How to pass a javascript variable into a erb code in a js view?

Question

I have this Javascript view in my Rails 3 project:

app/views/expenses/new_daily.js.erb

var i = parseInt($(\'#daily\').attr(\'data-num\')) + 1;
//$(\'         


        

Answer 1

Simple answer is you can't. Partials are expanded at server side, and JavaScript variables are set later at client side. You could make i (as a variable name) a parameter of the partial and use it there.

render :partial => 'xx', :locals => { :variable => 'i' }

And in partial

alert(<%= variable %>);