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React Watcher\n\n[![Build Status](https://travis-ci.org/sborrazas/react-watcher.svg?branch=master)](https://travis-ci.org/sborrazas/react-watcher)\n\nSimple helper to watch your React components prop changes.\n\nRequires [React](https://github.com/facebook/react) to render components.\n\n**Note:** Using this library for watching prop changes is highly discouraged.\nIt is however the only way of watching prop changes when using external\nlibraries or very complex component trees prop configurations.\n\n## Install\n\n```\nnpm install react-watcher\n```\n\n## Examples\n\n### Quickstart\n\nWrap a component to access `watch` (and `unwatch`) binding functions.\n\n```js\nimport connect from 'react-watcher';\n\nclass UserDetail extends React.PureComponent {\n  render() {\n    const { id } = this.props;\n\n    return (\u003cdiv\u003e{id}\u003c/div\u003e);\n  }\n  componentWillMount() {\n    const { watch } = this.props;\n\n    watch('id', (newId) =\u003e {\n      // New ID assigned, you can use this to dispatch a user fetch action or\n      // any other Redux action dispatch or function call.\n    });\n  }\n}\n\nexport default connect(UserDetail);\n```\n\n**Note:** The prop to watch can be any value accepted by\n[Lodash get function](https://lodash.com/docs/4.17.4#get). Examples:\n`'params.id'`, `'users[0].id'`, `['users', 0, 'id']`.\n\n## API\n\n### `connect`\n\nConnect the React component to get the `watch` and `unwatch` props for binding\nthe prop change events.\n\n#### Arguments\n\n* `Component` (required) – The React component to connect to.\n\n#### Exposed props\n\n* `watch(propPath, callback)` – Binds the prop change to the given callback.\n* `unwatch(propPath)` – Removes the binding. Note: `unwatch` doesn't need to be\ncalled on component unmount. Bindings will be freed automatically.\n\n## Common pitfalls\n\nUsing this library for watching prop changes that you change directly is highly\ndiscouraged. Instead, call the prop change callback when the change is performed.\n\n```js\n/* Bad */\nclass UsersList extends React.Component {\n  render() {\n    const { activeFilter, users } = this.props;\n\n    return (/* ... */);\n  }\n  toggleActive(event) {\n    dispatch(toggleActiveAction());\n  }\n  componentWillMount() {\n    this.props.watch('activeFilter', (activeFilter) =\u003e {\n      alert('Active filter has changed!');\n    });\n  }\n}\n\nexport default connect(UsersList);\n\n/* Good */\nclass UsersList extends React.Component {\n  render() {\n    const { activeFilter, users } = this.props;\n\n    return (/* ... */);\n  }\n  toggleActive(event) {\n    dispatch(toggleActiveAction());\n    alert('Active filter has changed!');\n  }\n}\n```\n\n\n## Authors\n\n**Sebastián Borrazás**\n\n* [sborrazas.com](http://sborrazas.com)\n\n## License\n\nMIT\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fsborrazas%2Freact-watcher","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fsborrazas%2Freact-watcher","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fsborrazas%2Freact-watcher/lists"}