Creating Reusable Modal Component in React

Introduction

In this lab, we will explore how to create a Modal component in React that can be controlled through events. The Modal component will have a close button, and the keyboard event listener will be used to close the modal when the Esc key is pressed. By the end of this lab, you will have a good understanding of how to create a reusable Modal component that can be easily integrated into any React project.

Modal Dialog

index.html and script.js have already been provided in the VM. In general, you only need to add code to script.js and style.css.

This code renders a Modal component that can be controlled through events. To use the component, you can import Modal once and then display it by passing a boolean value to the isVisible attribute.

The Modal component has the following features:

• It defines a keydownHandler function that handles all keyboard events and calls onClose when the Esc key is pressed.
• It uses the useEffect() hook to add or remove the keydown event listener to the Document, calling keydownHandler for every event.
• It adds a styled <span> element that acts as a close button, calling onClose when clicked.
• It uses the isVisible prop passed down from the parent to determine if the modal should be displayed or not.
• It includes a CSS file that styles the Modal component.

const Modal = ({ isVisible = false, title, content, footer, onClose }) => {
  const keydownHandler = ({ key }) => {
    switch (key) {
      case "Escape":
        onClose();
        break;
      default:
    }
  };

  React.useEffect(() => {
    document.addEventListener("keydown", keydownHandler);
    return () => document.removeEventListener("keydown", keydownHandler);
  });

  return !isVisible ? null : (
    <div className="modal" onClick={onClose}>
      <div className="modal-dialog" onClick={(e) => e.stopPropagation()}>
        <div className="modal-header">
          <h3 className="modal-title">{title}</h3>
          <span className="modal-close" onClick={onClose}>
            &times;
          </span>
        </div>
        <div className="modal-body">
          <div className="modal-content">{content}</div>
        </div>
        {footer && <div className="modal-footer">{footer}</div>}
      </div>
    </div>
  );
};

.modal {
  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  width: 100%;
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: rgba(0, 0, 0, 0.25);
  animation-name: appear;
  animation-duration: 300ms;
}

.modal-dialog {
  width: 100%;
  max-width: 550px;
  background: white;
  position: relative;
  margin: 0 20px;
  max-height: calc(100vh - 40px);
  text-align: left;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  box-shadow:
    0 4px 8px 0 rgba(0, 0, 0, 0.2),
    0 6px 20px 0 rgba(0, 0, 0, 0.19);
  -webkit-animation-name: animatetop;
  -webkit-animation-duration: 0.4s;
  animation-name: slide-in;
  animation-duration: 0.5s;
}

.modal-header,
.modal-footer {
  display: flex;
  align-items: center;
  padding: 1rem;
}

.modal-header {
  border-bottom: 1px solid #dbdbdb;
  justify-content: space-between;
}

.modal-footer {
  border-top: 1px solid #dbdbdb;
  justify-content: flex-end;
}

.modal-close {
  cursor: pointer;
  padding: 1rem;
  margin: -1rem -1rem -1rem auto;
}

.modal-body {
  overflow: auto;
}

.modal-content {
  padding: 1rem;
}

@keyframes appear {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes slide-in {
  from {
    transform: translateY(-150px);
  }
  to {
    transform: translateY(0);
  }
}

const App = () => {
  const [isModal, setModal] = React.useState(false);
  return (
    <>
      <button onClick={() => setModal(true)}>Click Here</button>
      <Modal
        isVisible={isModal}
        title="Modal Title"
        content={<p>Add your content here</p>}
        footer={<button>Cancel</button>}
        onClose={() => setModal(false)}
      />
    </>
  );
};

ReactDOM.createRoot(document.getElementById("root")).render(<App />);

Please click on 'Go Live' in the bottom right corner to run the web service on port 8080. Then, you can refresh the Web 8080 Tab to preview the web page.

Summary

Congratulations! You have completed the Modal Dialog lab. You can practice more labs in LabEx to improve your skills.