systrace/catapult/third_party/polymer/components/iron-form/demo/cats-only.html

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<link rel="import" href="../../polymer/polymer.html">
<link rel="import" href="../../iron-validatable-behavior/iron-validatable-behavior.html">

<dom-module id="cats-only">
  <template>
    <style>
      :host {
        display: inline-block;
      }
      input {
        width: 250px;
      }
      :host([invalid]) input {
        border-color: red;
      }
    </style>
    <input value="{{value}}" id="input" placeholder="Type 'cats' to prove you like cats">
  </template>
</dom-module>

<script>

  Polymer({
    is: 'cats-only',

    properties: {
      value: {
        type: String
      },

      name: {
        type: String
      }
    },

    behaviors: [
      Polymer.IronValidatableBehavior
    ],

    listeners: {
      'input': '_onInput'
    },

    _onInput: function() {
      this.value = this.$.input.value;
    },

    // Overidden from Polymer.IronValidatableBehavior. Will set the `invalid`
    // attribute automatically, which should be used for styling.
    _getValidity: function() {
      return this.value === 'cats';
    }

  });

</script>