Progress Indicator: Examples

Styled progress bar example

Add custom styles and more features by extending the LionProgressIndicator.

export class MyDeterminateProgressBar extends LionProgressIndicator {
  static get styles() {
    return [
      css`
        :host {
          display: block;
          position: relative;
          width: 100%;
          height: 6px;
          overflow: hidden;
          background-color: #eee;
        }

        .progress__filled {
          height: inherit;
          background-color: green;
          border-radius: inherit;
        }
      `,
    ];
  }

  _graphicTemplate() {
    return html`
      <div class="progress__filled" style="width: \${this._progressPercentage}%"></div>
    `;
  }
}

By given the progress-indicator a value it becomes determinate. The min is automatically set to "0" and max to "100", but they can be set to your local needs.

export const progressBarDemo = () => html`
  <my-determinate-progress-bar
    aria-label="Interest rate"
    name="my-bar"
    value="50"
  ></my-determinate-progress-bar>
  <button @click="${changeProgress}">Randomize Value</button>
`;

Styled progress spinner example

LionProgressIndicator is designed to be extended to add visuals. Implement the _graphicTemplate() method to set the rendered content and apply styles normally.

class MyIndeterminateProgressSpinner extends LionProgressIndicator {
  static get styles() {
    return [
      css`
        .progress__icon {
          display: inline-block;
          width: 48px;
          height: 48px;
          animation: spinner-rotate 2s linear infinite;
        }

        .progress__filled {
          animation: spinner-dash 1.35s ease-in-out infinite;
          fill: none;
          stroke-width: 6px;
          stroke: var(--primary-color);
        }

        @keyframes spinner-rotate {
          to {
            transform: rotate(360deg);
          }
        }

        @keyframes spinner-dash {
          0% {
            stroke-dasharray: 6, 122;
            stroke-dashoffset: 0;
          }
          50% {
            stroke-dasharray: 100, 28;
            stroke-dashoffset: -16;
          }
          100% {
            stroke-dasharray: 6, 122;
            stroke-dashoffset: -127;
          }
        }
      `,
    ];
  }

  _graphicTemplate() {
    return html`
      <svg class="progress__icon" viewBox="20 20 47 47">
        <circle class="progress__filled" cx="44" cy="44" r="20.2" />
      </svg>
    `;
  }
}

export const main = () => html`
  <my-indeterminate-progress-spinner></my-indeterminate-progress-spinner>
`;