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Key prop on react fragment8/31/2023 ![]() ![]() React Fragments Example 3 by SitePoint ( CodePen. This is where React Fragments can come into play, allowing you to more easily render groups of elements and avoid adding unnecessary extra tags, just like in the following example: When it comes to conditional rendering, React requires you to return a single element in both branches. React Fragments Example 2 by SitePoint ( CodePen. Since React Fragments support the key props, you can harness them to achieve so without introducing any extra markup. This can be achieved by mapping each array element to a corresponding HTML element, which is required by React to have a unique key. Your goal is to render all authors using the data in this array. Another common mistake in React is the improper use of fragments, which are a lightweight syntax for grouping multiple elements under a common parent without adding any extra nodes to the DOM tree. Please note that this is not the case while using the short syntax.įor example, letâs say you have an array of objects where each element represents an author. React Fragments Example 1 by SitePoint ( CodePen.Īs stated in the React documentation, Fragments declared with the explicit syntax may have keys, and this is useful when dealing with any JavaScript collection. Letâs see them in action while defining a component returning four HTML elements. As seen before, this is the recommended approach, since using any other wrapper tag can lead to invalid HTML. Whenever you have to define a React component that needs to return multiple HTML elements, you should wrap them with the or tag. Wrapping multiple HTML elementsĪs you might have guessed, wrapping multiple HTML elements is the most common use case of React Fragments. There are three use cases where React Fragments are commonly used. On the contrary, see them as a way to avoid unnecessary tags and to get a better markup structure as a result. So, donât think of Rect Fragments as a replacement for the s in your HTML. Ä«asically, you should use React Fragments any time you would otherwise introduce an unnecessary wrapper to make your component return more than one HTML element. So, keep in mind that the empty tag is a shorthand for. This leads to the same result as the example above. Hereâs the code you might use for this: function Table ( ) ![]() ![]() First, by using this approach consistently, youâre making your DOM more nested, and consequently slower to be rendered. From a logical point of view, this extra can usually be considered irrelevant, but it does have consequences. The easiest solution would be to use a wrapper. This is because React requires that components return only one HTML element. To achieve this, you must wrap all these elements with an HTML tag. For simplicityâs sake the keyboard events to enable arrow key interaction of the popover options have not been implemented. Also note the added aria- props to support screen-reader users. As stated in the official React documentation, returning more than one HTML element is a commonly desired behavior for React components. This code exposes the functionality to both pointer device and keyboard users. ![]()
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