@limetech/mdc-button

v4.0.1-p4.0.0.1

Published

3 years ago

The Material Components for the web button component

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material components material design button

Buttons

Buttons allow users to take actions, and make choices, with a single tap.

Design & API Documentation

Installation

npm install @limetech/mdc-button

Basic Usage

HTML Structure

<button class="mdc-button">
  <div class="mdc-button__ripple"></div>
  <span class="mdc-button__label">Button</span>
</button>

NOTE: Examples here use the generic <button>, but users can also apply the mdc-button class to <a> elements.

Styles

@import "@limetech/mdc-button/mdc-button";

JavaScript Instantiation

The button will work without JavaScript, but you can enhance it to have a ripple effect by instantiating MDCRipple on the root element. See MDC Ripple for details.

import {MDCRipple} from '@limetech/mdc-ripple';

const buttonRipple = new MDCRipple(document.querySelector('.mdc-button'));

See Importing the JS component for more information on how to import JavaScript.

Variants

Contained Button

To style a contained button, add the mdc-button--raised class to the <button> element for a contained button with elevation, or the mdc-button--unelevated class for a contained button flush with the surface.

Outlined Button

To style an outlined button, add the class mdc-button--outlined to the <button> element.

Icons

We recommend using Material Icons from Google Fonts:

<head>
  <link rel="stylesheet" href="https://fonts.googleapis.com/icon?family=Material+Icons">
</head>

However, you can also use SVG, Font Awesome, or any other icon library you wish.

To add an icon, add an element with the mdc-button__icon class inside the button element and set the attribute aria-hidden="true". The icon is set to 1.125rem to meet legibility requirements.

<button class="mdc-button">
  <div class="mdc-button__ripple"></div>
  <i class="material-icons mdc-button__icon" aria-hidden="true">favorite</i>
  <span class="mdc-button__label">Button</span>
</button>

It's also possible to use an SVG icon:

<button class="mdc-button">
  <div class="mdc-button__ripple"></div>
  <svg class="mdc-button__icon" aria-hidden="true" xmlns="http://www.w3.org/2000/svg" viewBox="...">
  ...
  </svg>
  <span class="mdc-button__label">Button</span>
</button>

Trailing Icon

Certain icons make more sense to appear after the button's text label rather than before. This can be accomplished by putting the icon markup after the mdc-button__label element.

<button class="mdc-button">
  <div class="mdc-button__ripple"></div>
  <span class="mdc-button__label">Button</span>
  <i class="material-icons mdc-button__icon" aria-hidden="true">favorite</i>
</button>

NOTE: The mdc-button__label element is required in order for the trailing icon to be styled appropriately.

Disabled

To disable a button, add the disabled attribute directly to the <button>, or set the disabled attribute on the <fieldset> containing the button. Disabled buttons cannot be interacted with and have no visual interaction effect.

<button class="mdc-button" disabled>
  <div class="mdc-button__ripple"></div>
  <span class="mdc-button__label">Button</span>
</button>

Additional Information

Accessibility

Material Design spec advises that touch targets should be at least 48 x 48 px. To meet this requirement, add the following to your button:

<div class="mdc-touch-target-wrapper">
  <button class="mdc-button mdc-button--touch">
    <div class="mdc-button__ripple"></div>
    <span class="mdc-button__label">My Accessible Button</span>
    <div class="mdc-button__touch"></div>
  </button>
</div>

Note that the outer mdc-touch-target-wrapper element is only necessary if you want to avoid potentially overlapping touch targets on adjacent elements (due to collapsing margins).

Style Customization

CSS Classes

CSS Class | Description --- | --- mdc-button | Mandatory. Defaults to a text button that is flush with the surface. mdc-button__ripple | Mandatory. Indicates the element which shows the ripple styling. mdc-button--raised | Optional. Styles a contained button that is elevated above the surface. mdc-button--unelevated | Optional. Styles a contained button that is flush with the surface. mdc-button--outlined | Optional. Styles an outlined button that is flush with the surface. mdc-button__label | Recommended.* Indicates the element containing the button's text label. mdc-button__icon | Optional. Indicates the element containing the button's icon.

*NOTE: The mdc-button__label element is required for buttons with a trailing icon, but it is currently optional for buttons with no icon or a leading icon. In the latter cases, it is acceptable for the text label to simply exist directly within the mdc-button element. However, the mdc-button__label class may become mandatory for all cases in the future, so it is recommended to always include it to be future-proof.

Sass Mixins

To customize a button's color and properties, you can use the following mixins.

Basic Sass Mixins

MDC Button uses MDC Theme's primary color by default. Use the following mixins to customize it.

Mixin | Description --- | --- mdc-button-filled-accessible($container-fill-color) | Sets the container fill color for a contained (raised or unelevated) button, and updates the button's ink, icon, and ripple colors to meet accessibility standards

Advanced Sass Mixins

These mixins will override the color of the container, ink, outline or ripple. It is up to you to ensure your button meets accessibility standards.

Mixin | Description --- | --- mdc-button-container-fill-color($color) | Sets the container fill color to the given color. mdc-button-icon-color($color) | Sets the icon color to the given color. mdc-button-ink-color($color) | Sets the ink color to the given color, and sets the icon color to the given color unless mdc-button-icon-color is also used. mdc-button-density($density-scale) | Sets density scale for button. Supported density scale values (-3, -2, -1, 0). mdc-button-height($height) | Sets custom height of button. mdc-button-shape-radius($radius, $density-scale, $rtl-reflexive) | Sets rounded shape to button with given radius size. $density-scale is only required when $radius value is in percentage unit, defaults to $mdc-button-density-default-scale. Set $rtl-reflexive to true to flip radius values in RTL context, defaults to false. mdc-button-horizontal-padding($padding) | Sets horizontal padding to the given number. mdc-button-outline-color($color) | Sets the outline color to the given color. mdc-button-outline-width($width, $padding) | Sets the outline width to the given number (defaults to 0.125rem) and adjusts padding accordingly. $padding is only required in cases where mdc-button-horizontal-padding is also included with a custom value.

Caveat: Edge and CSS Custom Properties

In browsers that fully support CSS custom properties, the above mixins will work if you pass in a MDC Theme property (e.g. primary) as an argument. However, Edge does not fully support CSS custom properties. If you are using the mdc-button-container-fill-color mixin, you must pass in an actual color value for support in Edge.