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https://github.com/eBay/nice-modal-react

A modal state manager for React.
https://github.com/eBay/nice-modal-react

modal react

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A modal state manager for React.

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README 

        
# Nice Modal



This is a small, zero dependency utility to manage modals in a natural way for React. It uses context to persist state of modals globally so that you can show/hide a modal easily either by the modal component or id.



> You can also see the introduction at [eBay tech blog](https://medium.com/ebaytech/rethink-modals-management-in-react-cf3b6804223d).

> 

> ***Also check out our another nice utility! [nice-form-react](https://github.com/eBay/nice-form-react)! 😜***



[![NPM](https://img.shields.io/npm/v/@ebay/nice-modal-react.svg)](https://www.npmjs.com/package/@ebay/nice-modal-react)

[![Downloads](https://img.shields.io/npm/dm/@ebay/nice-modal-react.svg)](https://www.npmjs.com/package/@ebay/nice-modal-react)

[![Build Status](https://api.travis-ci.com/eBay/nice-modal-react.svg?branch=main)](https://app.travis-ci.com/github/eBay/nice-modal-react)

[![Coverage Status](https://codecov.io/gh/ebay/nice-modal-react/branch/main/graph/badge.svg)](https://codecov.io/github/eBay/nice-modal-react)

[![Demo](https://img.shields.io/badge/demo-link-orange.svg)](https://ebay.github.io/nice-modal-react/)

[![MIT licensed](https://img.shields.io/badge/license-MIT-blue.svg)](https://github.com/eBay/nice-modal-react/blob/main/LICENSE.md)



For example, you can use below code to show a modal anywhere:



```jsx

import NiceModal from '@ebay/nice-modal-react';

import MyModal from './MyModal';



//...

NiceModal.show(MyModal, { someProp: 'hello' }).then(() => {

  // do something if the task in the modal finished.

});

//...

```



Or you can register the modal with an id so that you don't need to import the modal component to use it:

```jsx

import NiceModal from '@ebay/nice-modal-react';

import MyModal from './MyModal';



NiceModal.register('my-modal', MyModal);



// you can use the string id to show/hide the modal anywhere

NiceModal.show('my-modal', { someProp: 'hello' }).then(() => {

  // do something if the task in the modal finished.

});

//...



```



**NOTE**: `@ebay/nice-modal-react` is not a React modal component but should be used with other modal/dialog implementations by UI libraries like [Material UI](https://material-ui.com/), [Ant.Design](https://ant.design), [Bootstrap React](https://react-bootstrap.github.io/), etc.



# Examples

You can see a list of examples at: https://ebay.github.io/nice-modal-react



# Key Features

* Zero dependency and small: ~2kb after gzip.

* Uncontrolled. You can close modal itself in the modal component.

* Decoupled. You don't have to import a modal component to use it. Modals can be managed by id.

* The code of your modal component is not executed if it's invisible.

* It doesn't break the transitions of showing/hiding a modal.

* Promise based. Besides using props to interact with the modal from the parent component, you can do it easier by promise.

* Easy to integrate with any UI library.



# Motivation

Using modals in React is a bit frustrating. Think of that if you need to implement the below UI:






The dialog is used to create a JIRA ticket. It could be shown from many places, from the header to the context menu, to the list page. Traditionally, we had declared modal components with a JSX tag. But then the question became, “Where should we declare the tag?”



The most common option was to declare it wherever it was being used. But using modals in a declarative way is not only about a JSX tag but also about maintaining the modal’s state like visibility, and parameters in the container component. Declaring it everywhere means managing the state everywhere. It's frustrating.



The other option put it in the Root component, for example:



```jsx

const Root = () => {

  const [visible, setVisible] = useState(false);

  // other logic ...

  return (

    <>

      

      

    >

  );

}

```



However, when you declare the modal in the root component, there are some issues:



1. Not scalable. It's unreasonable to maintain the modal's state in the root component. When you need more modals you need to maintain much state, especially you need to maintain arguments for the modal.

2. It's hard to show or hide the modal from children components. When you maintain the state in a component then you need to pass `setVisible` down to the place where you need to show or hide the modal. It makes things too complicated.



Unfortunately, most examples of using modals just follow this practice, it causes such confusions when managing modals in React.



I believe you must once encountered with the scenario that originally you only needed to show a modal when you click a button, then when requirements changed, you need to open the same modal from a different place. Then you have to refactor your code to re-consider where to declare the modal. The root cause of such annoying things is just because we have not understood the essentials of a modal.



# Rethink the Modal Usage Pattern in React

According to the [Wikipedia](https://en.wikipedia.org/wiki/Modal_window), a modal can be described as:



> A window that prevents the user from interacting with your application until he closes the window.



From the definition, we can get a conclusion: a modal is a global view that's not necessarily related with a specific context.



