With the popularity of React, the internals and implementation of Virtual DOM has becoming top discussed topic in tech communities and interviews. This post will give an introduction of Virtual DOM and how to implement a simple Virtual DOM logic.How to understand Virtual DOMIn early days, front end developers would update a webpage view based on the data status change(usually after making AJAX call). But it brings performance penalties when there is frequent update as it would cause page reflow and repaint and in turn lead to page stuck.Hence people comes out a solution which is to just update...

In some cases, one would want to convert a HTML string to the DOM elements so that JavaScript can handle them easily. This is frequently used when one get some data from third party APIs where the data is in HTML format.In JavaScript, there are a couple of ways one can use to convert HTML to DOM elements.DOMParserdocument.createElementDOMParserDOMParser can parse XML or HTML source stored in a string into a DOM Document. After the conversion, the normal JavaScript call of handling DOM elements can be used, like getting element by id or using selectors.For example, assuming there...