getAll(form_id) {
        this._checkInit(form_id);
        /*const data = {};
        const items = this._collection[form_id].entries();
        for (let item of items) {
            data[item[0]] = item[1];
        }
        return data;*/
        return this._collection[form_id].getAllElements();
    }
Get all form input values as key - value object
@param form_id
@returns {object}