Was macht die Komponente?

Mit der Stepper-Komponente kann durch einen mehrstufigen Prozess geführt werden. Er zeigt den aktuellen Fortschritt an und ermöglicht es (optional), zwischen den einzelnen Schritten zu navigieren.

Wann soll die Komponente eingesetzt werden?

• Wenn ein Prozess aus mehreren logischen Schritten besteht.
• Wenn bestimmte Schritte in einer festgelegten Reihenfolge durchlaufen werden müssen.
• Wenn eine klare Strukturierung und Führung durch einen Prozess erforderlich ist.

Regeln

• Die Labels der einzelnen Schritte sollen so kurz und aussagekräftig wie möglich sein.
• Falls die Anzahl der Schritte zu gross wird, soll die vertikale Darstellung genutzt werden.

The <sbb-stepper> is a component that visually guides a user through a sequential, multistep process.
It breaks down complex forms, flows, or other linear interactions into smaller, easier-to-follow steps.
The current step is highlighted, and a progress bar connects the steps to visually represent progress.

<sbb-stepper aria-label="Purpose of this flow">
  <sbb-step-label>Step label 1</sbb-step-label>
  <sbb-step>Step content 1</sbb-step>

  <sbb-step-label>Step label 2</sbb-step-label>
  <sbb-step>Step content 2</sbb-step>
</sbb-stepper>

The <sbb-step-label> can be disabled via the disabled attribute/property.

<sbb-step-label disabled>Step label</sbb-step-label>

By default, the <sbb-step-label> displays a counter in the label prefix, which is aligned
with the position in the <sbb-stepper>. This can be overridden via the iconName property.

<!-- Displays a number in the prefix circle -->
<sbb-step-label>Step label</sbb-step-label>

<!-- Displays a tick icon in the prefix circle -->
<sbb-step-label icon-name="tick-small">Step label</sbb-step-label>

Interactions

There are two attributes to support navigation between different steps that can be used on elements inside an sbb-step to select the next or the previous step when clicked: sbb-stepper-next and sbb-stepper-previous.

Linear stepper

The linear property can be set to create a linear stepper that requires the user to complete previous steps before proceeding to following steps.

<sbb-stepper aria-label="Purpose of this flow" linear>
  <sbb-step-label>Step label 1</sbb-step-label>
  <sbb-step>Step content 1</sbb-step>

  <sbb-step-label>Step label 2</sbb-step-label>
  <sbb-step>Step content 2</sbb-step>

  <sbb-step-label>Step label 3</sbb-step-label>
  <sbb-step>Step content 3</sbb-step>
</sbb-stepper>

Events

Whenever a step switch is triggered, a validate event is emitted and can be canceled to prevent the step change.

document
  .querySelector('sbb-stepper')
  .addEventListener((event: CustomEvent<SbbStepValidateEventDetails>) => {
    if (currentStateIsInvalid()) {
      // This will prevent switching to another step and force
      // the user to fix the current state.
      event.preventDefault();
    }
  });

Forms

There are two possible approaches. One is using a single form for the stepper, and the other is using a different form for each step.

Single form

<form>
  <sbb-stepper aria-label="Purpose of this flow">
    <sbb-step-label>Step label 1</sbb-step-label>
    <sbb-step>Step content 1: <sbb-form-field>...</sbb-form-field></sbb-step>

    <sbb-step-label>Step label 2</sbb-step-label>
    <sbb-step>Step content 2: <sbb-form-field>...</sbb-form-field></sbb-step>
  </sbb-stepper>
</form>

Multiple forms

<sbb-stepper aria-label="Purpose of this flow">
  <sbb-step-label>Step label 1</sbb-step-label>
  <sbb-step>
    <form>
      <sbb-form-field>...</sbb-form-field>
    </form>
  </sbb-step>

  <sbb-step-label>Step label 2</sbb-step-label>
  <sbb-step>
    <form>
      <sbb-form-field>...</sbb-form-field>
    </form>
  </sbb-step>
</sbb-stepper>

Calling the reset() method on the <sbb-stepper> will reset the wrapping form or, if they are present, every form in each step; then it will select the first step.

Events

Whenever a step switch is triggered, a validate event is emitted on the requested step and bubbles up to the stepper.
The validate event can be canceled to prevent the step change.
Every successful change of a step triggers the stepchange event.

Accessibility

Whenever textual content is provided, please also set the attribute tabindex=‘0’ on the text tag, so that it can be reached and announced by screen-readers. Also remember to use the classes .sbb-focus-outline and .sbb-focus-outline-dark to correctly style the outline.

<sbb-stepper aria-label="Purpose of this flow">
  <sbb-step-label>Step label 1</sbb-step-label>
  <sbb-step>
    <p tabindex="0" class="sbb-focus-outline">Step content 1</p>
    <sbb-button>Button<sbb-button>
  </sbb-step>

  <sbb-step-label>Step label 2</sbb-step-label>
  <sbb-step>
    <p tabindex="0" class="sbb-focus-outline">Step content 2</p>
    <sbb-button>Button<sbb-button>
  </sbb-step>
</sbb-stepper>

Use an aria-label attribute to describe the purpose of the stepper.
The components internally manage aria states, like aria-setsize, aria-posinset, aria-controls or
aria-labelledby.
If important content needs to be announced when a step is changed, use the aria-live=‘polite’ attribute.

API Documentation

class: SbbStepElement, sbb-step

Properties

Events

Slots

class: SbbStepLabelElement, sbb-step-label

Properties

Methods

Slots

class: SbbStepperElement, sbb-stepper

Properties

Methods

Events

Slots