@material/toolbar

Toolbars

MDC Toolbar acts as a container for multiple rows containing items such as application title, navigation menu, and tabs, among other things. Toolbars scroll with content by default, but support fixed behavior as well.

When using the fixed pattern, a persistent elevation is added to toolbar. When using the waterfall pattern, a toolbar will have no elevation when the page is scrolled to the top, and gain elevation when a user begins to scroll down the page. Toolbars also support anchored only last row at the top behavior. For toolbars with this modifier, only the last row will be anchored at the top, while the rest of toolbar scrolls off.

Flexible behavior can be added to mdc-toolbar, where the height of the toolbar changes as the user scrolls. Flexible is defined as a modifier class of toolbar but not a standalone component. Toolbars using this modifier will have additional height added to their first rows.

Design & API Documentation

• Material Design guidelines: Toolbars
• Demo

Installation

npm install --save @material/toolbar

Usage

Wrap the items with mdc-toolbar class in the following way:

<header class="mdc-toolbar">
  <div class="mdc-toolbar__row">
    <section class="mdc-toolbar__section mdc-toolbar__section--align-start">
      <a href="#" class="material-icons mdc-toolbar__icon--menu">menu</a>
      <span class="mdc-toolbar__title">Title</span>
    </section>
  </div>
</header>

MDC Toolbars can accommodate multiple rows using the wrapper mdc-toolbar__row:

<header class="mdc-toolbar">
  <div class="mdc-toolbar__row">
    <section class="mdc-toolbar__section mdc-toolbar__section--align-start">
      <a href="#" class="material-icons mdc-toolbar__icon--menu">menu</a>
      <span class="mdc-toolbar__title">Title</span>
    </section>
  </div>
  <div class="mdc-toolbar__row">
    ...
  </div>
</header>

Sections

Toolbar sections are aligned to the toolbar's center. You can change this behavior by applying mdc-toolbar__section--align-start or mdc-toolbar__section--align-end to align the sections to the start or the end of the toolbar (respectively).

<header class="mdc-toolbar">
  <div class="mdc-toolbar__row">
    <section class="mdc-toolbar__section mdc-toolbar__section--align-start">
      Section aligns to start.
    </section>
    <section class="mdc-toolbar__section">
      Section aligns to center.
    </section>
    <section class="mdc-toolbar__section mdc-toolbar__section--align-end">
      Section aligns to end.
    </section>
  </div>
</header>

Toolbar sections are laid out using flexbox. Each section will take up an equal amount of space within the toolbar by default. But you can accommodate very long section (very long title) by adding mdc-toolbar__section--shrink-to-fit to other sections.

<div class="mdc-toolbar">
  <div class="mdc-toolbar__row">
      <section class="mdc-toolbar__section mdc-toolbar__section--align-start">
        <span class="mdc-toolbar__title">This is a super super super super long title</span>
      </section>
      <section class="mdc-toolbar__section mdc-toolbar__section--align-end mdc-toolbar__section--shrink-to-fit">
        <a class="material-icons search align-icons" aria-label="Search" alt="Search">search</a>
      </section>
  </div>
</div>

Toolbar title

You can use the mdc-toolbar__title element to style toolbar text representing a page's title, or an application name.

<header class="mdc-toolbar">
  <div class="mdc-toolbar__row">
    <section class="mdc-toolbar__section">
      <span class="mdc-toolbar__title">Title</span>
    </section>
  </div>
</header>

Toolbar Icons

Icons can be added as anchor tags, spans, or buttons to mdc-toolbar. There are two types of icons, mdc-toolbar__icon--menu represents the left most icon in mdc-toolbar usually to the left of mdc-toolbar__title. mdc-toolbar__icon represents any icons placed on the right side of an mdc-toolbar.

Fixed toolbars

By default, toolbars scroll with the page content. To keep the toolbar fixed to the top of the screen, add an mdc-toolbar--fixed class to the toolbar element.

Adjusting sibling elements of fixed toolbars

When using mdc-toolbar--fixed, you need to set the margin of the content to prevent toolbar overlaying your content. You can add the mdc-toolbar-fixed-adjust helper class to the toolbar's adjacent sibling element, which will add default margin-top.

When you are using mdc-toolbar with JavaScript, you should assign your content wrapper element to mdc-toolbar's instance property fixedAdjustElement. This will make mdc-toolbar aware of the wrapper class and adjust the margin-top correspondingly.

