/iron-meta

Element for creating and accessing self-organizing meta-databases

Primary LanguageHTML

Published on NPM Build status Published on webcomponents.org

<iron-meta>

iron-meta is a generic element you can use for sharing information across the DOM tree.

See: Documentation, Demo.

Usage

Installation

npm install --save @polymer/iron-meta

In an HTML file

<html>
  <head>
    <script type="module">
      import '@polymer/iron-meta/iron-meta.js';
    </script>
  </head>
  <body>
    <iron-meta key="info" value="foo"></iron-meta>
    <!-- Other elements reading from the key 'info' see the value 'foo'. -->
  </body>
</html>

In a Polymer 3 element

import {PolymerElement} from '@polymer/polymer/polymer-element.js';
import {html} from '@polymer/polymer/lib/utils/html-tag.js';

import '@polymer/iron-meta/iron-meta.js';

class ExampleElement extends PolymerElement {
  static get properties() {
    return {
      prop: String,
    };
  }

  static get template() {
    return html`
      <iron-meta key="info" value="{{prop}}"></iron-meta>
      info: [[prop]]
    `;
  }
}

customElements.define('example-element', ExampleElement);

Contributing

If you want to send a PR to this element, here are the instructions for running the tests and demo locally:

Installation

git clone https://github.com/PolymerElements/iron-meta
cd iron-meta
npm install
npm install -g polymer-cli

Running the demo locally

polymer serve --npm
open http://127.0.0.1:<port>/demo/

Running the tests

polymer test --npm