nette / forms / 28116153640

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FormNode: {form detached name} for layouts that nest other forms

HTML forbids nested <form> tags, so a layout embedding a component that
renders its own <form> can't wrap its controls in another <form>. The
detached keyword emits an empty <form>...</form> at the opening position
and links every control back to it via the HTML5 form= attribute
(applied in Runtime::item()), so inputs submit correctly wherever they
sit in the DOM. Controls in nested containers and {form scope} inherit
the same link.

Unlike {form scope}/{formContext}, detached does render a <form>, so it
still accepts arguments, which apply to that tag.

Throws InvalidStateException when detached is used with a non-Form
Container or a form without an id.

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