What is Render in React JS? | Simplilearn (2024)

What Is Virtual DOM?

VDOM determines, as a Virtual "Document object Model library", that it Displays instances in the UI with the help of defined certain logic. We can also consider it as a library as ReactDOM.

The virtual DOM comprises the specific node tree, which has its elements and attributes with its properties and objects. Using the render() function, we can create a node using it is in-built react components and can do the modification of the node as per the action method in the data model. It is a light JavaScript object and can be consumed easily in different applications as per certain project requirements.

We can easily declare with the approach of React API functioning with DOM. It helps to maintain the event handling, and attribute manipulation in the code logic.

Here are the excellent advantages of Virtual DOM using React.JS

1. More Outstanding Performance

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.

2. Integrity and Simplicity

It is more beneficial for the developers that they can efficiently use the React and Virtual DOM in a simpler way with the help of JavaScript and it can easily integrate into the application with no interventions.

3. Efficiency

Virtual DOM has the ability to handle the data transformations in the React web application inside the view. Virtual DOM is consistently quicker than representing the UI in the original browser DOM.

4. CPU Intensive

Virtual DOM defines the various options of scripting, hence it helps to optimize the best browser compatibility features hence It is more CPU-intensive

5. Enhanced Memory Usage

The Virtual DOM produces more enhanced memory usage mechanisms in the applications. It helps to automate the data model using the trigger mechanism and loads the real-time data in the virtual web user interface.

Purpose of Render

We can use the ReactDOM.render() in the application using the declaration of HTML code and the HTML element. The goal of this function is to represent the imposed HTML code within the specified HTML element tags. It helps to redirect the HTML page with the help of the render() function.

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.

It helps to develop an application in a more presentable way using the below features:

• Open Source and Free
• Flexibility
• Decorators from ES7
• Server-side Intelligence
• Asynchronous Operations and Generators
• Flux Library Technique
• Restructuring Schemes
• Effectiveness of JSX

Example of Using Render in React JS

Here are samples of render in React JS:

Rendering an Element Using the DOM

• Declare this below code in your HTML using Div

<div id="Yourroot">

</div>

• To render or redirect the element use below code

const root = ReactDOM.createRoot(document.getElementById('Yourroot'));

const element = <h1>This is the initial example of React.JS</h1>;

root.render(element);

• After running the above code snippet it will display the below output:

Updating the Rendered Element Using the DOM

• Declare this below code in your HTML using Div:

<div id="yourroot">

</div>

• As we discussed, React elements are constant and unchangeable(immutable). Hence it can not be changed its attributes and children once it is defined. It can be displayed in the UI once your page loads.
• Here is below JS code for updating the render element:

const root = ReactDOM.createRoot(document.getElementById('yourroot'));

function Timertick() {

const Testelement = (

<div>

<h1>This is the example of updating the render using DOM</h1>

<h2>Here is the current time {new Date().toLocaleTimeString()}.</h2>

</div>

);

root.render(Testelement);

}

setInterval(Timertick, 1000);

• After running the above code it will display the below output:

Conclusion

We hope this article helped you understand Render in React JS. In this article, we discussed the various concepts of Render using React.JS with examples. This article will be helpful to professional developers from Java and .net backgrounds, application architectures, cloud specialists, testers, and other learners looking for various ways to use various types of Features of Render in React.JS.

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