Include

<sl-include> | SlInclude

Since 2.0

stable

Includes give you the power to embed external HTML files into the page.

Included files are asynchronously requested using window.fetch(). Requests are cached, so the same file can be included multiple times, but only one request will be made.

The included content will be inserted into the <sl-include> element’s default slot so it can be easily accessed and styled through the light DOM.

<sl-include src="https://shoelace.style/assets/examples/include.html"></sl-include>

import SlInclude from '@shoelace-style/shoelace/dist/react/include';

const App = () => <SlInclude src="https://shoelace.style/assets/examples/include.html" />;

Examples

Listening for Events

When an include file loads successfully, the sl-load event will be emitted. You can listen for this event to add custom loading logic to your includes.

If the request fails, the sl-error event will be emitted. In this case, event.detail.status will contain the resulting HTTP status code of the request, e.g. 404 (not found).

<sl-include src="https://shoelace.style/assets/examples/include.html"></sl-include>

<script>
  const include = document.querySelector('sl-include');

  include.addEventListener('sl-load', event => {
    if (event.eventPhase === Event.AT_TARGET) {
      console.log('Success');
    }
  });

  include.addEventListener('sl-error', event => {
    if (event.eventPhase === Event.AT_TARGET) {
      console.log('Error', event.detail.status);
    }
  });
</script>

Importing

If you’re using the autoloader or the traditional loader, you can ignore this section. Otherwise, feel free to use any of the following snippets to cherry pick this component.

Script

Import

Bundler

React

To import this component from the CDN using a script tag:

<script type="module" src="https://cdn.jsdelivr.net/npm/@shoelace-style/shoelace@2.8.0/cdn/components/include/include.js"></script>

To import this component from the CDN using a JavaScript import:

import 'https://cdn.jsdelivr.net/npm/@shoelace-style/shoelace@2.8.0/cdn/components/include/include.js';

To import this component using a bundler:

import '@shoelace-style/shoelace/dist/components/include/include.js';

To import this component as a React component:

import SlInclude from '@shoelace-style/shoelace/dist/react/include';

Properties

Name	Description	Type	Default
`src`	The location of the HTML file to include. Be sure you trust the content you are including as it will be executed as code and can result in XSS attacks.	`string`	-
`mode`	The fetch mode to use.	`'cors' \| 'no-cors' \| 'same-origin'`	`'cors'`
`allowScripts` `allow-scripts`	Allows included scripts to be executed. Be sure you trust the content you are including as it will be executed as code and can result in XSS attacks.	`boolean`	`false`
`updateComplete`	A read-only promise that resolves when the component has finished updating.

Learn more about attributes and properties.

Events

Name	React Event	Description	Event Detail
`sl-load`	`onSlLoad`	Emitted when the included file is loaded.	-
`sl-error`	`onSlError`	Emitted when the included file fails to load due to an error.	`{ status: number }`

Learn more about events.