Textarea that grows in height as more lines of input are entered

Published on NPM Build status Published on webcomponents.org


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.

See: Documentation, Demo.



npm install --save @polymer/iron-autogrow-textarea

In an html file

    <script type="module">
      import '@polymer/iron-autogrow-textarea/iron-autogrow-textarea.js';

In a Polymer 3 element

import {PolymerElement, html} from '@polymer/polymer';
import '@polymer/iron-autogrow-textarea/iron-autogrow-textarea.js';

class SampleElement extends PolymerElement {
  static get template() {
    return html`
customElements.define('sample-element', SampleElement);


If you want to send a PR to this element, here are the instructions for running the tests and demo locally:


git clone https://github.com/PolymerElements/iron-autogrow-textarea
cd iron-autogrow-textarea
npm install
npm install -g polymer-cli

Running the demo locally

polymer serve --npm

Running the tests

polymer test --npm


Link to this version
ImportedReleased 14 September 2018BSD 3-clause "New" or "Revised" License
Framework Support
Polymer 1.0+
Polymer 3.0+
Also supported:
Polymer 2 (2.2.0)
Browser Compatibility
Install with
npm install @polymer/iron-autogrow-textarea"@3.0.1"
Run the above npm command in your project folder. If you have any issues installing, please contact the author.
Release notes - Version 3.0.1


  • @polymer/iron-behaviors#^3.0.0-pre.26
  • @polymer/iron-flex-layout#^3.0.0-pre.26
  • @polymer/iron-validatable-behavior#^3.0.0-pre.26
  • @polymer/polymer#^3.0.0