![]() Social media preview: Photo by Julia Kadel ( Unsplash). In that case, you’ll need to keep track of an array of parents rather than just one. This won’t work if a popper is nested three levels or deeper. When any popper shows, it hides all other poppers except its parent. When the popper is created, it sets the context to itself, meaning any nested poppers will later be able to reference this parent popper. Creating a Contextįirst, we’ll create a simple React context that stores a boolean value: import To use it, you need two things: A provider. Let’s take it one step at a time and understand how this works. Reacts context API allows you to share data on a global level. Internally, the same component will also consume its own context.The component in question (e.g., Button) will render the context provider.You do that by using the function createContext which exists in the React package: import. But before you can do any of this, you need to create the context itself. You can create consumers in two different ways, either as a hook or by using a render prop. We’ll create a React Context that stores a boolean value. As mentioned, to use React context, you need to create a provider and a consumer.Using Context to Detect Nested Components They can also easily be missed if a developer isn’t constantly monitoring their dev tools as they’re building a page. To React’s credit, it already shows built-in console warnings ( validateDOMNesting) when you attempt to render an invalid DOM structure, but these warnings do little to discourage misuse. Linters will only catch such a failure if it’s in a single file, but components can be nested arbitrarily deep, across multiple files. For example, buttons cannot have interactive children (e.g., other buttons), but there are no guardrails in HTML, browsers, or frameworks like React that prevent developers from violating this rule. ![]() More specifically, we’ll use React Context to detect if a component is nested within another instance of itself, which can be useful for DOM validation. In this article, I want to demonstrate how React Context can be used to detect whether a component has a particular parent somewhere higher up in the DOM. Then in all components in this sub-tree, you are able to get the data thanks to a Consumer. Conceptually, you will put data in a React context and provides it to a React sub-tree component thanks to a Provider. But the Context API also has some other interesting uses (and, admittedly, abuses). Context provides a way to pass data through the component tree without having to pass props down manually at every level. Without this API, you would either need to drill the prop through several intermediate children or read this data from a global store with a higher-order component or hook. The React Context API was created to solve the problem of prop drilling, where you need to pass a prop from a parent high up in the tree to a descendant lower in the tree. ![]()
0 Comments
Leave a Reply. |