Confirm input / validation to compare 2 forms fields contain the same data

[bjarnef]

I just saw this on Our https://our.umbraco.com/forum/using-umbraco-and-getting-started/103806-umbraco-forms-add-custom-validation and as far I know Umbraco Forms hasn't a feature out of the box to compare two fields?
It can probably be done with some custom fields, but I wonder if this would make sense to add in Umbraco Forms?

For example in a registration form, where you may want to verify the email address.

[AaronSadlerUK]

@bjarnef I wrote this last year, and it does exactly what your after:
https://github.com/ActiveIS/ActiveIS.UmbracoForms.ConfirmInput

I agree it should be a core feature though

[nul800sebastiaan]

👍 looks like a neat feature to work on for a future version.

[umbrabot]

Hiya @bjarnef,

Just wanted to let you know that we noticed that this issue got a bit stale and might not be relevant any more.

We will close this issue for now but we're happy to open it up again if you think it's still relevant (for example: it's a feature request that's not yet implemented, or it's a bug that's not yet been fixed).

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[bjarnef]

@umbrabot still relevant

[bjarnef]

I solved this recently via a custom field type combined with equalTo in jQuery validation to do the client side validation.
umbraco/UmbracoDocs#4215

The great thing about this if the existing "Mandatory" and "Regex" properties are used on both fields, so it can be confirm of email, phone number, etc.

But also option to set FieldType, MaximumLength og Autocomplete properties.

[bjarnef]

@nul800sebastiaan @AndyButland in case this would be integrated into Umbraco Forms core, feel free to be inspired on the documentation example :)

[bjarnef]

The example also seems to work with asp-net-validation although it seems it need data-val-equalto-other="*.@field?.Id" instead of data-val-equalto-other="@field?.Id" and didn't seem to re-validate when changing value in the other field - like jQuery validation does.

Something I think would be useful is to have "Form Context" available or just Form Guid available, so you know the current form and can access other fields in the form.