Expansion panel

Expansion panels organize content into collapsible panels and reveal them to users in a progressive, step-by-step way.

Examples

Base

Group expansion panels using the attribute data-chi-epanel-group="name-of-the-group". This will enable panels to work together as a sequential form. When a panel is activated, the previous expanding panels will get the done state and the next will get the pending state.

Optional subtitle

Content in expansion panel (e.g. a form to select a product package)

Optional subtitle

Content in expansion panel (e.g. a form to enter shipping address)

Optional subtitle

Content in expansion panel (e.g. a form to select installation date)

Optional subtitle

Content in expansion panel (e.g. a form to enter payment method)

Web Component
HTML Blueprint

<chi-expansion-panel step="1" title="Panel title" state="active">
  <div slot="active">
    <div class="chi-epanel__subtitle">
      Optional subtitle
    </div>
    <p class="chi-epanel__text">
      Content in expansion panel (e.g. a form to select a product package)
    </p>
  </div>
  <div slot="footer">
    <chi-button color="primary">
      Continue
    </chi-button>
  </div>
</chi-expansion-panel>
<chi-expansion-panel step="2" title="Panel title"></chi-expansion-panel>
<chi-expansion-panel step="3" title="Panel title"></chi-expansion-panel>
<chi-expansion-panel step="4" title="Panel title"></chi-expansion-panel>

This HTML Blueprint requires JavaScript. You may use your own solution, or use Chi's vanilla JavaScript solution, Chi.js.

<!-- JavaScript -->
<script>chi.expansionPanel(document.querySelectorAll('[data-chi-epanel-group="example__base"]'));</script>

<!-- HTML -->
<div class="chi-epanel -active" data-chi-epanel-group="example__base">
  <div class="chi-epanel__header">
    <div class="chi-epanel__number">1.</div>
    <div class="chi-epanel__title">Panel title</div>
    <div class="chi-epanel__content">
      <div class="chi-epanel__collapse">
        <div class="-done--only">
          Use this area to present
          a read-only summary of what the user
          entered or selected in step 1.
          (e.g.) a package selection
        </div>
      </div>
    </div>
    <div class="chi-epanel__action -done--only">
      <button class="chi-button -primary -flat" data-chi-epanel-action="active">Change</button>
    </div>
  </div>
  <div class="chi-epanel__collapse">
    <div class="-active--only">
      <div class="chi-epanel__body">
        <div class="chi-epanel__content">
          <div class="chi-epanel__subtitle">Optional subtitle</div>
          <p class="chi-epanel__text">Content in expansion panel (e.g. a form to select a product package)</p>
        </div>
        <div class="chi-epanel__footer -justify-content--end">
          <button class="chi-button -primary" data-chi-epanel-action="next">Continue</button>
        </div>
      </div>
    </div>
  </div>
</div>
<div class="chi-epanel" data-chi-epanel-group="example__base">
  <div class="chi-epanel__header">
    <div class="chi-epanel__number">2.</div>
    <div class="chi-epanel__title">Panel title</div>
    <div class="chi-epanel__content">
      <div class="chi-epanel__collapse">
        <div class="-done--only">
          Use this area to present
          a read-only summary of what the user
          entered or selected in step 2.
          (e.g.) shipping address
        </div>
      </div>
    </div>
    <div class="chi-epanel__action -done--only">
      <button class="chi-button -primary -flat" data-chi-epanel-action="active">Change</button>
    </div>
  </div>
  <div class="chi-epanel__collapse">
    <div class="-active--only">
      <div class="chi-epanel__body">
        <div class="chi-epanel__content">
          <div class="chi-epanel__subtitle">Optional subtitle</div>
          <p class="chi-epanel__text">Content in expansion panel (e.g. a form to enter shipping address)</p>
        </div>
        <div class="chi-epanel__footer -justify-content--end">
          <button class="chi-button" data-chi-epanel-action="previous">Previous</button>
          <button class="chi-button -primary" data-chi-epanel-action="next">Continue</button>
        </div>
      </div>
    </div>
  </div>
</div>
<div class="chi-epanel" data-chi-epanel-group="example__base">
  <div class="chi-epanel__header">
    <div class="chi-epanel__number">3.</div>
    <div class="chi-epanel__title">Panel title</div>
    <div class="chi-epanel__content">
      <div class="chi-epanel__collapse">
        <div class="-done--only">
          Use this area to present
          a read-only summary of what the user
          entered or selected in step 3.
          (e.g.) installation date
        </div>
      </div>
    </div>
    <div class="chi-epanel__action -done--only">
      <button class="chi-button -primary -flat" data-chi-epanel-action="active">Change</button>
    </div>
  </div>
  <div class="chi-epanel__collapse">
    <div class="-active--only">
      <div class="chi-epanel__body">
        <div class="chi-epanel__content">
          <div class="chi-epanel__subtitle">Optional subtitle</div>
          <p class="chi-epanel__text">Content in expansion panel (e.g. a form to select installation date)</p>
        </div>
        <div class="chi-epanel__footer -justify-content--end">
          <button class="chi-button" data-chi-epanel-action="previous">Previous</button>
          <button class="chi-button -primary" data-chi-epanel-action="next">Continue</button>
        </div>
      </div>
    </div>
  </div>
</div>
<div class="chi-epanel" data-chi-epanel-group="example__base">
  <div class="chi-epanel__header">
    <div class="chi-epanel__number">4.</div>
    <div class="chi-epanel__title">Panel title</div>
    <div class="chi-epanel__content">
      <div class="chi-epanel__collapse">
        <div class="-done--only">
          Use this area to present
          a read-only summary of what the user
          entered or selected in step 4.
          (e.g.) payment method
        </div>
      </div>
    </div>
    <div class="chi-epanel__action -done--only">
      <button class="chi-button -primary -flat" data-chi-epanel-action="active">Change</button>
    </div>
  </div>
  <div class="chi-epanel__collapse">
    <div class="-active--only">
      <div class="chi-epanel__body">
        <div class="chi-epanel__content">
          <div class="chi-epanel__subtitle">Optional subtitle</div>
          <p class="chi-epanel__text">Content in expansion panel (e.g. a form to enter payment method)</p>
        </div>
        <div class="chi-epanel__footer -justify-content--end">
          <button class="chi-button" data-chi-epanel-action="previous">Previous</button>
          <button class="chi-button -primary" data-chi-epanel-action="done">Finish</button>
        </div>
      </div>
    </div>
  </div>
</div>

