作为更大的 Ruby on Rails 项目的一部分，我如何有条件地在 html.slim 文件中包含一些 Javascript？

Question

I want my page to render some Javascript, conditional on a variable from the Rails environment. I must have everything in this one file, because of other build tooling constraints.

Eseentially I am trying to get this working:

= javascript:
     console.log('My javascript goes in this area....');
     <% if myCondition %>
          console.log('Render the JS in here is myCondition is true')
     <%end>

However, when I try this, I get errors that < is not a valid character.

Answer 1

 javascript:
   console.log('My javascript goes in this area....');

 - if myCondition
   javascript:
      console.log('Render the JS in here is myCondition is true')

Also, this question might be useful: ruby inside javascript block [slim template]

Answer 2

you cannot use <%... %> in your javascript

If you want to use rails data, try ei

var form_id = "form"+ #{{@product.id.to_json}};

Another way, you should be use ajax( it was mean your_action.js.slim ), see ie bellow

create.js.slim

- if @product.errors.present?
  | toastr["error"]("#{@product.errors.full_messages[0]}");
- else
  | toastr["success"]("Created successfully!");