How do you trigger a function in a child component that was imported when a parent element is clicked?

Is it possible to access and call a function in an imported component from the "parent element"? I have multiple modules that I want to include dynamically in my app. I thought that if I import a component like Header in my main App.vue file, it would recognize the function from the main App.vue file.

Here is an example of the App.vue file structure:

<template>
  <div>
    <div class="m-grid m-grid--hor m-grid--root m-page">
        <!-- <loader></loader> -->
        <mobile-menu-partial></mobile-menu-partial>
        <header-partial></header-partial>
            <div :is="currentComponent"></div>
            <div v-show="!currentComponent" v-for="component in componentsArray" :key="component.id">
                <button @click="swapComponent(component)">{{component}}</button>
            </div>
            <button @click="swapComponent(null)">Close</button>
        <footer-partial></footer-partial>
    </div>
  </div>
</template>

<script>
import Loader from '@/components/partials/Loader.vue'
import MobileMenu from '@/components/partials/MobileMenu.vue'
import Header from '@/components/partials/Header.vue'
import Footer from '@/components/partials/Footer.vue'
export default {
  data () {
    return {
      currentComponent: null,
      componentsArray: ['dashboard', 'schedule', 'locations', 'mileage']
    }
  },
  name: 'App',
  components: {
    'loader': Loader,
    'mobile-menu-partial': MobileMenu,
    'header-partial': Header,
    'footer-partial': Footer
  },
  methods: {
    swapComponent: function (component) {
      console.log('component', component)
      this.currentComponent = component
      if (component === null) {
        console.log('anywhere_main')
        this.$router.push('/')
      } else {
        this.$router.push('/' + component)
      }
    }
  }
}
</script>

<style>
</style>

Therefore, my question is: Can I access and utilize the function swapComponent in my header-partial component? This is essential for handling the opening of modules within the app.

Answer №1

Accessing child component's method from parent component

Imagine you have a component called child-comp and you need to invoke its childMethod from the parent component.

To achieve this, use ref="someVariableName" in the parent's template and then access it using this.$refs.someVariableName in the parent's JavaScript.

Parent's template:

<div id="app>
   <child-comp ref="myChild"></child-comp>
   <button @click="callChildMethod">GO</button>
</div>

Parent's JavaScript code:

{
  data: // ...
  // ...
  methods: {
    callChildMethod: function () {
      this.$refs.myChild.childMethod();
    }
}

Invoking parent's method from child

To trigger a parent method from a child component, emit an event in the <child-comp> and then listen for it in the parent component.

Parent's template (listening to an event):

<div id="app>
   <child-comp @eventname="parentsMethod"></child-comp>
</div>

It's important to note that @eventname="parentsMethod" is the same as v-on:eventname="parentsMethod".

Parent's JavaScript code:

{
  data: // ...
  // ...
  methods: {
    parentsMethod: function (event) {
      console.log('parent called', event);
    }
}

Child's JavaScript code:

{
  data: // ...
  // ...
  methods: {
    someChildMethod: function () {
      this.$emit('eventname', {some: 'object value'});
    }
}

So, whenever the someChildMethod is called in the child component, it will trigger the event that the parent component is listening to, and then execute the parentsMethod in the parent component.

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