VueJS // HTML render after API response - vue.js

Question

I render html with some data received from server. It's almost fine but I see errors to console while I didn't receive data from server yet.
Here is the code:
<div class="wiget__eventDetails">
<p class="wiget__eventName">{{ show[0] == 'undefined' ? '' : show[0].title }}</p>
<div class="wiget__place">
<span class="wiget__venue">{{ building[0] == 'undefined' ? '' : building[0].title }}, </span>
<span class="wiget__venueHall">{{ hall[0] == 'undefined' ? '' : hall[0].title }}</span>
</div>
<div class="wiget__dateOfEvent">
<span class="wiget__time">{{this.getTime(this.event[0].date)}}</span>
<span class="wiget__date">{{this.getDate(this.event[0].date)}}</span>
</div>
</div>
So while show[0] === 'undefined' I receive an error to console (Error in render: "TypeError: Cannot read property 'title' of undefined") but the page renders and the statement above do not help
Here is full code of the template
<template>
<div class="allPlaces" id="allPlaces">
<div class="wiget__row wiget__row--top wiget__row--top--allPlaces" id="topRow">
<div class="wiget__details wiget__details--allPlaces">
<div class="wiget__logo">
<img class="wiget__img wiget__img--logo" width="28" height="30" src="../../img/kassy_logo_img.png" alt="">
<img class="wiget__img wiget__img--logoTXT" width="59" height="28" src="../../img/kassy_logo_text.png" alt="">
</div>
<div class="wiget__eventDetails">
<p class="wiget__eventName">{{ show[0] == 'undefined' ? '' : show[0].title }}</p>
<div class="wiget__place">
<span class="wiget__venue">{{ building[0] == 'undefined' ? '' : building[0].title }}, </span>
<span class="wiget__venueHall">{{ hall[0] == 'undefined' ? '' : hall[0].title }}</span>
</div>
<div class="wiget__dateOfEvent">
<span class="wiget__time">{{this.getTime(this.event[0].date)}}</span>
<span class="wiget__date">{{this.getDate(this.event[0].date)}}</span>
</div>
</div>
</div>
</div>
<div class="allPlaces__wrapper">
<h1 class="allPlaces__title">Оформление заказа</h1>
<p class="allPlaces__description">Для оформления заказа выберите нужное количество мест</p>
<div class="allPlaces__content">
<div class="allPlaces__entrance" v-for="(entrance, index) in places.entrance">
<div class="allPlaces__infoBlock">
<div>
<div class="allPlaces__available">
<span class="allPlaces__label allPlaces__label--places">Доступно мест:</span>
<span class="allPlaces__data">&nbsp{{entrance.vacant_places}}</span>
</div>
<div class="allPlaces__title allPlaces__title--entrance">{{getEntranceName(entrance)}}</div>
</div>
<div class="allPlaces__price">
<span class="allPlaces__label">Цена: </span>
<span class="allPlaces__data">{{entrance.price}}</span>
</div>
</div>
<div class="allPlaces__orderBlock">
<div class="allPlaces__inputBlock">
<input class="allPlaces__input" type="number" name="amount"
v-model="entrance.value" #blur="showLabel($event, index)">
<label class="allPlaces__label allPlaces__label--input"
#click="hideLabel($event, index)">Количество мест
</label>
</div>
<div class="allPlaces__btnBlock">
<button class="allPlaces__btn allPlaces__btn--minus" type="button" name="button"
#click="removeTicket(entrance, index)"></button>
<button class="allPlaces__btn allPlaces__btn--plus" type="button" name="button"
#click="addTicket(entrance, index)">
</button>
</div>
<button class="allPlaces__btn allPlaces__btn--confirm" type="button" name="button"
#click="addEntrancePlaceToCart(entrance, index)">
<img class="allPlaces__img allPlaces__img--cart" src="../../img/cartWhite.png" alt="Корзина">
<span class="allPlaces__text allPlaces__text--cart">В корзину</span>
</button>
</div>
</div>
</div>
</div>
<div class="wiget__row wiget__row--bottom" id="bottomRow">
<div class="wiget__row">
<div class="wiget__amountBlock">
<span class="wiget__tickets">
<span>Билеты:</span>
<span class="wiget__amount wiget__amount--tickets">{{this.ticketsInCart.count}}</span>
<span>шт.</span>
</span>
<div class="wiget__money">
<span class="wiget__money wiget__money--label">Итого:</span>
<p>
<span class="wiget__amount wiget__amount--money">{{this.ticketsInCart.total}}&nbsp</span>
<span class="wiget__amount wiget__amount--money">руб.</span>
</p>
</div>
</div>
<div class="wiget__btnBlock">
<button class="wiget__btn wiget__btn--goToHall" type="button" name="button"
#click="goToHall()">
Выбрать на схеме
</button>
