Tips for looking up a class within the document and assigning it to a different element using JavaScript?

As someone new to javascript, I'm eager to create a code that will consistently search for a specific div class in an HTML file and then assign another class to my navigation if the required class is found. Although I attempted to write the code myself, unfortunately it doesn't seem to be functioning as intended.

function myFunction(e) {
  var element = document.getElementById('nav-verslui');
  var div = document.querySelector('div');

  if (div.classList.contains('privatiemsverslui-verslui999')) {
    element.classList.add('active-verslui');
  } else {
    element.classList.remove('active-verslui');
  }
};

Answer №1

If I were in your shoes, my approach would be to utilize querySelector by directly passing the class to it and then verifying if it retrieves an element:

let targetDiv = document.querySelector(".privatiemsverslui-verslui999");
if (targetDiv == null) {
    // No element found with that class
}
else {
    // The element does exist.
}

The method you were employing would have only returned the initial div present in the DOM and verified if that specific div contained the class. It wouldn't have traversed through the entire document.

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