Highchart - Pie chart negative value when downloadXLS & viewData - highcharts

Question

i try to make negative value show in pie chart , and it success but when i use exporting 'downloadXLS' and 'viewData' the value its always show possitive, i know when use pie chart the data value must be possitive, but there is any method when export to 'downloadXLS' and 'viewData' can edit value data to negative ?
this is jsfiddle when i try to make the chart https://jsfiddle.net/zhpnos50/3/
Highcharts.chart('container', {
chart: {
type: 'pie',
},
title: {
text: 'Chart'
},
credits: {
enabled: false
},
tooltip: {
pointFormatter: function () {
if (this.y === null) {
return this.name + ': 0%';
} else {
return this.name + ': ' + (this.negative ? '-'+ this.y : this.y) + '%';
}
},
useHTML: true
},
legend: {
itemStyle: {
fontSize: '11px',
},
backgroundColor: (Highcharts.theme && Highcharts.theme.legendBackgroundColor) || 'rgba(255,255,255,0.25)',
labelFormatter: function () {
if (this.y === null) {
return this.name + ': 0%';
} else {
return this.name + ': ' + (this.negative ? '-'+ this.y : this.y) + '%';
}
},
},
plotOptions: {
pie: {
allowPointSelect: true,
cursor: 'pointer',
showInLegend: true,
dataLabels: {
formatter() {
let neg = this.point.negative,
value = this.point.negative ? -this.y : this.y,
negativeColor = Highcharts.defaultOptions.colors[0];
return '<b>'+this.point.name+'</b>: '+value+' %'
}
}
},
series: {
cursor: 'pointer',
}
},
series: [{
name: 'Value',
data: [{
name: 'A',
y: 106.733600
}, {
name: 'B',
y: 0.725800
}, {
name: 'C',
y: 0.000000
}, {
name: 'D',
y: 7.530000,
negative: true
}, {
name: 'E',
y: 0.070500
}]
}],
exporting: {
sourceHeight: 800,
sourceWidth: 800,
scale: 1,
buttons: {
contextButton: {
menuItems: ['printChart', 'downloadPNG', 'downloadJPEG', 'downloadPDF', 'downloadXLS','viewData']
}
}
}
});
<script src="https://github.highcharts.com/gantt/highcharts-gantt.src.js"></script>
<script src="https://code.highcharts.com/modules/exporting.js"></script>
<script src="https://code.highcharts.com/modules/export-data.js"></script>
<div id="container"></div>

Answer 1

You can add the below plugin to modify exported values:
(function(H) {
H.addEvent(H.Chart, 'exportData', function(e) {
const dataRows = e.dataRows;
this.series[0].points.forEach(point => {
if (point.options.negative) {
// +2 to skip title rows
dataRows[point.index + 2][1] = -point.y;
}
});
});
}(Highcharts));
Live demo: https://jsfiddle.net/BlackLabel/ert78shL/
Docs: https://api.highcharts.com/highcharts/exporting.csv