Is there a js library to run js in only one tab?

Question

JavaScript

Situation: there is a js code that listens to events on websockets when a page is opened. When opening an additional tab with the same page, one more websocket connection will be opened, and this is superfluous, because. when an event arrives via websocket, notifications are shown, i.e. there will be overlap.
Is there a js library that keeps track that there is an open page in a tab? And executes the code if there is no other tab or that tab is closed?

Answer 1

https://github.com/ai/visibilityjs
https://github.com/studentIvan/dueljs

Answer 2

You need a Master / Slave, you can implement it using:
- SharedWorker + fallback in localStorage and / or LocalConnection (Flash) - if you do it yourself
- BNC Connector - theprivateland.com/bncconnector/home.htm
- Intercom.js - https:// github.com/diy/intercom.js/ (working with sockets out of the box)
- Wormhole.js - https://github.com/RubaXa/wormhole (in development, demo )