react-modal-port

This small but neat package allows you to:

• Define and style modals the way you want or need.
• Launch modals flexibly from anywhere in your React app.
• Have them render at one specific place in your DOM.

Demo: https://codepen.io/oliverwehn/pen/YzMyoBr

---

• Installation
• Components
  • ModalContextProvider
  • ModalPort
• Launching Modals
• Stacking Modals And Handling Modal State

---

🏁 Installation

$ npm install react-modal-port

🧩 Components

ModalContextProvider

The ModalContextProvider wraps your app to allow your app’s components to launch or render modals.

ModalPort

The ModalPort handles the rendering of your modals. It leaves the how you want to render your modals fully up to you. It simply requires a React.FunctionComponent to be passed to it via its render prop. This component allows you to wrap any rendered modal in, for example, a backdrop component.

Besides children a prop onBackdropClick is passed to render. It holds, if provided to the modal on launch, the click handler function that should be called if the backdrop is clicked, e.g. to dismiss the modal.

import { ModalContextProvider } from 'react-modal-port';

// Backdrop component to be passed to the `ModalPort`’s `render` prop
const Backdrop: React.FC<ModalPortRenderProps> = ({ children, onBackdropClick }) => (
  <div
    style="
      position: fixed;
      z-index: 1000,
      display: flex;
      justify-content: center;
      align-items-center;
      background-color: rgba(0,0,0,.65);
      top: 0;
      right: 0;
      bottom: 0;
      left: 0;
    "
    onClick={onBackdropClick}
  >
    {children}
  </div>
);

// Your app’s root layout component
const RootLayout:React.FC<PropsWithChildren> = ({ children }) => (
  <ModalContextProvider>
    <div style="width: 100%; min-height: 100vh;">
      {children}
      <ModalPort render={Backdrop} />
    </div>
  </ModalContextProvider>
);

export default RootLayout;

🚀 Launching Modals

Launching modals makes use of the useModal hook that provides you with the launchModal function.

import { useModal } from 'react-modal-port';
import DecisionModal from './modals/decision';

const Page: React.FC = () => {

  const launchModal = useModal();
  const [ decision, setDecision ] = useState<boolean|null>(null);

  const onClick = () => {
    launchModal(
      // Modal component
      DecisionModal, 
      // Modal resolvers
      {
        decideYay: () => setDecision(true),
        decideNay: () => setDecision(false),
        // Provide an `onBackdropClick` resolver to have it passed to
        // the Backdrop component
        onBackdropClick: () => {},
      },
      // Optionally, add further props to be passed to the modal component
      {
        timeLeft: Math.random() * 86400
      }
    );
  }

  return (
    <div style="padding: 4rem;">
      <h1>Welcome</h1>
      {decision === null && (
      <p>Make your decision!</p>
      ) || (
      <p>Your decision is: {decision && "Yay" || "Nay"}</p>
      )}
      
      <div style="display: flex; flex-direction: row; gap: 0.5rem;">
        <button type="button" onClick={onClick}>Let me decide now</button>
      </div>
    </div>
  );
}

The launchModal function expects the following arguments:

Argument	Type	Description
render	React.FC	A function that renders the modal and returns a ReactNode.
resolvers	{ [key: string]: (...args: any[]) => Promise<void>|void }	An object of resolver functions that will be passed as props to render.
props	{ [key: string]: any }	Optional: Further props you’d like to pass to the modal component in render.

Modals can be created and designed to fully fit your needs. The only requirement is to define the functions to resolve them, for example, when clicking a button. The modal component for the example above could look like this:

type DecisionModalProps = {
  decideYay: () => void;
  decideNay: () => void;
  leaveMeAlone?: () => void;
};

const DecisionModal: React.FC<DecisionModalProps> = ({
  decideYay,
  decideNay,
}) => (
  <div
    style="background-color: white; border-radius: 0.5rem; padding: 1rem; display: flex; flex-direction: column; align-items: center; gap: 0.5rem;"
    role="dialog"
    aria-modal="true"
    aria-labeledby="modal-title"
    aria-describedby="modal-description"
  >
    <h4 id="modal-title">How do you decide?</h4>
    <div id ="modal-description">
      <p>Make your decision and click one of the buttons below.</p>
    </div>
    <div style="display: flex; flex-direction: row; gap: 0.25rem; justify-content: center;">
      <button type="button" onClick={decideYay}>Yay</button>
      <button type="button" onClick={decideNay}>Nay</button>
    </div>
  </div>
)

export default DecisionModal;

🔂 Asynchronous Resolution

Modals can be simple like the one above or highly complex like a full wizard experience or questionnaire. It is also possible to trigger asynchronous operations within a resolver function. As long as the resolver function returns a promise, the modal won’t close until the promise is resolved.

