Updated some $attr, $val, and $prop calls.

app/views/account/settings_view.coffee

@@ -77,13 +77,13 @@ module.exports = class SettingsView extends View
   getSubscriptions: ->
     inputs = $('#email-pane input[type="checkbox"]', @$el)
     inputs = ($(i) for i in inputs)
-    subs = (i.attr('name') for i in inputs when i.attr('checked'))
+    subs = (i.attr('name') for i in inputs when i.prop('checked'))
     subs = (s.replace('email_', '') for s in subs)
     subs
 
   toggleEmailSubscriptions: =>
     subs = @getSubscriptions()
-    $('#email-pane input[type="checkbox"]', @$el).attr('checked', not Boolean(subs.length))
+    $('#email-pane input[type="checkbox"]', @$el).prop('checked', not Boolean(subs.length))
     @save()
 
   save: =>

app/views/cla_view.coffee

@@ -5,17 +5,17 @@ template = require 'templates/cla'
 module.exports = class CLAView extends View
   id: "cla-view"
   template: template
-  
+
   events:
     'click #agreement-button': 'onAgree'
-    
+
   getRenderData: ->
     c = super()
     c.signedOn = moment(me.get('signedCLA')).format('LLLL') if me.get('signedCLA')
     c
-    
+
   onAgree: ->
-    @$el.find('#agreement-button').attr('disabled', true).text('Saving')
+    @$el.find('#agreement-button').prop('disabled', true).text('Saving')
     $.ajax({
       url: "/db/user/me/agreeToCLA"
       data: { 'githubUsername': @$el.find('#github-username').val() }
@@ -23,9 +23,9 @@ module.exports = class CLAView extends View
       success: @onAgreeSucceeded
       error: @onAgreeFailed
     })
-    
+
   onAgreeSucceeded: =>
     @$el.find('#agreement-button').text('Success')
 
   onAgreeFailed: =>
-    @$el.find('#agreement-button').text('Failed')
+    @$el.find('#agreement-button').text('Failed')

app/views/contribute_view.coffee

@@ -15,11 +15,11 @@ module.exports = class ContributeView extends View
     _.forEach checkboxes, (el) ->
       el = $(el)
       if el.attr('name') in me.get('emailSubscriptions')
-        el.attr('checked', true)
+        el.prop('checked', true)
 
   onCheckboxChanged: (e) ->
     el = $(e.target)
-    checked = el.attr('checked')
+    checked = el.prop('checked')
     subscription = el.attr('name')
     subscriptions = me.get('emailSubscriptions')
     if checked and not (subscription in subscriptions)

app/views/editor/thang/edit.coffee

@@ -27,10 +27,10 @@ module.exports = class ThangTypeEditView extends View
     'click #upload-button': -> @$el.find('input#real-upload-button').click()
     'change #real-upload-button': 'animationFileChosen'
     'change #animations-select': 'showAnimation'
-    
+
   subscriptions:
     'save-new-version': 'saveNewThangType'
-    
+
   # init / render
 
   constructor: (options, @thangTypeID) ->
@@ -160,7 +160,7 @@ module.exports = class ThangTypeEditView extends View
     @file = e.target.files[0]
     return unless @file
     return unless @file.type is 'text/javascript'
-    @$el.find('#upload-button').val('disabled', true)
+    @$el.find('#upload-button').prop('disabled', true)
     @reader = new FileReader()
     @reader.onload = @onFileLoad
     @reader.readAsText(@file)
@@ -205,7 +205,7 @@ module.exports = class ThangTypeEditView extends View
       movieClip.regX = -reg.x
       movieClip.regY = -reg.y
     @showDisplayObject(movieClip)
-    
+
   getSpriteOptions: -> { resolutionFactor: @resolution, thang: @mockThang}
 
   showSprite: (actionName) ->
@@ -215,14 +215,14 @@ module.exports = class ThangTypeEditView extends View
     @currentSprite?.destroy()
     @currentSprite = sprite
     @showDisplayObject(sprite.displayObject)
-    
+
   updatePortrait: ->
     options = @getSpriteOptions()
     portrait = @thangType.getPortrait(options)
     return unless portrait
     portrait?.attr('id', 'portrait').addClass('img-polaroid')
     $('#portrait').replaceWith(portrait)
-    
+
   showDisplayObject: (displayObject) ->
     @clearDisplayObject()
     displayObject.x = CENTER.x

