prevent double-click on create performer and create composition links

app/assets/javascripts/performances.js.coffee

@@ -1,9 +1,10 @@
 # Place all the behaviors and hooks related to the matching controller here.
 # All this logic will automatically be available in application.js.
 # You can use CoffeeScript in this file: http://jashkenas.github.com/coffee-script/
-$(document).ready ->
-  $(".chzn-select").chosen()
-  $("#create_performer_link").on 'click', ->
+
+createPerformerLink = ->
+  $("#create_performer_link").one "click", (event) ->
+    event.preventDefault()
     $("#performer_fields").append("<label for='performance_performer_attributes_Name'>Performer Name</label>")
     $("#performer_fields").append("<input id='performance_performer_attributes_canonical_name' name='performance[performer_attributes][canonical_name]' size='30' type='text'>")
     $("#performer_fields").append("<input name='performance[performer_attributes][person_type]' type='hidden' value='performer'>")
@@ -12,12 +13,22 @@ $(document).ready ->
     $("#remove_performer").on 'click', ->
       $("#performer_fields").empty()
       $("#create_performer").show()
+      createPerformerLink()
 
-  $("#create_composition_link").on 'click', ->
+createCompositionLink = ->
+  $("#create_composition_link").one "click", (event) ->
+    event.preventDefault()
     $.get('/admin/new_composition_ajax', (data) ->
       $('#composition_fields').append(data)
       $("#composition_fields").append("<a id='remove_composition' href='javascript:void(0'>Cancel</a>")
       $("#create_composition").hide()
       $("#remove_composition").on 'click', ->
         $("#composition_fields").empty()
-        $("#create_composition").show())
+        $("#create_composition").show()
+        createCompositionLink()
+    )
+
+$(document).ready ->
+  $(".chzn-select").chosen()
+  createPerformerLink()
+  createCompositionLink()