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bower_components/iron-validatable-behavior/iron-validatable-behavior.html 3.17 KB
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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-meta/iron-meta.html">
  
  <script>
  
    /**
     * Use `Polymer.IronValidatableBehavior` to implement an element that validates user input.
     *
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     * ### Accessibility
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     *
     * Changing the `invalid` property, either manually or by calling `validate()` will update the
     * `aria-invalid` attribute.
     *
     * @demo demo/index.html
     * @polymerBehavior
     */
    Polymer.IronValidatableBehavior = {
  
      properties: {
  
        /**
         * Namespace for this validator.
         */
        validatorType: {
          type: String,
          value: 'validator'
        },
  
        /**
         * Name of the validator to use.
         */
        validator: {
          type: String
        },
  
        /**
         * True if the last call to `validate` is invalid.
         */
        invalid: {
          notify: true,
          reflectToAttribute: true,
          type: Boolean,
          value: false
        },
  
        _validatorMeta: {
          type: Object
        }
  
      },
  
      observers: [
        '_invalidChanged(invalid)'
      ],
  
      get _validator() {
        return this._validatorMeta && this._validatorMeta.byKey(this.validator);
      },
  
      ready: function() {
        this._validatorMeta = new Polymer.IronMeta({type: this.validatorType});
      },
  
      _invalidChanged: function() {
        if (this.invalid) {
          this.setAttribute('aria-invalid', 'true');
        } else {
          this.removeAttribute('aria-invalid');
        }
      },
  
      /**
       * @return {boolean} True if the validator `validator` exists.
       */
      hasValidator: function() {
        return this._validator != null;
      },
  
      /**
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       * Returns true if the `value` is valid, and updates `invalid`. If you want
       * your element to have custom validation logic, do not override this method;
       * override `_getValidity(value)` instead.
  
       * @param {Object} value The value to be validated. By default, it is passed
       * to the validator's `validate()` function, if a validator is set.
       * @return {boolean} True if `value` is valid.
       */
      validate: function(value) {
        this.invalid = !this._getValidity(value);
        return !this.invalid;
      },
  
      /**
       * Returns true if `value` is valid.  By default, it is passed
       * to the validator's `validate()` function, if a validator is set. You
       * should override this method if you want to implement custom validity
       * logic for your element.
       *
       * @param {Object} value The value to be validated.
       * @return {boolean} True if `value` is valid.
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       */
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      _getValidity: function(value) {
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        if (this.hasValidator()) {
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          return this._validator.validate(value);
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        }
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        return true;
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      }
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    };
  
  </script>