react-textarea-autosize
Drop-in replacement for the textarea component which automatically resizes textarea as content changes. A native React version of the popular jQuery Autosize! Weighs around 1.3KB (minified & gzipped).
This module supports IE9 and above.
import TextareaAutosize from 'react-textarea-autosize';
// If you use CommonJS syntax:
// var TextareaAutosize = require('react-textarea-autosize').default;
React.renderComponent(
<div>
<TextareaAutosize />
</div>,
document.getElementById('element'),
);
Install
npm install react-textarea-autosize
Demo
https://andarist.github.io/react-textarea-autosize/
Props
Special props:
| prop | type | description |
|---|---|---|
maxRows |
number |
Maximum number of rows upto which the textarea can grow |
minRows |
number |
Minimum number of rows to show for textarea |
onHeightChange |
func |
Function invoked on textarea height change, with height as first argument |
cacheMeasurements |
boolean |
Reuse previously computed measurements when computing height of textarea. Default: false |
Apart from these, the component accepts all props that are accepted by <textarea/>, like style, onChange, value, etc.
FAQ
How to focus
Get a ref to inner textarea:
<TextareaAutosize ref={(tag) => (this.textarea = tag)} />
And then call a focus on that ref:
this.textarea.focus();
To autofocus:
<TextareaAutosize autoFocus />
(all HTML attributes are passed to inner textarea)
How to test it with jest and react-test-renderer if you need ref
Because jest provides polyfills for DOM objects by requiring jsdom and react-test-renderer doesn't provide refs for rendered components out of the box (calling ref callbacks with null), you need to supply a mocked ref in your tests in you need it for your tests. You can do it like this (more can be read here):
const tree = renderer
.create(<TextareaAutosize />, {
createNodeMock: () => document.createElement('textarea'),
})
.toJSON();
