k-fetch is a small, bare-bones simple fetch web component. For more features (but larger footprint), see xtal-fetch.

k-fetch can act as a base web component. be-kvetching and be-fetching [TODO] actually can dynamically create such a web component on the fly, declaratively, that extends this base class.

Markup:

<k-fetch 
href=https://cors-anywhere.herokuapp.com/https://www.theonion.com/ 
as=html shadow=open credentials=omit onerror="console.error(href)"></k-fetch>
    

Required attributes are href and onerror. The onerror attribute is required to "opt-in", since the attribute can't pass through any decent sanitizer that prevents xss attacks.

If as=json, a custom event, "fetch-complete" is fired, with the data in the detail. The data is also stored in the "value" field of k-fetch. Also, event "change" is fired.

If as=html, the response is inserted into the innerHTML of the k-fetch element, unless attribute shadow is present, in which case it will first create a shadowRoot, then insert the innerHTML.

k-fetch has no support for "href" or "as" properties, only attributes.

k-fetch caches get's based on the localName of the custom element as the base key of the cache.

<k-fetch 
    href=https://newton.now.sh/api/v2/integrate/x^2 
    target=json-viewer[-object]
    onerror=console.error(href)
>
</k-fetch>
...
<json-viewer -object></json-viewer>

k-fetch will set aria-busy to true while fetch is in progress, and also set aria-live=polite if no aria-live value is found.

Any web server that can serve static files will do, but...

1. Install git.
2. Fork/clone this repo.
3. Install node.js.
4. Open command window to folder where you cloned this repo.

5. npm install

6. npm run serve

7. Open http://localhost:3030/demo/ in a modern browser.

import 'k-fetch/k-fetch.js';

<script type=module crossorigin=anonymous>
    import 'https://esm.run/k-fetch';
</script>