be-detail-oriented

Make the fieldset and possibly other built-in elements expandable, similar to the details element.

Syntax

<form>
    <fieldset be-detail-oriented>
        <legend>legend content</legend>
        <div>
            <label>test</label><input>
        </div>
    </fieldset>
</form>

Demo

Avoiding FOUC

If not using be-detail-oriented as a template instantiation element enhancement, to avoid FOUC, set the hidden attribute to elements inside reflecting the initial state:

<form>
    <fieldset be-detail-oriented>
        <legend>legend content</legend>
        <div hidden=until-found>
            <label>test</label><input>
        </div>
    </fieldset>
</form>

Note: Chrome (at least) seems to have unexpected behavior when it comes to setting hidden programmatically. In particular, not wrapping inputs and labels inside a div can prevent the hidden attribute from affecting the display, at least if it's set programmatically. This buggy (?) behavior can be observed in this demo.

Customizability

A number of configuration settings are is available to allow customizing how the enhancement goes about making itself expandable.

<form>
    <fieldset be-detail-oriented>
        <legend>legend content</legend>
        <div>
            <label>test</label><input>
        </div>
    </fieldset>
</form>

is shorthand for:

<form>
    <fieldset be-detail-oriented='{
        "summaryElSelector": "*"
    }'>
        <legend>legend content</legend>
        <div>
            <label>test</label><input>
        </div>
    </fieldset>
</form>

Meaning, by default, this enhancement selects the first child element it finds within, and appends the plus-minus web component to it, and hides the rest.

This web component relies on Declarative shadow DOM.

Viewing Locally

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

5. npm install

6. npm run serve

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

Importing in ES Modules:

import 'be-detail-oriented/be-detail-oriented.js';

Using from CDN:

<script type=module crossorigin=anonymous>
    import 'https://esm.run/be-detail-oriented';
</script>