[Rise]

Lisa85, formatting

<script>
$(document).ready(() => {
    $('#buttonX').on('click', () => {
        const value = $('#textX').val();
        if (value) {
            storage(value);
            window.location.href = '?value='+value;
        } else {
            alert('Empty!');
        }
    });
    const values = storage();
    $('#selectX').append(values.reduce((prev, value) => prev+'<option>'+value+'</option>', ''));
});

function storage(data) {
    const _data = JSON.parse(sessionStorage.getItem('data')) || [];
    if (data) {
        _data.push(data);
        sessionStorage.setItem('data', JSON.stringify(_data));
    }
    return _data;
}
</script>

<input id="textX">
<select id="selectX"></select>
<button id="buttonX">Button</button>