jQuery multiple conditions within if statement

Try

if (!(i == 'InvKey' || i == 'PostDate')) {

if (i != 'InvKey' || i != 'PostDate') {

that says if i does not equals InvKey OR PostDate

i == 'InvKey' && i == 'PostDate' will never be true, since i can never equal two different things at once.

You're probably trying to write

if (i !== 'InvKey' && i !== 'PostDate'))

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