Ruby on Rails – Send JavaScript variable from controller to external Javascript asset file

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Yes, you can!

Rewrite your JS code into function with one argument (timelimit) and put it into some external file. Then you can call the function from view and pass that @timeleft variable as JS function argument.

Short example:

#controller
@time_left = Time.now.to_i - 3.hours.to_i

.

#javascript
function count_down(time_left) {
  $('#countdown').countdown(time_left)
}

.

#view
<%=javascript_tag "count_down(#{@time_left})" -%>

javascript_tag

Example not tested, it is only idea not complete solution. Don’t forget to load that JS file. You can use other JS rails helper javascript_include_tag.

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