<button class="wiget__btn wiget__btn--confirm" type="button" name="button"
#click="goToCartPage($event)">Оформить заказ</button>
</div>
</div>
<div class="wiget__row wiget__row--service">
<span class="wiget__service">Сервис предоставлен:</span>
Kassy.ru
</div>
</div>
</div>
</template>
<script>
import vueMethods from '../../mixins/methods'
import { mapState } from 'vuex'
export default {
name: 'allPlaces',
mixins: [vueMethods],
data () {
return {
showTitle: ''
}
},
mounted () {
this.$nextTick(function () {
window.addEventListener('resize', this.updateAllPlacesOnResize)
this.setupAllPlaces()
})
},
methods: {
setupAllPlaces () {
let allPlaces = document.getElementById('allPlaces')
let topRow = document.querySelector('.wiget__row--top')
let wrapper = document.querySelector('.allPlaces__wrapper')
let bottomRow = document.querySelector('.wiget__row--bottom')
let allPlacesHeight = allPlaces.clientHeight
let topRowHeight = topRow.clientHeight
let bottomRowHeight = bottomRow.clientHeight
let wrapperHeight = allPlacesHeight - topRowHeight - bottomRowHeight
console.log('topRowHeight ', topRowHeight)
console.log('allPlacesHeight ', allPlacesHeight)
console.log('bottomRowHeight ', bottomRowHeight)
console.log('wrapperHeight ', wrapperHeight)
wrapper.style.minHeight = wrapperHeight + 'px'
},
updateAllPlacesOnResize (event) {
this.setupAllPlaces()
},
getEntranceName (entrance) {
let sectionId = entrance.section_id
let section = this.section
let sectionName = section.filter(function (e) {
return e.id === sectionId
})
return sectionName[0].title
},
updateEntranceTicketsAmount (index, value) {
console.log(index)
console.log(this.$store.state.onload.eventData.places.entrance)
let label = document.getElementsByClassName('allPlaces__label allPlaces__label--input')
let input = document.getElementsByClassName('allPlaces__input')
input[index].focus()
console.log(label)
// label[index].style.display = 'none'
this.$store.state.onload.eventData.places.entrance[index].value = value
},
addTicket (tickets, index) {
let value = tickets.value
if (value === '') {
value = 1
} else if (value <= 100) {
value = parseInt(value) + 1
} else {
value = parseInt(value)
}
console.log('tickets ', tickets)
console.log('index ', index)
this.updateEntranceTicketsAmount(index, value)
},
removeTicket (tickets, index) {
let value = tickets.value
console.log('value ', value)
if (value === '') {
value = 0
} else if (value <= 100 && value > 0) {
value = parseInt(value) - 1
} else {
value = parseInt(value)
}
this.updateEntranceTicketsAmount(index, value)
},
addEntrancePlaceToCart (entrance) {
console.log('entrance.id to add to cart ', entrance.id)
let db = this.db
let places = parseInt(entrance.value)
console.log('places ', places)
let sessionId = this.sessionId
let entranceId = parseInt(entrance.id)
let params = {db, places, sessionId, entranceId}
this.$store.dispatch('addEntrancePlaceToCart', params) // Добавили место в корзину
},
goToHall () {
this.$store.dispatch('closeAllPlaces')
this.$store.dispatch('openHallPlan')
},
hideLabel (e, index) {
console.log('CLICKED')
console.log('index click', index)
let input = document.getElementsByClassName('allPlaces__input')
input[index].focus()
},
showLabel (e, index) {
console.log(e)
let target = e.target
console.log('BLUR')
console.log('target', target)
let label = document.getElementsByClassName('allPlaces__label allPlaces__label--input')
console.log('target.value ', target.value)
if (target.value === '' || target.value === undefined) {
label[index].style.display = 'block'
} else {
label[index].style.display = 'none'
}
}
},
destroyed () {
window.removeEventListener('resize', this.setupAllPlaces)
},
computed: {
...mapState({
db: state => state.onload.currentDb,
currentEvent: state => state.onload.currentEvent,
modals: state => state.modals,
metric: state => state.onload.eventData.metric,
section: state => state.onload.eventData.section,
show: state => state.onload.eventData.show,
event: state => state.onload.eventData.event,
building: state => state.onload.eventData.building,
hall: state => state.onload.eventData.hall,
places: state => state.onload.eventData.places,
placesSeated: state => state.onload.eventData.places.place,
sessionId: state => state.cart.sessionId,
ticketsInCart: state => state.cart.ticketsInCart
})
}
}
</script>
<style scoped lang="stylus">
#import '../../styles/Root/allPlaces'
#import '../../styles/Root/wiget'
</style>