Can't pass my data to the mounted() method - vue.js

Question

I am fairly new to Vue so excuse my stupidity!!
Can anyone tell me what I am doing wrong in my code below that is preventing me from getting my 'series_interactions_daily' variable data from inside the mounted() method please? I am console.log()'ing it but nothing shows! I can print 'series_interactions_daily' to screen in the HTML though!
<script>
import * as am4core from "#amcharts/amcharts4/core";
import * as am4charts from "#amcharts/amcharts4/charts";
import am4themes_animated from "#amcharts/amcharts4/themes/animated";
am4core.useTheme(am4themes_animated);
export default {
mounted() {
let chart = am4core.create(this.$refs.chartdiv, am4charts.XYChart);
chart.paddingRight = 20;
let dummydata = [];
let visits = 10;
for (let i = 1; i < 366; i++) {
visits += Math.round((Math.random() < 0.5 ? 1 : -1) * Math.random() * 10);
dummydata.push({ date: new Date(2018, 0, i), name: "name" + i, value: visits });
}
chart.data = dummydata;
console.log(this.series_interactions_daily);
let dateAxis = chart.xAxes.push(new am4charts.DateAxis());
dateAxis.renderer.grid.template.location = 0;
let valueAxis = chart.yAxes.push(new am4charts.ValueAxis());
valueAxis.tooltip.disabled = true;
valueAxis.renderer.minWidth = 35;
let series = chart.series.push(new am4charts.LineSeries());
series.dataFields.dateX = "date";
series.dataFields.valueY = "value";
series.tooltipText = "{valueY.value}";
chart.cursor = new am4charts.XYCursor();
let scrollbarX = new am4charts.XYChartScrollbar();
scrollbarX.series.push(series);
chart.scrollbarX = scrollbarX;
this.chart = chart;
},
beforeDestroy() {
if (this.chart) {
this.chart.dispose();
}
},
data() {
return {
campaign_id: this.$route.params.campaign_id,
campaign: [],
dateranges: [],
total_interactions: '',
average_daily_interactions: '',
series_interactions_daily: [],
}
},
methods: {
onChange(event) {
this.$router.push('?range=' + event.target.value);
this.$http.get('https://dev.local/api/portal/campaign/' + this.campaign_id + '?range=' + event.target.value)
.then(function(data){
return data.json();
}).then(function(data){
this.campaign = data.campaign;
this.dateranges = data.dateranges;
this.total_interactions = data.totalInteractions;
this.average_daily_interactions = data.averagreDailyInteractions;
this.series_interactions_daily = data.interactions_per_day.stats.interaction.daily;
});
}
},
created() {
this.$http.get('https://dev.local/api/portal/campaign/' + this.campaign_id + '?' + this.axiosParams)
.then(function(data){
return data.json();
}).then(function(data){
this.campaign = data.campaign;
this.dateranges = data.dateranges;
this.total_interactions = data.totalInteractions;
this.average_daily_interactions = data.averagreDailyInteractions;
this.series_interactions_daily = data.interactions_per_day.stats.interaction.daily;
});
},
computed: {
axiosParams() {
const params = new URLSearchParams();
if(this.$route.query.range) params.append('range', this.$route.query.range);
return params;
}
},
filters: {
},
directives: {
},
}
</script>
EDIT
OK, so I have create a method to fetchData() from mounted(){} - however I am still not getting my 'series_interactions_daily' variable data!
<script>
import * as am4core from "#amcharts/amcharts4/core";
import * as am4charts from "#amcharts/amcharts4/charts";
import am4themes_animated from "#amcharts/amcharts4/themes/animated";
am4core.useTheme(am4themes_animated);
export default {
mounted() {
this.fetchData();
let chart = am4core.create(this.$refs.chartdiv, am4charts.XYChart);
chart.paddingRight = 20;
let dummydata = [];
let visits = 10;
for (let i = 1; i < 366; i++) {
visits += Math.round((Math.random() < 0.5 ? 1 : -1) * Math.random() * 10);
dummydata.push({ date: new Date(2018, 0, i), name: "name" + i, value: visits });
}
chart.data = dummydata;
console.log(this.series_interactions_daily);
let dateAxis = chart.xAxes.push(new am4charts.DateAxis());
dateAxis.renderer.grid.template.location = 0;
let valueAxis = chart.yAxes.push(new am4charts.ValueAxis());
valueAxis.tooltip.disabled = true;
valueAxis.renderer.minWidth = 35;
let series = chart.series.push(new am4charts.LineSeries());
series.dataFields.dateX = "date";
series.dataFields.valueY = "value";
series.tooltipText = "{valueY.value}";
chart.cursor = new am4charts.XYCursor();
let scrollbarX = new am4charts.XYChartScrollbar();
scrollbarX.series.push(series);
chart.scrollbarX = scrollbarX;
this.chart = chart;
},
beforeDestroy() {
if (this.chart) {
this.chart.dispose();
}
},
data() {
return {
campaign_id: this.$route.params.campaign_id,
campaign: [],
dateranges: [],
total_interactions: '',
average_daily_interactions: '',
series_interactions_daily: [],
}
},
methods: {
fetchData() {
this.$http.get('https://dev.local/api/portal/campaign/' + this.campaign_id + '?' + this.axiosParams)
.then(function(data){
return data.json();
}).then(function(data){
this.campaign = data.campaign;
this.dateranges = data.dateranges;
this.total_interactions = data.totalInteractions;
this.average_daily_interactions = data.averagreDailyInteractions;
this.series_interactions_daily = data.interactions_per_day.stats.interaction.daily;
});
},
onChange(event) {
this.$router.push('?range=' + event.target.value);
this.$http.get('https://connie.laravel/api/portal/campaign/' + this.campaign_id + '?range=' + event.target.value)
.then(function(data){
return data.json();
}).then(function(data){
this.campaign = data.campaign;
this.dateranges = data.dateranges;
this.total_interactions = data.totalInteractions;
this.average_daily_interactions = data.averagreDailyInteractions;
this.series_interactions_daily = data.interactions_per_day.stats.interaction.daily;
});
}
},
created() {
},
computed: {
axiosParams() {
const params = new URLSearchParams();
if(this.$route.query.range) params.append('range', this.$route.query.range);
return params;
}
},
filters: {
},
directives: {
},
}
</script>
Any help appreciated.
Thanks,
K...

Answer 1

In fetchData, return the promise returned by the async $http call:
fetchData() {
return this.$http.get(...)
...
}
Now you can register a callback on that promise in mounted:
mounted() {
this.fetchData().then(result => {
...
});
}
Or just await it with async/await:
async mounted() {
await this.fetchData();
...
// Now everything will be ready
}
As #tao mentioned in comments, note that the await would delay any code that comes after it. If you don't have anything else to do in the hook anyway that's no problem but it's something to understand.