Pass data from child to parent in Vuejs (is it so complicated?)

Props are for parent -> child

You can use $emit for child -> parent

v-on directive captures the child components events that is emitted by $emit

Child component triggers clicked event :

export default {
   methods: {
     onClickButton (event) {
         this.$emit('clicked', 'someValue')
     }
   }
}

Parent component receive clicked event:

<div>
    <child @clicked="onClickChild"></child>
</div>

...

export default {
  methods: {
      onClickChild (value) {
          console.log(value) // someValue
      }
  }
}

You aren't listening to the event. I changed the event name to clicked-show-detail. Try this.

In the showDetailModal method of your component.

this.$emit('clicked-show-detail', product);

In your Vue.

<list-products :products="listProducts" @clicked-show-detail="clickedShowDetailModal"></list-products>

Example.

Nightmare to find "hello world" example out there for $emit so I added the example below (Minimal lines of code + semantic names of functions).

"Hello world" On click change parent data

Vue.component('child', {
  template: `
<div class="child">
<button v-on:click="childMethod">CLICK - child Method pass data from product component</button>
</div>
`,
  data: function () {
    return {
      child_msg: "message from child"
    }
  },
  methods: {
    childMethod: function() {
      this.$emit('child-method', this.child_msg)
    }
  }
})

var app = new Vue({
  el: '#app',
  data: {
    msg: "I am the blue parent!!!!!!!!!!!!!!!!!!",
  },
  methods: {
    updateParent(value_from_child) {
      this.msg = value_from_child;
      alert("hello child" + value_from_child)
    }
  }
})

.child{ background: gray; padding: 15px; }
button{ cursor: pointer; }
#app{ border: 1px red dashed; padding: 15px; background: lightblue; color: blue;
}

<div id="app">
  <p>{{msg}}</p>
  <!-- ###### The trick happens her ###### -->
  <child class="child" v-on:child-method="updateParent"></child>
</div> 

<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/vue.js"></script>

codepen: https://codepen.io/ezra_siton/pen/YzyXNox?editors=1010