regex pattern with form for ruby on rails

Question

is there support for pattern attribute when using form_for?

<%= form_for order_form do |f| %>
<%= f.label "name" %>
<%= f.text_field :name, required: true %>
<%= f.label "Number" %>
<%= f.telephone_field :phone, pattern: "\\d{10}" %>
<%= f.submit %>

I'm trying to put together a regex pattern to ensure that phone numbers are in correct format. My problem is that the pattern attribute wont take regex only strings

<%= f.telephone_field :phone, pattern: /\d{10}/ %> doesnt work

so when i write the regex as a string it causes problems, (like having to escape backslashes e.g.

"\\d{10}" == /\d{10}/

should i just forgo using form_for on this form or is there a way to use form_for and pattern matching together

You can use javascript for validation on forms on the front end, or rails model validations (and then also db validation) on the back end. Those are what I know of- it's possible form_for or html5 has validations of its own. — Dbz
– Dbz, Commented Dec 13, 2016 at 0:00
Why is pattern: "\\d{10}" a problem? The pattern attribute in HTML holds text that is interpreted as a JavaScript regex (not a Ruby one). If typing \\d is really so much trouble then use pattern: '\d{10}' instead. Embedding one language inside another is always a little messy, more so when you're embedding one language (JavaScript regex) inside another (HTML) inside another (Ruby) inside another (ERB). — mu is too short
– mu is too short, Commented Dec 13, 2016 at 0:35
its not about escaping backslashes being a problem or a hassle, Im just trying to make sure i use best practices — ChadTheDev
– ChadTheDev, Commented Dec 13, 2016 at 3:07

kergrau · Accepted Answer · 2017-12-27 20:38:01Z

5

I was trying some similar but I work in Rails 5.1.4 My code is:

<%= form.telephone_field :telefono, id: :person_telefono,
:pattern => '\d{10}', :placeholder => "solo numeros"%>

Try to adapte it for your program and rails version.

Regards

answered Dec 27, 2017 at 20:38

kergrau

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