@anypoint-web-components/anypoint-selector

Port of iron-selector that works with ES6 classes. Manages a list of elements that can be selected.

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Published on NPM
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Published on webcomponents.org
anypoint-selector
This is a port of iron-selector that works with LitElement and ES6 classes, originally developed by Polymer team.

<anypoint-selector>, AnypointSelectableMixin, AnypointMultiSelectableMixin

anypoint-selector is an element which can be used to manage a list of elements that can be selected. Tapping on the item will make the item selected. The selected indicates which item is being selected. The default is to use the index of the item. anypoint-selector's functionality is entirely defined by AnypointMultiSelectableMixin.
AnypointSelectableMixin gives an element the concept of a selected child element. By default, the element will select one of its selectable children when a click event is dispatched to it.
AnypointSelectableMixin lets you ...
  • decide which children should be considered selectable (selectable),
  • retrieve the currently selected element (selectedItem) and all elements
in the selectable set (`items`),
  • change the selection (select, selectNext, etc.),
  • decide how selected elements are modified to indicate their selected state (selectedClass, selectedAttribute),

... among other things.
AnypointMultiSelectableMixin includes all the features of AnypointSelectableMixin as well as a multi property, which can be set to true to indicate that the element can have multiple selected child elements. It also includes the selectedItems and selectedValues properties for working with arrays of selectable elements and their corresponding values (multi is true) - similar to the single-item versions provided by AnypointSelectableMixin: selectedItem and selected.
The element has no own shadow DOM. Items are rendered as is. The element also covers a case where the selector is used in another custom element and a <slot> is passed as a child (e.g. dropdown list wit children defined in light DOM).

Usage

Installation

npm install --save @anypoint-web-components/anypoint-selector

In an html file

<html>
  <head>
    <script type="module">
      import '@anypoint-web-components/anypoint-selector/anypoint-selector.js';
    </script>
  </head>
  <body>
    <anypoint-selector selected="0">
      <div>Item 0</div>
      <div>Item 1</div>
      <div>Item 2</div>
      <div>Item 3</div>
      <div>Item 4</div>
    </anypoint-selector>
    <script>
    {
      document.querySelector('files-payload-editor').onselect = (e) => {
        console.log(e.detail.value);
      };
    }
    </script>
  </body>
</html>

In a LitElement template

import { LitElement, html } from 'lit-element';
import '@anypoint-web-components/anypoint-selector/anypoint-selector.js';

class SampleElement extends LitElement {
  render() {
    return html`
    <anypoint-selector @select="${this._selectedHandler}"></anypoint-selector>
    `;
  }

  _selectedHandler(e) {
    console.log('current selection:', e.detail.item);
  }
}
customElements.define('sample-element', SampleElement);

Development

git clone https://github.com/anypoint-web-components/anypoint-selector
cd anypoint-selector
npm install

Running the demo locally

npm start

Running the tests

npm test