How to change the message when a form input doesn't match the pattern parameter?

Question

A pattern argument can be provided to a form field as described here

Example (regex from here)

<%= f.text_field :username, pattern: "([A-Za-z0-9\-\_]+)" %>

When the regex is not adhered to, a message is displayed. E.g.:

How can that message be customised?

mikezter · Accepted Answer · 2020-10-29 11:47:40Z

2

The pattern attribute is actually a HTML spec, not a Rails thing. You can use the title attribute to give users a hint on to what format is expected.

<%= f.text_field :username, pattern: "([A-Za-z0-9\-\_]+)",
                            title: "A username can only contain letters, numbers, hyphens and underscores" %>

Find more information here: https://html.spec.whatwg.org/multipage/input.html#the-pattern-attribute

answered Oct 29, 2020 at 11:47

mikezter

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1 Comment

stevec Over a year ago

Thanks for explaining that, I really couldn't figure out why pattern seemed to be missing from form_for rails guides/docs. I will know for next time now

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