This is very similar with the page concept in a single page UI application. The visibility/ state of modals should be managed globally because, from the UI perspective, a modal could be shown above any page/component. The only difference between a modal and a page is: a modal allows you to not leave the current page to do some separate tasks.



For pages management, we already have router framework like React Router, it helps to navigate to a page by URL. Actually, you can think of a URL as a global id for a page. So, similarly, what if you assign a unique id to a modal and then show/hide it by the id? This is just how we designed NiceModal.



# Usage

## Installation



```bash

# with yarn

yarn add @ebay/nice-modal-react



# or with npm

npm install @ebay/nice-modal-react

```



## Create Your Modal Component

With NiceModal you can create a separate modal component easily. It's just the same as creating a normal component but wrapping it with high order component by `NiceModal.create`. For example, the below code shows how to create a dialog with [Ant.Design](https://ant.design):



```jsx

import { Modal } from 'antd';

import NiceModal, { useModal } from '@ebay/nice-modal-react';



export default NiceModal.create(({ name }: { name: string }) => {

  // Use a hook to manage the modal state

  const modal = useModal();

  return (

     modal.hide()}

      visible={modal.visible}

      onCancel={() => modal.hide()}

      afterClose={() => modal.remove()}

    >

      Hello {name}!

    

  );

});

```



From the code, we can see:

* The modal is uncontrolled. You can hide your modal inside the component regardless of where it is shown.

* The high order component created by `NiceModal.create` ensures your component is not executed before it becomes visible.

* You can call `modal.remove` to remove your modal component from the React component tree to reserve transitions.



Next, let's see how to use the modal.



## Using Your Modal Component

There are very flexible APIs for you to manage modals. See below for the introduction.



### Embed your application with `NiceModal.Provider`:

Since we will manage the status of modals globally, the first thing is embedding your app with NiceModal provider, for example:



```js

import NiceModal from '@ebay/nice-modal-react';

ReactDOM.render(

  

    

      

    

  ,

  document.getElementById('root'),

);

```



The provider will use React context to maintain all modals' state.



### Using the modal by component

You can control a nice modal by the component itself.

```js

import NiceModal from '@ebay/nice-modal-react';

import MyAntdModal from './my-antd-modal'; // created by above code



function App() {

  const showAntdModal = () => {

    // Show a modal with arguments passed to the component as props

    NiceModal.show(MyAntdModal, { name: 'Nate' })

  };

  return (

    


      
Nice Modal Examples


      


        Antd Modal

      


    


  );

}

```



### Use the modal by id

You can also control a nice modal by id:

```js

import NiceModal from '@ebay/nice-modal-react';

import MyAntdModal from './my-antd-modal'; // created by above code



// If you use by id, you need to register the modal component.

// Normally you create a modals.js file in your project

// and register all modals there.

NiceModal.register('my-antd-modal', MyAntdModal);



function App() {

  const showAntdModal = () => {

    // Show a modal with arguments passed to the component as props

    NiceModal.show('my-antd-modal', { name: 'Nate' })

  };

  return (

    


      
Nice Modal Examples


      


        Antd Modal

      


    


  );

}

```



### Use modal with the hook

The `useModal` hook can not only be used inside a modal component but also any component by passing it a modal id/component:



```jsx

import NiceModal, { useModal } from '@ebay/nice-modal-react';

import MyAntdModal from './my-antd-modal'; // created by above code



NiceModal.register('my-antd-modal', MyAntdModal);

//...

// if you use with id, you need to register it first

const modal = useModal('my-antd-modal');

// or if with component, no need to register

const modal = useModal(MyAntdModal);



//...

modal.show({ name: 'Nate' }); // show the modal

modal.hide(); // hide the modal

//...

```



### Declare your modal instead of `register`

The nice modal component you created can be also used as a normal component by JSX, then you don't need to register it. For example:



```jsx

import NiceModal, { useModal } from '@ebay/nice-modal-react';

import MyAntdModal from './my-antd-modal'; // created by above code



function App() {

  const showAntdModal = () => {

    // Show a modal with arguments passed to the component as props

    NiceModal.show('my-antd-modal')

  };

  return (

    


      
Nice Modal Examples


      


        Antd Modal

      


      

    


  );

}

```



With this approach, you can get the benefits:

* Inherit React context in the modal component under some component node.

* Pass arguments to the modal component via props.



> NOTE: If you attempt to show the component by ID but the modal is not declared or registered, nothing will happen except for a warning message in the dev console.



### Using promise API



Besides using props to interact with the modal from the parent component, you can do more easily by promise. For example, we have a user list page with an add user button to show a dialog to add user. After user is added the list should refresh itself to reflect the change, then we can use below code:



```jsx

NiceModal.show(AddUserModal)

  .then(() => {

    // When call modal.resolve(payload) in the modal component

    // it will resolve the promise returned by `show` method.

    // fetchUsers will call the rest API and update the list

    fetchUsers()

  })

  .catch(err=> {

    // if modal.reject(new Error('something went wrong')), it will reject the promise

  }); 

```



You can see the live example on codesandbox.



