const submit_btn = document.getElementById('submit');
const title_obj = document.getElementById('title');
const desc_obj = document.getElementById('desc');
const date_obj = document.getElementById('date');
const messenger = document.getElementById('messenger');

document.addEventListener('DOMContentLoaded')

submit_btn.addEventListener(onclick, () => {
    var title = title_obj.value;
    var desc = desc_obj.value;
    var date_str = date_obj.value;

    if (title == null || desc == null || date == null) {
        messenger.innerHTML = '請填寫所有欄位';
        messenger.classList.remove("hide");
        return;
    }

    const date = new Date(date_str);
});