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third_party/polymer/components/paper-input/paper-input-char-counter.html

 <!--
 @license
 Copyright (c) 2015 The Polymer Project Authors. All rights reserved.
 This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
 The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
 The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
 Code distributed by Google as part of the polymer project is also
 subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
 -->
 
@@ skipping 23 matching lines @@
   <template>
     <style>
       :host {
         display: inline-block;
         float: right;
 
         @apply(--paper-font-caption);
         @apply(--paper-input-char-counter);
       }
 
+      :host([hidden]) {
+        display: none !important;
+      }
+
       :host-context([dir="rtl"]) {
         float: left;
       }
     </style>
 
     <span>[[_charCounterStr]]</span>
   </template>
 </dom-module>
 
 <script>
@@ skipping 22 matching lines @@
      *     value: The input value.
      *     invalid: True if the input value is invalid.
      */
     update: function(state) {
       if (!state.inputElement) {
         return;
       }
 
       state.value = state.value || '';
 
-      var counter = state.value.length.toString();
+      var counter = state.value.toString().length.toString();
 
       if (state.inputElement.hasAttribute('maxlength')) {
         counter += '/' + state.inputElement.getAttribute('maxlength');
       }
 
       this._charCounterStr = counter;
     }
   });
 </script>