Disable the checkbox once it is checked

[Alison]

Just want to share the solution on how to disable the checkbox once it is checked. Please put the following code into the footer after the HTML editor is disabled:

<script>
document.addEventListener("DataPageReady", function () {
    let chkbox= document.querySelectorAll('[id^="InsertRecord"]')[0];

    if (chkbox.checked) {
        chkbox.setAttribute("disabled", "disabled");
    }

    chkbox.onclick = function () {
        if (chkbox.checked) {
            chkbox.setAttribute("disabled", "disabled");
        }
    };
});
</script>