Prevent Mouseenter bubbling in an unorderest list of links in Vue 3

Question

I have tried a lot of different things trying to stop event bubbling on the mousenter event but still have the problem, when I hover on a link the event triggers for all the links, like all of them were hovering at the same time. Is an unordered list of links and I'm using a computed value to dynamically change the inline styles when I hover the links:

My component is something like this:

      <section class="categoryList">
        <ul>
          <li v-for="category in categories" :key="category.id">
            <a
              @mouseenter.stop="mouseOver()"
              @mouseleave.stop="mouseOver()"
              class="category"
              :style="getStyle"
              href="#"
              @click.prevent="getCategory(category.name)"
              >{{ category.name }}</a
            >
          </li>
        </ul>
      </section>

And this is the computed value:

const getStyle = computed(() => {
  if (props.primaryColor != undefined && props.primaryColor != "") {
    if (!hover.value) {
      return `background-color:${props.primaryColor};color:${props.secondaryColor}`;
    } else {
      return `background-color:${props.secondaryColor};color:${props.primaryColor}`;
    }
  } else {
    if (!hover.value) {
      return `background-color:#614EFB;color:white`;
    } else {
      return `background-color:#523dfa;color:white`;
    }
  }
});

And then a standard function to control the hover state dynamically:

function mouseOver() {
  hover.value = !hover.value;
}

Answer 1

If I understood you correctly try to set hover as id instead of boolean:

const { ref, computed } = Vue
const app = Vue.createApp({
  setup()  {
    const props = ref({primaryColor: null, secondaryColor: null})
    const categories = ref([{id: 1, name: 'aaa'}, {id: 2, name: 'bbb'}, {id: 3, name: 'ccc'}])
    const hover = ref(null)
    function mouseOver(id) { hover.value = id; }
    function mouseExit() { hover.value = null }
    getCategory = () => {}
    const getStyle = (id) => {
      if (props.primaryColor != undefined && props.primaryColor != "") {
        if (id !== hover.value) {
          return `background-color:${props.primaryColor};color:${props.secondaryColor}`;
        } else {
          return id === hover.value && `background-color:${props.secondaryColor};color:${props.primaryColor}`;
        }
      } else {
        if (id !== hover.value) {
          return `background-color:#614EFB;color:white`;
        } else {
          return `background-color:red;color:white`;
        }
      }
    };
    return { props, categories, mouseOver, getStyle, getCategory, hover, mouseExit }
  }
})
app.mount('#demo')

<script src="https://unpkg.com/vue@3/dist/vue.global.prod.js"></script>
<div id="demo">
  <section class="categoryList">
  <ul>
    <li v-for="category in categories" :key="category.id">
      <a
        @mouseenter="mouseOver(category.id)"
        @mouseleave="mouseExit()"
        class="category"
        :style="getStyle(category.id)"
        href="#"
        @click.prevent="getCategory(category.name)"
        >{{ category.name }}</a
      >
    </li>
  </ul>
  {{hover}}
</section>
</div>