app/views/kinds/RootView.coffee

@@ -16,7 +16,7 @@ module.exports = class RootView extends CocoView
   events:
     "click #logout-button": "logoutAccount"
     'change .language-dropdown': 'showDiplomatSuggestionModal'
-    
+
   shortcuts:
     'backspace, delete': 'preventBackspace'
 #    'backspace': 'preventBackspace'
@@ -56,7 +56,7 @@ module.exports = class RootView extends CocoView
         code2 isnt code and code2.split('-')[0] is code)
     for code, localeInfo of locale when not (code in genericCodes) or code is preferred
       $select.append(
-        $("<option></option>").attr("value", code).text(localeInfo.nativeDescription))
+        $("<option></option>").val(code).text(localeInfo.nativeDescription))
     $select.val(preferred).fancySelect()
 
   showDiplomatSuggestionModal: ->

app/views/modal/diplomat_suggestion_modal.coffee

@@ -14,6 +14,6 @@ module.exports = class DiplomatSuggestionView extends View
     currentSubscriptions = me.get("emailSubscriptions")
     me.set("emailSubscriptions", currentSubscriptions.concat ["translator"]) if "translator" not in currentSubscriptions
     me.save()
-    $("#email_translator").attr("checked", 1)
+    $("#email_translator").prop("checked", 1)
     @hide()
     return

app/views/modal/signup_modal.coffee

@@ -37,7 +37,7 @@ module.exports = class SignupModalView extends View
     @enableModalInProgress(modal) # TODO: part of forms
 
   checkAge: (e) ->
-    $("#signup-button", @$el).attr 'disabled', not $(e.target).attr('checked')
+    $("#signup-button", @$el).prop 'disabled', not $(e.target).prop('checked')
 
   createAccount: (e) =>
     forms.clearFormAlerts(@$el)
@@ -46,7 +46,7 @@ module.exports = class SignupModalView extends View
     delete userObject["confirm-age"]
     for key, val of me.attributes when key in ["preferredLanguage", "testGroupNumber", "dateCreated", "wizardColor1", "name", "music", "volume"]
       userObject[key] ?= val
-    subscribe = @$el.find('#signup-subscribe').attr('checked')
+    subscribe = @$el.find('#signup-subscribe').prop('checked')
     userObject.emailSubscriptions = if subscribe then ['announcement'] else []
     res = tv4.validateMultiple userObject, User.schema.attributes
     return forms.applyErrorsToForm(@$el, res.errors) unless res.valid

app/views/play/level/modal/multiplayer_modal.coffee

@@ -8,7 +8,7 @@ module.exports = class MultiplayerModal extends View
   events:
     'click textarea': 'onClickLink'
     'change #multiplayer': 'updateLinkSection'
-  
+
   constructor: (options) ->
     super(options)
     @session = options.session
@@ -21,19 +21,20 @@ module.exports = class MultiplayerModal extends View
       @session.id)
     c.multiplayer = @session.get('multiplayer')
     c
-  
+
   afterRender: ->
     super()
     @updateLinkSection()
-    
+
   onClickLink: (e) =>
     e.target.select()
-    
+
   updateLinkSection: =>
-    multiplayer = @$el.find('#multiplayer').attr('checked')
+    multiplayer = @$el.find('#multiplayer').prop('checked')
     la = @$el.find('#link-area')
     if multiplayer then la.show() else la.hide()
+    true
 
   onHidden: ->
-    multiplayer = Boolean(@$el.find('#multiplayer').attr('checked'))
+    multiplayer = Boolean(@$el.find('#multiplayer').prop('checked'))
-    @session.set('multiplayer', multiplayer)
+    @session.set('multiplayer', multiplayer)

app/views/play/level/tome/cast_button_view.coffee

@@ -73,7 +73,7 @@ module.exports = class CastButtonView extends View
     else
       s = $.i18n.t("play_level.tome_cast_button_cast", defaultValue: "Spell Cast")
     @castButton.text s
-    @castButton.attr 'disabled', not castable
+    @castButton.prop 'disabled', not castable
 
   setAutocastDelay: (delay) ->
     #console.log "Set autocast delay to", delay

app/views/play/level/tome/spell_list_entry_view.coffee

@@ -95,4 +95,4 @@ module.exports = class SpellListEntryView extends View
     disabled = not enabled
     # Should refactor the disabling list so we can target the spell list separately?
     # Should not call it 'editor' any more?
-    @$el.toggleClass('disabled', disabled).find('*').attr('disabled', disabled)
+    @$el.toggleClass('disabled', disabled).find('*').prop('disabled', disabled)

app/views/play/level_view.coffee

@@ -353,7 +353,7 @@ module.exports = class PlayLevelView extends View
     # Need to set this team stuff before the Tome loads... let's think about this with Scott.
     #@setTeam @world.teamForPlayer(@bus.countPlayers()) unless me.team
     #$('#multiplayer-team-selection').toggle(@world.playableTeams.length > 1)
-    #  .find('input').attr('checked', -> $(@).val() is me.team)
+    #  .find('input').prop('checked', -> $(@).val() is me.team)
     #  .bind('change', @setTeam)
 
   onSessionWillSave: (e) ->