States

Expansion panels have four states: active, pending, done and disabled. When pending (default state), only the title is shown. When active, panels expand to show content or forms. When done, content or form data is presented in a read only state. When disabled, a muted title is shown in a non-clickable state.

The four examples below differ only by state. Thanks to the state support and two internal hiding utility classes we can represent the different states of the same content changing only the property.

An optional cancel button can also be included to exit the expansion panel workflow.

Optional subtitle

Content in expansion panel (e.g. a form to select a product package)

Optional subtitle

Content in expansion panel (e.g. a form to enter shipping address)

Optional subtitle

Content in expansion panel (e.g. a form to select installation date)

Optional subtitle

Content in expansion panel (e.g. a form to enter payment method)

Web Component
HTML Blueprint

<!-- Done state -->
<chi-expansion-panel step="1" title="Done panel" state="done">
  <div slot="done">
    Use this area to present
    a read-only summary of what the user
    entered or selected in step 1.
    (e.g.) a package selection
  </div>
  <div slot="change">
    <chi-button color="primary" variant="flat">
      Change
    </chi-button>
  </div>
</chi-expansion-panel>
<!-- Active state -->
<chi-expansion-panel step="2" title="Active panel" state="active">
  <div slot="active">
    <div class="chi-epanel__subtitle">
      Optional subtitle
    </div>
    <p class="chi-epanel__text">
      Content in expansion panel (e.g. a form to enter shipping address)
    </p>
  </div>
  <div slot="footer">
    <chi-button color="primary" variant="flat">
      Cancel
    </chi-button>
    <chi-button color="primary" variant="outline">
      Previous
    </chi-button>
    <chi-button color="primary">
      Continue
    </chi-button>
  </div>
</chi-expansion-panel>
<!-- Pending state -->
<chi-expansion-panel step="3" title="Pending panel"></chi-expansion-panel>
<!-- Disabled state -->
<chi-expansion-panel step="4" title="Disabled panel" state="disabled"></chi-expansion-panel>

This HTML Blueprint requires JavaScript. You may use your own solution, or use Chi's vanilla JavaScript solution, Chi.js.

<!-- JavaScript -->
<script>chi.expansionPanel(document.querySelectorAll('[data-chi-epanel-group="example__state"]'));</script>

