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<!--
@license
Copyright (c) 2015 The Polymer Project Authors. All rights reserved.
This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
Code distributed by Google as part of the polymer project is also
subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
-->
<link rel="import" href="../polymer/polymer.html">
<link rel="import" href="../iron-validatable-behavior/iron-validatable-behavior.html">
<link rel="import" href="../iron-form-element-behavior/iron-form-element-behavior.html">
<script>
/**
* Use `Polymer.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.
*
* @demo demo/index.html
* @polymerBehavior Polymer.IronCheckedElementBehavior
*/
Polymer.IronCheckedElementBehaviorImpl = {
properties: {
/**
* Fired when the checked state changes.
*
* @event iron-change
*/
/**
* Gets or sets the state, `true` is checked and `false` is unchecked.
*/
checked: {
type: Boolean,
value: false,
reflectToAttribute: true,
notify: true,
observer: '_checkedChanged'
},
/**
* If true, the button toggles the active state with each tap or press
* of the spacebar.
*/
toggles: {
type: Boolean,
value: true,
reflectToAttribute: true
},
/* Overriden from Polymer.IronFormElementBehavior */
value: {
type: String,
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value: 'on',
observer: '_valueChanged'
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}
},
observers: [
'_requiredChanged(required)'
],
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created: function() {
// Used by `iron-form` to handle the case that an element with this behavior
// doesn't have a role of 'checkbox' or 'radio', but should still only be
// included when the form is serialized if `this.checked === true`.
this._hasIronCheckedElementBehavior = true;
},
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/**
* Returns false if the element is required and not checked, and true otherwise.
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* @param {*=} _value Ignored.
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* @return {boolean} true if `required` is false, or if `required` and `checked` are both true.
*/
_getValidity: function(_value) {
return this.disabled || !this.required || (this.required && this.checked);
},
/**
* Update the aria-required label when `required` is changed.
*/
_requiredChanged: function() {
if (this.required) {
this.setAttribute('aria-required', 'true');
} else {
this.removeAttribute('aria-required');
}
},
/**
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* Fire `iron-changed` when the checked state changes.
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*/
_checkedChanged: function() {
this.active = this.checked;
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this.fire('iron-change');
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},
/**
* Reset value to 'on' if it is set to `undefined`.
*/
_valueChanged: function() {
if (this.value === undefined || this.value === null) {
this.value = 'on';
}
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}
};
/** @polymerBehavior Polymer.IronCheckedElementBehavior */
Polymer.IronCheckedElementBehavior = [
Polymer.IronFormElementBehavior,
Polymer.IronValidatableBehavior,
Polymer.IronCheckedElementBehaviorImpl
];
</script>
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