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| 1 <!-- |
| 2 @license |
| 3 Copyright (c) 2015 The Polymer Project Authors. All rights reserved. |
| 4 This code may only be used under the BSD style license found at http://polymer.g
ithub.io/LICENSE.txt |
| 5 The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt |
| 6 The complete set of contributors may be found at http://polymer.github.io/CONTRI
BUTORS.txt |
| 7 Code distributed by Google as part of the polymer project is also |
| 8 subject to an additional IP rights grant found at http://polymer.github.io/PATEN
TS.txt |
| 9 --> |
| 10 |
| 11 <link rel="import" href="../polymer/polymer.html"> |
| 12 <link rel="import" href="../iron-validatable-behavior/iron-validatable-behavior.
html"> |
| 13 <link rel="import" href="../iron-form-element-behavior/iron-form-element-behavio
r.html"> |
| 14 |
| 15 <script> |
| 16 |
| 17 /** |
| 18 * Use `Polymer.IronCheckedElementBehavior` to implement a custom element |
| 19 * that has a `checked` property, which can be used for validation if the |
| 20 * element is also `required`. Element instances implementing this behavior |
| 21 * will also be registered for use in an `iron-form` element. |
| 22 * |
| 23 * @demo demo/index.html |
| 24 * @polymerBehavior Polymer.IronCheckedElementBehavior |
| 25 */ |
| 26 Polymer.IronCheckedElementBehaviorImpl = { |
| 27 |
| 28 properties: { |
| 29 /** |
| 30 * Fired when the checked state changes. |
| 31 * |
| 32 * @event iron-change |
| 33 */ |
| 34 |
| 35 /** |
| 36 * Gets or sets the state, `true` is checked and `false` is unchecked. |
| 37 */ |
| 38 checked: { |
| 39 type: Boolean, |
| 40 value: false, |
| 41 reflectToAttribute: true, |
| 42 notify: true, |
| 43 observer: '_checkedChanged' |
| 44 }, |
| 45 |
| 46 /** |
| 47 * If true, the button toggles the active state with each tap or press |
| 48 * of the spacebar. |
| 49 */ |
| 50 toggles: { |
| 51 type: Boolean, |
| 52 value: true, |
| 53 reflectToAttribute: true |
| 54 }, |
| 55 |
| 56 /* Overriden from Polymer.IronFormElementBehavior */ |
| 57 value: { |
| 58 type: String, |
| 59 value: 'on', |
| 60 observer: '_valueChanged' |
| 61 } |
| 62 }, |
| 63 |
| 64 observers: [ |
| 65 '_requiredChanged(required)' |
| 66 ], |
| 67 |
| 68 created: function() { |
| 69 // Used by `iron-form` to handle the case that an element with this behavi
or |
| 70 // doesn't have a role of 'checkbox' or 'radio', but should still only be |
| 71 // included when the form is serialized if `this.checked === true`. |
| 72 this._hasIronCheckedElementBehavior = true; |
| 73 }, |
| 74 |
| 75 /** |
| 76 * Returns false if the element is required and not checked, and true otherw
ise. |
| 77 * @param {*=} _value Ignored. |
| 78 * @return {boolean} true if `required` is false, or if `required` and `chec
ked` are both true. |
| 79 */ |
| 80 _getValidity: function(_value) { |
| 81 return this.disabled || !this.required || (this.required && this.checked); |
| 82 }, |
| 83 |
| 84 /** |
| 85 * Update the aria-required label when `required` is changed. |
| 86 */ |
| 87 _requiredChanged: function() { |
| 88 if (this.required) { |
| 89 this.setAttribute('aria-required', 'true'); |
| 90 } else { |
| 91 this.removeAttribute('aria-required'); |
| 92 } |
| 93 }, |
| 94 |
| 95 /** |
| 96 * Fire `iron-changed` when the checked state changes. |
| 97 */ |
| 98 _checkedChanged: function() { |
| 99 this.active = this.checked; |
| 100 this.fire('iron-change'); |
| 101 }, |
| 102 |
| 103 /** |
| 104 * Reset value to 'on' if it is set to `undefined`. |
| 105 */ |
| 106 _valueChanged: function() { |
| 107 if (this.value === undefined || this.value === null) { |
| 108 this.value = 'on'; |
| 109 } |
| 110 } |
| 111 }; |
| 112 |
| 113 /** @polymerBehavior Polymer.IronCheckedElementBehavior */ |
| 114 Polymer.IronCheckedElementBehavior = [ |
| 115 Polymer.IronFormElementBehavior, |
| 116 Polymer.IronValidatableBehavior, |
| 117 Polymer.IronCheckedElementBehaviorImpl |
| 118 ]; |
| 119 |
| 120 </script> |
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