Overview for tabs

Angular Material tabs organize content into separate views where only one view can be visible at a time. Each tab's label is shown in the tab header and the active tab's label is designated with the animated ink bar. When the list of tab labels exceeds the width of the header, pagination controls appear to let the user scroll left and right across the labels.

The active tab may be set using the selectedIndex input or when the user selects one of the tab labels in the header.

Basic use of the tab group
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The selectedTabChange output event is emitted when the active tab changes.

The focusChange output event is emitted when the user puts focus on any of the tab labels in the header, usually through keyboard navigation.

If a tab's label is only text then the simple tab-group API can be used.

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For more complex labels, add a template with the mat-tab-label directive inside the mat-tab.

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By default, the tab group will not change its height to the height of the currently active tab. To change this, set the dynamicHeight input to true. The tab body will animate its height according to the height of the active tab.

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While <mat-tab-group> is used to switch between views within a single route, <nav mat-tab-nav-bar> provides a tab-like UI for navigating between routes.

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The mat-tab-nav-bar is not tied to any particular router; it works with normal <a> elements and uses the active property to determine which tab is currently active. The corresponding <router-outlet> must be wrapped in an <mat-tab-nav-panel> component and should typically be placed relatively close to the mat-tab-nav-bar (see Accessibility).

By default, the tab contents are eagerly loaded. Eagerly loaded tabs will initialize the child components but not inject them into the DOM until the tab is activated.

If the tab contains several complex child components or the tab's contents rely on DOM calculations during initialization, it is advised to lazy load the tab's content.

Tab contents can be lazy loaded by declaring the body in a ng-template with the matTabContent attribute.

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If you want to align the tab labels in the center or towards the end of the container, you can do so using the [mat-align-tabs] attribute.

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You can control the duration of the tabs' animation using the animationDuration input. If you want to disable the animation completely, you can do so by setting the properties to 0ms. The duration can be configured globally using the MAT_TABS_CONFIG injection token.

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By default the <mat-tab-group> will remove the content of off-screen tabs from the DOM until they come into the view. This is optimal for most cases since it keeps the DOM size smaller, but it isn't great for others like when a tab has an <audio> or <video> element, because the content will be re-initialized whenever the user navigates to the tab. If you want to keep the content of off-screen tabs in the DOM, you can set the preserveContent input to true.

Tab group that keeps its content inside the DOM when it's off-screen.
This example contains tests. Open in Stackblitz to run the tests.

MatTabGroup and MatTabNavBar both implement the ARIA Tabs design pattern. Both components compose tablist, tab, and tabpanel elements with handling for keyboard inputs and focus management.

When using MatTabNavBar, you should place the <mat-tab-nav-panel> component relatively close to if not immediately adjacent to the <nav mat-tab-nav-bar> component so that it's easy for screen reader users to identify the association.

Always provide an accessible label via aria-label or aria-describedby for tabs without descriptive text content.

When using MatTabNavGroup, always specify a label for the <nav> element.

MatTabGroup and MatTabNavBar both implement the following keyboard interactions:

Shortcut Action
LEFT_ARROW Move focus to previous tab
RIGHT_ARROW Move focus to next tab
HOME Move focus to first tab
END Move focus to last tab
SPACE or ENTER Switch to focused tab
Azure & Blue theme selected.