<!-- HTML -->
<!-- Done state -->
<div class="chi-epanel -done" data-chi-epanel-group="example__state">
  <div class="chi-epanel__header">
    <div class="chi-epanel__number">1.</div>
    <div class="chi-epanel__title">Done state</div>
    <div class="chi-epanel__content">
      <div class="chi-epanel__collapse">
        <div class="-done--only">
          Use this area to present
          a read-only summary of what the user
          entered or selected in step 1.
          (e.g.) a package selection
        </div>
      </div>
    </div>
    <div class="chi-epanel__action -done--only">
      <button class="chi-button -primary -flat" data-chi-epanel-action="active">Change</button>
    </div>
  </div>
  <div class="chi-epanel__collapse">
    <div class="-active--only">
      <div class="chi-epanel__body">
        <div class="chi-epanel__content">
          <div class="chi-epanel__subtitle">Optional subtitle</div>
          <p class="chi-epanel__text">Content in expansion panel (e.g. a form to select a product package)</p>
        </div>
        <div class="chi-epanel__footer -justify-content--end">
          <button class="chi-button -primary" data-chi-epanel-action="next">Continue</button>
        </div>
      </div>
    </div>
  </div>
</div>
<!-- Active state -->
<div class="chi-epanel -active" data-chi-epanel-group="example__state">
  <div class="chi-epanel__header">
    <div class="chi-epanel__number">2.</div>
    <div class="chi-epanel__title">Active state</div>
    <div class="chi-epanel__content">
      <div class="chi-epanel__collapse">
        <div class="-done--only">
          Use this area to present
          a read-only summary of what the user
          entered or selected in step 2.
          (e.g.) shipping address
        </div>
      </div>
    </div>
    <div class="chi-epanel__action -done--only">
      <button class="chi-button -primary -flat" data-chi-epanel-action="active">Change</button>
    </div>
  </div>
  <div class="chi-epanel__collapse">
    <div class="-active--only">
      <div class="chi-epanel__body">
        <div class="chi-epanel__content">
          <div class="chi-epanel__subtitle">Optional subtitle</div>
          <p class="chi-epanel__text">Content in expansion panel (e.g. a form to enter shipping address)</p>
        </div>
        <div class="chi-epanel__footer -justify-content--end">
          <button class="chi-button -flat -primary">Cancel</button>
          <button class="chi-button" data-chi-epanel-action="previous">Previous</button>
          <button class="chi-button -primary" data-chi-epanel-action="next">Continue</button>
        </div>
      </div>
    </div>
  </div>
</div>
<!-- Pending state -->
<div class="chi-epanel -pending" data-chi-epanel-group="example__state">
  <div class="chi-epanel__header">
    <div class="chi-epanel__number">3.</div>
    <div class="chi-epanel__title">Pending state</div>
    <div class="chi-epanel__content">
      <div class="chi-epanel__collapse">
        <div class="-done--only">
          Use this area to present
          a read-only summary of what the user
          entered or selected in step 3.
          (e.g.) installation date
        </div>
      </div>
    </div>
    <div class="chi-epanel__action -done--only">
      <button class="chi-button -primary -flat" data-chi-epanel-action="active">Change</button>
    </div>
  </div>
  <div class="chi-epanel__collapse">
    <div class="-active--only">
      <div class="chi-epanel__body">
        <div class="chi-epanel__content">
          <div class="chi-epanel__subtitle">Optional subtitle</div>
          <p class="chi-epanel__text">Content in expansion panel (e.g. a form to select installation date)</p>
        </div>
        <div class="chi-epanel__footer -justify-content--end">
          <button class="chi-button" data-chi-epanel-action="previous">Previous</button>
          <button class="chi-button -primary" data-chi-epanel-action="done">Continue</button>
        </div>
      </div>
    </div>
  </div>
</div>
<!-- Disabled state -->
<div class="chi-epanel -disabled" data-chi-epanel-group="example__state">
  <div class="chi-epanel__header">
    <div class="chi-epanel__number">4.</div>
    <div class="chi-epanel__title">Disabled state</div>
    <div class="chi-epanel__content">
      <div class="chi-epanel__collapse">
        <div class="-done--only">
          Use this area to present
          a read-only summary of what the user
          entered or selected in step 4.
          (e.g.) payment method
        </div>
      </div>
    </div>
    <div class="chi-epanel__action -done--only">
      <button class="chi-button -primary -flat" data-chi-epanel-action="active">Change</button>
    </div>
  </div>
  <div class="chi-epanel__collapse">
    <div class="-active--only">
      <div class="chi-epanel__body">
        <div class="chi-epanel__content">
          <div class="chi-epanel__subtitle">Optional subtitle</div>
          <p class="chi-epanel__text">Content in expansion panel (e.g. a form to enter payment method)</p>
        </div>
        <div class="chi-epanel__footer -justify-content--end">
          <button class="chi-button" data-chi-epanel-action="previous">Previous</button>
          <button class="chi-button -primary" data-chi-epanel-action="next">Finish</button>
        </div>
      </div>
    </div>
  </div>
</div>

State Icon

Use state icon to render an icon that corresponds with the state of the panel.

Optional subtitle

Content in expansion panel (e.g. a form to select a product package)

Optional subtitle

Content in expansion panel (e.g. a form to enter shipping address)

Optional subtitle

Content in expansion panel (e.g. a form to select installation date)

Optional subtitle

Content in expansion panel (e.g. a form to enter payment method)

Web Component
HTML Blueprint

<chi-expansion-panel step="1" title="Panel title" state="active" state-icon>
  <div slot="active">
    <div class="chi-epanel__subtitle">
      Optional subtitle
    </div>
    <p class="chi-epanel__text">
      Content in expansion panel (e.g. a form to select a product package)
    </p>
  </div>
  <div slot="footer">
    <chi-button color="primary">
      Continue
    </chi-button>
  </div>
</chi-expansion-panel>
<chi-expansion-panel step="2" title="Panel title" state-icon></chi-expansion-panel>
<chi-expansion-panel step="3" title="Panel title" state-icon></chi-expansion-panel>
<chi-expansion-panel step="4" title="Panel title" state-icon></chi-expansion-panel>

This HTML Blueprint requires JavaScript. You may use your own solution, or use Chi's vanilla JavaScript solution, Chi.js.

<!-- JavaScript -->
<script>chi.expansionPanel(document.querySelectorAll('[data-chi-epanel-group="example__base"]'));</script>

