CocoViews and CocoModels now notify users of connection errors and automatically retry when getting and putting data goes wrong.

app/models/CocoModel.coffee

@@ -116,6 +116,7 @@ class CocoModel extends Backbone.Model
 
   save: (attrs, options) ->
     options ?= {}
+    originalOptions = _.cloneDeep(options)
     options.headers ?= {}
     options.headers['X-Current-Path'] = document.location?.pathname ? 'unknown'
     success = options.success
@@ -128,6 +129,10 @@ class CocoModel extends Backbone.Model
       CocoModel.pollAchievements()
       options.success = options.error = null  # So the callbacks can be garbage-collected.
     options.error = (model, res) =>
+      if res.status is 0
+        msg = $.i18n.t 'loading_error.connection_failure', defaultValue: 'Connection failed.'
+        noty text: msg, layout: 'center', type: 'error', killer: true, timeout: 3000
+        return _.delay((f = => @save(attrs, originalOptions)), 3000)
       error(@, res) if error
       return unless @notyErrors
       errorMessage = "Error saving #{@get('name') ? @type()}"

app/views/core/CocoView.coffee

@@ -49,6 +49,7 @@ module.exports = class CocoView extends Backbone.View
     @listenTo(@supermodel, 'loaded-all', @onLoaded)
     @listenTo(@supermodel, 'update-progress', @updateProgress)
     @listenTo(@supermodel, 'failed', @onResourceLoadFailed)
+    @warnConnectionError = _.throttle(@warnConnectionError, 3000)
 
     super options
 
@@ -149,6 +150,10 @@ module.exports = class CocoView extends Backbone.View
   # Error handling for loading
   onResourceLoadFailed: (e) ->
     r = e.resource
+    if r.jqxhr?.status is 0
+      @warnConnectionError()
+      return _.delay (=> r.load()), 3000
+        
     @$el.find('.loading-container .errors').append(loadingErrorTemplate({
       status: r.jqxhr?.status
       name: r.name
@@ -157,6 +162,10 @@ module.exports = class CocoView extends Backbone.View
     })).i18n()
     @$el.find('.progress').hide()
 
+  warnConnectionError: ->
+    msg = $.i18n.t 'loading_error.connection_failure', defaultValue: 'Connection failed.'
+    noty text: msg, layout: 'center', type: 'error', killer: true, timeout: 3000
+    
   onRetryResource: (e) ->
     res = @supermodel.getResource($(e.target).data('resource-index'))
     # different views may respond to this call, and not all have the resource to reload