调用百度地图API添加点聚合时，marker标注的label标签刷新丢失问题

最近在使用百度地图API的点聚合时遇到一个问题

当将自定义的Marker（含有Label）通过MarkerClusterer 管理的时候，当地图发生任何移动、缩放 的时候，Marker 的Label 就会自动消失。

这个问题主要是由于百度的点聚合API

的bug造成的。其实诱发这个问题的原因是在于API代码中的map.removeOverlay(marker)，在这句话执行的时候，会自动将marker.label =null；

我们可以在Clusterer 处理的所有地方都先读出来Label，等remove完毕之后再将这个Maker.setLabel 过去就ok了

tmplabel = this._markers[i].getLabel();

this._markers[i].getMap() && this._map.removeOverlay(this._markers[i]);

this._markers[i].setLabel(tmplabel);

在点聚合的页面中将

http://api.map.baidu.com/library/MarkerClusterer/1.2/src/MarkerClusterer_min.js替换为下面的MakerClusterer.js即可

修改过的MakerClusterer.js代码：

  1 var BMapLib = window.BMapLib = BMapLib || {}; (function() {
  2     var getExtendedBounds = function(map, bounds, gridSize) {
  3         bounds = cutBoundsInRange(bounds);
  4         var pixelNE = map.pointToPixel(bounds.getNorthEast());
  5         var pixelSW = map.pointToPixel(bounds.getSouthWest());
  6         pixelNE.x += gridSize;
  7         pixelNE.y -= gridSize;
  8         pixelSW.x -= gridSize;
  9         pixelSW.y += gridSize;
 10         var newNE = map.pixelToPoint(pixelNE);
 11         var newSW = map.pixelToPoint(pixelSW);
 12         return new BMap.Bounds(newSW, newNE)
 13     };
 14     var cutBoundsInRange = function(bounds) {
 15         var maxX = getRange(bounds.getNorthEast().lng, -180, 180);
 16         var minX = getRange(bounds.getSouthWest().lng, -180, 180);
 17         var maxY = getRange(bounds.getNorthEast().lat, -74, 74);
 18         var minY = getRange(bounds.getSouthWest().lat, -74, 74);
 19         return new BMap.Bounds(new BMap.Point(minX, minY), new BMap.Point(maxX, maxY))
 20     };
 21     var getRange = function(i, mix, max) {
 22         mix && (i = Math.max(i, mix));
 23         max && (i = Math.min(i, max));
 24         return i
 25     };
 26     var isArray = function(source) {
 27         return '[object Array]' === Object.prototype.toString.call(source)
 28     };
 29     var indexOf = function(item, source) {
 30         var index = -1;
 31         if (isArray(source)) {
 32             if (source.indexOf) {
 33                 index = source.indexOf(item)
 34             } else {
 35                 for (var i = 0,
 36                 m; m = source[i]; i++) {
 37                     if (m === item) {
 38                         index = i;
 39                         break
 40                     }
 41                 }
 42             }
 43         }
 44         return index
 45     };
 46     var MarkerClusterer = BMapLib.MarkerClusterer = function(map, options) {
 47         if (!map) {
 48             return
 49         }
 50         this._map = map;
 51         this._markers = [];
 52         this._clusters = [];
 53         var opts = options || {};
 54         this._gridSize = opts["gridSize"] || 60;
 55         this._maxZoom = opts["maxZoom"] || 18;
 56         this._minClusterSize = opts["minClusterSize"] || 2;
 57         this._isAverageCenter = false;
 58         if (opts['isAverageCenter'] != undefined) {
 59             this._isAverageCenter = opts['isAverageCenter']
 60         }
 61         this._styles = opts["styles"] || [];
 62         var that = this;
 63         this._map.addEventListener("zoomend",
 64         function() {
 65             that._redraw()
 66         });
 67         this._map.addEventListener("moveend",
 68         function() {
 69             that._redraw()
 70         });
 71         var mkrs = opts["markers"];
 72         isArray(mkrs) && this.addMarkers(mkrs)
 73     };
 74     MarkerClusterer.prototype.addMarkers = function(markers) {
 75         for (var i = 0,
 76         len = markers.length; i < len; i++) {
 77             this._pushMarkerTo(markers[i])
 78         }
 79         this._createClusters()
 80     };
 81     MarkerClusterer.prototype._pushMarkerTo = function(marker) {
 82         var index = indexOf(marker, this._markers);
 83         if (index === -1) {
 84             marker.isInCluster = false;
 85             this._markers.push(marker)
 86         }
 87     };
 88     MarkerClusterer.prototype.addMarker = function(marker) {
 89         this._pushMarkerTo(marker);
 90         this._createClusters()
 91     };
 92     MarkerClusterer.prototype._createClusters = function() {
 93         var mapBounds = this._map.getBounds();
 94         var extendedBounds = getExtendedBounds(this._map, mapBounds, this._gridSize);
 95         for (var i = 0,
 96         marker; marker = this._markers[i]; i++) {
 97             if (!marker.isInCluster && extendedBounds.containsPoint(marker.getPosition())) {
 98                 this._addToClosestCluster(marker)
 99             }
100         }
101     };
102     MarkerClusterer.prototype._addToClosestCluster = function(marker) {
103         var distance = 4000000;