<!-- HTML -->
<div class="chi-epanel -state-icon -active" data-chi-epanel-group="example__base">
  <div class="chi-epanel__header">
    <div class="chi-epanel__number">1.</div>
    <div class="chi-epanel__title">Panel title</div>
    <div class="chi-epanel__content">
      <div class="chi-epanel__collapse">
        <div class="-done--only">
          Use this area to present
          a read-only summary of what the user
          entered or selected in step 1.
          (e.g.) a package selection
        </div>
      </div>
    </div>
    <div class="chi-epanel__action -done--only">
      <button class="chi-button -primary -flat" data-chi-epanel-action="active">Change</button>
    </div>
  </div>
  <div class="chi-epanel__collapse">
    <div class="-active--only">
      <div class="chi-epanel__body">
        <div class="chi-epanel__content">
          <div class="chi-epanel__subtitle">Optional subtitle</div>
          <p class="chi-epanel__text">Content in expansion panel (e.g. a form to select a product package)</p>
        </div>
        <div class="chi-epanel__footer -justify-content--end">
          <button class="chi-button -primary" data-chi-epanel-action="next">Continue</button>
        </div>
      </div>
    </div>
  </div>
</div>
<div class="chi-epanel -state-icon" data-chi-epanel-group="example__base">
  <div class="chi-epanel__header">
    <div class="chi-epanel__number">2.</div>
    <div class="chi-epanel__title">Panel title</div>
    <div class="chi-epanel__content">
      <div class="chi-epanel__collapse">
        <div class="-done--only">
          Use this area to present
          a read-only summary of what the user
          entered or selected in step 2.
          (e.g.) shipping address
        </div>
      </div>
    </div>
    <div class="chi-epanel__action -done--only">
      <button class="chi-button -primary -flat" data-chi-epanel-action="active">Change</button>
    </div>
  </div>
  <div class="chi-epanel__collapse">
    <div class="-active--only">
      <div class="chi-epanel__body">
        <div class="chi-epanel__content">
          <div class="chi-epanel__subtitle">Optional subtitle</div>
          <p class="chi-epanel__text">Content in expansion panel (e.g. a form to enter shipping address)</p>
        </div>
        <div class="chi-epanel__footer -justify-content--end">
          <button class="chi-button" data-chi-epanel-action="previous">Previous</button>
          <button class="chi-button -primary" data-chi-epanel-action="next">Continue</button>
        </div>
      </div>
    </div>
  </div>
</div>
<div class="chi-epanel -state-icon" data-chi-epanel-group="example__base">
  <div class="chi-epanel__header">
    <div class="chi-epanel__number">3.</div>
    <div class="chi-epanel__title">Panel title</div>
    <div class="chi-epanel__content">
      <div class="chi-epanel__collapse">
        <div class="-done--only">
          Use this area to present
          a read-only summary of what the user
          entered or selected in step 3.
          (e.g.) installation date
        </div>
      </div>
    </div>
    <div class="chi-epanel__action -done--only">
      <button class="chi-button -primary -flat" data-chi-epanel-action="active">Change</button>
    </div>
  </div>
  <div class="chi-epanel__collapse">
    <div class="-active--only">
      <div class="chi-epanel__body">
        <div class="chi-epanel__content">
          <div class="chi-epanel__subtitle">Optional subtitle</div>
          <p class="chi-epanel__text">Content in expansion panel (e.g. a form to select installation date)</p>
        </div>
        <div class="chi-epanel__footer -justify-content--end">
          <button class="chi-button" data-chi-epanel-action="previous">Previous</button>
          <button class="chi-button -primary" data-chi-epanel-action="next">Continue</button>
        </div>
      </div>
    </div>
  </div>
</div>
<div class="chi-epanel -state-icon" data-chi-epanel-group="example__base">
  <div class="chi-epanel__header">
    <div class="chi-epanel__number">4.</div>
    <div class="chi-epanel__title">Panel title</div>
    <div class="chi-epanel__content">
      <div class="chi-epanel__collapse">
        <div class="-done--only">
          Use this area to present
          a read-only summary of what the user
          entered or selected in step 4.
          (e.g.) payment method
        </div>
      </div>
    </div>
    <div class="chi-epanel__action -done--only">
      <button class="chi-button -primary -flat" data-chi-epanel-action="active">Change</button>
    </div>
  </div>
  <div class="chi-epanel__collapse">
    <div class="-active--only">
      <div class="chi-epanel__body">
        <div class="chi-epanel__content">
          <div class="chi-epanel__subtitle">Optional subtitle</div>
          <p class="chi-epanel__text">Content in expansion panel (e.g. a form to enter payment method)</p>
        </div>
        <div class="chi-epanel__footer -justify-content--end">
          <button class="chi-button" data-chi-epanel-action="previous">Previous</button>
          <button class="chi-button -primary" data-chi-epanel-action="done">Finish</button>
        </div>
      </div>
    </div>
  </div>
</div>

No step number

Step numbering is optional and can be easily omitted.

Optional subtitle

Content in expansion panel (e.g. a form to select a product package)

Optional subtitle

Content in expansion panel (e.g. a form to enter shipping address)

Optional subtitle

Content in expansion panel (e.g. a form to select installation date)

Optional subtitle

Content in expansion panel (e.g. a form to enter payment method)

Web Component
HTML Blueprint

Step numbering can be omitted by removing the step property.

<chi-expansion-panel title="Panel title" state="active">
  <div slot="active">
    <div class="chi-epanel__subtitle">
      Optional subtitle
    </div>
    <p class="chi-epanel__text">
      Content in expansion panel (e.g. a form to select a product package)
    </p>
  </div>
  <div slot="footer">
    <chi-button color="primary">
      Continue
    </chi-button>
  </div>
</chi-expansion-panel>
<chi-expansion-panel title="Panel title"></chi-expansion-panel>
<chi-expansion-panel title="Panel title"></chi-expansion-panel>
<chi-expansion-panel title="Panel title"></chi-expansion-panel>

This HTML Blueprint requires JavaScript. You may use your own solution, or use Chi's vanilla JavaScript solution, Chi.js. Step numbering can be omitted by applying -no-step to chi-epanel and removing chi-epanel__number.

