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Automatically aborts adding additional markers for an ongoing addLayers call when the clearLayers function is called. #816

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14 changes: 13 additions & 1 deletion src/MarkerClusterGroup.js
Original file line number Diff line number Diff line change
Expand Up @@ -75,6 +75,8 @@ L.MarkerClusterGroup = L.FeatureGroup.extend({
L.extend(this, animate ? this._withAnimation : this._noAnimation);
// Remember which MarkerCluster class to instantiate (animated or not).
this._markerCluster = animate ? L.MarkerCluster : L.MarkerClusterNonAnimated;
//Set the initial clear layers count to 0
this._clearLayersCallCount = 0;
},

addLayer: function (layer) {
Expand Down Expand Up @@ -199,13 +201,17 @@ L.MarkerClusterGroup = L.FeatureGroup.extend({
l = layersArray.length,
offset = 0,
originalArray = true,
m;
m,
clearLayerIndexWhenStarted = this._clearLayersCallCount;

if (this._map) {
var started = (new Date()).getTime();
var process = L.bind(function () {
var start = (new Date()).getTime();
for (; offset < l; offset++) {
if (clearLayerIndexWhenStarted !== this._clearLayersCallCount) {
break;
}
if (chunked && offset % 200 === 0) {
// every couple hundred markers, instrument the time elapsed since processing started:
var elapsed = (new Date()).getTime() - start;
Expand Down Expand Up @@ -260,6 +266,10 @@ L.MarkerClusterGroup = L.FeatureGroup.extend({
}
}

if (clearLayerIndexWhenStarted !== this._clearLayersCallCount) {
return;
}

if (chunkProgress) {
// report progress and time elapsed:
chunkProgress(offset, l, (new Date()).getTime() - started);
Expand Down Expand Up @@ -419,6 +429,8 @@ L.MarkerClusterGroup = L.FeatureGroup.extend({
delete this._gridUnclustered;
}

++this._clearLayersCallCount;

if (this._noanimationUnspiderfy) {
this._noanimationUnspiderfy();
}
Expand Down