Checking .html.erb file validity

[Tom Hale]

I'm want to check the validity of .html.erb files, at both the erb and
HTML levels.

I purposely put in weird, unmatched tags to test out rails-erb-lint[1] and
rails-erb-check[2]. I also changed a <% else %> to <% elXse %> and both
said my file was valid.

So...

Q1) How do I get feedback on what is actually wrong with my .erb syntax?

Q2) How can I validate that the eventual HTML output is also valid, and
not just relying on my browser being tolerant?

Q3) Do many people use erb in production or should I be using something
"better"? Something with a decent error checker? (bonus points for
integrating with vim/syntastic)

Thanks all,
Tom

[1] https://rubygems.org/gems/rails-erb-lint/versions/1.1.6
[2] https://github.com/jugyo/rails-erb-check

[Andrew Grimm]

I use haml instead of erb, and haml-lint does a good of checking your code. It even uses RuboCop.

I'm not sure whether this'll help, but maybe try using a tool that converts your erb into haml, and then running haml-lint on the output.

Andrew

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[Craig R Webster]

Hi Tom,

On 20 Jul 2016, at 12:37, Tom Hale <t...@hale.ee> wrote:

Q1) How do I get feedback on what is actually wrong with my .erb syntax?

Q2) How can I validate that the eventual HTML output is also valid, and not just relying on my browser being tolerant?

I think these could be achieved by having a test suite that covers your views. That could be focussed RSpec style tests, or it could be a higher level test such as you might get from Cucumber.

I've done something similar to this before, when ensuring the HTML was valid was important:

  http://theled.co.uk/blog/archive/2010/07/17/how-we-added-automated-html-validation-to-our-web-development-process/

I'm pretty sure I ran a copy of the W3C validator locally to avoid going to the internet during the tests.

Q3) Do many people use erb in production or should I be using something "better"? Something with a decent error checker? (bonus points for integrating with vim/syntastic)

I'd guess (totally unsubstantiated) that ERB is the most used in production, since it's the default with Rails and there are a lot of older Rails apps still around.

What should you use if you're starting a project now? Talk to your team. Use what they can support and enjoy working in. If you're a team of 1, have a play and see which you prefer. I like ERB because it's the default, it's easy to see the HTML that'll be output, and just about everyone has used it or something similar - even if they're not Rails developers. HAML, Slim, Liquid, these are all good choices depending on your requirements and your team.

Hope that helps.

Cheers,
Craig | http://barkingiguana.com/
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[Ben Koshy]

Hi Tom

I found this gem:

https://github.com/w3c-validators/w3c_validators

The trick would be to integrate it into your view specs. I'm not sure if there's an easy way to do that, but at least there's a place to start.

regards

Ben