Rails 4 - how to install "jquery-ui"?

javascript jquery ruby-on-rails ruby jquery-ui

In application.css it should be

 *= require jquery-ui

javascript jquery ruby-on-rails ruby jquery-ui

In application.js you need to add:

//= require jquery.ui.all

or for specific components e.g.

//= require jquery.ui.sortable

javascript jquery ruby-on-rails ruby jquery-ui

To update this answer, the current convention is:

//= require jquery-ui

and for css:

/**= require jquery-ui*/

for specific modules:

//= require jquery-ui/draggable

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