Vue js pass a function from child chile to another child component on a click event

I am trying to pass a function when a button is clicked, the button is clicked in a child element, then passed through a parent element to another child component, and i dont want to use the store for that, How can i do that?

components/footer/footer.vue — This is where the button is clicked

<template>
    <div class="footer-bottom-header-menu-bar mob"  @click="showMenu">
        <img src="~/assets/svg/menubar.svg" alt="+" />
    </div>
</template>

<script>
export default {
    methods: {
        showMenu() {
            this.$emit("show-menu");
        }
    }
}
</script>

layouts/default.vue –This is the parent component where that receives the click function and is to pass it into the app-header

<template>
    <div>
        <app-header />
        <Nuxt />
        <app-footer @show-menu="showMenu()"/>
    </div>
</template>

<script>
import header from "~/components/header/header";
import footer from "~/components/footer/footer";

export default {
    components: {
        'app-header': header,
        'app-footer': footer
    },
    methods: {
        showMenu() {
            console.log("clicked");
        }
    }
}
</script>

components/header/header.vue — I want the click function to perform an action inside this component

<script>
export default {
    data() {
        return {
            showMenuBar: false
        }
    },
}
</script>

Answer

You can declare any attribut on your parent component:

data() {
    return { toBeWatched: 0 };
}

• Then pass it like a props from the parent to the header child:
  <app-header :Trigger="toBeWatched" />
• When you listen to the @show-menu event (comming from footer child), make any change on your attribut:
  <app-footer @show-menu="toBeWatched++" />
• Finally you can watch for this change on your header child and trigger your function.

<script>
export default {
    data() {
      return {
        showMenuBar: false
      };
    },
    props: ['Trigger'],
    watch: {
      Trigger() {
        this.showMenuBar = !this.showMenuBar; // or do whatever you want
        console.log('showMenuBar : ' + this.showMenuBar);
      }
    }
};
</script>