iron-autogrow-textarea

iron-autogrow-textarea is an element containing a textarea that grows in height as more lines of input are entered. Unless an explicit height or the maxRows property is set, it will never scroll.

Example:

<iron-autogrow-textarea id="a1">
  <textarea id="t1"></textarea>
</iron-autogrow-textarea>

Because the textarea's value property is not observable, you should use this element's bind-value instead for imperative updates. Alternatively, if you do set the textarea's value imperatively, you must also call update to notify this element the value has changed.

Example:
    /* preferred, using the example HTML above*/
    a1.bindValue = 'some\ntext';

    /* alternatively, */
    t1.value = 'some\ntext';
    a1.update();