disable adding feed while processing

app/js/classes/feeds.coffee

@@ -5,6 +5,7 @@ app = @App
 @App.FeedsController = Ember.ArrayController.extend
 	newFeedUrl: null
 	urlPrompt: false
+	isProcessing: false
 	selectFeed: (feed)->
 		@get('content').forEach( (i)->
 			i.set('selected', false)
@@ -25,9 +26,8 @@ app = @App
 	# 	)
 
 
-@App.FeedsView = Ember.View.extend {
+@App.FeedsView = Ember.View.extend
 	classNames: ['inmiddle']
-}
 
 @App.NewFeedView = Ember.View.extend
 	click: ->
@@ -40,25 +40,29 @@ app = @App
 	keyUp: (e)->
 		url = @get('controller.newFeedUrl')
 		view = @
-		if e.keyCode == 13 && !!url
-			$.post( '/v1/feeds', {url: url} ).done (json)->
+		if e.keyCode == 13 && !!url && !@get('isProcessing')
+			@set('isProcessing', true)
+			@$('input').attr('disabled', true)
+			$.post( '/v1/feeds', {url: url} ).done (json)=>
+				json = JSON.parse(json)
+				$.get( 'v1/feeds/' + json.id ).done (json)=>
+					@set('isProcessing', false)
+					@$('input').attr('disabled', false)
 					json = JSON.parse(json)
-					$.get( 'v1/feeds/' + json.id ).done (json)->
-						json = JSON.parse(json)
-						items = json.feed.items.map((i)->
-							o = Ember.Object.create().setProperties(i)
-							o.set('selected', false)
-						)
-						feed = Ember.Object.create {
-							title: json.feed.title
-							url: url
-							created_at: new Date()
-							items: items
-							selected: false
-						}
-						view.get('controller.content').pushObject( feed )
-						view.set('controller.urlPrompt', false)
-						view.set('controller.newFeedUrl', null)
+					items = json.feed.items.map((i)->
+						o = Ember.Object.create().setProperties(i)
+						o.set('selected', false)
+					)
+					feed = Ember.Object.create {
+						title: json.feed.title
+						url: url
+						created_at: new Date()
+						items: items
+						selected: false
+					}
+					view.get('controller.content').pushObject( feed )
+					view.set('controller.urlPrompt', false)
+					view.set('controller.newFeedUrl', null)
 
 		# if e.keyCode == 13 && !!url
 		# 	@get('controller').newFeed {"url": encodeURIComponent(url)}