<header class="mdc-toolbar mdc-toolbar--fixed">
  <div class="mdc-toolbar__row">
    <section class="mdc-toolbar__section mdc-toolbar__section--align-start">
      <span class="mdc-toolbar__title">Title</span>
    </section>
  </div>
</header>
<main class="mdc-toolbar-fixed-adjust">
  <p class="demo-paragraph">
    A demo paragraph here.
  </p>
</main>

// When you are using toolbar with JavaScript
<script>
  var toolbar = mdc.toolbar.MDCToolbar.attachTo(document.querySelector('.mdc-toolbar'));
  toolbar.fixedAdjustElement = document.querySelector('.mdc-toolbar-fixed-adjust');
</script>

Waterfall toolbars (Requires JavaScript)

By adding mdc-toolbar--waterfall to mdc-toolbar--fixed, fixed toolbars become waterfall toolbars. Waterfall toolbar is initially static and has no elevation, and then when the user starts scrolling becomes fixed and gains elevation.

<header class="mdc-toolbar mdc-toolbar--fixed mdc-toolbar--waterfall">
  <div class="mdc-toolbar__row">
    <section class="mdc-toolbar__section mdc-toolbar__section--align-start">
      <span class="mdc-toolbar__title">Title</span>
    </section>
  </div>
</header>
<main class="mdc-toolbar-fixed-adjust">
  <p class="demo-paragraph">
    A demo paragraph here.
  </p>
</main>

<script>
  var toolbar = mdc.toolbar.MDCToolbar.attachTo(document.querySelector('.mdc-toolbar'));
  toolbar.fixedAdjustElement = document.querySelector('.mdc-toolbar-fixed-adjust');
</script>

Fixed Last Row Toolbar (Requires JavaScript)

By adding mdc-toolbar--fixed-lastrow-only to mdc-toolbar--fixed, fixed toolbars will anchor only the last row to the top.

<header class="mdc-toolbar mdc-toolbar--fixed mdc-toolbar--fixed-lastrow-only">
  <div class="mdc-toolbar__row">
    <!-- This row will scroll off screen -->
  </div>
  <div class="mdc-toolbar__row">
    <!-- This row will anchor on top of screen -->
  </div>
</header>

Flexible Toolbar (Requires JavaScript)

Flexible behavior can be added to mdc-toolbar, whose height changes as the user scrolls. Flexible behavior is highly customizable - we only define the change of flexible space size without making further assumptions. But we do recommend the height of flexible space should be an integral number of mdc-toolbar__row height and provide a easier way for user to customize height. Users can adjust the height of flexible space through sass variable $mdc-toolbar-ratio-to-extend-flexible or css variable --mdc-toolbar-ratio-to-extend-flexible.

<header class="mdc-toolbar mdc-toolbar--flexible">
  <div class="mdc-toolbar__row">
    ...
  </div>
</header>

Custom height of flexible space:

<style>
  #my-flexible-header {
    --mdc-toolbar-ratio-to-extend-flexible: 3;
  }
</style>
<header class="mdc-toolbar mdc-toolbar--flexible">
  <div class="mdc-toolbar__row">
    ...
  </div>
</header>

Flexible toolbars emit a change custom event with a detail object containing flexibleExpansionRatio property. The flexibleExpansionRatio property is a number from 0-1 representing the ratio of flexible space that has already been collapsed divided by the total amount of flexible space.

toolbar.listen('MDCToolbar:change', function(evt) {
  var flexibleExpansionRatio = evt.detail.flexibleExpansionRatio;
  console.log(flexibleExpansionRatio.toFixed(2));
});

For the most common use case of flexible headers, we've defined a default behavior:

• Flexible has a fixed initial height 4 times the default size of mdc-toolbar__row.
• When it has mdc-toolbar--flexible-default-behavior, it further defines the background and title movement behavior.

<style>
  .mdc-toolbar__row:first-child::after {
    background-image: url("../images/4-3-2.jpg");
    background-size: cover;
    background-position: center;
  }
</style>
<header class="mdc-toolbar mdc-toolbar--flexible mdc-toolbar--flexible-default-behavior">
  <div class="mdc-toolbar__row">
    ...
  </div>
</header>

Caveat: Complex animation performance

Due to the nature of having to listen for scroll events and mutate height, this may degrade performance in some mobile browsers. For example, combining high resolution images with parallax scrolling could lead to severe performance issues in certain mobile browsers. When implementing patterns like these for a mobile device, ensure that the image is as optimized as possible and carefully test the performance to make sure that it is adequate.