<!-- JavaScript -->
<script>chi.expansionPanel(document.querySelectorAll('[data-chi-epanel-group="example__no-step-number"]'));</script>

<!-- HTML -->
<div class="chi-epanel -no-step -active" data-chi-epanel-group="example__no-step-number">
  <div class="chi-epanel__header">
    <div class="chi-epanel__title">Panel title</div>
    <div class="chi-epanel__content">
      <div class="chi-epanel__collapse -ml--0">
        <div class="-done--only">
          Use this area to present
          a read-only summary of what the user
          entered or selected in step 1.
          (e.g.) a package selection
        </div>
      </div>
    </div>
    <div class="chi-epanel__action -done--only">
      <button class="chi-button -primary -flat" data-chi-epanel-action="active">Change</button>
    </div>
  </div>
  <div class="chi-epanel__collapse">
    <div class="-active--only">
      <div class="chi-epanel__body">
        <div class="chi-epanel__content">
          <div class="chi-epanel__subtitle">Optional subtitle</div>
          <p class="chi-epanel__text">Content in expansion panel (e.g. a form to select a product package)</p>
        </div>
        <div class="chi-epanel__footer -justify-content--end">
          <button class="chi-button -primary" data-chi-epanel-action="next">Continue</button>
        </div>
      </div>
    </div>
  </div>
</div>
<div class="chi-epanel -no-step" data-chi-epanel-group="example__no-step-number">
  <div class="chi-epanel__header">
    <div class="chi-epanel__title">Panel title</div>
    <div class="chi-epanel__content">
      <div class="chi-epanel__collapse -ml--0">
        <div class="-done--only">
          Use this area to present
          a read-only summary of what the user
          entered or selected in step 2.
          (e.g.) shipping address
        </div>
      </div>
    </div>
    <div class="chi-epanel__action -done--only">
      <button class="chi-button -primary -flat" data-chi-epanel-action="active">Change</button>
    </div>
  </div>
  <div class="chi-epanel__collapse">
    <div class="-active--only">
      <div class="chi-epanel__body">
        <div class="chi-epanel__content">
          <div class="chi-epanel__subtitle">Optional subtitle</div>
          <p class="chi-epanel__text">Content in expansion panel (e.g. a form to enter shipping address)</p>
        </div>
        <div class="chi-epanel__footer -justify-content--end">
          <button class="chi-button" data-chi-epanel-action="previous">Previous</button>
          <button class="chi-button -primary" data-chi-epanel-action="next">Continue</button>
        </div>
      </div>
    </div>
  </div>
</div>
<div class="chi-epanel -no-step" data-chi-epanel-group="example__no-step-number">
  <div class="chi-epanel__header">
    <div class="chi-epanel__title">Panel title</div>
    <div class="chi-epanel__content">
      <div class="chi-epanel__collapse -ml--0">
        <div class="-done--only">
          Use this area to present
          a read-only summary of what the user
          entered or selected in step 3.
          (e.g.) installation date
        </div>
      </div>
    </div>
    <div class="chi-epanel__action -done--only">
      <button class="chi-button -primary -flat" data-chi-epanel-action="active">Change</button>
    </div>
  </div>
  <div class="chi-epanel__collapse">
    <div class="-active--only">
      <div class="chi-epanel__body">
        <div class="chi-epanel__content">
          <div class="chi-epanel__subtitle">Optional subtitle</div>
          <p class="chi-epanel__text">Content in expansion panel (e.g. a form to select installation date)</p>
        </div>
        <div class="chi-epanel__footer -justify-content--end">
          <button class="chi-button" data-chi-epanel-action="previous">Previous</button>
          <button class="chi-button -primary" data-chi-epanel-action="next">Continue</button>
        </div>
      </div>
    </div>
  </div>
</div>
<div class="chi-epanel -no-step" data-chi-epanel-group="example__no-step-number">
  <div class="chi-epanel__header">
    <div class="chi-epanel__title">Panel title</div>
    <div class="chi-epanel__content">
      <div class="chi-epanel__collapse -ml--0">
        <div class="-done--only">
          Use this area to present
          a read-only summary of what the user
          entered or selected in step 4.
          (e.g.) payment method
        </div>
      </div>
    </div>
    <div class="chi-epanel__action -done--only">
      <button class="chi-button -primary -flat" data-chi-epanel-action="active">Change</button>
    </div>
  </div>
  <div class="chi-epanel__collapse">
    <div class="-active--only">
      <div class="chi-epanel__body">
        <div class="chi-epanel__content">
          <div class="chi-epanel__subtitle">Optional subtitle</div>
          <p class="chi-epanel__text">Content in expansion panel (e.g. a form to enter payment method)</p>
        </div>
        <div class="chi-epanel__footer -justify-content--end">
          <button class="chi-button" data-chi-epanel-action="previous">Previous</button>
          <button class="chi-button -primary" data-chi-epanel-action="done">Finish</button>
        </div>
      </div>
    </div>
  </div>
</div>

Bordered

Use bordered to apply borders to panels and contain them in card styled boxes.

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Web Component
HTML Blueprint

To render bordered panels, apply the property bordered.

<!-- Done state -->
<chi-expansion-panel title="Done panel" bordered state="done">
  <div slot="done">
    Use this area to present
    a read-only summary of what the user
    entered or selected in step 1.
  </div>
  <div slot="change">
    <chi-button color="primary" variant="flat">
      Change
    </chi-button>
  </div>
</chi-expansion-panel>
<!-- Active state -->
<chi-expansion-panel title="Active panel" bordered state="active">
  <div slot="active">
    <div class="chi-epanel__subtitle">
      Optional subtitle
    </div>
    <p class="chi-epanel__text">
      Content goes here
    </p>
  </div>
  <div slot="footer">
    <chi-button color="primary">
      Continue
    </chi-button>
  </div>
</chi-expansion-panel>
<!-- Pending state -->
<chi-expansion-panel title="Pending panel" bordered></chi-expansion-panel>
<!-- Disabled state -->
<chi-expansion-panel title="Disabled panel" bordered state="disabled"></chi-expansion-panel>

This HTML Blueprint requires JavaScript. You may use your own solution, or use Chi's vanilla JavaScript solution, Chi.js. To render bordered panels, apply the class -bordered.

