Axios response happening after component is rendered - vue.js

Question

I have a parent component making an Ajax request using Axios, The response is then assigned to a variabled called 'carousel' and is then passed down to the child component.
In the child component on 'created()' I am assigning the passed prop 'carousel' to a new variable called 'slides'
Problem is when I do this is returns undefined and my thinking is the Axios query hasn't returned before this happens.
Is there a way to delay the axios request before the prop is passed and the child component always gets the expected response.
My code is below.
Parent
<template>
<div class='product-container'>
<home-carousel :carousel="carousel"></home-carousel>
<profiler></profiler>
<cta-sections :panels="panels"></cta-sections>
</div>
</template>
<script>
import api from '../api/Home'
import CtaSections from '../components/CtaSections'
import HomeCarousel from '../components/HomeCarousel'
import Profiler from '../components/Profiler'
export default {
components: {
CtaSections,
HomeCarousel,
Profiler,
},
data() {
return {
panels: [],
slides: 'test',
carouselPass: [],
carousel: [],
}
},
created() {
axios.get(window.SETTINGS.API_BASE_PATH + 'pages/5')
.then(response => {
this.panels = response.data.acf.split_panels;
this.carousel = response.data.acf.carousel;
this.carousel.forEach(function (item, index) {
if (index === 0) {
item.active = true;
item.opacity = 1;
} else {
item.active = false;
item.opacity = 0;
}
item.id = index
})
})
},
}
</script>
Child
<template>
<div class='slider'>
<transition-group class='carouse carousel--fullHeight carousel--gradient' tag="div" name="fade">
<div v-for="slide in slides"
class="carousel__slide"
v-bind:class="{ active: slide.active }"
:key="slide.id"
:style="{ 'background-image': 'url(' + slide.image.url + ')' }"
v-show="slide.active"
>
<div class="carousel__caption carousel__caption--centered">
<h2 class="heading heading--white heading--uppercase heading--fixed">{{ slide.tagline }}</h2>
</div>
</div>
</transition-group>
<div class='carousel__controls carousel__controls--numbered carousel__controls--white carousel__controls--bottomRight carousel__controls--flex'>
<div #click="next" class="in">
<img src="/static/img/svg/next-arrow.svg" />
<span v-if="carousel.length < 10">0</span>
<span>{{ slideCount }}</span>
<span>/</span>
<span v-if="carousel.length < 10">0</span>
<span>{{ carousel.length }}</span>
</div>
</div>
</div>
</template>
<script>
import bus from '../bus'
import Booking from './Booking'
export default {
name: 'HomeCarousel',
props: ['carousel'],
data() {
return {
slideCount: 1,
slides: [],
/*
slides: [{
image: this.themepath + 'home-banner.jpg',
active: true,
captionText: 'A PLACE AS UNIQUE AS YOU ARE',
buttonText: 'book now',
buttonUrl: '#',
opacity: 1,
id: 1
},
{
image: this.themepath + 'home-banner2.jpg',
active: false,
captionText: 'A PLACE AS UNIQUE AS YOU ARE',
buttonText: 'book now',
buttonUrl: '#',
opacity: 0,
id: 2
}
]
*/
}
},
methods: {
showBooking: function() {
this.$store.state.showBooking = true;
},
next() {
const first = this.slides.shift();
this.slides = this.slides.concat(first)
first.active = false;
this.slides[0].active = true;
if (this.slideCount === this.slides.length) {
this.slideCount = 1;
} else {
this.slideCount++;
}
},
previous() {
const last = this.slides.pop()
this.slides = [last].concat(this.slides)
// Loop through Array and set all active values to false;
var slideLength = this.slides.length;
for (var slide = 0; slide < slideLength; slide++) {
this.slides[slide].active = false;
}
// Apply active class to first slide
this.slides[0].active = true;
this.slideCount--;
},
loopInterval() {
let self = this;
setInterval(function () {
self.next()
}, 8000);
}
},
created() {
this.slides = this.carousel;
}
}
</script>

Answer 1

You can just watch the prop and set this.slides when it changes, i.e. when the async call has finished:
watch:{
carousel(value) {
this.slides = value
}
}
Here's a JSFiddle: https://jsfiddle.net/nwLh0d4w/