Uncaught TypeError: Undefined is not a function on indexOf

Question

I currently have this code to check the website URL GET options for a specific ID, but whenever this code is run, I get a weird error: Uncaught TypeError: Undefined is not

Answer 1

window.location is a Location object, not a string, and indexOf is a String (or Array) method.

If you want to search the query params, try

window.location.search.indexOf(familyId)

or if you want check the whole url,

window.location.toString().indexOf(familyId)