paper-radio-group.html
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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-a11y-keys-behavior/iron-a11y-keys-behavior.html">
<link rel="import" href="../iron-selector/iron-selectable.html">
<link rel="import" href="../paper-radio-button/paper-radio-button.html">
<!--
Material design: [Radio button](https://www.google.com/design/spec/components/selection-controls.html#selection-controls-radio-button)
`paper-radio-group` allows user to select at most one radio button from a set.
Checking one radio button that belongs to a radio group unchecks any
previously checked radio button within the same group. Use
`selected` to get or set the selected radio button.
The <paper-radio-buttons> inside the group must have the `name` attribute
set.
Example:
<paper-radio-group selected="small">
<paper-radio-button name="small">Small</paper-radio-button>
<paper-radio-button name="medium">Medium</paper-radio-button>
<paper-radio-button name="large">Large</paper-radio-button>
</paper-radio-group>
Radio-button-groups can be made optional, and allow zero buttons to be selected:
<paper-radio-group selected="small" allow-empty-selection>
<paper-radio-button name="small">Small</paper-radio-button>
<paper-radio-button name="medium">Medium</paper-radio-button>
<paper-radio-button name="large">Large</paper-radio-button>
</paper-radio-group>
See <a href="paper-radio-button">paper-radio-button</a> for more
information about `paper-radio-button`.
@group Paper Elements
@element paper-radio-group
@hero hero.svg
@demo demo/index.html
-->
<dom-module id="paper-radio-group">
<style>
:host {
display: inline-block;
}
:host ::content > * {
padding: 12px;
}
</style>
<template>
<content id="items" select="*"></content>
</template>
</dom-module>
<script>
Polymer({
is: 'paper-radio-group',
behaviors: [
Polymer.IronA11yKeysBehavior,
Polymer.IronSelectableBehavior
],
hostAttributes: {
role: 'radiogroup',
tabindex: 0
},
properties: {
/**
* Fired when the radio group selection changes.
*
* @event paper-radio-group-changed
*/
/**
* Overriden from Polymer.IronSelectableBehavior
*/
attrForSelected: {
type: String,
value: 'name'
},
/**
* Overriden from Polymer.IronSelectableBehavior
*/
selectedAttribute: {
type: String,
value: 'checked'
},
/**
* Overriden from Polymer.IronSelectableBehavior
*/
selectable: {
type: String,
value: 'paper-radio-button'
},
/**
* If true, radio-buttons can be deselected
*/
allowEmptySelection: {
type: Boolean,
value: false
}
},
keyBindings: {
'left up': 'selectPrevious',
'right down': 'selectNext',
},
/**
* Selects the given value.
*/
select: function(value) {
if (this.selected) {
var oldItem = this._valueToItem(this.selected);
if (this.selected == value) {
// If deselecting is allowed we'll have to apply an empty selection.
// Otherwise, we should force the selection to stay and make this
// action a no-op.
if (this.allowEmptySelection) {
value = '';
} else {
oldItem.checked = true;
return;
}
}
if (oldItem)
oldItem.checked = false;
}
Polymer.IronSelectableBehavior.select.apply(this, [value]);
this.fire('paper-radio-group-changed');
},
/**
* Selects the previous item. If the previous item is disabled, then it is
* skipped, and its previous item is selected
*/
selectPrevious: function() {
var length = this.items.length;
var newIndex = Number(this._valueToIndex(this.selected));
do {
newIndex = (newIndex - 1 + length) % length;
} while (this.items[newIndex].disabled)
this.select(this._indexToValue(newIndex));
},
/**
* Selects the next item. If the next item is disabled, then it is
* skipped, and the next item after it is selected.
*/
selectNext: function() {
var length = this.items.length;
var newIndex = Number(this._valueToIndex(this.selected));
do {
newIndex = (newIndex + 1 + length) % length;
} while (this.items[newIndex].disabled)
this.select(this._indexToValue(newIndex));
},
});
</script>