Is it possible to use .js.erb file in Rails 6?-CodePudding

I have the following in app/javascripts/custom/test.js.erb

export function test(){
  alert('<%= 5 %>');
}

But the ERB is not interpreted.

Is it possible to use js.erb like this in Rails 6?

CodePudding user response：

It's possible, but you need to make sure that your file is included in the assets pipeline and that it's loaded in your view.

I tested the following example on Rails 6.1:

# in config/initializers/assets.rb
Rails.application.config.assets.precompile  = %w[application.js]

# in app/views/layouts/application.html.erb
<%= javascript_include_tag 'application' %>

# in app/assets/javascripts/application.js
//= require_tree .

# in app/assets/javascripts/test.js.erb
alert('<%= 5 %>');

CodePudding user response：

You can also use js.erb in webpacker, you would need to install a new package rails-erb-loader and also need to configure the webpack loaders.

But no need to worry, webpacker provides built-in rake command to install required packages and configure webpack loaders.

Use:

bundle exec rails webpacker:install:erb

Now just import app/javascripts/custom/test.js.erb to app/javascript/packs/application.js (packs entry point file). And you are all set!

// app/javascript/packs/application.js

import Rails from "@rails/ujs"
import Turbolinks from "turbolinks"
import * as ActiveStorage from "@rails/activestorage"
import "channels"

Rails.start()
Turbolinks.start()
ActiveStorage.start()

import '../custom/test.js.erb';