title: how to getvalue of textarea in react?
body: <p>I am using <code>react-final-form</code> and <code>TextareaAutosize</code>in my example .I am trying to get the value of <code>text-area</code> but not able to do that.
  I am able to get value of <code>input</code> field but not <code>textarea</code></p>
  
  <p>here is my code
  <a href="https://codesandbox.io/s/react-final-form-simple-example-rd3rc" rel="nofollow noreferrer">https://codesandbox.io/s/react-final-form-simple-example-rd3rc</a></p>
  
  <pre><code> &lt;div&gt;
              &lt;label&gt;Text area Name&lt;/label&gt;
              &lt;Field
                component={TextareaAutosize}
                type="textarea"
                name="operatingPinCode"
                placeholder="Notes"
                label="About"
              /&gt;
            &lt;/div&gt;
  </code></pre>
  
  <p>API link
  <a href="https://final-form.org/docs/react-final-form/examples/simple" rel="nofollow noreferrer">https://final-form.org/docs/react-final-form/examples/simple</a></p>
  
  <p><a href="https://www.npmjs.com/package/react-textarea-autosize" rel="nofollow noreferrer">https://www.npmjs.com/package/react-textarea-autosize</a></p>