ReactJS Render vs Return Methods

If you need the latest available data on a page, you’d be better suited with something like SSR that fetches the latest data for each request. Security can be a pro or a con for SSG depending on your needs. Since your site is only serving static files, there are fewer attack vectors uses of rendering for malicious agents. In React class components, the “Render” method Returns JSX that defines the component’s UI. This method is automatically called when a component needs to update or re-Render. In other circumstances, the Return method might not be the best option.

However, if executed well, it may be beneficial to render a “shell” of the application on the server, and only show some of the extra widgets on the client. To learn how to do this without getting the markup mismatch issues, refer to the explanation in the previous paragraph. To create a functional component we use a plain function, rather than an options object. The function is effectively the render function for the component. Make sure to return a function instead of directly returning values! The setup() function is called only once per component, while the returned render function will be called multiple times.

Render Function Recipes ​

React isn’t an MVC (Model View Controller) framework, but its architecture allows developers to write clean code by easily differentiating between the template, JavaScript, and styles. The render method contains the JSX template of the app comprised of all DOM elements. In order to execute JavaScript in your app, dedicated methods called lifecycle methods are used. This guide sheds more light on these methods and their use cases, allowing you to understand where to write your JavaScript after the DOM has rendered.

In that case, it makes sense to rename the prop to be called initialColor or defaultColor. You can then force a component to “reset” its internal state by changing its key when necessary. The constructor for a React component is called before it is mounted.

Error boundaries

It can be immutable in a certain scenario when you create an element and then you can define it as constant, hence it would not allow changing this. Before coming into the depth we need to understand React.JS which is an open-source JavaScript library that we can use to develop interactive user interfaces. If you’re venturing into React development and want to enhance your skills, mastering the Render method is a great starting point. However, if you find yourself in a particular situation where the Return method fits perfectly, don’t hesitate to go for it.

You’d seamlessly employ the Return method to achieve this outcome in such instances. UI Rendering is critical in the ReactJS framework, serving as the gateway to what’s showcased on the screen. This method takes the application’s state as input and visually Renders it onto a designated DOM node. This innate mechanism offers an effortless means of monitoring your application’s dynamics since the Render process perpetually mirrors the most up-to-date state.

constructor()

Then the server renders the page in its entirety, outputting the final HTML and any assets and other scripts required to run the client. Then this final completed page is sent back to the browser, ready to display. Because of the multi-step process required to download and execute the JavaScript for the page to render, CSR has the slowest initial rendering time of all the methods listed today. No, the “Render” method is exclusive to class components, while the “Return” statement is specific to functional components. The “Render” method is used in class components, whereas functional components use the “Return” statement to describe what to display. The JavaScript code may load significantly later than the initial HTML render, so if you render something different in the client-only pass, the transition can be jarring.

• On production, instead, the errors will not bubble up, which means any ancestor error handler will only receive errors not explicitly caught by componentDidCatch().
• FlushSync may also run pending effects and synchronously apply any updates they contain before returning.
• But then that leaves a big hole, like how you handle lifecycle / effect methods etc, and that’s were Hooks come in.

That brings us to the end of our look at JavaScript rendering, the possible methods for doing it, and our review of each one of the methods. Hopefully, after reading this post, you better understand all of the rendering methods that can be used in JavaScript and when you might want to use them. In terms of SEO, SSG is similar to SSR, with no SEO issues or problems.

Situations to Avoid Using the Render Method

This lifecycle is invoked after an error has been thrown by a descendant component. It receives the error that was thrown as a parameter and should return a value to update state. This method exists for rare use cases where the state depends on changes in props over time.

Make sure to compare the current and next values if you only want to handle changes. In the event of an error, you can render a fallback UI with componentDidCatch() by calling setState, but this will be deprecated in a future release. Use static getDerivedStateFromError() to handle fallback rendering instead.

As of React 16, a component may return a fragment with multiple children, in which case findDOMNode will return the DOM node corresponding to the first non-empty child. You are kind of correct, if you mean a class (constructor) can’t return something, well it can, but it’s not advised to do so. And since in React render can be called multiple times, it certainly wound’t make sense for it to be in the constructor anyway. Functional components can be registered and consumed just like normal components. If you pass a function as the first argument to h(), it will be treated as a functional component. Create-vue and Vue CLI both have options for scaffolding projects with pre-configured JSX support.

Virtual DOM provides amazing performance using the setState() procedure. We can easily create this method and can render it using the virtual DOM tree within the memory. Within React development, the Return method assumes the role of a conduit for relaying data from a component. It channels the data furnished to the component, making it accessible for utilization by the parent component.

Whatever rendering method you choose, something to bear in mind is that it’s often not a case of picking one method and forgoing the others in their entirety. Many modern JavaScript frameworks like Next.js and Gatsby, let you combine rendering methods throughout a website. This flexibility allows us to get the best of each of the methods to deliver the best final product for users.