How to Detect Browser Tab Focus for Performance Optimization?

Focusing on Browser Tab Focus Detection

In today's multi-tabbed browsing era, many applications require a way to detect when their tab has focus. This can be especially beneficial for efficiency purposes, such as throttling background activities when the tab is not active.

One common approach to detecting tab focus is utilizing the browser events window.onfocus and window.onblur. These events are triggered when the tab gains or loses focus, respectively. They offer a simple and reliable way to track tab activity across different browsers.

In the case of stock price polling, implementing these events can significantly reduce unnecessary traffic noise by pausing the polling when the tab is not in focus. This solution is both efficient and user-friendly, allowing users to have multiple tabs open without performance degradation.

To set up this functionality, simply add these event listeners to your application:

window.addEventListener("focus", function() {
  // Tab has focus, resume polling
});

window.addEventListener("blur", function() {
  // Tab lost focus, stop polling
});

By leveraging window.onfocus and window.onblur, developers can monitor tab focus changes and optimize their applications to deliver a more efficient and seamless user experience.

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