<!-- JavaScript -->
<script>chi.expansionPanel(document.querySelectorAll('[data-chi-epanel-group="example__bordered"]'));</script>

<!-- HTML -->
<!-- Done state -->
<div class="chi-epanel -bordered -done" data-chi-epanel-group="example__bordered">
  <div class="chi-epanel__header">
    <div class="chi-epanel__title">Done state</div>
    <div class="chi-epanel__content">
      <div class="chi-epanel__collapse">
        <div class="-done--only">
          Use this area to present
          a read-only summary of what the user
          entered or selected in step 1.
        </div>
      </div>
    </div>
    <div class="chi-epanel__action -done--only">
      <button class="chi-button -primary -flat" data-chi-epanel-action="active">Change</button>
    </div>
  </div>
  <div class="chi-epanel__collapse">
    <div class="-active--only">
      <div class="chi-epanel__body">
        <div class="chi-epanel__content">
          <div class="chi-epanel__subtitle">Optional subtitle</div>
          <p class="chi-epanel__text">Content goes here</p>
        </div>
        <div class="chi-epanel__footer -justify-content--end">
          <button class="chi-button -primary" data-chi-epanel-action="next">Continue</button>
        </div>
      </div>
    </div>
  </div>
</div>
<!-- Active state -->
<div class="chi-epanel -bordered -active" data-chi-epanel-group="example__bordered">
  <div class="chi-epanel__header">
    <div class="chi-epanel__title">Active state</div>
    <div class="chi-epanel__content">
      <div class="chi-epanel__collapse">
        <div class="-done--only">
          Use this area to present
          a read-only summary of what the user
          entered or selected in step 2.
        </div>
      </div>
    </div>
    <div class="chi-epanel__action -done--only">
      <button class="chi-button -primary -flat" data-chi-epanel-action="active">Change</button>
    </div>
  </div>
  <div class="chi-epanel__collapse">
    <div class="-active--only">
      <div class="chi-epanel__body">
        <div class="chi-epanel__content">
          <div class="chi-epanel__subtitle">Optional subtitle</div>
          <p class="chi-epanel__text">Content goes here</p>
        </div>
        <div class="chi-epanel__footer -justify-content--end">
          <button class="chi-button" data-chi-epanel-action="previous">Previous</button>
          <button class="chi-button -primary" data-chi-epanel-action="next">Continue</button>
        </div>
      </div>
    </div>
  </div>
</div>
<!-- Pending state -->
<div class="chi-epanel -bordered -pending" data-chi-epanel-group="example__bordered">
  <div class="chi-epanel__header">
    <div class="chi-epanel__title">Pending state</div>
    <div class="chi-epanel__content">
      <div class="chi-epanel__collapse">
        <div class="-done--only">
          Use this area to present
          a read-only summary of what the user
          entered or selected in step 3.
        </div>
      </div>
    </div>
    <div class="chi-epanel__action -done--only">
      <button class="chi-button -primary -flat" data-chi-epanel-action="active">Change</button>
    </div>
  </div>
  <div class="chi-epanel__collapse">
    <div class="-active--only">
      <div class="chi-epanel__body">
        <div class="chi-epanel__content">
          <div class="chi-epanel__subtitle">Optional subtitle</div>
          <p class="chi-epanel__text">Content goes here</p>
        </div>
        <div class="chi-epanel__footer -justify-content--end">
          <button class="chi-button" data-chi-epanel-action="previous">Previous</button>
          <button class="chi-button -primary" data-chi-epanel-action="done">Continue</button>
        </div>
      </div>
    </div>
  </div>
</div>
<!-- Disabled state -->
<div class="chi-epanel -bordered -disabled" data-chi-epanel-group="example__bordered">
  <div class="chi-epanel__header">
    <div class="chi-epanel__title">Disabled state</div>
    <div class="chi-epanel__content">
      <div class="chi-epanel__collapse">
        <div class="-done--only">
          Use this area to present
          a read-only summary of what the user
          entered or selected in step 4.
        </div>
      </div>
    </div>
    <div class="chi-epanel__action -done--only">
      <button class="chi-button -primary -flat" data-chi-epanel-action="active">Change</button>
    </div>
  </div>
  <div class="chi-epanel__collapse">
    <div class="-active--only">
      <div class="chi-epanel__body">
        <div class="chi-epanel__content">
          <div class="chi-epanel__subtitle">Optional subtitle</div>
          <p class="chi-epanel__text">Content goes here</p>
        </div>
        <div class="chi-epanel__footer -justify-content--end">
          <button class="chi-button" data-chi-epanel-action="previous">Previous</button>
          <button class="chi-button -primary" data-chi-epanel-action="next">Finish</button>
        </div>
      </div>
    </div>
  </div>
</div>

Free mode

In this mode there is no automated action triggered when an element activates, so you will need to manage all custom behavior.

Optional subtitle

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Web Component
HTML Blueprint

This HTML Blueprint requires JavaScript. You may use your own solution, or use Chi's vanilla JavaScript solution, Chi.js.

