(function(){


    let submitForm = document.getElementsByName("fQuery")[0]

    let shopFiltersCheckboxes = Array.from(document.querySelectorAll('.shop-filter') );
    let allShopCheckbox = document.getElementById('allShopCheckbox');

    // Текстовые поля формы

    let titleInput = document.getElementById("bookSearchFormTitleTextField");
    let authorInput = document.getElementById("bookSearchFormAuthorsTextField");
    let isbnInput = document.getElementById("bookSearchFormISBNTextField");
    let publisherInput  = document.getElementById("publisherTextField");
    let submitBtn = document.getElementById("searchSubmitBtn")


    submitForm.onsubmit = function() {
        return !!((isbnInput.value || titleInput.value || authorInput.value || publisherInput.value) && !submitBtn.classList.contains('book-search-form__submit-button--disabled'));
    }

}());