states.js

/**
* DO NOT EDIT THIS FILE.
* See the following change record for more information,
* https://www.drupal.org/node/2815083
* @preserve
**/

(function ($, Drupal) {
  var states = {
    postponed: []
  };

  Drupal.states = states;

  Drupal.behaviors.states = {
    attach: function attach(context, settings) {
      var $states = $(context).find('[data-drupal-states]');
      var il = $states.length;

      var _loop = function _loop(i) {
        var config = JSON.parse($states[i].getAttribute('data-drupal-states'));
        Object.keys(config || {}).forEach(function (state) {
          new states.Dependent({
            element: $($states[i]),
            state: states.State.sanitize(state),
            constraints: config[state]
          });
        });
      };

      for (var i = 0; i < il; i++) {
        _loop(i);
      }

      while (states.postponed.length) {
        states.postponed.shift()();
      }
    }
  };

  states.Dependent = function (args) {
    var _this = this;

    $.extend(this, { values: {}, oldValue: null }, args);

    this.dependees = this.getDependees();
    Object.keys(this.dependees || {}).forEach(function (selector) {
      _this.initializeDependee(selector, _this.dependees[selector]);
    });
  };

  states.Dependent.comparisons = {
    RegExp: function RegExp(reference, value) {
      return reference.test(value);
    },
    Function: function Function(reference, value) {
      return reference(value);
    },
    Number: function Number(reference, value) {
      return typeof value === 'string' ? _compare2(reference.toString(), value) : _compare2(reference, value);
    }
  };

  states.Dependent.prototype = {
    initializeDependee: function initializeDependee(selector, dependeeStates) {
      var state = void 0;
      var self = this;

      function stateEventHandler(e) {
        self.update(e.data.selector, e.data.state, e.value);
      }

      this.values[selector] = {};

      for (var i in dependeeStates) {
        if (dependeeStates.hasOwnProperty(i)) {
          state = dependeeStates[i];

          if ($.inArray(state, dependeeStates) === -1) {
            continue;
          }

          state = states.State.sanitize(state);

          this.values[selector][state.name] = null;

          $(selector).on('state:' + state, { selector: selector, state: state }, stateEventHandler);

          new states.Trigger({ selector: selector, state: state });
        }
      }
    },
    compare: function compare(reference, selector, state) {
      var value = this.values[selector][state.name];
      if (reference.constructor.name in states.Dependent.comparisons) {
        return states.Dependent.comparisons[reference.constructor.name](reference, value);
      }

      return _compare2(reference, value);
    },
    update: function update(selector, state, value) {
      if (value !== this.values[selector][state.name]) {
        this.values[selector][state.name] = value;
        this.reevaluate();
      }
    },
    reevaluate: function reevaluate() {
      var value = this.verifyConstraints(this.constraints);

      if (value !== this.oldValue) {
        this.oldValue = value;

        value = invert(value, this.state.invert);

        this.element.trigger({ type: 'state:' + this.state, value: value, trigger: true });
      }
    },
    verifyConstraints: function verifyConstraints(constraints, selector) {
      var result = void 0;
      if ($.isArray(constraints)) {
        var hasXor = $.inArray('xor', constraints) === -1;
        var len = constraints.length;
        for (var i = 0; i < len; i++) {
          if (constraints[i] !== 'xor') {
            var constraint = this.checkConstraints(constraints[i], selector, i);

            if (constraint && (hasXor || result)) {
              return hasXor;
            }
            result = result || constraint;
          }
        }
      } else if ($.isPlainObject(constraints)) {
          for (var n in constraints) {
            if (constraints.hasOwnProperty(n)) {
              result = ternary(result, this.checkConstraints(constraints[n], selector, n));

              if (result === false) {
                return false;
              }
            }
          }
        }
      return result;
    },
    checkConstraints: function checkConstraints(value, selector, state) {
      if (typeof state !== 'string' || /[0-9]/.test(state[0])) {
        state = null;
      } else if (typeof selector === 'undefined') {
        selector = state;
        state = null;
      }

      if (state !== null) {
        state = states.State.sanitize(state);
        return invert(this.compare(value, selector, state), state.invert);
      }

      return this.verifyConstraints(value, selector);
    },
    getDependees: function getDependees() {
      var cache = {};

      var _compare = this.compare;
      this.compare = function (reference, selector, state) {
        (cache[selector] || (cache[selector] = [])).push(state.name);
      };

      this.verifyConstraints(this.constraints);

      this.compare = _compare;

      return cache;
    }
  };

  states.Trigger = function (args) {
    $.extend(this, args);

    if (this.state in states.Trigger.states) {
      this.element = $(this.selector);

      if (!this.element.data('trigger:' + this.state)) {
        this.initialize();
      }
    }
  };

