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Why am I getting an \"getElementByClass is not a function\" error when trying to access elements by class?

Mary-Kate Olsen
Mary-Kate OlsenOriginal
2024-11-04 01:04:30231browse

Why am I getting an

How to Effectively Acquire an Element by Its Class Designation

Problem Statement:
Attempts to obtain an element by its class name using the syntax "document.getElementByClass()" result in an "getElementByClass is not a function" error.

Answer:
To successfully access an element by its class, the proper DOM function to employ is "getElementsByClassName," accommodating the possibility of multiple elements sharing the same class. This function returns a NodeList, which can be further manipulated as needed.

Alternative Approaches:
For improved compatibility and performance, consider utilizing querySelector('.foo') or querySelectorAll('.foo'), as recommended by caniuse.com.

Additional Resources:

  • [MDN Documentation: getElementByClassName](https://developer.mozilla.org/en-US/docs/Web/API/Document/getElementsByClassName)
  • [MDN Documentation: NodeList](https://developer.mozilla.org/en-US/docs/Web/API/NodeList)
  • [Can I Use: Method Support](https://caniuse.com/#search=getElementsByClassName)

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