joakimk · February 17, 2012 10:40 · Feb 17, 2012
diff --git a/controller.rb b/controller.rb
@@ -0,0 +1,17 @@
+class Controller
+  include LazyLoad
+
+  def show
+    @model = Model.find(...)
+
+    respond_to do |format|
+      format.html do
+        @html_specific_data = Model.find(...)
+      end
+
+      render_lazy_load(format) do
+        @lazy_specific_data = Model.find(...)
+      end
+    end
+  end
+end
diff --git a/helper.rb b/helper.rb
@@ -0,0 +1,13 @@
+module Helper
+
+  def lazy_render(name)
+    content_tag :div, :id => "lazy-loaded-#{name}" do
+      content_tag :div, :class => "spinner" do
+        content_tag(:script) do
+          "if(!window.lazyLoads) { window.lazyLoads = []; }; window.lazyLoads.push('#{name}');".html_safe
+        end
+      end
+    end
+  end
+
+end
diff --git a/lazy_load.rb b/lazy_load.rb
@@ -0,0 +1,11 @@
+module LazyLoad
+  def render_lazy_load(format, &block)
+    format.js do
+      block.call if block
+      render json: {
+        lazy_load_partial: params[:lazy_load_partial],
+        body: render_to_string(:partial => params[:lazy_load_partial])
+      }
+    end
+  end
+end
diff --git a/script.coffee b/script.coffee
@@ -0,0 +1,5 @@
+if window.lazyLoads
+  for lazyLoad in window.lazyLoads
+    url = window.location.href + "?format=js&lazy_load_partial=#{lazyLoad}"
+    $.ajax url: url, dataType: "json", success: (data) ->
+      $("#lazy-loaded-#{data.lazy_load_partial}").html(data.body)
diff --git a/view.html.haml b/view.html.haml
@@ -0,0 +1,5 @@
+= render 'foobar'
+
+becomes
+
+= lazy_render 'foobar'
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