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<script>

Polymer({

  is: 'simple-form',

  extends: 'form',

  properties: {
    formElements: {
      type: Object,
      notify: true
    }
  },

  listeners: {
    'iron-form-element-register': '_elementRegistered',
    'iron-form-element-unregister': '_elementUnregistered'
  },

  ready: function() {
    this.formElements = [];
  },

  _elementRegistered: function(e) {
    this.formElements.push(e.target);
    e.target._parentForm = this;
  },

  _elementUnregistered: function(e) {
    var target = e.detail.target;
    if (target) {
      var index = this.formElements.indexOf(target);
      if (index > -1) {
        this.formElements.splice(index, 1);
      }
    }
  }

});

</script>