document.getElementById("LookupField").addEventListener("change", function(){
var lookupValue = document.getElementById("LookupField").value;
if (lookupValue === "") {
// Show and make Field1 and Field2 required.
document.getElementById("Field1").style.display = "block";
document.getElementById("Field1").required = true;
document.getElementById("Field2").style.display = "block";
document.getElementById("Field2").required = true;
} else {
// Hide and make Field1 and Field2 optional.
document.getElementById("Field1").style.display = "none";
document.getElementById("Field1").required = false;
document.getElementById("Field2").style.display = "none";
document.getElementById("Field2").required = false;
}
});
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