When check box is selected, it copies value from customer to invoice party. So I am assuming that when check box selected. value is automatic. but it is saying undefined array key.
function EnableDisableTextBox(tickSame) {
var shipper = document.getElementById("iP");
var customer = document.getElementById("consignee").value;
document.getElementById("iP").value=customer;
shipper.disabled = tickSame.checked ? true : false;
if (shipper.enabled) {
shipper.blur();
}
}
>Solution :
I hope you are submitting the form to the server side. Disabled inputs will not submit data when submitting the form. Instead you can use readonly attribute to make to non editable (Even you can make it look like disabled with css)
function EnableDisableTextBox(tickSame) {
var shipper = document.getElementById("iP");
var customer = document.getElementById("consignee").value;
document.getElementById("iP").value=customer;
shipper.readonly= tickSame.checked ? true : false;
if (shipper.readonly) {
shipper.blur();
}
}