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How to pass Books array length to the parent component from child component in vue.js?

I am developing one page which is responsible from displaying books and the response is coming from backend API, DisplayBooks.vue component is imported inside a Dashboard.vue (parent-component).inside DisplayBooks.vue it contains books [] array , i want to pass this length to the Dashboard.vue component ,How to acheive this thing please help me to fix this thing..
Dashboard.vue
<template>
<div class="main">
<div class="navbar navbar-default navbar-fixed-top">
<div class="navbar-header">
<img src="../assets/education.png" alt="notFound" class="education-image" />
</div>
<ul class="nav navbar-nav">
<li>
<p class="brand">Bookstore</p>
</li>
</ul>
<div class="input-group">
<i #click="handlesubmit();" class="fas fa-search"></i>
<div class="form-outline">
<input type="search" v-model="name" class="form-control" placeholder='search...' />
</div>
</div>
<ul class="nav navbar-nav navbar-right" id="right-bar">
<li><a> <i class="far fa-user"></i></a></li>
<p class="profile-content">profile</p>
<li #click="shownComponent='Cart'"><a><i class="fas fa-cart-plus"></i></a></li>
<p class="cart-content" >cart <span class="length" v-if="booksCount">{{booksCount}}</span></p>
</ul>
</div>
<div class="mid-body">
<!-- i want to display books length here -->
<h6>Books<span class="items">({{books.length}})</span></h6>
<select class="options" #change="applyOption">
<option disabled value="">Sort by relevance</option>
<option value="HighToLow">price:High to Low</option>
<option value="LowToHigh">price:Low to High</option>
</select>
</div>
<div v-if="flam==false">
<h2>Hello</h2>
</div>
<DisplayBooks v-show="flag==='noOrder' && shownComponent==='DisplayBooks'" #update-books-count="(n)=>booksCount=n" />
<Cart v-show=" shownComponent==='Cart'" />
<sortBooksLowtoHigh v-show="flag==='lowToHigh'" #update-books-count="(n)=>booksCount=n" />
<sortBooksHightoLow v-show="flag==='highToLow'" #update-books-count="(n)=>booksCount=n" />
</div>
</template>
<script>
import sortBooksLowtoHigh from './sortBooksLowtoHigh.vue'
import sortBooksHightoLow from './sortBooksHightoLow.vue'
import DisplayBooks from './DisplayBooks.vue'
import Cart from './Cart.vue'
export default {
components: {
DisplayBooks,
sortBooksLowtoHigh,
sortBooksHightoLow,
Cart
},
data() {
return {
shownComponent:'DisplayBooks',
booksCount:0,
flag: 'noOrder',
brand: 'Bookstore',
name: '',
flam: true,
visible: true,
}
},
methods: {
flip() {
this.flam = !this.flam;
},
applyOption(evt) {
if (evt.target.value === "HighToLow") {
this.flag = 'highToLow';
} else this.flag = 'lowToHigh';
},
}
}
</script>
DisplayBooks.vue
<template>
<div class="carddisplay-section">
<!-- <div class="mid">
<h6>Books<span class="items">({{books.length}})</span></h6>
</div> -->
<div v-for="book in books" :key="book.id" class="card book" >
<div class="image-section" #mouseover="book.hover = true" #mouseleave="book.hover = false">
<div class="image-container">
<img v-bind:src="book.file" />
</div>
</div>
<div class="title-section" >
{{book.name}}
</div>
<div class="author-section">
by {{book.author}}
</div>
<div class="price-section">
Rs. {{book.price}}<label class="default">(2000)</label>
</div>
<div class="buttons">
<div class="button-groups" v-if="!addedBooks.includes(book.id)">
<button type="submit" #click="handleCart(book.id);toggle(book.id);addedBooks.push(book.id)" class="AddBag">Add to Bag</button>
<button class="wishlist">wishlist</button>
</div>
<div class="AddedBag" v-else>
<button class="big-btn" #click="removeFromCart(book.id);addedBooks=addedBooks.filter(id=>id!==book.id)">Added to Bag</button>
</div>
</div>
<div class="description" v-if="book.hover">
<p class="hovered-heading">BookDetails</p>
{{book.description}}
</div>
</div>
</div>
</template>
<script>
import service from '../service/User'
export default {
mounted() {
service.userDisplayBooks().then(response => {
let data = response.data;
data.map(function(obj) {
obj.hover = false;
return obj;
});
this.books.push(...data);
return response;
})
},
data() {
return {
isActive:true,
result: 0,
authorPrefix: 'by',
pricePrefix: 'Rs.',
defaultStrikePrice: '(2000)',
buttonValue: 'Add to Bag',
buttonWishlist:'wishlist',
buttonAddedBag:'Added to Bag',
flag: true,
state: true,
addedBooks:[],
clickedCard: '',
books: [] // i want to display this array length
}
},
watch:{
addedBooks:{
handler(val){
this.$emit('update-books-count',val.length)
},
deep:true
}
},
methods: {
toggleClass: function(event){
this.isActive = !this.isActive;
return event;
},
toggle(id) {
this.clickedCard = id;
console.log(this.clickedCard);
},
flip() {
this.state = !this.state;
},
Togglebtn() {
this.flag = !this.flag;
},
handleCart(bookId){
let userData={
id: bookId,
}
service.userUpdateCart(userData).then(response=>{
return response;
}).catch(error=>{
alert("error while displaying Books");
return error;
})
},
removeFromCart(bookId){
let userData={
id:bookId,
}
service.userRemoveFromCart(userData).then(response=>{
return response;
}).catch(error=>{
alert("error while removing from cart");
return error;
})
}
}
}
</script>

