constructor(params) {
    this.id_ = params.id;
    this.params_ = params;
    this.fields_ = params.fields;
    this.fields_.forEach(field => field.setForm_(this));
    this.fields_.forEach(field => field.createUi(params.container));
  }
Creates a new form with the given parameters.
@constructor
@param {Array} [params.inputs] A list of inputs