<div class="chi-epanel -no-step -active" data-chi-epanel-group="example__free-mode">
  <div class="chi-epanel__header">
    <div class="chi-epanel__title" data-chi-epanel-action="toggle">Panel 1</div>
  </div>
  <div class="chi-epanel__collapse">
    <div class="-active--only">
      <div class="chi-epanel__body">
        <div class="chi-epanel__content">
          <div class="chi-epanel__subtitle">Optional subtitle</div>
          <p class="chi-epanel__text">Content goes here</p>
        </div>
        <div class="chi-epanel__footer -justify-content--end">
          <button class="chi-button -primary" data-chi-epanel-action="next">Continue</button>
        </div>
      </div>
    </div>
  </div>
</div>
<div class="chi-epanel -no-step" data-chi-epanel-group="example__free-mode">
  <div class="chi-epanel__header">
    <div class="chi-epanel__title" data-chi-epanel-action="toggle">Panel 2</div>
  </div>
  <div class="chi-epanel__collapse">
    <div class="-active--only">
      <div class="chi-epanel__body">
        <div class="chi-epanel__content">
          <div class="chi-epanel__subtitle">Optional subtitle</div>
          <p class="chi-epanel__text">Content goes here</p>
        </div>
        <div class="chi-epanel__footer -justify-content--end">
          <button class="chi-button" data-chi-epanel-action="previous">Previous</button>
          <button class="chi-button -primary" data-chi-epanel-action="next">Continue</button>
        </div>
      </div>
    </div>
  </div>
</div>
<div class="chi-epanel -no-step" data-chi-epanel-group="example__free-mode">
  <div class="chi-epanel__header">
    <div class="chi-epanel__title" data-chi-epanel-action="toggle">Panel 3</div>
  </div>
  <div class="chi-epanel__collapse">
    <div class="-active--only">
      <div class="chi-epanel__body">
        <div class="chi-epanel__content">
          <div class="chi-epanel__subtitle">Optional subtitle</div>
          <p class="chi-epanel__text">Content goes here</p>
        </div>
        <div class="chi-epanel__footer -justify-content--end">
          <button class="chi-button" data-chi-epanel-action="previous">Previous</button>
          <button class="chi-button -primary" data-chi-epanel-action="next">Continue</button>
        </div>
      </div>
    </div>
  </div>
</div>
<div class="chi-epanel -no-step" data-chi-epanel-group="example__free-mode">
  <div class="chi-epanel__header">
    <div class="chi-epanel__title" data-chi-epanel-action="toggle">Panel 4</div>
  </div>
  <div class="chi-epanel__collapse">
    <div class="-active--only">
      <div class="chi-epanel__body">
        <div class="chi-epanel__content">
          <div class="chi-epanel__subtitle">Optional subtitle</div>
          <p class="chi-epanel__text">Content goes here</p>
        </div>
        <div class="chi-epanel__footer -justify-content--end">
          <button class="chi-button" data-chi-epanel-action="previous">Previous</button>
          <button class="chi-button -primary" data-chi-epanel-action="next">Continue</button>
        </div>
      </div>
    </div>
  </div>
</div>
<!-- JavaScript -->
<script>
  chi.expansionPanel(
    document.querySelectorAll('[data-chi-epanel-group="example__free-mode"]'),
    {mode: 'free'}
  );
</script>

Custom mode

Write your own custom mode by adding a handler for state changes of the expansion panels in the configuration, and writing your own functions for the active, done, pending, disabled, toggle, next and previous actions. In the example, the component behaves similar to the accordion but alternates between done and pending states instead of active and pending states. The overridden action functions are for documentation purposes only because they clone the functionality of the default ones.

Web Component
HTML Blueprint

This HTML Blueprint requires JavaScript. You may use your own solution, or use Chi's vanilla JavaScript solution, Chi.js.

