react-modal

What is react-modal?

The react-modal npm package is a library that provides accessible modal dialog components for React applications. It allows developers to create and manage modals in an accessible way, following the WAI-ARIA guidelines for modality. The package offers features such as locking the background scroll when a modal is open, setting the app element, and customizing styles and behaviors of the modal.

What are react-modal's main functionalities?

Basic Modal Usage

This code demonstrates how to create a basic modal using react-modal. It includes a button to open the modal and a button inside the modal to close it.

{"import React, { useState } from 'react';\nimport Modal from 'react-modal';\n\nconst App = () => {\n  const [modalIsOpen, setModalIsOpen] = useState(false);\n\n  function openModal() {\n    setModalIsOpen(true);\n  }\n\n  function closeModal() {\n    setModalIsOpen(false);\n  }\n\n  return (\n    <div>\n      <button onClick={openModal}>Open Modal</button>\n      <Modal\n        isOpen={modalIsOpen}\n        onRequestClose={closeModal}\n        contentLabel='Example Modal'\n      >\n        <h2>Hello</h2>\n        <button onClick={closeModal}>close</button>\n        <div>I am a modal</div>\n      </Modal>\n    </div>\n  );\n};\n\nexport default App;"}

Custom Styles

This code snippet shows how to apply custom styles to a modal using the 'style' prop.

{"import React from 'react';\nimport Modal from 'react-modal';\n\nconst customStyles = {\n  content: {\n    top: '50%',\n    left: '50%',\n    right: 'auto',\n    bottom: 'auto',\n    marginRight: '-50%',\n    transform: 'translate(-50%, -50%)'\n  }\n};\n\nconst App = () => {\n  return (\n    <Modal\n      isOpen={true}\n      style={customStyles}\n      contentLabel='Example Modal'\n    >\n      <h2>Hello</h2>\n      <button>close</button>\n      <div>I am a modal with custom styles</div>\n    </Modal>\n  );\n};\n\nexport default App;"}

Accessibility Features

This example demonstrates how to enhance the accessibility of a modal by setting the app element and using ARIA attributes.

{"import React from 'react';\nimport Modal from 'react-modal';\n\nModal.setAppElement('#yourAppElement');\n\nconst App = () => {\n  return (\n    <Modal\n      isOpen={true}\n      aria={{\n        labelledby: 'heading',\n        describedby: 'full_description'\n      }}\n      contentLabel='Accessible Example Modal'\n    >\n      <h2 id='heading'>Hello</h2>\n      <div id='full_description'>I am an accessible modal</div>\n      <button>close</button>\n    </Modal>\n  );\n};\n\nexport default App;"}

Other packages similar to react-modal

react-bootstrap

React Bootstrap provides a Bootstrap-based modal component. It is similar to react-modal but also includes a wide range of other Bootstrap components for use in React.

material-ui

Material-UI offers a Dialog component that is similar to react-modal. It follows Material Design guidelines and integrates well with other Material-UI components.

reactstrap

reactstrap is another Bootstrap-based library that includes a Modal component. It is similar to react-modal but is specifically designed for use with Bootstrap 4.

README

react-modal

Accessible modal dialog component for React.JS

Table of Contents

• Installation
• Usage
• Styles
• Examples
• Testing
• Demos

Installation

To install, you can use npm or yarn:

$ npm install react-modal
$ yarn add react-modal

Usage

The Modal object has one required prop:

• isOpen to render its children.

Example:

<Modal
  isOpen={bool}
  onAfterOpen={afterOpenFn}
  onRequestClose={requestCloseFn}
  closeTimeoutMS={n}
  style={customStyle}
  contentLabel="Modal"
>
  <h1>Modal Content</h1>
  <p>Etc.</p>
</Modal>

Use the prop contentLabel which adds aria-label to the modal if there is no label text visible on the screen, otherwise specify the element including the label text using aria-labelledby

App Element

The app element allows you to specify the portion of your app that should be hidden (via aria-hidden) to prevent assistive technologies such as screenreaders from reading content outside of the content of your modal.

It's optional and if not specified it will try to use document.body as your app element.

If you are doing server-side rendering, you should use this property.

It can be specified in the following ways:

• DOMElement

Modal.setAppElement(appElement);

• query selector - uses the first element found if you pass in a class.

Modal.setAppElement('#your-app-element');

Additional Aria Attributes

Use the property aria to pass any additional aria attributes. It accepts an object where the keys are the names of the attributes without the prefix aria-.

