How to Find the Script Element That Loaded the Currently Executing JavaScript?

How to Reference the Script Element That Loaded the Currently Executing Script

Understanding the Issue

In certain scenarios, developers may need to dynamically load additional scripts into the document. However, the conventional method of using document.getElementsByTagName('head')[0].appendChild(v) may not be suitable if the HEAD element has yet to be fully rendered.

Solution: Referencing the Current Script

To reference the script element that loaded the currently executing script, several techniques can be employed:

1. document.currentScript

Advantages:

• Simple, explicit, and reliable
• Doesn't require modifying the script tag
• Works with asynchronous scripts (defer & async)
• Works with scripts inserted dynamically

Limitations:

• Not supported in older browsers or IE
• Doesn't work with modules (
  

  6. Last Executed Script

  Advantages:

  • Simple
  • Nearly universally supported
  • No custom attributes or ID required

  Limitations:

  • Does not work with asynchronous scripts (defer & async)
  • Does not work with scripts inserted dynamically

  <br><script><br>var scripts = document.getElementsByTagName( 'script' );<br>var me = scripts[ scripts.length - 1 ];<br></script><br>

  Conclusion

  The choice of method to reference the current script element depends on the specific requirements of the application and support for various browsers. For modern browsers, document.currentScript is the preferred approach.

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