Use cases of Observeation API
- Detect the presence of specific elements (e.g.; add banners ) and take action if they are removed by ad blockers.
- detect any type of DOM modifications
- Used to implement auto-save functionality in online code editors (e.g.’; Leetcode, Hackerrank, GFG, etc).
- Detect UI updates of multiple elements on real real-time basis.
- Monitor input field for changes and validate user input in real-time, showing them error messages and feedback if required.
- Besides the above-mentioned use cases, limitless new functionalities can be implemented with the help of mutation observers.
Web API Mutation Observer
Mutation Observer is a web API (web APIs are APIs provided by the browser itself) that is used to observe (i.e.; detect) the changes of the target HTML element within a web page. For example, when the user wants to know which element has recently been removed and which element has been added to the DOM, we can use Mutation Observer. In dynamic websites, we know that elements are added, removed, or modified dynamically, this API serves as a tool for tracking and reacting to these changes. In this article, we will see the Mutation Observer in the Web API, along with understanding its benefits, use cases, instance methods, & etc.