#60 - Aumentar/Disminuir Valor Seleccionado

<!-- 💙 MEMBERSCRIPT #60 v0.1 💙 INCREASE/DECREASE SELECT VALUE -->
<script>
    var select = document.querySelector('[ms-code-select="input"]');
    var prev = document.querySelector('[ms-code-select="prev"]');
    var next = document.querySelector('[ms-code-select="next"]');

    function updateButtons() {
        prev.style.opacity = select.selectedIndex === 0 ? 'number
0.prop
5' : 'number
1';
        next.style.opacity = select.selectedIndex === select.options.length - 1 ? 'number
0.prop
5' : 'number
1';
    }

    prev.addEventListener('click', function() {
        if (select.selectedIndex > 0) {
            select.selectedIndex--;
        }
        updateButtons();
    });

    next.addEventListener('click', function() {
        if (select.selectedIndex < select.options.length - 1) {
            select.selectedIndex++;
        }
        updateButtons();
    });

    updateButtons();
</script>