Hidden fields should not be added if existing already

[larsblumberg]

Plugin version

v24.6.0

Steps to reproduce

1. set hiddenInput: () => ({ phone: "phone_full", country: "phone_country" })`
2. provide these hidden inputs yourself in the form (there are advantages for certain scripting like referencing these before the library creates them dynamically)

Expected behaviour

• library does not add hidden inputs a 2nd time, because we already set them up

Actual behaviour

• value of above inputs gets correctly set
• but additional hidden inputs are being added

Initialisation options

  intlTelInput(input, {
    hiddenInput: () => ({ phone: "phone_full", country: "phone_country" }),
    loadUtilsOnInit: () => import("intl-tel-input/utils"),
  });

[jackocnr]

I'm onboard with this idea. We just need to check if the hidden inputs already exist (within the form) before creating them.

I don't have time to implement this myself right now, but I would welcome a pull request.