paper-textarea.html

<!--
@license
Copyright (c) 2015 The Polymer Project Authors. All rights reserved.
This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
Code distributed by Google as part of the polymer project is also
subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
-->
<link rel="import" href="../polymer/polymer.html">
<link rel="import" href="../iron-autogrow-textarea/iron-autogrow-textarea.html">
<link rel="import" href="../iron-form-element-behavior/iron-form-element-behavior.html">
<link rel="import" href="paper-input-behavior.html">
<link rel="import" href="paper-input-container.html">
<link rel="import" href="paper-input-error.html">
<link rel="import" href="paper-input-char-counter.html">

<!--
`<paper-textarea>` is a multi-line text field with Material Design styling.

    <paper-textarea label="Textarea label"></paper-textarea>

See `Polymer.PaperInputBehavior` for more API docs.

### Validation

Currently only `required` and `maxlength` validation is supported.

### Styling

See `Polymer.PaperInputContainer` for a list of custom properties used to
style this element.
-->

<dom-module id="paper-textarea">
  <template>

    <paper-input-container no-label-float$="[[noLabelFloat]]" auto-validate$="[[autoValidate]]" disabled$="[[disabled]]" invalid="[[invalid]]">

      <label hidden$="[[!label]]">[[label]]</label>

      <iron-autogrow-textarea id="input" class="paper-input-input"
        bind-value="{{value}}"
        required$="[[required]]"
        maxlength$="[[maxlength]]"></iron-autogrow-textarea>

      <template is="dom-if" if="[[errorMessage]]">
        <paper-input-error>[[errorMessage]]</paper-input-error>
      </template>

      <template is="dom-if" if="[[charCounter]]">
        <paper-input-char-counter></paper-input-char-counter>
      </template>

    </paper-input-container>

  </template>

</dom-module>

<script>

(function() {

  Polymer({

    is: 'paper-textarea',

    behaviors: [
      Polymer.PaperInputBehavior,
      Polymer.IronFormElementBehavior
    ],

    properties: {

      _ariaLabelledBy: {
        observer: '_ariaLabelledByChanged',
        type: String
      },

      _ariaDescribedBy: {
        observer: '_ariaDescribedByChanged',
        type: String
      }

    },

    _ariaLabelledByChanged: function(ariaLabelledBy) {
      this.$.input.textarea.setAttribute('aria-labelledby', ariaLabelledBy);
    },

    _ariaDescribedByChanged: function(ariaDescribedBy) {
      this.$.input.textarea.setAttribute('aria-describedby', ariaDescribedBy);
    }

  });

})();

</script>