[Vuejs]-Function is defined but never used in the script section of a Vue component

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You have to define the function in the methods object. Or – if you use the composition-api – return the function from the setup fuction.

<script>
let navbar_nav = document.getElementById("navbar_nav");

export default {
  methods: {
    update_nav_bar(elem) {
      navbar_nav.getElementsByClassName("active")[0].classList.remove("active");
      elem.classList.add("active");
    }
  }
}
</script>

But maybe you should rethink the function in general. Usually you can achieve this without manipulating the DOM manually with JavaScript.

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