cats-only.html

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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-validator-behavior/iron-validator-behavior.html">

<script>

  class CatsOnlyValidator extends Polymer.mixinBehaviors(
    [Polymer.IronValidatorBehavior], Polymer.Element
  ) {

    static get is() { return 'cats-only'; }

    validateObject(obj) {
      var valid = true;
      for (key in obj) {
        if (obj[key] !== 'cats') {
          valid = false;
          break;
        }
      }
      return valid;
    }

    validate(values) {
      if (typeof values === 'object') {
        return this.validateObject(values);
      } else {
        var value = Array.isArray(values) ? values.join('') : values;
        return value.match(/^(c|ca|cat|cats)?$/) !== null;
      }
    }

  }

  window.customElements.define(CatsOnlyValidator.is, CatsOnlyValidator)

</script>