Ruby on Rails

> On Jul 10, 2016, at 8:43 AM, 'krfg' via Ruby on Rails: Talk <rubyonrails-talk@googlegroups.com> wrote:
>
> The default setting in my application.html.erb is:
>
> <%= stylesheet_link_tag 'application', media: 'all', 'data-turbolinks-track': 'true' %>
> <%= javascript_include_tag 'application', 'data-turbolinks-track': 'true' %>
>
> I have a cusom.css.scss file in app/assets/stylesheets which is included as part of the application.css file included in the site layout, supposedly because of the
> stylesheet_link_tag 'application' line of code.
> I therefore planned to put all the javascript (jQuery and bootstrap) for my application in custom.js inside app/assets/javascript.
> Would rails automatically load this file or am I expected to explicitly tell rails to load it?
>
> What confuses me is that in the Ruby on Rails tutorial, when jQuery is used, it is put inside the html.erb document, like in Chapter 13, so that on the one hand it is used a custom.css.scss file as stylesheet, on the other hand, when javascript is required, it is inserted inside the html.erb document.

If you use jQuery, you have to guarantee that it loads before you rely on it. Load tree (the directive in the last line of application.js) loads the app/assets/javascripts folder, as well as the vendor/assets/javascripts folder, and any scripts declared by Gems, in filesystem order. I don't know the order of operations here off the top of my head, but it seems likely that you would have a hard time guaranteeing that jQuery was loaded before your script tried to use it, particularly if your script name started with an i or lower letter.

Walter

>
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