AMP
  • websites

Tab Panels with amp-selector

Introduction

This is an implementation of tab panels that uses amp-selector. Tabs and tab panels are positioned via flexbox and amp-selector uses the selected attribute to show/hide the correct tab panel and style the selected tab.

Setup

Import amp-selector component in the header which we'll use to implement the tab switching.

<script async custom-element="amp-selector" src="https://cdn.ampproject.org/v0/amp-selector-0.1.js"></script>

There's just a bit of CSS that's needed.

<style amp-custom>
    :root {
      --color-primary: #005AF0;
      --space-1: .5rem;  /* 8px */
      --space-4: 2rem;   /* 32px */
    }

    /* Styles for the flex layout based tabs */
    amp-selector[role=tablist].tabs-with-flex {
        display: flex;
        flex-wrap: wrap;
    }
    amp-selector[role=tablist].tabs-with-flex [role=tab] {
        flex-grow: 1;
        /* custom styling, feel free to change */
        text-align: center;
        padding: var(--space-1);
    }
    amp-selector[role=tablist].tabs-with-flex [role=tab][selected] {
        outline: none;
        /* custom styling, feel free to change */
        border-bottom: 2px solid var(--color-primary);
    }
    amp-selector[role=tablist].tabs-with-flex [role=tabpanel] {
        display: none;
        width: 100%;
        order: 1; /* must be greater than the order of the tab buttons to flex to the next line */
        /* custom styling, feel free to change */
        padding: var(--space-4);
    }
    amp-selector[role=tablist].tabs-with-flex [role=tab][selected] + [role=tabpanel] {
        display: block;
    }

    /* Styles for the selector based tabs */
    amp-selector[role=tablist].tabs-with-selector {
        display: flex;
    }
    amp-selector[role=tablist].tabs-with-selector [role=tab][selected] {
        outline: none;
        /* custom styling, feel free to change */
        border-bottom: 2px solid var(--color-primary);
    }
    amp-selector[role=tablist].tabs-with-selector {
        display: flex;
    }
    amp-selector[role=tablist].tabs-with-selector [role=tab] {
      /* custom styling, feel free to change */
      width: 100%;
      text-align: center;
      padding: var(--space-1);
    }
    amp-selector.tabpanels [role=tabpanel] {
      display: none;
      /* custom styling, feel free to change */
      padding: var(--space-4);
    }
    amp-selector.tabpanels [role=tabpanel][selected] {
      outline: none;
      display: block;
    }

</style>

Simple tabs using a flex layout

This is the most basic example with three panels. Each tabpanel is defined below it's tab and is hidden by default. Only if a tab is selected, the tabpanel is set to visible via the following CSS rule:

amp-selector[role=tablist] [role=tab][selected] + [role=tabpanel] {
  display: block;
}

The tab content is positioned below the tab button using a flex layout.

Tab one content...
Tab two content...
Tab three content...
<amp-selector class="tabs-with-flex" role="tablist" keyboard-select-mode="focus">
  <div id="tab1" role="tab" aria-controls="tabpanel1" option selected>Tab one</div>
  <div id="tabpanel1" role="tabpanel" aria-labelledby="tab1">Tab one content... </div>
  <div id="tab2" role="tab" aria-controls="tabpanel2" option>Tab two</div>
  <div id="tabpanel2" role="tabpanel" aria-labelledby="tab2">Tab two content... </div>
  <div id="tab3" role="tab" aria-controls="tabpanel3" option>Tab three</div>
  <div id="tabpanel3" role="tabpanel" aria-labelledby="tab3">Tab three content... </div>
</amp-selector>

Selecting a tab via a button

We can use the amp-selector's toggle action to activate specific tabs: on="tap:myTabs.toggle(index=0, value=true)".

Tab one content...
Tab two content...
Tab three content...
<button on="tap:myTabs.toggle(index=0, value=true)">Select tab 1</button>
<button on="tap:myTabs.toggle(index=1, value=true)">Select tab 2</button>
<button on="tap:myTabs.toggle(index=2, value=true)">Select tab 3</button>

<amp-selector id="myTabs" class="tabs-with-flex" role="tablist" keyboard-select-mode="focus">
  <div id="sample2-tab1" role="tab" aria-controls="sample2-tabpanel1" option selected>Tab one</div>
  <div id="sample2-tabpanel1" role="tabpanel" aria-labelledby="sample2-tab1">Tab one content... </div>
  <div id="sample2-tab2" role="tab" aria-controls="sample2-tabpanel2" option>Tab two</div>
  <div id="sample2-tabpanel2" role="tabpanel" aria-labelledby="sample2-tab2">Tab two content... </div>
  <div id="sample2-tab3" role="tab" aria-controls="sample2-tabpanel3" option>Tab three</div>
  <div id="sample2-tabpanel3" role="tabpanel" aria-labelledby="sample2-tab3">Tab three content... </div>
</amp-selector>

A more flexible tab layout with two amp-selectors

If for any reason, the flex layout based approach is not feasible, it's possible to implement tabs and tabpanels using two different amp-selectors.

Tab one content...
Tab two content...
Tab three content...
<amp-selector class="tabs-with-selector" role="tablist" on="select:myTabPanels.toggle(index=event.targetOption, value=true)" keyboard-select-mode="focus">
  <div id="sample3-tab1" role="tab" aria-controls="sample3-tabpanel1" option="0" selected>Tab one</div>
  <div id="sample3-tab2" role="tab" aria-controls="sample3-tabpanel2" option="1">Tab two</div>
  <div id="sample3-tab3" role="tab" aria-controls="sample3-tabpanel3" option="2">Tab three</div>
</amp-selector>

<amp-selector id="myTabPanels" class="tabpanels">
  <div id="sample3-tabpanel1" role="tabpanel" aria-labelledby="sample3-tab1" option selected>Tab one content... </div>
  <div id="sample3-tabpanel2" role="tabpanel" aria-labelledby="sample3-tab2" option>Tab two content... </div>
  <div id="sample3-tabpanel3" role="tabpanel" aria-labelledby="sample3-tab3" option>Tab three content... </div>
</amp-selector>
Need further explanation?

If the explanations on this page don't cover all of your questions feel free to reach out to other AMP users to discuss your exact use case.

Go to Stack Overflow
An unexplained feature?

The AMP project strongly encourages your participation and contributions! We hope you'll become an ongoing participant in our open source community but we also welcome one-off contributions for the issues you're particularly passionate about.

Edit sample on GitHub