<div class="chi-epanel -done" data-chi-epanel-group="example__custom-mode">
  <div class="chi-epanel__header">
    <div class="chi-epanel__title" data-chi-epanel-action="done">Panel 1</div>
    <div class="chi-epanel__content">
      <div class="chi-epanel__collapse">
        <div class="-done--only">
          Lorem ipsum dolor sit amet, consectetur adipiscing elit. Aliquam varius arcu nisl, non accumsan elit
          interdum et. Nunc ut gravida justo. Nulla sit amet est accumsan, condimentum elit nec, dapibus nulla.
          Aenean eu sapien eget ante placerat pretium a sit amet ante.
        </div>
      </div>
    </div>
  </div>
</div>
<div class="chi-epanel" data-chi-epanel-group="example__custom-mode">
  <div class="chi-epanel__header">
    <div class="chi-epanel__title" data-chi-epanel-action="done">Panel 2</div>
    <div class="chi-epanel__content">
      <div class="chi-epanel__collapse">
        <div class="-done--only">
          Lorem ipsum dolor sit amet, consectetur adipiscing elit. Aliquam varius arcu nisl, non accumsan elit
          interdum et. Nunc ut gravida justo. Nulla sit amet est accumsan, condimentum elit nec, dapibus nulla.
          Aenean eu sapien eget ante placerat pretium a sit amet ante.
        </div>
      </div>
    </div>
  </div>
</div>
<div class="chi-epanel" data-chi-epanel-group="example__custom-mode">
  <div class="chi-epanel__header">
    <div class="chi-epanel__title" data-chi-epanel-action="done">Panel 3</div>
    <div class="chi-epanel__content">
      <div class="chi-epanel__collapse">
        <div class="-done--only">
          Lorem ipsum dolor sit amet, consectetur adipiscing elit. Aliquam varius arcu nisl, non accumsan elit
          interdum et. Nunc ut gravida justo. Nulla sit amet est accumsan, condimentum elit nec, dapibus nulla.
          Aenean eu sapien eget ante placerat pretium a sit amet ante.
        </div>
      </div>
    </div>
  </div>
</div>
<div class="chi-epanel" data-chi-epanel-group="example__custom-mode">
  <div class="chi-epanel__header">
    <div class="chi-epanel__title" data-chi-epanel-action="done">Panel 4</div>
    <div class="chi-epanel__content">
      <div class="chi-epanel__collapse">
        <div class="-done--only">
          Lorem ipsum dolor sit amet, consectetur adipiscing elit. Aliquam varius arcu nisl, non accumsan elit
          interdum et. Nunc ut gravida justo. Nulla sit amet est accumsan, condimentum elit nec, dapibus nulla.
          Aenean eu sapien eget ante placerat pretium a sit amet ante.
        </div>
      </div>
    </div>
  </div>
</div>
<!-- JavaScript -->
<script>
  chi.expansionPanel(
    document.querySelectorAll('[data-chi-epanel-group="example__custom-mode"]'),
    {
      mode: 'custom',
      changeHandler: function (newState, oldState, expansionPanel, panelGroup) {
        if (newState === chi.EXPANSION_PANEL_STATES.DONE) {
          panelGroup.expansion_panels.forEach(function (exPa) {
            if (exPa !== expansionPanel) {
              exPa.setState(chi.EXPANSION_PANEL_STATES.PENDING.NAME);
            }
          });
        }
      },
      customActions: {
        active: (expansionPanel, epGroup) =>
          expansionPanel.setState(chi.EXPANSION_PANEL_STATES.ACTIVE.NAME),
        done: (expansionPanel, epGroup) =>
          expansionPanel.setState(chi.EXPANSION_PANEL_STATES.DONE.NAME),
        pending: (expansionPanel, epGroup) =>
          expansionPanel.setState(chi.EXPANSION_PANEL_STATES.PENDING.NAME),
        toggle: (expansionPanel, epGroup) => {
          if (expansionPanel._state === chi.EXPANSION_PANEL_STATES.ACTIVE) {
            expansionPanel.setState(chi.EXPANSION_PANEL_STATES.PENDING.NAME);
          } else {
            expansionPanel.setState(chi.EXPANSION_PANEL_STATES.ACTIVE.NAME);
          }
        },
        next: (expansionPanel, epGroup) => {
          epGroup.reset(expansionPanel);
          epGroup.next().setState(chi.EXPANSION_PANEL_STATES.ACTIVE.NAME);
        },
        previous: (expansionPanel, epGroup) => {
          epGroup.reset(expansionPanel);
          epGroup.previous().setState(chi.EXPANSION_PANEL_STATES.ACTIVE.NAME);
        },
        disabled: (expansionPanel, epGroup) =>
          expansionPanel.setState(chi.EXPANSION_PANEL_STATES.DISABLED.NAME)
      }
    }
  );
</script>

Web Component

Properties

Property	Attribute	Description	Type	Default
`bordered`	`bordered`	to set the panel style to bordered	`boolean`	undefined
`state`	`state`	to set expansion panel state. Possible values are: {'done', 'active', 'pending' (default value), and 'disabled'}	`string`	`'pending'`
`stateIcon`	`state-icon`	to render a state icon within the panel	`boolean`	`false`
`step`	`step`	to set a step number next to the title of the panel	`string`	undefined
`title`	`title`	to define expansion panel title.	`string`	undefined

JavaScript

Actions

You can bind actions to activators inside the expansion panel with the data-chi-epanel-action attribute.

Action	Description
`pending`	Sets the panel to the pending state. All the contents under the `-active--only` and the `-done--only` will not be visible.
`active`	Sets the panel to the active state. All the contents under the `-active--only` will be visible.
`toggle`	In the case the panel is previously set to active, this action sets it to pending. It sets to active state otherwise.
`done`	Sets the panel to the done state. All the contents under the `-done--only` will be visible.
`disabled`	Sets the panel to the disabled state. All the contents under the `-active--only` and the `-done--only` will not be visible, and the title will render in a soft grey color.
`inactive`	Is a synonym for `pending`.
`next`	Sets the next panel in `active` status.
`previous`	Sets the previous panel in `active` status.

You can freely add, remove or change the data-chi-epanel-action attribute on the fly, as is the main element with the chi-epanel class, the one which listens for the events.

Preventing memory leaks

Expansion panel components have a dispose function to free all resources attached to the element, such as event listeners and object data. You should call this method when you want to remove the component.

var elemArray = document.querySelectorAll('[data-chi-epanel-group="groupName"]');
var expansionPanelsArray = chi.expansionPanel(elemArray);
// do stuff
expansionPanelsArray.forEach(function (expansionPanel) {
  expansionPanel.dispose();
});

It is safe to call the expansionPanel method more than once, as it will return any previously created expansion panel component associated to the element.

var elem = document.getElementById('expansion-panel-1');
var expansionPanelComponent = chi.expansionPanel(elem);
var elem2 = document.getElementById('expansion-panel-1');
var expansionPanelComponent2 = chi.expansionPanel(elem2);
expansionPanelComponent === expansionPanelComponent2; // returns true

expansionPanelComponent.dispose(); // Only have to do it once.

Accessibility

Accessibility guidelines coming soon