exception "Symfony\\Component\\HttpKernel\\Exception\\NotFoundHttpException"

Using Vue(SPA) in Laravel-8
I am trying to use event and fetch some data from the component but the data is not being fetched and the error that I am getting is:- 404
exception "Symfony\Component\HttpKernel\Exception\NotFoundHttpException"
Here's the Contacts.vue that I am using to send DisplayMessages event request:-
<template>
<div class="container">
<div class="row justify-content-center">
<div class="col-md-8">
<div class="card">
<div class="card-header">Contacts List</div>
<div class="card-body">
<ul v-for="contact in contacts" :key="contact.id" >
<li>
<button #click="displayMesages(contact.id)">
{{contact.name}}
</button>
</li>
</ul>
</div>
</div>
</div>
</div>
</div>
</template>
<script>
export default {
data(){
return {
contacts: []
}
},
mounted() {
axios.get('/api/contacts-list')
.then(response => this.contacts = response.data)
},
methods: {
displayMesages(id){
console.log(id);
DisplayMessages.$emit('refresh', id);
}
}
}
</script>
Here's the DisplayMessages.vue where the request is being receieved:-
<template>
<div class="container">
<div class="row justify-content-center">
<div class="col-md-8">
<div class="card">
<div class="card-header">Display Messages</div>
<div class="card-body">
<h2 v-for="message in messages">{{message.message}}</h2>
</div>
</div>
</div>
</div>
</div>
</template>
<script>
// import contacts from './ContactsList.vue';
export default {
data() {
return {
contacts: [],
messages: []
}
},
mounted() {
DisplayMessages.$on('refresh', (id)=>{
axios.get('/api/display-message/'+ id).then(response => this.messages = response.data)
});
}
}
</script>
Here's the route DisplayMessages is fetching:-
Route::get('/api/display-messages/{id}', [App\Http\Controllers\ChatsController::class, 'displayMessages']);
Here's the Controller:-
public function displayMessages($id)
{
return Chats::all();
}

There is a typing mistake in DisplayMessages.vue in axios route:-
mounted() {
DisplayMessages.$on('refresh', (id)=>{
axios.get('/api/display-message/'+ id).then(response => this.messages = response.data) //It should be '/api/display-messages/`
});
}

