How to use PropTypes to set the type of props required
Since JavaScript is a dynamically typed language, we actually have no way to force the types of variables at compile time, and if we pass invalid types, they will fail at runtime, or give weird ones if the types are compatible The result, but what we expected.
Flow andTypescriptCan provide a lot of help, but React can directly help props type, even before running the code, our tools (editor, lints) can also detect when the wrong value is passed:
import PropTypes from 'prop-types'
import React from 'react'
class BlogPostExcerpt extends Component {
render() {
return (
<div>
<h1>{this.props.title}</h1>
<p>{this.props.description}</p>
</div>
)
}
}
BlogPostExcerpt.propTypes = {
title: PropTypes.string,
description: PropTypes.string
}
export default BlogPostExcerpt
What types can we use
These are the basic types that we can accept:
- PropTypes.array
- PropTypes.bool
- PropTypes.func
- PropTypes.number
- PropTypes.object
- PropTypes.string
- PropTypes.symbol
We can accept one of the following two types:
PropTypes.oneOfType([
PropTypes.string,
PropTypes.number
]),
We can accept one of many values:
PropTypes.oneOf(['Test1', 'Test2']),
We can accept an instance of a class:
PropTypes.instanceOf(Something)
We can accept any React node:
PropTypes.node
There is not even any type at all:
PropTypes.any
Arrays have a special syntax, we can use it to accept specific types of arrays:
PropTypes.arrayOf(PropTypes.string)
Object, we can use
PropTypes.shape({
color: PropTypes.string,
fontSize: PropTypes.number
})
Required attributes
AppendingisRequired
If this attribute is missing, setting any PropTypes option will cause React to return an error:
PropTypes.arrayOf(PropTypes.string).isRequired,
PropTypes.string.isRequired,
Download mine for freeResponse Handbook
More response tutorials:
- A simple React application example: Get GitHub user information through API
- Build a simple counter with React
- VS Code setup for React development
- How to pass props to child components through React Router
- Create an application using Electron and React
- Tutorial: Create a spreadsheet with React
- Roadmap for learning React
- Learn how to use Redux
- Getting started with JSX
- Stylized components
- Introduction to Redux Saga
- Introduction to React Router
- Introduction to React
- Reaction component
- Virtual DOM
- Reaction event
- Reaction state
- Reaction props
- Reaction fragment
- React Context API
- Reaction PropTypes
- Reaction Concept: Declarative
- React: How to display other components when clicked
- How to loop inside React JSX
- Props and status in React
- Should you use jQuery or React?
- How much JavaScript do I need to know to use React?
- Gatsby Introduction
- How to reference DOM elements in React
- One-way data flow in React
- React high-end components
- React to life cycle events
- Reaction concept: immutability
- Reaction concept: purity
- Introduction to React hooks
- Introduction to create-react-app
- Reaction concept: composition
- React: demo component and container component
- Code splitting in React
- Server-side rendering with React
- How to install React
- CSS in React
- Use SASS in React
- Processing forms in React
- Reaction strict mode
- Reaction portal
- React rendering props
- Test React components
- How to pass parameters to event handlers in React
- How to deal with errors in React
- How to return multiple elements in JSX
- Conditional rendering in React
- Reaction, how to transfer props to subcomponents
- How to get the value of an input element in React
- How to use useState React hook
- How to use useCallback React hook
- How to use useEffect React hook
- How to use useMemo React hook
- How to use useRef React hook
- How to use useContext React hook
- How to use useReducer React hook
- How to connect your React app to the backend of the same source
- Reaching the router tutorial
- How to use React Developer Tools
- How to learn React
- How to debug a React application
- How to render HTML in React
- How to fix `dangerouslySetInnerHTML` does not match the error in React
- How can I solve the problem of React login form status and browser auto-fill
- How to configure HTTPS in React application on localhost
- How to fix the "Component cannot be updated while rendering other components" error in React
- Can I use React hooks within the conditions?
- Using useState with objects: how to update
- How to move in code blocks using React and Tailwind
- React, focus on an item in React when added to the DOM
- Response, edit text on doubleclick