Virtual DOM

Real DOM

Real DOM is the actual structure of the webpage. React Update complete document in the Real DOM. React DOM is the actual webpage rendered on the browser any changes made directly reflect on the complete webpage. The DOM represents the web page often called a document with a logical tree and each branch of the tree ends in a node and each node contains objects. The developer can modify the content of the document using a scripting language like JavaScript. The changes and updates to the DOM are fast because of its tree-like structure but re-rendering whole documents makes the DOM Slow. All UI components need to be re-rendered for every DOM update....

Virtual DOM

Virtual DOM is the virtual representation of Real DOM React update the state changes in Virtual DOM first and then it syncs with Real DOM Virtual DOM is just like a blueprint of a machine, can do changes in the blueprint but those changes will not directly apply to the machine. Virtual DOM is a programming concept where a virtual representation of a UI is kept in memory synced with “Real DOM ” by a library such as ReactDOM and this process is called reconciliation Virtual DOM makes the performance faster, not because the processing itself is done in less time. The reason is the amount of changed information – rather than wasting time on updating the entire page, you can dissect it into small elements and interactions...

Methods of DOM

write(“string”): Writes in document area writeln(“string”): Writes in a new line in the document area getElementById(“id”): Returns the element with the passed ID getElementByName(” name” ): Returns the element with the passed name getElementByTagName(“tagname”): Returns the element with the passed tag name getElementByClassName(“classname”): Returns the element with the passed class name...

Differences between Real Dom and Virtual Dom

Real DOM Virtual DOM Real DOM represent actual structure of the webpage. Virtual DOM represent the virtual/memory representation of the Webpage. DOM manipulation is very expensive  DOM manipulation is very easy  There is too much memory wastage  No memory wastage  It updates Slow It updates fast It can directly update HTML It can’t update HTML directly   Creates a new DOM if the element updates. Update the JSX if the element update  It allows us to directly target any specificnode (HTML element) It can produce about 200,000 Virtual DOMNodes / Second. It represents the Ul of your application It is only a virtual representation of the DOM...