Does this route actually exist and return something?
/api/contacts-list

Bind element inside a for loop Vue not working properly

In the following Vue Component I want to loop through dwarfs array. And as long as I am in the current component, everything is fine (TEST) and also all the following properties are correct.
Currenct_Component.vue :
<template>
<div>
<h2>Stamm: {{ tribeName }}</h2>
<div class="card-container">
<div class="card" style="width: 18rem;" v-for="dwarf in dwarfs" :key="dwarf.name">
<!-- TEST -->
<p>{{dwarf}}</p>
<!-- CHILD COMPONENT -->
<app-modal
:showModal="showModal"
:targetDwarf="dwarf"
#close="showModal = false"
#weaponAdded="notifyApp"
/>
<!-- <img class="card-img-top" src="" alt="Card image cap">-->
<div class="card-body">
<h3 class="card-title" ref="dwarfName">{{ dwarf.name }}</h3>
<hr>
<ul class="dwarf-details">
<li><strong>Alter:</strong> {{ dwarf.age }}</li>
<li><strong>Waffen:</strong>
<ul v-for="weapon in dwarf.weapons">
<li><span>Name: {{ weapon.name }} | Magischer Wert: {{ weapon.magicValue }}</span></li>
</ul>
</li>
<li><strong>Powerfactor:</strong> {{ dwarf.weapons.map(weapon => weapon.magicValue).reduce((accumulator, currentValue) => accumulator + currentValue) }}</li>
</ul>
<button class="card-button" #click="showModal = true"><span class="plus-sign">+</span> Waffe</button>
</div>
</div>
</div>
<button id="backBtn" #click="onClick">Zurück</button>
</div>
</template>
<script>
import Modal from './NewWeaponModal.vue';
export default {
data() {
return {
showModal: false,
}
},
components: { appModal : Modal },
props: ['tribeName', 'dwarfs'],
methods: {
onClick() {
this.$emit('backBtn')
},
notifyApp() {
this.showModal = false;
this.$emit('weaponAdded');
}
},
}
</script>
But when I bind the element dwarf to the Child Component <app-modal/> it changes to the next dwarf in the array dwarfs (TEST) - (So as the result when i add a new weapon in the modal-form it gets added to the second dwarf...):
Child_Component.vue :
<template>
<div>
<div class="myModal" v-show="showModal">
<div class="modal-content">
<span #click="$emit('close')" class="close">×</span>
<h3>Neue Waffe</h3>
<!-- TEST -->
<p>{{ targetDwarf }}</p>
<form>
<input
type="text"
placeholder="Name..."
v-model="weaponName"
required
/>
<input
type="number"
placeholder="Magischer Wert..."
v-model="magicValue"
required
/>
<button #click.prevent="onClick">bestätigen</button>
</form>
</div>
</div>
</div>
</template>
<script>
export default {
data() {
return {
weaponName: '',
magicValue: '',
}
},
props: ['showModal', 'targetDwarf'],
methods: {
onClick() {
if(this.weaponName !== '' &&
Number.isInteger(+this.magicValue)) {
let newData = {...this.dwarf};
newData['weapons'] = [
...this.dwarf['weapons'],
{
"name": this.weaponName,
"magicValue": Number.parseInt(this.magicValue)
},
];
this.$http.post("https://localhost:5019/api", newData)
.then(data => data.text())
.then(text => console.log(text))
.catch(err => console.log(err));
this.$emit('weaponAdded');
} else {
alert('You should fill all fields validly')
}
},
}
}
</script>

It looks like you have the <app-modal/> component inside of the v-for="dwarf in dwarfs" loop, but then the control for showing all of the modal components created by that loop is just in one variable: showModal. So when showModal is true, the modal will show each of the dwarfs, and I'm guessing the second dwarf's modal is just covering up the first one's.
To fix this, you could move the <app-modal /> outside of that v-for loop, so there's only one instance on the page, then as part of the logic that shows the modal, populate the props of the modal with the correct dwarf's info.
Something like this:
<div class="card-container">
<div class="card" v-for="dwarf in dwarfs" :key="dwarf.name">
<p>{{dwarf}}</p>
<div class="card-body">
<button
class="card-button"
#click="() => setModalDwarf(dwarf)"
>
Waffe
</button>
</div>
</div>
<!-- Move outside of v-for loop -->
<app-modal
:showModal="!!modalDwarfId"
:targetDwarf="modalDwarfId"
#close="modalDwarfId = null"
#weaponAdded="onDwarfWeaponAdd"
/>
</div>
export default {
//....
data: () => ({
modalDwarfId: null,
)},
methods: {
setModalDwarf(dwarf) {
this.modalDwarfId = drawf.id;
},
onDwarfWeaponAdd() {
//...
}
},
}
You could then grab the correct dwarf data within the modal, from the ID passed as a prop, or pass in more granular data to the modal so it's more "dumb", which is the better practice so that the component isn't dependent on a specific data structure. Hope that helps

Courtesy of #Joe Dalton's answer, a bit alternated for my case:
<div class="card" style="width: 18rem;" v-for="dwarf in dwarfs" :key="dwarf.name">
...
<button class="card-button" #click="setModalDwarf(dwarf)"><span class="plus-sign">+</span> Waffe</button>
<div>
<app-modal
:showModal="showModal"
:targetDwarf="currentDwarf"
#close="showModal = false"
#weaponAdded="notifyApp"
/>
<script>
import Modal from './NewWeaponModal.vue';
export default {
data() {
return {
showModal: false,
currentDwarf: null,
}
},
components: { appModal : Modal },
props: ['tribeName', 'dwarfs'],
methods: {
setModalDwarf(dwarf) {
this.currentDwarf = dwarf;
this.showModal = true;
},
...
}
</script>

