$(document).ready(function () {
    // var highest_amount = 0;
    $('input[name^=\'amount_\']').change(
        function () {
            var clickedRadio = this;
            var afterClickedRadio = false;
            var formIsValid = true;

            var radios = document.querySelectorAll('input[name^=\'amount_\']');

// Automatic completion
            for (i = 0; i < radios.length; ++i) {
                var radio = radios[i];
                if (radio == clickedRadio) {
                    afterClickedRadio = true;
                    continue;
                }
                if (!afterClickedRadio && clickedRadio.value == 'left' && radio.value == 'left') {
                    radio.checked = true;
                }
                if (afterClickedRadio && clickedRadio.value == 'right' && radio.value == 'right') {
                    radio.checked = true;
                }

            }

// Check if list complete
for (i = 0; i < radios.length; ++i) {
var radio = radios[i];
if (!radio.checked) {
    if (radio.value == "right") {
        if (!radios[i-1].checked) {
            formIsValid = false
        }
    }
    if (radio.value == "left") {
        if (!radios[i+1].checked) {
            formIsValid = false
        }
    }
}
}


if (formIsValid) {
// Set switching point variable
    for (i = 0; i < radios.length; ++i) {
        var radio = radios[i];
        // if (radio.dataset.amount > highest_amount) {
        //     highest_amount = radio.dataset.amount
        // }
        if (radio.value == 'right' && radio.checked) {
            $('#switching_point').val(radio.dataset.amount);
            break;
        } else {
            $('#switching_point').val(9999);
        }
    };
// Enable button if all radio buttons checked
    $('#submit_posterior').prop('disabled', false);

}


        }
);

})