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Computed Binding with Polymer

Asked By: Anonymous

This is an excerpt of my codes:

<template is="dom-bind">
  <iron-ajax auto
    url="####"
    params=""
    handle-as="json"
    last-response="{{ajaxResponse}}"></iron-ajax>
    <template is="dom-repeat" items="[[ajaxResponse.Items]]">
      <div>                                                
        [[_formatDate(item.ID.N)]]
      </div>                                        
    </template>
 </template>
 ...
 <script>
    Polymer({
        is: 'home-view',
        _formatDate: function(ID) {
            console.log("TEST");
            return "TEST";
        }
    });
</script>

I am getting this Console Warning:

[Warning] [dom-bind::_annotatedComputationEffect]: – "compute method `_formatDate` not defined" (data:text/javascript;charset=utf-8,(fu…%0A, line 265, x10)

So it seems that I do not know how to define _formatDate correctly so that it is recognized by Polymer. Can someone please help?


Solution

Answered By: Anonymous

It looks like you’re correctly declaring and using _formatDate().

The warning comes from dom-bind, which is intended only for bindings in index.html, not inside dom-module. You should remove the is="dom-bind" from your top template.

_x000D_

_x000D_

<head>_x000D_
  <base href="https://polygit.org/polymer+1.6.0/components/">_x000D_
  <a href="http://webcomponentsjs/webcomponents-lite.min.js">http://webcomponentsjs/webcomponents-lite.min.js</a>_x000D_
  <link rel="import" href="polymer/polymer.html">_x000D_
</head>_x000D_
_x000D_
<body>_x000D_
  <home-view></home-view>_x000D_
_x000D_
  <dom-module id="home-view">_x000D_
    <template>_x000D_
      <template is="dom-repeat" items="[[items]]">_x000D_
        <div>[[_formatDate(item)]]</div>_x000D_
      </template>_x000D_
    </template>_x000D_
    <script>_x000D_
      // For cross-browser compatibility, HTMLImports.whenReady()_x000D_
      // needed in index.html only_x000D_
      HTMLImports.whenReady(function() {_x000D_
        Polymer({_x000D_
          is: 'home-view',_x000D_
          properties: {_x000D_
            items: {_x000D_
              type: Array,_x000D_
              value: function() { return ['hello', 'world']; }_x000D_
            }_x000D_
          },_x000D_
          _formatDate: function(id) {_x000D_
            console.log('id', id);_x000D_
            return id;_x000D_
          }_x000D_
        });_x000D_
      });_x000D_
    </script>_x000D_
  </dom-module>_x000D_
</body>

_x000D_

_x000D_

x000D

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