Example:

<Modal
  isOpen={modalIsOpen}
  aria={{
    labelledby: "heading",
    describedby: "full_description"
  }}>
  <h1 id="heading">H1</h1>
  <div id="full_description">
    <p>Description goes here.</p>
  </div>
</Modal>

Styles

Styles are passed as an object with 2 keys, 'overlay' and 'content' like so

{
  overlay : {
    position          : 'fixed',
    top               : 0,
    left              : 0,
    right             : 0,
    bottom            : 0,
    backgroundColor   : 'rgba(255, 255, 255, 0.75)'
  },
  content : {
    position                   : 'absolute',
    top                        : '40px',
    left                       : '40px',
    right                      : '40px',
    bottom                     : '40px',
    border                     : '1px solid #ccc',
    background                 : '#fff',
    overflow                   : 'auto',
    WebkitOverflowScrolling    : 'touch',
    borderRadius               : '4px',
    outline                    : 'none',
    padding                    : '20px'

  }
}

Styles passed to the modal are merged in with the above defaults and applied to their respective elements. At this time, media queries will need to be handled by the consumer.

Using CSS Classes

If you prefer not to use inline styles or are unable to do so in your project, you can pass className and overlayClassName props to the Modal. If you do this then none of the default styles will apply and you will have full control over styling via CSS.

If you want to override default content and overlay classes you can pass object with three required properties: base, afterOpen, beforeClose.

<Modal
  ...
  className={{
    base: 'myClass',
    afterOpen: 'myClass_after-open',
    beforeClose: 'myClass_before-close'
  }}
  overlayClassName={{
    base: 'myOverlayClass',
    afterOpen: 'myOverlayClass_after-open',
    beforeClose: 'myOverlayClass_before-close'
  }}
  ...
>

You can also pass a portalClassName to change the wrapper's class (ReactModalPortal). This doesn't affect styling as no styles are applied to this element by default.

Overriding styles globally

The default styles above are available on Modal.defaultStyles. Changes to this object will apply to all instances of the modal.

Appended to custom node

You can choose an element for the modal to be appended to, rather than using body tag. To do this, provide a function to parentSelector prop that return the element to be used.

function getParent() {
  return document.querySelector('#root');
}

<Modal
  ...
  parentSelector={getParent}
  ...
>
  <p>Modal Content.</p>
</Modal>

Body class

When the modal is opened a ReactModal__Body--open class is added to the body tag. You can use this to remove scrolling on the the body while the modal is open.

/* Remove scroll on the body when react-modal is open */
.ReactModal__Body--open {
    overflow: hidden;
}

Examples

Inside an app:

import React from 'react';
import ReactDOM from 'react-dom';
import Modal from 'react-modal';

const customStyles = {
  content : {
    top                   : '50%',
    left                  : '50%',
    right                 : 'auto',
    bottom                : 'auto',
    marginRight           : '-50%',
    transform             : 'translate(-50%, -50%)'
  }
};

class App extends React.Component {
  constructor() {
    super();

    this.state = {
      modalIsOpen: false
    };

    this.openModal = this.openModal.bind(this);
    this.afterOpenModal = this.afterOpenModal.bind(this);
    this.closeModal = this.closeModal.bind(this);
  }

  openModal() {
    this.setState({modalIsOpen: true});
  }

  afterOpenModal() {
    // references are now sync'd and can be accessed.
    this.subtitle.style.color = '#f00';
  }

  closeModal() {
    this.setState({modalIsOpen: false});
  }

  render() {
    return (
      <div>
        <button onClick={this.openModal}>Open Modal</button>
        <Modal
          isOpen={this.state.modalIsOpen}
          onAfterOpen={this.afterOpenModal}
          onRequestClose={this.closeModal}
          style={customStyles}
          contentLabel="Example Modal"
        >

          <h2 ref={subtitle => this.subtitle = subtitle}>Hello</h2>
          <button onClick={this.closeModal}>close</button>
          <div>I am a modal</div>
          <form>
            <input />
            <button>tab navigation</button>
            <button>stays</button>
            <button>inside</button>
            <button>the modal</button>
          </form>
        </Modal>
      </div>
    );
  }
}

ReactDOM.render(<App />, appElement);

Testing

When using React Test Utils with this library, here are some things to keep in mind:

• You need to set isOpen={true} on the modal component for it to render its children.
• You need to use the .portal property, as in ReactDOM.findDOMNode(renderedModal.portal) or TestUtils.scryRenderedDOMComponentsWithClass(Modal.portal, 'my-modal-class') to acquire a handle to the inner contents of your modal.

By default the modal is closed when clicking outside of it (the overlay area). If you want to prevent this behavior you can pass the 'shouldCloseOnOverlayClick' prop with 'false' value.

<Modal
  isOpen={bool}
  onAfterOpen={afterOpenFn}
  onRequestClose={requestCloseFn}
  closeTimeoutMS={n}
  shouldCloseOnOverlayClick={false}
  style={customStyle}
  contentLabel="No Overlay Click Modal"
>

  <h1>Force Modal</h1>
  <p>Modal cannot be closed when clicking the overlay area</p>
  <button onClick={handleCloseFunc}>Close Modal...</button>
</Modal>

Demos

• http://reactjs.github.io/react-modal/