Hi Joe,
Thanks for your detailed problem explanation.
The culprit of your problem is - when there is no response parameter - link will not execute.
Here is what you should to do.
1 Delete current link to your "visible" property.
2 Make link from "$" to "GRID".
3 Click "JS" and populate it with following code:
pre
//Print current "ContactNumber" to console(debug reasons).
console.log("ContactNumber = " + value.ContactNumber);
//Condition that is "ContactNumber" is exists.
if(value.ContactNumber){
//Show grid if ContactNumber is here.
Apperyio("GRID").show()
}
else{
//Hide grid if ContactNumber is not here.
Apperyio("GRID").hide();
}
/pre
That's all.
Regards.