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@sheerun/react-modal

react-modal

Accessible modal dialog component for React.JS

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Table of Contents

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.

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 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