systrace/catapult/third_party/polymer/components/app-route/demo/data-loading-demo/flickr-image-page.html

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@license
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This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
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<link rel="import" href="../../../polymer/polymer.html">
<link rel="import" href="../../../iron-ajax/iron-ajax.html">
<link rel="import" href="../../../paper-spinner/paper-spinner.html">
<link rel="import" href="../../app-route.html">

<dom-module id="flickr-image-page">
  <template>
    <style>
      paper-spinner {
        display: block;
      }
      .tags span {
        display: inline-block;
        padding-right: 10px;
        font-size: 110%;
      }
      .tags span::after {
        content: ', ';
      }
      .tags span:last-of-type::after {
        content: '';
      }
    </style>
    <app-route route="{{route}}" pattern="/:farm/:server/:id/:secret" data="{{data}}">
    </app-route>
    <img src="{{_computeSrc(data)}}">
    <iron-ajax auto url="https://www.flickr.com/services/rest/"
               handle-as="json"
               params="{{params}}"
               last-response="{{metadata}}"
               last-error="{{error}}"
               loading="{{loading}}">
    </iron-ajax>
    <paper-spinner active="{{loading}}"></paper-spinner>
    <div>
      <h1>{{metadata.photo.title._content}}</h1>
      <div class="tags">
      <template is="dom-repeat" items="{{metadata.photo.tags.tag}}">
        <span>{{item.raw}}</span>
      </template>
      </div>
      <div>
        <ul>
          <template is="dom-repeat" items="{{metadata.photo.urls.url}}">
            <li>
              <a target="_blank" href="{{item._content}}">
                {{item._content}}
              </a>
            </li>
          </template>
        </ul>
      </div>
    </div>
  </template>
  <script>
    Polymer({
      is: 'flickr-image-page',
      properties: {
        apiKey: {
          type: String,
        },

        params: {
          type: Object,
          computed: '_computeParams(apiKey, data.id, data.secret)'
        }

      },
      observers: [
        '_clearOldMetadata(route.path)'
      ],

      _clearOldMetadata: function() {
        this.metadata = null;
      },

      _computeParams: function(apiKey, id, secret) {
        return {
          method: 'flickr.photos.getInfo',
          api_key: apiKey,
          photo_id: id,
          secret: secret,
          format: 'json',
          nojsoncallback: 1
        };
      },

      _computeSrc: function(photo) {
        if (!photo || !photo.farm) {
          return '';
        }
        return 'https://farm' + photo.farm + '.staticflickr.com/' +
            photo.server + '/' + photo.id + '_' + photo.secret + '.jpg';
      }
    });
  </script>
</dom-module>