On this page Loading Indicator Loading Indicator

The m3e-loading-indicator component shows indeterminate progress for a short wait time. It uses animation to grab attention, mitigate perceived latency, and indicate that an activity is in progress. 

import "@m3e/web/loading-indicator";
 Usage

This section outlines usage examples and configuration guidance for the components in this package.

Variants

There are two loading indicator appearance variants: uncontained (default) and contained. Use the variant attribute to change the appearance. 

<m3e-loading-indicator></m3e-loading-indicator>
<m3e-loading-indicator variant="contained"></m3e-loading-indicator>
 Accessibility

The m3e-loading-indicator implements the ARIA role="progressbar" pattern. By default, the component sets aria-valuemin to 0 and aria-valuemax to 100.

Always provide an accessible label via aria-label or aria-labelledby for each loading indicator.

Native module support

The @m3e/web package uses JavaScript Modules. To use it directly in a browser without a bundler, use a module script similar to the following. 

<script type="module" src="/node_modules/@m3e/web/dist/loading-indicator.js"></script>

In addition, you must use an import map to include dependencies. 

<script type="importmap">
  {
    "imports": {
      "tslib": "https://cdn.jsdelivr.net/npm/tslib@2.8.1/+esm",
      "lit": "https://cdn.jsdelivr.net/npm/lit@3.3.0/+esm",
      "lit/": "https://cdn.jsdelivr.net/npm/lit@3.3.0/",
      "lit-html": "https://cdn.jsdelivr.net/npm/lit-html@3.3.0/+esm",
      "lit-html/directive.js": "https://cdn.jsdelivr.net/npm/lit-html@3.3.0/directive.js",
      "lit-html/directives/if-defined.js": "https://cdn.jsdelivr.net/npm/lit-html@3.3.0/directives/if-defined.js",
      "lit-html/directives/class-map.js": "https://cdn.jsdelivr.net/npm/lit-html@3.3.0/directives/class-map.js",
      "@lit/reactive-element": "https://cdn.jsdelivr.net/npm/@lit/reactive-element@2.0.4/+esm",
      "@lit/reactive-element/": "https://cdn.jsdelivr.net/npm/@lit/reactive-element@2.0.4/",
      "@m3e/web/core": "/node_modules/@m3e/web/dist/core.js"
    }
  }
</script>

For production builds, use the minified files to ensure optimal load performance.

API

The @m3e/web package includes a Custom Elements Manifest (custom-elements.json), which documents the properties, attributes, slots, events and CSS custom properties of each component.

You can explore the API below, or integrate the manifest into your own tooling.