allowOverlap property for Highcharts JS v3.0.10 - highcharts

Question

In my project, we are using the highchart version: Highcharts JS v3.0.10.
What should be equivalent code or property which is suitable for allowOverlap = false according to the newer version?
How to achieve alloOverlap= false in the older version?
Link: https://api.highcharts.com/highcharts/series.timeline.dataLabels.allowOverlap

Answer 1

The code that is responsible for hiding the overlapping data labels is currently in Highcharts core: https://code.highcharts.com/highcharts.src.js, but previously it was a separate module: https://code.highcharts.com/5/modules/overlapping-datalabels.src.js
However, to make it work you would have to make many changes in your code. I think using the plugin below will be the best solution for you:
(function(H) {
var each = H.each,
extend = H.extend;
/**
* Hide overlapping labels. Labels are moved and faded in and out on zoom to provide a smooth
* visual imression.
*/
H.Series.prototype.hideOverlappingDataLabels = function() {
var points = this.points,
len = points.length,
i,
j,
label1,
label2,
intersectRect = function(pos1, pos2, size1, size2) {
return !(
pos2.x > pos1.x + size1.width ||
pos2.x + size2.width < pos1.x ||
pos2.y > pos1.y + size1.height ||
pos2.y + size2.height < pos1.y
);
};
// Mark with initial opacity
each(points, function(point, label) {
label = point.dataLabel;
if (label) {
label.oldOpacity = label.opacity;
label.newOpacity = 1;
}
});
// Detect overlapping labels
for (i = 0; i < len - 1; ++i) {
label1 = points[i].dataLabel;
for (j = i + 1; j < len; ++j) {
label2 = points[j].dataLabel;
if (label1 && label2 && label1.newOpacity !== 0 && label2.newOpacity !== 0 &&
intersectRect(label1.alignAttr, label2.alignAttr, label1, label2)) {
(points[i].labelrank < points[j].labelrank ? label1 : label2).newOpacity = 0;
}
}
}
// Hide or show
each(points, function(point, label) {
label = point.dataLabel;
if (label) {
if (label.oldOpacity !== label.newOpacity) {
label[label.isOld ? 'animate' : 'attr'](extend({
opacity: label.newOpacity
}, label.alignAttr));
}
label.isOld = true;
}
});
};
H.wrap(H.Series.prototype, 'drawDataLabels', function(proceed) {
proceed.call(this);
this.hideOverlappingDataLabels();
});
}(Highcharts));
Live demo: http://jsfiddle.net/BlackLabel/6s5ycrwa/