104         var clusterToAddTo = null;
105         var position = marker.getPosition();
106         for (var i = 0,
107         cluster; cluster = this._clusters[i]; i++) {
108             var center = cluster.getCenter();
109             if (center) {
110                 var d = this._map.getDistance(center, marker.getPosition());
111                 if (d < distance) {
112                     distance = d;
113                     clusterToAddTo = cluster
114                 }
115             }
116         }
117         if (clusterToAddTo && clusterToAddTo.isMarkerInClusterBounds(marker)) {
118             clusterToAddTo.addMarker(marker)
119         } else {
120             var cluster = new Cluster(this);
121             cluster.addMarker(marker);
122             this._clusters.push(cluster)
123         }
124     };
125     MarkerClusterer.prototype._clearLastClusters = function() {
126         for (var i = 0,
127         cluster; cluster = this._clusters[i]; i++) {
128             cluster.remove()
129         }
130         this._clusters = [];
131         this._removeMarkersFromCluster()
132     };
133     MarkerClusterer.prototype._removeMarkersFromCluster = function() {
134         for (var i = 0,
135         marker; marker = this._markers[i]; i++) {
136             marker.isInCluster = false
137         }
138     };
139     MarkerClusterer.prototype._removeMarkersFromMap = function() {
140         for (var i = 0,
141         marker; marker = this._markers[i]; i++) {
142             marker.isInCluster = false;
143             tmplabel = marker.getLabel();
144             this._map.removeOverlay(marker);
145             marker.setLabel(tmplabel)
146         }
147     };
148     MarkerClusterer.prototype._removeMarker = function(marker) {
149         var index = indexOf(marker, this._markers);
150         if (index === -1) {
151             return false
152         }
153         tmplabel = marker.getLabel();
154         this._map.removeOverlay(marker);
155         marker.setLabel(tmplabel);
156         this._markers.splice(index, 1);
157         return true
158     };
159     MarkerClusterer.prototype.removeMarker = function(marker) {
160         var success = this._removeMarker(marker);
161         if (success) {
162             this._clearLastClusters();
163             this._createClusters()
164         }
165         return success
166     };
167     MarkerClusterer.prototype.removeMarkers = function(markers) {
168         var success = false;
169         for (var i = 0; i < markers.length; i++) {
170             var r = this._removeMarker(markers[i]);
171             success = success || r
172         }
173         if (success) {
174             this._clearLastClusters();
175             this._createClusters()
176         }
177         return success
178     };
179     MarkerClusterer.prototype.clearMarkers = function() {
180         this._clearLastClusters();
181         this._removeMarkersFromMap();
182         this._markers = []
183     };
184     MarkerClusterer.prototype._redraw = function() {
185         this._clearLastClusters();
186         this._createClusters()
187     };
188     MarkerClusterer.prototype.getGridSize = function() {
189         return this._gridSize
190     };
191     MarkerClusterer.prototype.setGridSize = function(size) {
192         this._gridSize = size;
193         this._redraw()
194     };
195     MarkerClusterer.prototype.getMaxZoom = function() {
196         return this._maxZoom
197     };
198     MarkerClusterer.prototype.setMaxZoom = function(maxZoom) {
199         this._maxZoom = maxZoom;
200         this._redraw()
201     };
202     MarkerClusterer.prototype.getStyles = function() {
203         return this._styles
204     };
205     MarkerClusterer.prototype.setStyles = function(styles) {
206         this._styles = styles;
207         this._redraw()
208     };
209     MarkerClusterer.prototype.getMinClusterSize = function() {
210         return this._minClusterSize
211     };
212     MarkerClusterer.prototype.setMinClusterSize = function(size) {
213         this._minClusterSize = size;
214         this._redraw()
215     };
216     MarkerClusterer.prototype.isAverageCenter = function() {
217         return this._isAverageCenter
218     };
219     MarkerClusterer.prototype.getMap = function() {
220         return this._map
221     };
222     MarkerClusterer.prototype.getMarkers = function() {
223         return this._markers
224     };
225     MarkerClusterer.prototype.getClustersCount = function() {
226         var count = 0;
227         for (var i = 0,
228         cluster; cluster = this._clusters[i]; i++) {
229             cluster.isReal() && count++
230         }
231         return count
232     };
233     function Cluster(markerClusterer) {
