Hi besties! Today we will talk about Props aka Properties.
So what are props?
Props are a way to pass data to a component. They allow the components to be dynamic and customizable.
They are different from displaying the same static content.
We would pass one argument, props, that would represent an object that held all the data passed to the component in one place. In the component, we would access the props as we access any passed parameters.
Greeting.jsx
const Greeting = (props) => {
console.log(props);
};
Since props is an object, we can access the properties of that object.
Greeting.jsx
const Greeting = (props) => {
console.log(props.name);
};We can also use props inside JSX!
When you’re using JavaScript inside JSX, you need to put the JavaScript inside the curly braces.
Greeting.jsx
const Greeting = (props) => {
return <h1>Hi, {props.name}!</h1>;
};And to pass a property to a component, you need to add it as an attribute in the component’s tag―similar to setting attributes in HTML.
index.jsx
import React from "react";
import { createRoot } from "react-dom/client";
import Greeting from "./Greeting";
const rootElement = document.getElementById("root");
const root = createRoot(rootElement);
root.render(<Greeting name = "Eve"/>);So, to put together of what we just did:
index.html
<html>
<head>
<script type="module" src="./index.js"></script>
</head>
<body>
<div id="root"></div>
</body>
</html>index.jsx
import React from "react";
import { createRoot } from "react-dom/client";
import Message from "./Message";
const rootElement = document.getElementById("root");
const root = createRoot(rootElement);
root.render(<Message text="Welcome to the Matrix" />);Message.jsx
import React from "react";
const Message = (props) => {
return <h1>{props.text}</h1>;
};
export default Message;Thus, the method to access the value of a property passes as a prop in a React components is: props.propertyName.
Reminder:
- You’re not limited to only passing one property. If we want to pass multiple properties, you can do so.
- If you pass multiple properties, they become part of the props object which would allow you to access each one through it.
Greeting.jsx
import React from "react";
const Greeting = (props) => {
console.log(props);
return (
<div>
<h1>Hi, {props.name}!</h1>
<p>You're from {props.location}.</p>
</div>
);
};
export default Greeting;- You can also pass other types as properties as well such as numbers. If you are passing a non-string such as numbers, you need to wrap the value in curly braces {}
- When you’re accessing a passed property, the type doesn’t matter whether it is a number or a string as long as you access them all by their key. Passing booleans also work similarly.
App.jsx
import React from "react";
import Greeting from "./Greeting";
const App = () => {
return (
<div>
<img src="https://mimo.app/i/earth.png" />
<Greeting name="Adam" location="Eden" age={ 69 } />
</div>
);
};
export default App;- However, keep in mind that you cannot render a boolean directly as a strong in React. You won’t be able to see anything if you try to render a boolean value directly.
- So, if you want to render a boolean (or a number) as a string, you can use the String(value) to convert a given variable called value to a string.
Greeting.jsx
import React from "react";
const Greeting = (props) => {
return (
<div>
<h1>Hi, {props.name}!</h1>
<p>You're from {props.location}.</p>
<p>You're {props.age} years old.</p>
<p>Are you nice? { String (props.nice) }</p>
</div>
);
};
export default Greeting;Anyways, that’s all for today! See you next on Buttons with React 😝💋
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