text: /**
   * @license
   * Copyright 2015 Google Inc. All Rights Reserved.
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  (function() {
    'use strict';
  
    /**
     * Class constructor for Button MDL component.
     * Implements MDL component design pattern defined at:
     * https://github.com/jasonmayes/mdl-component-design-pattern
     *
     * @param {HTMLElement} element The element that will be upgraded.
     */
    var MaterialButton = function MaterialButton(element) {
      this.element_ = element;
  
      // Initialize instance.
      this.init();
    };
    window['MaterialButton'] = MaterialButton;
  
    /**
     * Store constants in one place so they can be updated easily.
     *
     * @enum {string | number}
     * @private
     */
    MaterialButton.prototype.Constant_ = {
      // None for now.
    };
  
    /**
     * Store strings for class names defined by this component that are used in
     * JavaScript. This allows us to simply change it in one place should we
     * decide to modify at a later date.
     *
     * @enum {string}
     * @private
     */
    MaterialButton.prototype.CssClasses_ = {
      RIPPLE_EFFECT: 'mdl-js-ripple-effect',
      RIPPLE_CONTAINER: 'mdl-button__ripple-container',
      RIPPLE: 'mdl-ripple'
    };
  
    /**
     * Handle blur of element.
     *
     * @param {Event} event The event that fired.
     * @private
     */
    MaterialButton.prototype.blurHandler_ = function(event) {
      if (event) {
        this.element_.blur();
      }
    };
  
    // Public methods.
  
    /**
     * Disable button.
     *
     * @public
     */
    MaterialButton.prototype.disable = function() {
      this.element_.disabled = true;
    };
    MaterialButton.prototype['disable'] = MaterialButton.prototype.disable;
  
    /**
     * Enable button.
     *
     * @public
     */
    MaterialButton.prototype.enable = function() {
      this.element_.disabled = false;
    };
    MaterialButton.prototype['enable'] = MaterialButton.prototype.enable;
  
    /**
     * Initialize element.
     */
    MaterialButton.prototype.init = function() {
      if (this.element_) {
        if (this.element_.classList.contains(this.CssClasses_.RIPPLE_EFFECT)) {
          var rippleContainer = document.createElement('span');
          rippleContainer.classList.add(this.CssClasses_.RIPPLE_CONTAINER);
          this.rippleElement_ = document.createElement('span');
          this.rippleElement_.classList.add(this.CssClasses_.RIPPLE);
          rippleContainer.appendChild(this.rippleElement_);
          this.boundRippleBlurHandler = this.blurHandler_.bind(this);
          this.rippleElement_.addEventListener('mouseup', this.boundRippleBlurHandler);
          this.element_.appendChild(rippleContainer);
        }
        this.boundButtonBlurHandler = this.blurHandler_.bind(this);
        this.element_.addEventListener('mouseup', this.boundButtonBlurHandler);
        this.element_.addEventListener('mouseleave', this.boundButtonBlurHandler);
      }
    };
  
    // The component registers itself. It can assume componentHandler is available
    // in the global scope.
    componentHandler.register({
      constructor: MaterialButton,
      classAsString: 'MaterialButton',
      cssClass: 'mdl-js-button',
      widget: true
    });
  })();
  