![]() standard onDblClick should be used instead of React's onDoubleClick ( only if preact/compat is not used).standard onInput should be used instead of React's onChange for form inputs ( only if preact/compat is not used).events don't bubble up through components.Standard browser events work very similarly to how events work in React, with a few small differences. See MDN's Event Reference for a full list of DOM event handlers. Preact uses the browser's standard addEventListener to register event handlers, which means event naming and behavior works the same in Preact as it does in plain JavaScript / DOM. React Fragments Example 3 by SitePoint ( CodePen.The main difference between Preact and React is that Preact does not implement a synthetic event system for size and performance reasons. 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. Please note that this is not the case while using the short syntax.įor example, let’s 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. Let’s 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, don’t think of Rect Fragments as a replacement for the s in your HTML. īasically, 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. Here’s the code you might use for this: function Table ( ) Second, such an approach can lead to invalid HTML, as you’re going to see.įor example, let’s say you have a Table component which renders an HTML table, whose columns are rendered with another component called Columns. First, by using this approach consistently, you’re 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. As stated in the official React documentation, returning more than one HTML element is a commonly desired behavior for React components. ![]()
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