### Integrating with Redux

Though not necessary, you can integrate Redux to manage the state of nice modals. Then you can use Redux dev tools to track/debug state change of modals. Here is how to do it:



```jsx

// First combine the reducer

import { createStore, applyMiddleware, compose, combineReducers } from 'redux';

import { Provider, useSelector, useDispatch } from 'react-redux';

import NiceModal from '@ebay/nice-modal-react';

import { Button } from 'antd';

import { MyAntdModal } from './MyAntdModal';

import logger from 'redux-logger';



const composeEnhancers = (typeof window !== 'undefined' && window.__REDUX_DEVTOOLS_EXTENSION_COMPOSE__) || compose;

const enhancer = composeEnhancers(applyMiddleware(logger));



const store = createStore(

  combineReducers({

    modals: NiceModal.reducer,

    // other reducers...

  }),

  enhancer,

);



// Passing Redux state to the nice modal provider

const ModalsProvider = ({ children }) => {

  const modals = useSelector((s) => s.modals);

  const dispatch = useDispatch();

  return (

    

      {children}

    

  );

};



export default function ReduxProvider({ children }) {

  return (

    

      {children}

    

  );

}

```



### Using with any UI library

NiceModal provides lifecycle methods to manage the state of modals. You can use modal handler returned by `useModal` hook to bind any modal-like component to the state. Below are typical states and methods you will use:



* ***modal.visible**: the visibility of a modal.

* ***modal.hide**: will hide the modal, that is, change `modal.visible` to false.

* ***modal.remove**: remove the modal component from the tree so that your modal's code is not executed when it's invisible. Usually, you call this method after the modal's transition.

* ***modal.keepMounted** if you don't want to remove the modal from the tree for some instances, you can decide if call `modal.remove` based on the value of `keepMounted`.



Based on these properties/methods, you can easily use NiceModal with any modal-like component provided by any UI libraries.



### Using help methods

As you already saw, we use code similar with below to manage the modal state:



```jsx

//...

const modal = useModal();

return (

   modal.hide()}

    onCancel={() => modal.hide()}

    afterClose={() => modal.remove()}

  >

    Hello NiceModal!

  

);

//...

```



It binds `visible` property to the `modal` handler, and uses `modal.hide` to hide the modal when close button is clicked. And after the close transition it calls `modal.remove` to remove the modal from the dom node.



For every modal implementation, we always need to do these bindings manually. So, to make it easier to use we provided helper methods for 3 popular UI libraries Material UI, Ant.Design and Bootstrap React.



```jsx

import NiceModal, {

  muiDialog,

  muiDialogV5,

  antdModal,

  antdModalV5,

  antdDrawer,

  antdDrawerV5,

  bootstrapDialog

} from '@ebay/nice-modal-react';



//...

const modal = useModal();

// For MUI



// For MUI V5



// For ant.design



// For ant.design v4.23.0 or later



// For antd drawer



// For antd drawer v4.23.0 or later



// For bootstrap dialog



```



These helpers will bind modal's common actions to correct properties of the component. However, you can always override the property after the helper's property. For example:



```jsx

const handleSubmit = () => {

  doSubmit().then(() => {

    modal.hide();

  });

}



```



In the example, the `onOk` property will override the result from `antdModal` helper.



## API Reference

https://ebay.github.io/nice-modal-react/api/



## Testing



You can test your nice modals with tools like `@testing-library/react`.



```jsx

import NiceModal from '@ebay/nice-modal-react';

import { render, act, screen } from '@testing-library/react';

import { MyNiceModal } from '../MyNiceModal';



test('My nice modal works!', () => {

  render(

  

  act(() => {

    NiceModal.show(MyNiceModal);

  });

  

  expect(screen.getByRole('dialog')).toBeVisible();

});

```



## Contribution Guide

```bash

# 1. Clone repo

git clone https://github.com/eBay/nice-modal-react.git



# 2. Install deps

cd nice-modal-react

yarn



# 3. Make local repo as linked

yarn link



# 4. Start dev server

yarn dev



# 5. Install examples deps

cd example

yarn



# 6. Use local linked lib

yarn link @ebay/nice-modal-react



# 7. Start examples dev server

yarn start

```



Then you can access http://localhost:3000 to see the examples.



## FAQ

### Can I get context in the component tree in a modal?

Yes. To get the data from context in the component tree you need to use the declarative way. For example:

```jsx

export default function AntdSample() {

  return (

    <>

       NiceModal.show('my-antd-modal', { name: 'Nate' })}>

        Show Modal

      

      

    >

  );

}

```

See more [here](https://github.com/eBay/nice-modal-react/issues/104).



# License

MIT