Rails 3: Instance variable inaccessible in .js.erb file -
i'm trying build simple page, need generate dynamic javascript photo gallery. intuitively simple, i'm struggling greatly. in controller building list of photo @photos, need iterate out javascript each photo in photo.js.erb file.
however, whenever reach .js.erb file, @photos variable becomes nil... missing?
controllers/photos_controller.rb file:
class photoscontroller < applicationcontroller layout "application_photos" def category @photos = ...(generates collection of photos)... end end views/photos/category.html.haml file:
= content_for :head // @photos still initialized @ point = javascript_include_tag "photos" // partial loads more markup, it's inconsequential. = render :partial => 'default_slideshow' javascripts/photos.js.erb file:
jquery(function($){ // throws nilclass error <% puts 'photos: ' + @photos %> }); i know question has been asked dozen times, none of accepted answers worked me. suggestions appreciated.
you need send js request server in order have access instance variable. this
$(function($){ $.ajax({ type: "get", url: "..." }) }); in views/photos/category.js.erb file:
alert("<%= j @photos %>") or can same using gon gem.
app/views/layouts/application.html.erb
<head> <title>some title</title> <%= include_gon %> <!-- include action js code --> ... you put in action of controller:
@your_int = 123 @your_array = [1,2] @your_hash = {'a' => 1, 'b' => 2} gon.your_int = @your_int gon.your_other_int = 345 + gon.your_int gon.your_array = @your_array gon.your_array << gon.your_int gon.your_hash = @your_hash gon.all_variables # > {:your_int => 123, :your_other_int => 468, :your_array => [1, 2, 123], :your_hash => {'a' => 1, 'b' => 2}} gon.your_array # > [1, 2, 123] gon.clear # gon.all_variables {} access varaibles javascript file:
alert(gon.your_int) alert(gon.your_other_int) alert(gon.your_array) alert(gon.your_hash) hope helps
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