Is it mandatory to use JSX in React?
What is JSX?JSX stands for JavaScript XML. Show
JSX allows us to write HTML in React. JSX makes it easier to write and add HTML in React. Coding JSXJSX allows us to write HTML elements in JavaScript and place them in the DOM without any JSX converts HTML tags into react elements. You are not required to use JSX, but JSX makes it easier to write React applications. Here are two examples. The first uses JSX and the second does not: Example 1JSX:
Run Example » Example 2Without JSX:
Run Example » As you can see in the first example, JSX allows us to write HTML directly within the JavaScript code. JSX is an extension of the JavaScript language based on ES6, and is translated into regular JavaScript at runtime. Expressions in JSXWith JSX you can write expressions inside curly braces The expression can be a React variable, or property, or any other valid JavaScript expression. JSX will execute the expression and return the result: ExampleExecute the expression
Run Example » Inserting a Large Block of HTMLTo write HTML on multiple lines, put the HTML inside parentheses: ExampleCreate a list with three list items:
Run Example » One Top Level ElementThe HTML code must be wrapped in ONE top level element. So if you like to write two paragraphs, you must put them inside a parent element, like a ExampleWrap two paragraphs inside one DIV element:
Run Example » JSX will throw an error if the HTML is not correct, or if the HTML misses a parent element. Alternatively, you can use a "fragment" to wrap multiple lines. This will prevent unnecessarily adding extra nodes to the DOM. A fragment looks like an empty HTML tag: ExampleWrap two paragraphs inside a fragment:
Run Example » Elements Must be ClosedJSX follows XML rules, and therefore HTML elements must be properly closed. ExampleClose empty elements with
Run Example » JSX will throw an error if the HTML is not properly closed. Attribute class = classNameThe Use attribute JSX solved this by using ExampleUse attribute
Run Example » Conditions - if statementsReact supports To be able to use conditional statements in JSX, you should put the Option 1:Write ExampleWrite "Hello" if
Run Example » Option 2:Use ternary expressions instead: ExampleWrite "Hello" if
Run Example » Note that in order to embed a JavaScript expression inside JSX, the JavaScript must be wrapped with curly braces, Test Yourself With ExercisesExercise:Render a element without using JSX. const paragraph = React.createElement(, {}, 'This is a paragraph without using JSX!'); const root = ReactDOM.createRoot(document.getElementById('root')); root.render(paragraph); Start the Exercise Is JSX necessary for React?React doesn't require using JSX, but most people find it helpful as a visual aid when working with UI inside the JavaScript code. It also allows React to show more useful error and warning messages. With that out of the way, let's get started!
Should all React files be JSX?JSX isn't necessary to use as React can be written with both JS and JSX, but JSX makes it easier for users to make React applications, as it is similar to HTML. It makes it easier to write and update HTML code, thus functionality is easier to handle.
Why would you use JSX to create a React application?JSX is an abstraction that allows you to write HTML-like syntax in your JavaScript code and will enable you to build React components that look like standard HTML markup. JSX is the templating language of React elements, and is therefore the foundation for any markup that React will render into your application.
Is react native using JSX?React and React Native use JSX, a syntax that lets you write elements inside JavaScript like so:
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