Home Web Front-end JS Tutorial How to Detect Element Addition to Web Pages as a Browser Extension Using Periodic Checking?

How to Detect Element Addition to Web Pages as a Browser Extension Using Periodic Checking?

Oct 21, 2024 am 08:50 AM

How to Detect Element Addition to Web Pages as a Browser Extension Using Periodic Checking?

Detecting Element Addition on a Web Page as a Browser Extension

To notify oneself upon addition of a DOM element to a page, consider the following approach:

Option 1: DOM Mutation Events (Deprecated)

Previously, mutation events provided a method for monitoring DOM changes. However, their deprecation in 2012 precludes their use.

Option 2: Periodic Checking

Due to the independent nature of web pages and the inability to modify their source in a browser extension context, periodic checking remains the only viable solution.

Implement a function checkDOMChange() to:

  • Continuously check for new elements being inserted or specific nodes being modified.
  • Recursively call itself every 100 milliseconds (1/10th of a second) to ensure ongoing monitoring.
<code class="python">function checkDOMChange() {
    // Check for element insertion or node modification

    // Recursively call the function after 100 milliseconds
    setTimeout(checkDOMChange, 100);
}</code>
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Note: While periodic checking may not be as efficient as real-time observation, it should suffice for most use cases where immediate notification is not critical.

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