So you could adapt the onClick handler in our earlier example as follows:

  // ...

  const onClick = () => {
    launchModal(
      // Modal component
      DecisionModal, 
      // Modal resolvers
      {
        decideYay: () => setDecision(true),
        decideNay: () => setDecision(false),
        letMeThinkAboutIt: (p: Promise) => p,
        leaveMeAlone: () => {},
      },
    );
  }

  // ...

It then could cater the following modal functionality:

type DecisionModalProps = {
  decideYay: () => void;
  decideNay: () => void;
  letMeThinkAboutIt: (p: Promise) => Promise;
  leaveMeAlone?: () => void;
};

const DecisionModal: React.FC<DecisionModalProps> = ({
  decideYay,
  decideNay,
  letMeThinkAboutIt,
}) => {

  const imUndecided = () => {
    const p = new Promise((resolve) => {
      const options = [ decideYay, decideNay ];
      setTimeout(
        () => resolve(options[Math.round(Math.random())]),
        Math.random() * 60000
      );
    });
    letMeThinkAboutIt(p);
  };

  return (
    <div
      style="background-color: white; border-radius: 0.5rem; padding: 1rem; display: flex; flex-direction: column; align-items: center; gap: 0.5rem;"
      role="dialog"
      aria-modal="true"
      aria-labeledby="modal-title"
      aria-describedby="modal-description"
    >
      <h4 id="modal-title">How do you decide?</h4>
      <div id ="modal-description">
        <p>Make your decision and click one of the buttons below.</p>
      </div>
      <div style="display: flex; flex-direction: row; gap: 0.25rem; justify-content: center;">
        <button type="button" onClick={decideYay}>Yay</button>
        <button type="button" onClick={decideNay}>Nay</button>
        <button type="button" onClick={imUndecided}>Let me think</button>
      </div>
    </div>
  );
}

export default DecisionModal;

🥞 Stacking Modals And Handling Modal State

If you need to launch a modal from a modal, the modals become (logically) stacked. That means that the ModalPort will always render the modal at the top of the modal stack and will return to the previous one as soon as the current one is resolved. Via the resolver functions, data can be passed from the resolving modal to the modal it was launched from.

In case you need to handle state within multiple stacked modal, you can create, access, and update the modal state using the useModalState hook. It returns a tuple with the current modal state and a function to update the state. The modal state is always an object holding key-value pairs. Each modal’s modal state will persist until the modal itself is resolved.

In the example below, we’ll ask the user to enter their name and prompt them in a second modal to confirm. We’ll fall back to the first modal with the name previously entered if the user wishes to edit it once more.

import React from "react"; 
import ConfirmModal from "./ConfirmModal";

type AskForNameModalProps = {
  provideName: ModalResolver,
};

export const AskForNameModal: React.FC<AskForNameModalProps> = ({
  provideName,
}) => {

  const launchModal = useModal();
  const [ modalState, updateModalState ] = useModalState();
  const onNameChange = (ev) => {
    updateModalState({
      ...modalState,
      name: ev.target.value,
    });
  };

  const onButtonClick = () => {
    launchModal(
      ConfirmModal, 
      {
        // Chain first modal’s resolution to the second one’s
        confirm: () => provideName(modalState.name),
      },
      // Pass the name on to the ConfirmModal for rendering
      {
        name: modalState.name,
      }
    );
  };

  return (
    <div 
      style="background-color: white; border-radius: 0.5rem; padding: 1rem; display: flex; flex-direction: column; align-items: center; gap: 0.5rem;"
      role="dialog"
      aria-modal="true"
      aria-labeledby="modal-title"
      aria-describedby="modal-description"
    >
      <h4 id="modal-title">How should we call you?</h4>
      <div id="modal-description">
        <p>Please enter your firstname or nickname of choice.</p>
      </div>
      <input type="text" value={modalState.name} onChange={onNameChange} style="width: 100%">
      <button type="button" onClick={onButtonClick}>Set name</button>
    </div>
  );

}