VUE template problem to center text with text-center

I have problem to center h1 tag category.title with bootstrap property "text-center" in vue.js component, the title appears in left side. Everything else, for example category.description is centering correctly. It looks like only title refuses to be influenced by any align.
<template>
<div class="row" v-for="category in laravelData">
<h1 class="text-center">{{ category.title }}</h1>
<p class="text-center pb-3">{{ category.description }}</p>
<div class="col-sm-12 col-md-6 col-lg-6" v-for="project in category.project">
<div class="projects-thumb">
<img :src="/img/ + photo.filename" class="img-responsive" alt="" v-for="photo in project.photo">
<h3 class="pt-3">{{ project.title }}</h3>
<p class="mt-2 p-3">{{ project.description }}</p>
</div>
</div>
</div>
</template>
<script>
export default {
data() {
return {
category: {},
laravelData: {},
id: '',
succmsg: true,
showmodal: false,
actionmsg: '',
}
},
methods: {
projectList() {
var id = _.last( window.location.pathname.split( '/' ) );
axios.get('/api/category/'+ id).then((response) => {
this.laravelData = response.data;
});
}
},
mounted() {
this.projectList();
}
}
</script>
Maybe the problem is because of several loops in this template?

How to pass object data from parent to child components?

I would like to know how to make the contents object visible in the video.vue component.
This is the Video.vue components. This component is where I want to access the content object that is defined in the Home.vue component.
<template>
<div>
<h1>{{title}}</h1>
</div>
</template>
<script>
export default {
data() {
return {
title: 'Video Section'
}
}
}
</script>
This is the Home.vue component:
<template>
<div class="container">
<div class="column is-one-third" v-for="content in contents.results" :content="content" :key="content.id">
<div v-show="loaded" class="loader"></div>
<div class="card" >
<div class="card-image">
<figure class="image">
<img :src="imageUrl + content.backdrop_path" alt="Image">
</figure>
</div>
<div class="card-content">
<div class="media">
<div class="media-left">
<figure class="image is-25x25">
<img id="poster-image" :src="imageUrl + content.poster_path" alt="Image">
</figure>
</div>
<div class="media-content">
<p id="movie-title" class="title is-4 no-padding">{{content.original_title}}</p>
<p><span class="title is-6"><i class="fas fa-star">{{" " + content.vote_average}}</i></span></p>
<p class="subtitle is-6"><i class="fas fa-calendar-alt">{{" " + content.release_date}}</i></p>
</div>
</div>
<div class="content">
{{ content.overview }}
<div class="background-icon"><span class="icon-twitter"></span></div>
</div>
<div id="footer-card-icons">
<i class="fas fa-info-circle"></i>
</div>
</div>
</div>
</div>
</div>
</template>
<script>
export default{
data: () => ({
contents: [],
baseurl: 'https://api.themoviedb.org/3',
apikey: '16667866c29ba1bc29e687b4892b8d5c',
imageUrl: 'https://image.tmdb.org/t/p/w1280',
loaded: true,
}),
created: function(){
this.fetchData();
},
methods:{
fetchData: function(){
console.log('fetch data')
this.$http.get(this.baseurl + '/discover/movie?api_key=' +
this.apikey + '&sort_by=popularity.desc').then(response =>{
this.contents = response.body;
this.loaded = false;
});
}
}
}
</script>

As Emile’s commented, you should use props in order to be able to pass data from parent to child component.
In your Home.vue, add:
<videos :content=“contents”></videos>
But if your contents data type is Array:
<videos v-for=“content in contents” :key=“content.id” :content=“content”></videos>
Notice that if you use v-for to loop a component, you need to add key attribute also.
Finally, in your Video.vue, you need to define the props like below:
<template>
<div>
<p>{{ content.overview }}</p>
</div>
</template>
<script>
export default {
props: [‘content’],
data() {
return {
title: 'Video Section'
}
}
}
</script>
Remember, props are reactive. It will respond to any updates or changes in content.
UPDATE: It seems you have not properly declared your component. See codepen link. Better if you could declare any other components as Single File Components as explained here.