bower_components/iron-list/test/x-list.html

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<link rel="import" href="../../polymer/polymer.html">
<link rel="import" href="../../iron-flex-layout/iron-flex-layout.html">
<link rel="import" href="../iron-list.html">
<dom-module id="x-list">
  <style>
    :host {
      @apply(--layout-fit);
      @apply(--layout-vertical);
      display: block;
    }
    .item {
      color: white;
    }
    .item:nth-child(odd) {
      background-color: green;
    }
    .item:nth-child(even) {
      background-color: red;
    }
  </style>
  <template>
    <iron-list style$="[[_computedListHeight(listHeight)]]" items="[[data]]" as="item" id="list">
      <template>
        <div class="item">
          <div style$="[[_computedItemHeight(item)]]">[[item.index]]</div>
        </div>
      </template>
    </iron-list>
  </template>
</dom-module>
<script>
  Polymer({
    is: 'x-list',
    properties: {
      data: {
        type: Array
      },
      itemHeight: {
        type: Number,
        value: 100
      },
      listHeight: {
        type: Number,
        value: 300
      },
      pre: {
        type: Boolean
      }
    },
    get list() {
      return this.$.list;
    },
    _computedItemHeight: function(item) {
      var css = this.pre ? 'white-space:pre;' : '';
      if (item.height) {
        css += this.itemHeight === 0 ? '' : 'height: ' + (item.height) + 'px;';
      } else if (this.itemHeight) {
        css += 'height: ' + (this.itemHeight) + 'px;';
      }
      return css;
    },
    _computedListHeight: function(listHeight) {
      return 'height: ' + (listHeight) + 'px';
    }
  });
</script>