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.
<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)".
<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.
<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>
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