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document.querySelector('.prod_table').classList.add('table_sort');
document.addEventListener('DOMContentLoaded', () => {

    const getSort = ({ target }) => {
        const order = (target.dataset.order = -(target.dataset.order || -1));
        const index = [...target.parentNode.cells].indexOf(target);
        const collator = new Intl.Collator(['en', 'ru'], { numeric: true });
        const comparator = (index, order) => (a, b) => order * collator.compare(
            a.children[index].innerHTML,
            b.children[index].innerHTML
        );
        
        for(const tBody of target.closest('table').tBodies)
            tBody.append(...[...tBody.rows].sort(comparator(index, order)));

        for(const cell of target.parentNode.cells)
            cell.classList.toggle('sorted', cell === target);
    };
    
    document.querySelectorAll('.table_sort thead').forEach(tableTH => tableTH.addEventListener('click', () => getSort(event)));
    
});

.table_sort th {
    cursor: pointer;
}
.table_sort td,
.table_sort th {
    text-align: center;
}
th.sorted[data-order="1"],
th.sorted[data-order="-1"] {
    position: relative;
}

th.sorted[data-order="1"]::after,
th.sorted[data-order="-1"]::after {
    right: 8px;
    position: absolute;
}

th.sorted[data-order="-1"]::after {
	content: "▼"
}

th.sorted[data-order="1"]::after {
	content: "▲"
}