  states.Trigger.prototype = {
    initialize: function initialize() {
      var _this2 = this;

      var trigger = states.Trigger.states[this.state];

      if (typeof trigger === 'function') {
        trigger.call(window, this.element);
      } else {
        Object.keys(trigger || {}).forEach(function (event) {
          _this2.defaultTrigger(event, trigger[event]);
        });
      }

      this.element.data('trigger:' + this.state, true);
    },
    defaultTrigger: function defaultTrigger(event, valueFn) {
      var oldValue = valueFn.call(this.element);

      this.element.on(event, $.proxy(function (e) {
        var value = valueFn.call(this.element, e);

        if (oldValue !== value) {
          this.element.trigger({ type: 'state:' + this.state, value: value, oldValue: oldValue });
          oldValue = value;
        }
      }, this));

      states.postponed.push($.proxy(function () {
        this.element.trigger({ type: 'state:' + this.state, value: oldValue, oldValue: null });
      }, this));
    }
  };

  states.Trigger.states = {
    empty: {
      keyup: function keyup() {
        return this.val() === '';
      }
    },

    checked: {
      change: function change() {
        var checked = false;
        this.each(function () {
          checked = $(this).prop('checked');

          return !checked;
        });
        return checked;
      }
    },

    value: {
      keyup: function keyup() {
        if (this.length > 1) {
          return this.filter(':checked').val() || false;
        }
        return this.val();
      },
      change: function change() {
        if (this.length > 1) {
          return this.filter(':checked').val() || false;
        }
        return this.val();
      }
    },

    collapsed: {
      collapsed: function collapsed(e) {
        return typeof e !== 'undefined' && 'value' in e ? e.value : !this.is('[open]');
      }
    }
  };

  states.State = function (state) {
    this.pristine = state;
    this.name = state;

    var process = true;
    do {
      while (this.name.charAt(0) === '!') {
        this.name = this.name.substring(1);
        this.invert = !this.invert;
      }

      if (this.name in states.State.aliases) {
        this.name = states.State.aliases[this.name];
      } else {
        process = false;
      }
    } while (process);
  };

  states.State.sanitize = function (state) {
    if (state instanceof states.State) {
      return state;
    }

    return new states.State(state);
  };

  states.State.aliases = {
    enabled: '!disabled',
    invisible: '!visible',
    invalid: '!valid',
    untouched: '!touched',
    optional: '!required',
    filled: '!empty',
    unchecked: '!checked',
    irrelevant: '!relevant',
    expanded: '!collapsed',
    open: '!collapsed',
    closed: 'collapsed',
    readwrite: '!readonly'
  };

  states.State.prototype = {
    invert: false,

    toString: function toString() {
      return this.name;
    }
  };

  var $document = $(document);
  $document.on('state:disabled', function (e) {
    if (e.trigger) {
      $(e.target).prop('disabled', e.value).closest('.js-form-item, .js-form-submit, .js-form-wrapper').toggleClass('form-disabled', e.value).find('select, input, textarea').prop('disabled', e.value);
    }
  });

  $document.on('state:required', function (e) {
    if (e.trigger) {
      if (e.value) {
        var label = 'label' + (e.target.id ? '[for=' + e.target.id + ']' : '');
        var $label = $(e.target).attr({ required: 'required', 'aria-required': 'aria-required' }).closest('.js-form-item, .js-form-wrapper').find(label);

        if (!$label.hasClass('js-form-required').length) {
          $label.addClass('js-form-required form-required');
        }
      } else {
        $(e.target).removeAttr('required aria-required').closest('.js-form-item, .js-form-wrapper').find('label.js-form-required').removeClass('js-form-required form-required');
      }
    }
  });

  $document.on('state:visible', function (e) {
    if (e.trigger) {
      $(e.target).closest('.js-form-item, .js-form-submit, .js-form-wrapper').toggle(e.value);
    }
  });

  $document.on('state:checked', function (e) {
    if (e.trigger) {
      $(e.target).prop('checked', e.value);
    }
  });

  $document.on('state:collapsed', function (e) {
    if (e.trigger) {
      if ($(e.target).is('[open]') === e.value) {
        $(e.target).find('> summary').trigger('click');
      }
    }
  });

  function ternary(a, b) {
    if (typeof a === 'undefined') {
      return b;
    } else if (typeof b === 'undefined') {
      return a;
    }

    return a && b;
  }

  function invert(a, invertState) {
    return invertState && typeof a !== 'undefined' ? !a : a;
  }

  function _compare2(a, b) {
    if (a === b) {
      return typeof a === 'undefined' ? a : true;
    }

    return typeof a === 'undefined' || typeof b === 'undefined';
  }
})(jQuery, Drupal);