function getFirst(item, className) {
    return item.getElementsByClassName(className)[0]
}

var saveBtn = document.getElementById("save-btn");

for (chk of document.getElementsByClassName("pgrid")) {
    chk.onclick = (event) => {
        console.log(event.target)
        event.target.dataset.mark = event.target.dataset.mark == "True" ? "False" : "True"
        event.target.children[0].name = event.target.dataset.targ;
        event.target.children[0].value = event.target.dataset.mark;
        event.target.dataset.changed = true;
        saveBtn.style.display = "block";
    }
}