Hide/Show the corresponding data from the chart on legend click ngx-charts - ngx-charts

Question

I am working with angular 6 and ngx-chart and I need on clicking the legend item, the corresponding data from the chart should show/hide
The ng-chart library does have this functionality and my client requests it.
Edit01:
I have almost everything working but I have a problem when applying axisFormat. once I remove an item from the legend it reformats the x-axis and doesn't literally put how the data comes without applying the AxisFormat. Any solution?
onSelect (event) {
let temp = JSON.parse(JSON.stringify(this.multi));
this.sourceData = JSON.parse(JSON.stringify(this.multi2));
if (this.isDataShown(event)) {
//Hide it
temp.some(pie => {
const pie2 = pie.name[0] + ',' + pie.name[1];
// console.log('pie', pie[0], event, pie2);
if (pie2 === event) {
pie.series = [];
return true;
}
});
} else {
//Show it back
console.log('Entramos en el ELSE');
const pieToAdd = this.sourceData.filter(pie => {
const pie2 = pie.name[0] + ',' + pie.name[1];
return pie2 === event;
});
temp.some(pie => {
const pie2 = pie.name[0] + ',' + pie.name[1];
if (pie2 === event) {
pie.series = pieToAdd[0].series;
return true;
}
});
}
console.log('log temp: ' + JSON.stringify(temp));
this.multi = temp;
// this.axisFormat(this.multi);
}
isDataShown = (name) => {
const selectedPie = this.multi.filter(pie => {
const pie2 = pie.name[0] + ',' + pie.name[1];
return pie2 === name && pie.series[0] !== undefined;
});
return selectedPie && selectedPie.length > 0;
}
axisFormat(val) {
const options = { day: 'numeric', month: 'short', hour: '2-digit', minute: '2-digit' };
// Esto funciona pero al hacer timeline no pone horas val.toLocaleDateString("es-ES", options);
console.log('val:', val.toLocaleDateString('es-ES', options));
return val.toLocaleDateString('es-ES', options);
}
HTML
<ngx-charts-line-chart [view]="" [scheme]="colorScheme" [results]="multi" [gradient]="gradient" [xAxis]="showXAxis" [yAxis]="showYAxis" [legend]="showLegend" legendPosition="'below'" [showXAxisLabel]="showXAxisLabel" [showYAxisLabel]="showYAxisLabel"
[xAxisLabel]="xAxisLabel" [yAxisLabel]="yAxisLabel" [autoScale]="autoScale" [timeline]="timeline" [roundDomains]="true" [animations]="animations" (select)="onSelect($event)" [xAxisTickFormatting]="axisFormat">
<ng-template #seriesTooltipTemplate let-items="model">
<p>{{items[0].name | date:'medium'}}</p>
<ul>
<li *ngFor="let item of items">
{{item.series}}: {{item.value | number}}
</li>
</ul>
</ng-template>
</ngx-charts-line-chart>
EDIT
Hello,
I have already managed to solve the problem adding an example in case it can help other people.
https://stackblitz.com/edit/click-lengd-ngx-charts

Answer 1

I am kinda new to Stack Overflow, but i think you should specify your answer more and show us what you already tried. Nevertheless I will try to help you.
You should give your chart a (select)="onClickFunction ($event)" in HTML. In your TS you then call the onClickFunction(event). I always start with giving it a console.log(event) to see what i get from clicking on the legend.
After clicking on the legend, you get the label of the element you clicked on. You can then search for this label in your data and remove this data out of the array you use for filling the chart.
If you provide a stackblitz or plunker wtih your code, I will gladly show you how to do it.

Answer 2

This is how we can achieve it for ngx-pie-chart. With the help of select event, capture it, identify the item from the data and make it zero. Next, on the next click, add the value back from the source copy. See it working here ngx-pie-chart label-filter
onSelect (event) {
let temp = JSON.parse(JSON.stringify(this.single));
if (this.isDataShown(event)) {
//Hide it
temp.some(pie => {
if (pie.name === event) {
pie.value = 0;
return true;
}
});
} else {
//Show it back
const pieToAdd = this.sourceData.filter(pie => {
return pie.name === event;
});
temp.some(pie => {
if (pie.name === event) {
pie.value = pieToAdd[0].value;
return true;
}
});
}
this.single = temp;
}
isDataShown = (name) => {
const selectedPie = this.single.filter(pie => {
return pie.name === name && pie.value !== 0;
});
return selectedPie && selectedPie.length > 0;
}