react-height

Component-wrapper to determine and report children elements height

Goals

• react-height keeps things simple, therefore it does not support nested height change, it only checks immediate children change
• not based on specific browser APIs, so can be used in other environments too
• used as backend for react-collapse

Installation

NPM

npm install --save react react-height

Don't forget to manually install peer dependencies (react) if you use npm@3.

1998 Script Tag:

<script src="https://unpkg.com/react/dist/react.js"></script>
<script src="https://unpkg.com/react-height/build/react-height.min.js"></script>
(Module exposed as `ReactHeight`)

Demo

http://nkbt.github.io/react-height/example

Codepen demo

http://codepen.io/nkbt/pen/NGzgGb

Usage

import {ReactHeight} from 'react-height';

<ReactHeight onHeightReady={height => console.log(height)}>
  <div>Random content</div>
</ReactHeight>

Options

onHeightReady: PropTypes.func.isRequired

Callback, invoked when height is measured (and when it is changed).

getElementHeight: PropTypes.func

Function to measure your element. It receives the element as argument and defaults to el => el.clientHeight.

children: PropTypes.node.isRequired

One or multiple children with static, variable or dynamic height.

<ReactHeight onHeightReady={height => console.log(height)}>
  <p>Paragraph of text</p>
  <p>Another paragraph is also OK</p>
  <p>Images and any other content are ok too</p>
  <img src="nyancat.gif" />
</ReactHeight>

hidden: PropTypes.bool (default: false)

ReactHeight can render to null as soon as height is measured.

<ReactHeight hidden={true} onHeightReady={height => console.log(height)}>
  <div>Will be removed from the DOM when height is measured</div>
</ReactHeight>

Pass-through props

All other props are applied to a container that is being measured. So it is possible to pass style or className, for example.

<ReactHeight onHeightReady={height => console.log(height)}
  style={{width: 200, border: '1px solid red'}}
  className="myComponent">

  <div>
    Wrapper around this element will have red border, 200px width
    and `class="myComponent"`
  </div>
</ReactHeight>

Development and testing

Currently is being developed and tested with the latest stable Node 7 on OSX and Windows. Should be ok with Node 6, but not guaranteed.

To run example covering all ReactHeight features, use npm start, which will compile src/example/Example.js

git clone git@github.com:nkbt/react-height.git
cd react-height
npm install
npm start

# then
open http://localhost:8080

Tests

npm test

# to run tests in watch mode for development
npm run test:dev

# to generate test coverage (./reports/coverage)
npm run test:cov

License

MIT