ruby inside javascript block [slim template]

Question

There is a way to put ruby conditions inside javascript block? i.e.

javascript:   var config = {       common_value_1 : 1,        common_value_2 : 2    };   - if my_value === true # this must be a ruby condition     config.custom_true_value_1 = "1" ;     config.custom_true_value_2 = "#{my_value}" ;   - else     config.custom_false_value_1 = "1" ;     config.custom_false_value_2 = "#{my_value}" ; 

Or is there another workaround at this problem? Because the ugly way that I can use its:

javascript:     var config = {       common_value_1 : 1,        common_value_2 : 2      }; - if my_value === true # this must be a ruby condition   javascript:     config.custom_true_value_1 = "1" ;     config.custom_true_value_2 = "#{my_value}" ; - else   javascript:     config.custom_false_value_1 = "1" ;     config.custom_false_value_2 = "#{my_value}" ; 

But I don't like it because if config has common values between if and else then I would duplicate my code and would be much larger and hard to maintain.

Updated with better examples

Answer 1

You can use a style similar to string interpolation. See example below.

javascript:   var config = {      custom: "#{my_value ? 'truthy' : 'falsy'}",     current_user: #{raw current_user.to_json}   }; 

** Update below **

If you want more advanced configuration I would recommend to create a class, for example

class ClientConfig   attr_accessor :foo, :bar    # .. code    def to_json     { foo: foo, bar: bar }.to_json   end end  # in view file javascript:    var config = ClientConfig.new.to_json 

Else you also have the opportunity to create a ruby partial I've created an example below who may not be so beautiful but I works.

# template_path/_config.html.ruby def configuration   { foo: "Hello", bar: "World" } end  def july_special   { june_key: "It's June" } end  def month_name   Date.today.strftime("%B") end  config = month_name == 'July' ? configuration.merge(july_special) : configuration  content_tag :script, config.to_json.html_safe  # viewfile = render 'template_path/config' 

So my point is that there are multiple ways of doing this and you should try to find the way the one that suits you and your application the most. In my case, I would use my first example (before the update) if I just need one or two values else I would go for the class ClientConfig.

Answer 2

In pure Slim you don't have raw nor html_safe. In those cases, simply use double curly braces as documented here:

javascript:   var data = #{{ JSON.dump([{x: 1, y:2}]) }};