load previous favorite page if page empty

app/views/favorites/_job.html.erb

-<div id="favorited-<%= job.id %>">
+<div id="favorited-<%= job.id %>" class="form-item">
   <div class='card flex-md-row align-items-center my-2 p-2'>
     <%= radio_button_tag :job_id, job.id %>
     <%= render 'shared/job_body', job: job %>

app/views/favorites/destroy.js.erb

@@ -2,3 +2,13 @@ $('#favorite-<%= @favorite.job_id %>')
   .html("<%= j render 'favorites/link_favorite', job_id: @favorite.job_id %>")
 $('#sum-favorited').html("<%= current_user.favorites.size %>")
 $('#favorited-<%= @favorite.job_id %>').remove()
+var num_child = $('.form-group .form-item').length
+if (num_child == 0) {
+  var prev = $('a[rel=prev]')
+  if (prev.length > 0) {
+    window.location = prev.attr('href')
+  }
+  else {
+    window.location = '<%= favorites_path %>'
+  }
+}

app/views/favorites/index.html.erb

@@ -4,7 +4,7 @@
   <div class='content'>
     <% if @jobs.any? %>
       <%= paginate @jobs %>
-      <%= form_tag new_applied_job_path, method: :get, enforce_utf8: false do %>
+      <%= form_tag new_applied_job_path, method: :get, enforce_utf8: false, class: 'form-group' do %>
         <%= render partial: 'favorites/job', collection: @jobs %>
         <div class="actions text-center">
           <%= submit_tag 'Apply Now', name: nil, class: 'btn btn-outline-success btn-lg' %>