.mdc-toolbar__row:first-child::after {
  background-image: url("../images/4-3.jpg");
  background-size: cover;
  background-position: center;
}
@media (max-width: 599px) {
  background-image: url("../images/4-3-compressed.jpg");
  background-position: 0 0;
}

RTL Support

mdc-toolbar is automatically RTL-aware, and will re-position elements whenever it, or its ancestors, has a dir="rtl" attribute.

Classes

Block

The block class is mdc-toolbar. This defines the top-level toolbar element.

Element

The component accommodates multiple rows using the wrapper mdc-toolbar__row. For each row, it has mdc-toolbar__section and mdc-toolbar__title elements. You can add multiple sections to toolbar. Refer to Sections and Toolbar title for further details.

Modifier

The provided modifiers are:

Class	Description
mdc-toolbar--fixed	Makes toolbar fixed on top and have persistent elevation
mdc-toolbar--waterfall	Removes fixed toolbar persistent elevation and makes it to gain elevation when a user begins to scroll down the page
mdc-toolbar--fixed-lastrow-only	Makes only last row of fixed toolbar anchored on top
mdc-toolbar--flexible	Makes toolbar first row has flexible space
mdc-toolbar__section--align-start	Makes section aligns to the start.
mdc-toolbar__section--align-end	Makes section aligns to the end.
mdc-toolbar__section--shrink-to-fit	Makes section takes the width of its content.

JS Usage

Including in code

ES2015

import {MDCToolbar, MDCToolbarFoundation} from '@material/toolbar';

CommonJS

const mdcToolbar = require('@material/toolbar');
const MDCToolbar = mdcToolbar.MDCToolbar;
const MDCToolbarFoundation = mdcToolbar.MDCToolbarFoundation;

AMD

require(['/path/to/@material/toolbar'], mdcToolbar => {
  const MDCToolbar = mdcToolbar.MDCToolbar;
  const MDCToolbarFoundation = mdcToolbar.MDCToolbarFoundation;
});

Global

const MDCToolbar = mdc.toolbar.MDCToolbar;
const MDCToolbarFoundation = mdc.toolbar.MDCToolbarFoundation;

Automatic Instantiation

If you do not care about retaining the component instance for the toolbar, simply call attachTo() and pass it a DOM element.

mdc.toolbar.MDCToolbar.attachTo(document.querySelector('.mdc-toolbar'));

Manual Instantiation

import {MDCToolbar} from '@material/toolbar';

const toolbar = new MDCToolbar(document.querySelector('.mdc-toolbar'));

Using the MDCToolbar Foundation Class

API

Method Signature	Description
updateAdjustElementStyles() => void	sets AdjustElement proper margin-top.

Event

Event Name	Event Data Structure	Description
change	{flexibleExpansionRatio: number}	Emits the ratio of current flexible space to total flexible space height. So when it is minimized, ratio equals to 0 and when it is maximized, ratio equals to 1.

Adapter

Method Signature	Description
hasClass(className: string) => boolean	Checks if the root element of the component has the given className.
addClass(className: string) => void	Adds a class to the root element of the component.
removeClass(className: string) => void	Removes a class from the root element of the component.
registerScrollHandler(handler: Function) => void	Registers a handler to be called when user scrolls. Our default implementation adds the handler as a listener to the window's scroll event.
deregisterScrollHandler(handler: Function) => void	Unregisters a handler to be called when user scrolls. Our default implementation removes the handler as a listener to the window's scroll event.
registerResizeHandler(handler: Function) => void	Registers a handler to be called when the surface (or its viewport) resizes. Our default implementation adds the handler as a listener to the window's resize event.
deregisterResizeHandler(handler: Function) => void	Unregisters a handler to be called when the surface (or its viewport) resizes. Our default implementation removes the handler as a listener to the window's resize event.
getViewportWidth() => number	Gets viewport (window) width.
getViewportScrollY() => number	Gets the number of pixels that the content of body is scrolled upward.
getOffsetHeight() => number	Gets root element mdc-toolbar offsetHeight.
getFirstRowElementOffsetHeight() => number	Gets first row element offsetHeight.
notifyChange(evtData: {flexibleExpansionRatio: number}) => void	Broadcasts an event with the remaining ratio of flexible space.
setStyle(property: string, value: number) => void	Sets mdc-toolbar style property to provided value.
setStyleForTitleElement(property: string, value: number) => void	Sets mdc-toolbar__title style property to provided value.
setStyleForFlexibleRowElement(property: string, value: number) => void	Sets flexible row element style property to provided value.
setStyleForFixedAdjustElement(property: string, value: number) => void	Sets mdc-toolbar-fixed-adjust style property to provided value.