@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,
Demo.

Usage

$3

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

$3

`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

validate

{{label}}
;
}

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:

$3

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

$3

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

$3

`sh
polymer test --npm
``