
  was closed via backdrop click or Escape key.
• closeTarget: The element that triggered the close action (e.g., the clicked button),
  or null if closed programmatically or via Escape key

dialog.addEventListener('close', (event) => {
  console.log('Result:', event.result);
  console.log('Close target:', event.closeTarget);
});

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>

The dialog takes the full width and adapts its height to the slotted content;
starting from small breakpoint, the width adapts to the content too.

To configure the dialog dimension, consumers can set the dimensions on the slotted content,
e.g. setting the width or height on the <sbb-dialog-content> element.

<style>
  sbb-dialog-content {
    height: 480px;
  }
</style>
<sbb-dialog>
  <sbb-dialog-title>Title</sbb-dialog-title>
  <sbb-dialog-content>Dialog content.</sbb-dialog-content>
</sbb-dialog>

Accessibility.

We recommend to place at maximum two actions in the <sbb-dialog-actions> component.
More elements can potentially confuse users.

If there is more complex content than just a simple text / question, we recommend to slot the <sbb-dialog-close-button>.
This either provides an initial focus at the dialog start and also provides as a second exit possibility.

Controlling initial focus.

The first element with the attribute sbb-focus-initial will receive focus on opening.
If the attribute is not used, the first focusable element receives focus.
In case there is no <sbb-dialog-close-button> and complex content,
there should be a focusable element at the dialog start, e.g. the title itself.
This prevents screen reader users having to navigate backwards from the dialog actions.

Focus restoration.

When closed, the dialog restores focus to the element that previously held focus when the
dialog opened by default. However, focus restoration can be disabled
by setting the skipFocusRestoration property to true.
As this is an accessibility feature, it is recommended to focus
an alternative element by listening to the didClose event.

API Documentation.

class: SbbDialogActionsElement, sbb-dialog-actions.

Slots.

class: SbbDialogCloseButtonElement, sbb-dialog-close-button.

Properties.

Methods.

CSS Properties.

Slots.

class: SbbDialogContentElement, sbb-dialog-content.

Slots.

class: SbbDialogElement, sbb-dialog.

Properties.

Methods.

Events.

CSS Properties.

Slots.

class: SbbDialogTitleElement, sbb-dialog-title.

Properties.

Slots.