In this article (which is largely inspired by a coding talk by Tejas Kumar, link at the bottom) we will look into the internals of the virtual DOM and what it actually is. The render() method of React creates a node tree from React components and updates this node tree due to the mutations caused by actions in the data model. React.js maintains 2 virtual DOM at any instance of time. This object has three properties -> tag, props and children. That is, for example you have a div and inside it you have another div and inside it you have 3 paragraph tags , the DOM tree for this would be a tree with a div as the root, another div as child and 3 paragraph nodes as the children of that second div (also act as the leaves of the tree). Even though I hope that all of you know what a DOM is, I still will briefly tell you to refresh your memory or in the slight case that you do not know what it is altogether. The fact to consider is that React is keeping two Virtual DOM trees in memory. You also have the option to opt-out of these cookies. This is where the real benefits — both in performance and productivity — lie in React. It is mandatory to procure user consent prior to running these cookies on your website. One of them is the updated state virtual DOM and other is the previous state virtual DOM. The Virtual DOM adds a layer of scripting to the optimizations the browser carries out to make the DOM manipulations transparent to the developer. Necessary cookies are absolutely essential for the website to function properly. Upgrade Your Business to Kentico - A Feature-Rich Content Management System. Another notable feature is the use of a virtual Document Object Model, or virtual DOM. This simplicity can free up significant mental resources and make optimizing the user interface easier. React’s Virtual DOM provides a more efficient way of updating the view in a web application. It's more common to work with the virtual DOM via a framework, rather than interfacing with it directly as I showed in the example above. Frameworks such as React and Vue use the virtual DOM concept to make more performant updates to the DOM. Thus, Virtual DOM in React provides benefits in both performance and productivity. Only those differences are then changed in the real DOM , making this change much faster. This website uses cookies to improve your experience while you navigate through the website. So, what is it useful for? Due to the Virtual DOM, each change in the data model can trigger a complete refresh of the virtual user interface.
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