Circular Progress

The MDC Circular Progress component is a spec-aligned circular progress indicator component adhering to the Material Design progress & activity requirements.

Design & API Documentation

Installation

npm install @loipham/material-circular-progress

Basic Usage

HTML Structure

<div class="mdc-circular-progress" style="width:48px;height:48px;" role="progressbar" aria-label="Example Progress Bar" aria-valuemin="0" aria-valuemax="1">
  <div class="mdc-circular-progress__determinate-container">
    <svg class="mdc-circular-progress__determinate-circle-graphic" viewBox="0 0 48 48" xmlns="http://www.w3.org/2000/svg">
      <circle class="mdc-circular-progress__determinate-track" cx="24" cy="24" r="18" stroke-width="4"/>
      <circle class="mdc-circular-progress__determinate-circle" cx="24" cy="24" r="18" stroke-dasharray="113.097" stroke-dashoffset="113.097" stroke-width="4"/>
    </svg>
  </div>
  <div class="mdc-circular-progress__indeterminate-container">
    <div class="mdc-circular-progress__spinner-layer">
      <div class="mdc-circular-progress__circle-clipper mdc-circular-progress__circle-left">
        <svg class="mdc-circular-progress__indeterminate-circle-graphic" viewBox="0 0 48 48" xmlns="http://www.w3.org/2000/svg">
          <circle cx="24" cy="24" r="18" stroke-dasharray="113.097" stroke-dashoffset="56.549" stroke-width="4"/>
        </svg>
      </div>
      <div class="mdc-circular-progress__gap-patch">
        <svg class="mdc-circular-progress__indeterminate-circle-graphic" viewBox="0 0 48 48" xmlns="http://www.w3.org/2000/svg">
          <circle cx="24" cy="24" r="18" stroke-dasharray="113.097" stroke-dashoffset="56.549" stroke-width="3.2"/>
        </svg>
      </div>
      <div class="mdc-circular-progress__circle-clipper mdc-circular-progress__circle-right">
        <svg class="mdc-circular-progress__indeterminate-circle-graphic" viewBox="0 0 48 48" xmlns="http://www.w3.org/2000/svg">
          <circle cx="24" cy="24" r="18" stroke-dasharray="113.097" stroke-dashoffset="56.549" stroke-width="4"/>
        </svg>
      </div>
    </div>
  </div>
</div>

Accessibility

Progress bars conform to the WAI-ARIA Progressbar Specification. The supported ARIA attributes for this progress bar are:

| Attribute | Description | | --------- | ----------- | | aria-label | Label indicating how the progress bar should be announced to the user. | | aria-valuemin | The minimum numeric value of the progress bar, which should always be 0. | | aria-valuemax | The maximum numeric value of the progress bar, which should always be 1. | | aria-valuenow | A numeric value between aria-valuemin and aria-valuemax indicating the progress value of the primary progress bar. This attribute is removed in indeterminate progress bars. |

Note that aria-label, aria-valuemin, and aria-valuemax are static and must be configured in the HTML. aria-valuenow is updated dynamically by the foundation when the progress value is updated in determinate progress bars.

Styles

@use "@loipham/material-circular-progress/mdc-circular-progress";

JavaScript Instantiation

import { MDCCircularProgress } from '@loipham/material-circular-progress';

const circularProgress = new MDCCircularProgress(document.querySelector('.mdc-circular-progress'));

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

Variants

Sizing

To set the stroke-width and container size strictly to one of three sizes defined by guidelines, replace the templates with the following.

Large (48px)

See baseline template above.

Medium (36px)

<div class="mdc-circular-progress" style="width:36px;height:36px;" role="progressbar" aria-label="Example Progress Bar" aria-valuemin="0" aria-valuemax="1">
  <div class="mdc-circular-progress__determinate-container">
    <svg class="mdc-circular-progress__determinate-circle-graphic" viewBox="0 0 32 32" xmlns="http://www.w3.org/2000/svg">
      <circle class="mdc-circular-progress__determinate-track" cx="16" cy="16" r="12.5" stroke-width="3"/>
      <circle class="mdc-circular-progress__determinate-circle" cx="16" cy="16" r="12.5" stroke-dasharray="78.54" stroke-dashoffset="78.54" stroke-width="3"/>
    </svg>
  </div>
  <div class="mdc-circular-progress__indeterminate-container">
    <div class="mdc-circular-progress__spinner-layer">
      <div class="mdc-circular-progress__circle-clipper mdc-circular-progress__circle-left">
        <svg class="mdc-circular-progress__indeterminate-circle-graphic" viewBox="0 0 32 32" xmlns="http://www.w3.org/2000/svg">
          <circle cx="16" cy="16" r="12.5" stroke-dasharray="78.54" stroke-dashoffset="39.27" stroke-width="3"/>
        </svg>
      </div>
      <div class="mdc-circular-progress__gap-patch">
        <svg class="mdc-circular-progress__indeterminate-circle-graphic" viewBox="0 0 32 32" xmlns="http://www.w3.org/2000/svg">
          <circle cx="16" cy="16" r="12.5" stroke-dasharray="78.54" stroke-dashoffset="39.27" stroke-width="2.4"/>
        </svg>
      </div>
      <div class="mdc-circular-progress__circle-clipper mdc-circular-progress__circle-right">
        <svg class="mdc-circular-progress__indeterminate-circle-graphic" viewBox="0 0 32 32" xmlns="http://www.w3.org/2000/svg">
          <circle cx="16" cy="16" r="12.5" stroke-dasharray="78.54" stroke-dashoffset="39.27" stroke-width="3"/>
        </svg>
      </div>
    </div>
  </div>
</div>

