# @polymer/iron-checked-element-behavior

> Implements an element that has a checked attribute and can be added to a form

Latest version **3.0.1** (published 2018-09-14) · BSD-3-Clause license · 0 weekly downloads

## Install

```sh
npm install @polymer/iron-checked-element-behavior
pnpm add @polymer/iron-checked-element-behavior
yarn add @polymer/iron-checked-element-behavior
bun add @polymer/iron-checked-element-behavior
```

## Health

**Score 15/100 (F)** — status: abandoned.

Positive: no vulnerabilities.

Warnings: low downloads; no types; no esm support.

Negative: abandoned; low maintenance score.

## Facts

| | |
|---|---|
| Version | 3.0.1 |
| Published | 2018-09-14 |
| First published | 2016-02-02 |
| Weekly downloads | 0 |
| License | BSD-3-Clause |
| TypeScript types | none |
| Module format | CommonJS |
| Dependencies | 3 |
| Unpacked size | 16.1 KB |
| Known vulnerabilities | 0 |
| Install scripts | no |
| GitHub stars | 5 |
| Maintainers | aomarks, azakus, bicknellr, emarquez, justinfagnani, keanulee, notwaldorf, polymer-devs, samli, sorvell, usergenic |
| Keywords | web-components, polymer, iron, behavior |

## Links

- npm: https://www.npmjs.com/package/@polymer/iron-checked-element-behavior
- Repository: https://github.com/PolymerElements/iron-checked-element-behavior
- Issues: https://github.com/PolymerElements/iron-checked-element-behavior/issues
- npm.io page: https://npm.io/package/@polymer/iron-checked-element-behavior

## Dependencies (3)

- [@polymer/polymer](https://npm.io/package/@polymer/polymer.md) ^3.0.0
- [@polymer/iron-validatable-behavior](https://npm.io/package/@polymer/iron-validatable-behavior.md) ^3.0.0-pre.26
- [@polymer/iron-form-element-behavior](https://npm.io/package/@polymer/iron-form-element-behavior.md) ^3.0.0-pre.26

## Alternatives

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## Recent versions

- 3.0.1 (latest) — 2018-09-14
- 3.0.0-pre.20 (next) — 2018-06-23
- 1.0.5-pre.3 (preview) — 2017-01-24
- 3.0.0 — 2018-09-13
- 3.0.0-pre.26 — 2018-09-12
- 3.0.0-pre.25 — 2018-08-29
- 3.0.0-pre.24 — 2018-08-29
- 3.0.0-pre.23 — 2018-08-25
- 3.0.0-pre.22 — 2018-08-25
- 3.0.0-pre.21 — 2018-06-23
- 3.0.0-pre.19 — 2018-05-09
- 3.0.0-pre.18 — 2018-05-09
- 3.0.0-pre.17 — 2018-05-08
- 3.0.0-pre.16 — 2018-05-04
- 3.0.0-pre.15 — 2018-05-02
- … 17 more at https://npm.io/package/@polymer/iron-checked-element-behavior/versions

## README

[![Published on NPM](https://img.shields.io/npm/v/@polymer/iron-checked-element-behavior.svg)](https://www.npmjs.com/package/@polymer/iron-checked-element-behavior)
[![Build status](https://travis-ci.org/PolymerElements/iron-checked-element-behavior.svg?branch=master)](https://travis-ci.org/PolymerElements/iron-checked-element-behavior)
[![Published on webcomponents.org](https://img.shields.io/badge/webcomponents.org-published-blue.svg)](https://webcomponents.org/element/@polymer/iron-checked-element-behavior)

## IronCheckedElementBehavior

Use `IronCheckedElementBehavior` to implement a custom element that has a
`checked` property, which can be used for validation if the element is also
`required`. Element instances implementing this behavior will also be
registered for use in an `iron-form` element.

See: [Documentation](https://www.webcomponents.org/element/@polymer/iron-checked-element-behavior),
 [Demo](https://www.webcomponents.org/element/@polymer/iron-checked-element-behavior/demo/demo/index.html).

## Usage

### Installation

```
npm install --save @polymer/iron-checked-element-behavior
```

### In a Polymer 3 element

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

import {IronCheckedElementBehavior} from '../iron-checked-element-behavior.js';

class SimpleCheckbox extends mixinBehaviors(IronCheckedElementBehavior, PolymerElement) {
  static get template() {
    return html`
      <style>
        :host([invalid]) {
          color: red;
        }
      </style>

      <button on-click="_checkValidity">validate</button>
      <input type="checkbox" id="checkbox" checked="{{checked::input}}">
      <span id="labelText">{{label}}</span>
    `;
  }

  static get properties() {
    return {label: {type: String, value: 'not validated'}};
  }

  _checkValidity() {
    this.validate();
    this.label = this.invalid ? 'is invalid' : 'is valid';
  }
}

customElements.define('simple-checkbox', SimpleCheckbox);
```

## Contributing

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

### Installation

```sh
git clone https://github.com/PolymerElements/iron-checked-element-behavior
cd iron-checked-element-behavior
npm install
npm install -g polymer-cli
```

### Running the demo locally

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

### Running the tests

```sh
polymer test --npm
```

---
_Source: https://npm.io/package/@polymer/iron-checked-element-behavior · Machine-readable twin of the npm.io package page. Health data is recomputed on every publish._