Initialization of variables with Vuex - vue.js

Question

I made a VueJS 3 project with VueX to store the data.
When I print the variable data.doughnutChart.data in the following code it displays
{ "labels": [ "OK", "WARNING", "ERROR" ], "datasets": [ {
"backgroundColor": [ "#d4efdf", "#fdebd0", "#fadbd8" ], "data": [ 3,
1, 2 ] } ] }
But the graph doesn't use these data [3,1,2], the graph uses the values of the initialization in the index.js of VueX.
Here my code :
<template>
{{data.doughnutChart.data}}
<div style="height:200px;width: 200px; position:center">
<vue3-chart-js
:id="data.doughnutChart.id"
:type="data.doughnutChart.type"
:data="data.doughnutChart.data"
:options="data.doughnutChart.options"
></vue3-chart-js>
</div>
</template>
<script>
import Vue3ChartJs from '#j-t-mcc/vue3-chartjs'
export default {
name: 'App',
components: {
Vue3ChartJs,
},
beforeMount() {
this.$store.dispatch("getData");
},
computed: {
data() {
return {
doughnutChart: {
id: 'doughnut',
type: 'doughnut',
data: {
labels: ['OK', 'WARNING', 'ERROR'],
datasets: [
{
backgroundColor: [
'#d4efdf',
'#fdebd0',
'#fadbd8'
],
data: [this.$store.state.nbOk, this.$store.state.nbWarning, this.$store.state.nbError]
}
]
},
options:
{
plugins: {
legend: {
display: false
},
title: {
display: true,
text: 'Current situation'
}
},
}
}
}
}
}
}
</script>
I read the value in my index.js (VueX) :
import axios from 'axios'
import { createStore } from 'vuex'
export default createStore({
state: {
data: [],
nbError : 0,
nbWarning : 0,
},
actions: {
getData({commit}){
axios.get('http://localhost:8080/data/mock.json')
.then(res => {
commit('SET_DATA', res.data)
})}
},
mutations: {
SET_DATA(state, data){
state.data = data.data;
state.nbWarning = 0;
state.nbError = 0;
for (let i = 0; i < state.data.length; i++) {
if(state.data[i].status == 'WARNING'){
state.nbWarning += 1;
};
if(state.data[i].status == 'ERROR'){
state.nbError += 1;
};
};
}
})
However it works when, in my Vuejs project, I go in an other page and come back but not when I just open the project or refresh the page.
Do you know why ?

Answer 1

data property should be defined as computed in order to receive store changes:
<template>
{{data}}
</template>
<script>
export default {
data() {
return {
}
},
computed:{
data(){
return [this.$store.state.nbWarning, this.$store.state.nbError]
}
},
beforeMount() {
this.$store.dispatch("getData");
}
}
</script>