Small (24px)

<div class="mdc-circular-progress" style="width:24px;height:24px;" role="progressbar" aria-label="Example Progress Bar" aria-valuemin="0" aria-valuemax="1">
  <div class="mdc-circular-progress__determinate-container">
    <svg class="mdc-circular-progress__determinate-circle-graphic" viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg">
      <circle class="mdc-circular-progress__determinate-track" cx="12" cy="12" r="8.75" stroke-width="2.5"/>
      <circle class="mdc-circular-progress__determinate-circle" cx="12" cy="12" r="8.75" stroke-dasharray="54.978" stroke-dashoffset="54.978" stroke-width="2.5"/>
    </svg>
  </div>
  <div class="mdc-circular-progress__indeterminate-container">
    <div class="mdc-circular-progress__spinner-layer">
      <div class="mdc-circular-progress__circle-clipper mdc-circular-progress__circle-left">
        <svg class="mdc-circular-progress__indeterminate-circle-graphic" viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg">
          <circle cx="12" cy="12" r="8.75" stroke-dasharray="54.978" stroke-dashoffset="27.489" stroke-width="2.5"/>
        </svg>
      </div>
      <div class="mdc-circular-progress__gap-patch">
        <svg class="mdc-circular-progress__indeterminate-circle-graphic" viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg">
          <circle cx="12" cy="12" r="8.75" stroke-dasharray="54.978" stroke-dashoffset="27.489" stroke-width="2"/>
        </svg>
      </div>
      <div class="mdc-circular-progress__circle-clipper mdc-circular-progress__circle-right">
        <svg class="mdc-circular-progress__indeterminate-circle-graphic" viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg">
          <circle cx="12" cy="12" r="8.75" stroke-dasharray="54.978" stroke-dashoffset="27.489" stroke-width="2.5"/>
        </svg>
      </div>
    </div>
  </div>
</div>

Four-Colored

You may choose to have the indicator in inderminate state animate through 4 colors. The template for the four-colored indicator is like that of the baseline, except the spinner layer is replicated 4 times, 1 for each color. See Sass-Mixins for how to customize the four colors. This is done instead of animating the color property to reduce browser repaints.

<div class="mdc-circular-progress" style="width:48px;height:48px;" role="progressbar" aria-label="Example Progress Bar" aria-valuemin="0" aria-valuemax="1">
  <div class="mdc-circular-progress__determinate-container">
    <svg class="mdc-circular-progress__determinate-circle-graphic" viewBox="0 0 48 48" xmlns="http://www.w3.org/2000/svg">
      <circle class="mdc-circular-progress__determinate-track" cx="24" cy="24" r="18" stroke-width="4"/>
      <circle class="mdc-circular-progress__determinate-circle" cx="24" cy="24" r="18" stroke-dasharray="113.097" stroke-dashoffset="113.097" stroke-width="4"/>
    </svg>
  </div>
  <div class="mdc-circular-progress__indeterminate-container">
    <div class="mdc-circular-progress__spinner-layer mdc-circular-progress__color-1">
      <div class="mdc-circular-progress__circle-clipper mdc-circular-progress__circle-left">
        <svg class="mdc-circular-progress__indeterminate-circle-graphic" viewBox="0 0 48 48" xmlns="http://www.w3.org/2000/svg">
          <circle cx="24" cy="24" r="18" stroke-dasharray="113.097" stroke-dashoffset="56.549" stroke-width="4"/>
        </svg>
      </div>
      <div class="mdc-circular-progress__gap-patch">
        <svg class="mdc-circular-progress__indeterminate-circle-graphic" viewBox="0 0 48 48" xmlns="http://www.w3.org/2000/svg">
          <circle cx="24" cy="24" r="18" stroke-dasharray="113.097" stroke-dashoffset="56.549" stroke-width="3.8"/>
        </svg>
      </div>
      <div class="mdc-circular-progress__circle-clipper mdc-circular-progress__circle-right">
        <svg class="mdc-circular-progress__indeterminate-circle-graphic" viewBox="0 0 48 48" xmlns="http://www.w3.org/2000/svg">
          <circle cx="24" cy="24" r="18" stroke-dasharray="113.097" stroke-dashoffset="56.549" stroke-width="4"/>
        </svg>
      </div>
    </div>