234         this._markerClusterer = markerClusterer;
235         this._map = markerClusterer.getMap();
236         this._minClusterSize = markerClusterer.getMinClusterSize();
237         this._isAverageCenter = markerClusterer.isAverageCenter();
238         this._center = null;
239         this._markers = [];
240         this._gridBounds = null;
241         this._isReal = false;
242         this._clusterMarker = new BMapLib.TextIconOverlay(this._center, this._markers.length, {
243             "styles": this._markerClusterer.getStyles()
244         })
245     }
246     Cluster.prototype.addMarker = function(marker) {
247         if (this.isMarkerInCluster(marker)) {
248             return false
249         }
250         if (!this._center) {
251             this._center = marker.getPosition();
252             this.updateGridBounds()
253         } else {
254             if (this._isAverageCenter) {
255                 var l = this._markers.length + 1;
256                 var lat = (this._center.lat * (l - 1) + marker.getPosition().lat) / l;
257                 var lng = (this._center.lng * (l - 1) + marker.getPosition().lng) / l;
258                 this._center = new BMap.Point(lng, lat);
259                 this.updateGridBounds()
260             }
261         }
262         marker.isInCluster = true;
263         this._markers.push(marker);
264         var len = this._markers.length;
265         if (len < this._minClusterSize) {
266             this._map.addOverlay(marker);
267             return true
268         } else if (len === this._minClusterSize) {
269             for (var i = 0; i < len; i++) {
270                 tmplabel = this._markers[i].getLabel();
271                 this._markers[i].getMap() && this._map.removeOverlay(this._markers[i]);
272                 this._markers[i].setLabel(tmplabel)
273             }
274         }
275         this._map.addOverlay(this._clusterMarker);
276         this._isReal = true;
277         this.updateClusterMarker();
278         return true
279     };
280     Cluster.prototype.isMarkerInCluster = function(marker) {
281         if (this._markers.indexOf) {
282             return this._markers.indexOf(marker) != -1
283         } else {
284             for (var i = 0,
285             m; m = this._markers[i]; i++) {
286                 if (m === marker) {
287                     return true
288                 }
289             }
290         }
291         return false
292     };
293     Cluster.prototype.isMarkerInClusterBounds = function(marker) {
294         return this._gridBounds.containsPoint(marker.getPosition())
295     };
296     Cluster.prototype.isReal = function(marker) {
297         return this._isReal
298     };
299     Cluster.prototype.updateGridBounds = function() {
300         var bounds = new BMap.Bounds(this._center, this._center);
301         this._gridBounds = getExtendedBounds(this._map, bounds, this._markerClusterer.getGridSize())
302     };
303     Cluster.prototype.updateClusterMarker = function() {
304         if (this._map.getZoom() > this._markerClusterer.getMaxZoom()) {
305             this._clusterMarker && this._map.removeOverlay(this._clusterMarker);
306             for (var i = 0,
307             marker; marker = this._markers[i]; i++) {
308                 this._map.addOverlay(marker)
309             }
310             return
311         }
312         if (this._markers.length < this._minClusterSize) {
313             this._clusterMarker.hide();
314             return
315         }
316         this._clusterMarker.setPosition(this._center);
317         this._clusterMarker.setText(this._markers.length);
318         var thatMap = this._map;
319         var thatBounds = this.getBounds();
320         this._clusterMarker.addEventListener("click",
321         function(event) {
322             thatMap.setViewport(thatBounds)
323         })
324     };
325     Cluster.prototype.remove = function() {
326         for (var i = 0,
327         m; m = this._markers[i]; i++) {
328             var tmplabel = this._markers[i].getLabel();
329             this._markers[i].getMap() && this._map.removeOverlay(this._markers[i]);
330             this._markers[i].setLabel(tmplabel)
331         }
332         this._map.removeOverlay(this._clusterMarker);
333         this._markers.length = 0;
334         delete this._markers
335     }
336     Cluster.prototype.getBounds = function() {
337         var bounds = new BMap.Bounds(this._center, this._center);
338         for (var i = 0,
339         marker; marker = this._markers[i]; i++) {
340             bounds.extend(marker.getPosition())
341         }
342         return bounds
343     };
344     Cluster.prototype.getCenter = function() {
345         return this._center
346     }
347 })();

 

转载 http://www.cnblogs.com/chenjiahong/p/3917528.html