Duplicate jQuery library when using Rails Assets

Question

I like to include bower, node packages in my Rails app using Rails Assets:

source 'https://rails-assets.org' do
  gem 'rails-assets-colorbox'
end

# ...

gem 'jquery-rails'

Now when I did run bundle install I got the following output:

...
Using pg 0.18.1
Installing rails-assets-jquery 2.1.3
Installing rails-assets-colorbox 1.6.0
Using ruby-graphviz 1.0.9
...

Now I am already using the jquery-rails plugin which is obviously a wrapper of jquery but which, I believe, does more advanced rails-related stuff too.

So now I seem to have two versions of jquery in my Rails app which is not ideal.

My questions is now whether I can get rid of jquery-rails and just include rails-assets-jquery in my Gemfile

Ronak Jain · Accepted Answer · 2015-03-26 10:55:33Z

1

If you are not using jquery-ujs, you may not use the gem jquery-rails at all.

jquery-ujs wires event handlers to eligible DOM elements to provide enhanced functionality. In most cases, the eligible DOM elements are identified by HTML5 data attributes.

For example, If you have a HTML form, and if you want to submit your HTML form in a Ajax way (instead of a pageload), you'd have to add :remote=>true attribute in to your form_for. Your controller, now can respond to the ajax request, that could be a HTML Embed. This would help you to improve user experience, while still keeping the client-side js light.

jquery-ujs would fire events that you could handle, for example ajax:success ajax:error.

If you are new to rails, try going to this walk through.

You may also prefer to include jQuery using CDN, if you only want to use jQuery but not jquery-ujs. Its more efficient.

edited Mar 26, 2015 at 10:55

answered Mar 26, 2015 at 9:08

Ronak Jain

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1 Comment

Besi Over a year ago

can you explain why jquery-ujs makes the difference?

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