Pass data from child to parent in Vuejs (is it so complicated?) - vue.js

Question

I have read about it:
vuejs update parent data from child component
https://forum.vuejs.org/t/passing-data-back-to-parent/1201/2
The concept is the same, I need to pass a data object from child to parent. I have used $emit to pass data to parent component but it doesn't works. Do you know what is wrong? You can check my code here:
Vue.component('list-products', {
delimiters: ['[[', ']]'],
template: '#list-products-template',
props: ['products'],
data: function () {
return {
productSelected: {}
}
},
methods: {
showDetailModal: function (product) {
console.log('click product in child, how can i pass this product to productSelected data in parent?');
console.log(product);
this.productSelected = product;
this.$emit('clickedShowDetailModal', product);
}
}
});
var app = new Vue({
delimiters: ['[[', ']]'],
el: '#resultComponent',
data: {
listProducts: [
{'name':'test1',id:1},
{'name':'test2',id:2},
{'name':'test3',id:3}
],
productSelected: {}
},
methods: {
clickedShowDetailModal: function (value) {
console.log('value');
console.log(value);
this.productSelected = value;
}
}
});
<script src="https://unpkg.com/vue/dist/vue.js"></script>
<div id="resultComponent" data-toggler=".small-up-2" class="row small-up-1">
<list-products :products="listProducts"></list-products>
</div>
<script type="text/x-template" id="list-products-template">
<div>
<div class="column column-block" v-for="(product, index) in products" :product="product" :index="index" :key="product.id">
<li class="more-benefits">
<a #click="showDetailModal(product)">Click me [[ product.name ]] and check console.log »</a>
</li>
</div>
</div>
</script>

Answer 1

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
}
}
}

Answer 2

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.

Answer 3

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/vue#2.5.13/dist/vue.js"></script>
codepen: https://codepen.io/ezra_siton/pen/YzyXNox?editors=1010