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🌌 preact-portal 🌠

NPM travis-ci

Render Preact components into SPACE*

* a space in the DOM. Sorry.

Use this if you have a component that needs to render children into some other place in the DOM.

An example of this would be modal dialogs, where you may need to render <Dialog /> into <body>.

Demo #1 Demo #2
Moving around the DOM by changing into. Open a full-page modal from within a thumbnail.

Installation

Via npm:

npm install --save preact-portal

Usage

import { h, Component, render } from 'preact';
import Portal from 'preact-portal';

class Thumbnail extends Component {
  open = () => this.setState({ open:true });
  close = () => this.setState({ open:false });

  render({ url }, { open }) {
    return (
      <div class="thumb" onClick={this.open}>
        <img src={url} />

        { open ? (
          <Portal into="body">
            <div class="popup" onClick={this.close}>
              <img src={url} />
            </div>
          </Portal>
        ) : null }
      </div>
    );
  }
}

render(<Thumbnail url="//i.imgur.com/6Rp4hbs.gif" />, document.body);

Or, wrap up a very common case into a simple high order function:

const Popup = ({ open, into="body", children }) => (
  open ? <Portal into={into}>{ children }</Portal> : null
);

// Example: show popup on error.
class Form extends Component {
  render({}, { error }) {
    return (
      <form>
        <Popup open={error}>
          <p>Error: {error}</p>
        </Popup>
        ...etc
      </form>
    );
  }
}