![]() ![]() But if you only need a parent component somewhere to fulfill JSX syntax without the need for a key prop, then the short syntax is your best shot. So if you’re working with arrays and you want to use the Fragment component, you have to use the long version of it. The key prop is an important prop in React components that keeps React informed of which items have changed, being added or removed in a list. The downside to using this shortcut is that you cannot use the key prop. You don’t need to import the Fragment component from the React library. Instead of having to type “Fragment” all the time when you need it, you can simply use the empty fragment tag shortcut like this: But, after compilation, the Fragment component does not get to the DOM, thereby you can not use it on the UI. React Fragment only accepts the key attribute which every element, including the div also accepts. Only the div accepts classes that you can use to style the container or the children components. However, only the div can appear on the screen. React Fragment and div can both serve as parents for grouping children components in a valid JSX syntax. The div element on the other hand is an HTML element with no semantic meaning but when used, will be added to the DOM as a node. ![]() React Fragment is a component exposed by React which serves as a parent component in JSX but doesn’t add anything to the DOM. With this, only the h2, p and span elements are added to the DOM. The Fragment component as stated earlier also accepts the key attribute for which we added a the product’s id as the value. To access the Fragment component, you can either import it from the React library like this: You should use the React Fragment when you want to add a parent element to fulfill the JSX syntax, but without introducing an extra node to the DOM.Īfter compilation, the fragment component does not make it to the DOM-only the children element do. React Fragment was created to solve problems like this, where you do not want to introduce an extra element to the DOM, and you need a parent element. ![]() affect accessibility in cases where the additional nodes may conflict with your semantic elements.produce CSS conflicts if the extra node is not acknowledged in the style declaration.affect the performance of your application (if there are a lot of them in different parts of your application).Sometimes, you may not want that additional node.Īdding extra unnecessary nodes to the DOM can cause one or all of these three things: However, this would introduce an extra node to the DOM. This parent element could be a div, a span, or whatever element that is more semantically correct to serve as the parent. The solution to both blocks would be to add a parent element. The second one would throw an error because the two span expressions do not have a parent element. Please show your love and support by sharing this post.The first code block would throw an error because there is no parent element before the two child divs. It was published 29 Aug, 2020 (and was last revised 24 May, 2021). To make this work, you will have to substitute it with the full syntax like so: In such cases, react will show a warning that the key attribute is not present (since the empty tag syntax does not support keys). ![]() without the `key` attribute, React will trigger a warning To demonstrate this, let's suppose that in a collection of four navigation menu items you need the logo to appear in the center visually the code for that with empty tag syntax might look something like the following: However, since they're meant as a shorter syntax for, you may simply use the full syntax instead when you need to add an attribute (such as the key attribute). ) in react do not support keys or attributes. ![]()
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