    <div class="mdc-circular-progress__spinner-layer mdc-circular-progress__color-2">
      <!-- Same as above -->
    </div>

    <div class="mdc-circular-progress__spinner-layer mdc-circular-progress__color-3">
      <!-- Same as above -->
    </div>

    <div class="mdc-circular-progress__spinner-layer mdc-circular-progress__color-4">
      <!-- Same as above -->
    </div>
  </div>
</div>

Style Customization

CSS Classes

CSS Class | Description --------- | ------------- mdc-circular-progress | Mandatory. The root element. mdc-circular-progress--indeterminate | Optional. Puts the circular progress indicator in an indeterminate state. | mdc-circular-progress--closed | Optional. Hides the circular progress indicator. | mdc-circular-progress__determinate-container | Mandatory. Contains the determinate progress indicator. mdc-circular-progress__indeterminate-container | Mandatory. Contains the indeterminate progress indicator. mdc-circular-progress__determinate-circle-graphic | Mandatory. The determinate SVG. mdc-circular-progress__determinate-track | Mandatory. The determinate SVG track. mdc-circular-progress__determinate-circle | Mandatory. The determinate SVG circle. mdc-circular-progress__spinner-layer | Mandatory. Another wrapper around the indeterminate indicator. mdc-circular-progress__indeterminate-circle-graphic | Mandatory. An indeterminate SVG (there are three of these in total). mdc-circular-progress__circle-clipper | Mandatory. Clips an indeterminate SVG circle so that only a section of it is visible. mdc-circular-progress__circle-left | Mandatory. One of two circle sections that when combined are animated to form the full indeterminate progress indicator. mdc-circular-progress__circle-right | Mandatory. One of two circle sections that when combined are animated to form the full indeterminate progress indicator. mdc-circular-progress__gap-patch | Mandatory. A tiny little sliver of an SVG circle used to patch a gap between the circle-left and the circle-right.

NOTE: Ensure the correct inner SVG templates for each size are used to ensure optimal ratio of the stroke width to container size as specified in Material Design guidelines.

Sass Mixins

Mixin | Description ----- | ------------ color($color) | Customizes the stroke-color of the indicator. Applies to the determinate variant, and also the indeterminate variant unless the four-color mixin is applied. track-color($color) | Customizes the track color of the indicator. Applies to the determinate variant only. indeterminate-colors($colors) | Applies four animated stroke-colors to the indeterminate indicator. Applicable to the indeterminate variant only and overrides any single color currently set. Takes a list of exacty four colors.

MDCCircularProgress Properties and Methods

Property | Value Type | Description -------- | ---------- | -------------- determinate | boolean (write-only) | Toggles the component between the determinate and indeterminate state. progress | number (write-only) | Sets the progress bar to this value. Value should be between 0 and 1.

Method Signature | Description | ---------------- | ----------- | open() => void | Puts the component in the open state. | close() => void | Puts the component in the closed state. |

Usage within Web Frameworks

MDCCircularProgressAdapter

Method Signature | Description ---------------- | ----------- addClass(className: string) => void | Adds a class to the root element. getDeterminateCircleAttribute(attributeName: string) => void | Gets the specified attribute from the determinate circle element. hasClass(className: string) => boolean | Returns boolean indicating whether the root element has a given class. removeClass(className: string) => void | Removes a class from the root element. removeAttribute(attributeName: string) => void | Removes the specified attribute from the root element. setAttribute(attributeName: string, value: string) => void | Sets the specified attribute on the root element. setDeterminateCircleAttribute(attributeName: string, value: string) => void | Sets the specified attribute on the determinate circle element.

MDCCircularProgressFoundation

Method Signature | Description ---------------- | --- setDeterminate(value: boolean) => void | Toggles the component between the determinate and indeterminate state. isDeterminate() => boolean | Whether or not the component is in determinate state. setProgress(value: number) => void | Sets the progress bar to this value. Value should be between [0, 1]. getProgress() => number | The current progress value in the interval [0,1]. open() => void | Puts the component in the open state. close() => void | Puts the component in the closed state. isClosed() => boolean | Whether or not the progress indicator is closed.