最近项目需要用到地图，因为是用于公众号，索性就用了腾讯地图。开发过程中新增一个需求：标注在缩小地图后要聚合。查看文档，实现起来并不难，照着文档做了之后发现marker是聚合了，但label没有聚合，这就很影响用户体验了，如下图：
在没有聚合之前只这样的：
没聚合的情况下是没毛病的。
但聚合之后就成这样了：
这样看起来很别扭吧，必须要让label也聚合才行。
继续查看文档，以为会有相关属性可以直接设置，结果没找到。文档没有找百度咯，寻寻觅觅也没找到个答案，没办法了，只能靠自己了。
还是看文档https://lbs.qq.com/javascript_v2/doc/marker.html，这里我发现了marker的一个事件：map_changed（当标注map属性更改时会触发此事件），当标注聚合或分离的时候可以出发这个事件。因此，我们可以利用这个来设置label的聚合与分离（实际就是设置label的显示隐藏）。那么如何设置label的显示隐藏呢，继续看文档https://lbs.qq.com/javascript_v2/doc/label.html，label有的setVisible方法可以设置label的显示隐藏。废话不多说，直接上代码（实际项目涉及内容比较多，这里就直接在官方给的案例中改了）案例地址https://lbs.qq.com/javascript_v2/case-run.html#overlay-markercluster
<!DOCTYPE>
<html>
<head>
<title>MarkerCluster</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<script charset="utf-8" src="https://map.qq.com/api/js?v=2.exp&key=OB4BZ-D4W3U-B7VVO-4PJWW-6TKDJ-WPB77"></script>
<style type="text/css">
ul, li {
margin: 0;
padding: 0;
}
#map_canvas {
position: absolute;
left: 320px;
min- 800px;
min-height: 767px;
border: 1px solid #ff0000;
}
#panel {
position: relative;
300px;
height: 500px;
overflow: auto;
border: 1px solid #000000;
}
#attributeList li {
border-bottom: 1px dashed #999999;
padding: 5px 5px;
line-height: 20px;
}
</style>
</head>
<body onload="window.init()">
<div id="map_canvas"></div>
<div id="panel">
<div>
设置属性：
<ul id="attributeList">
<li>
<span>gridSize:</span>
<select id="gridSize">
<option value="60" selected="selected">Default</option>
<option value="40">40</option>
<option value="50">50</option>
<option value="70">70</option>
<option value="80">80</option>
<option value="500">500</option>
</select>
</li>
<li>
<span>maxZoom</span>
<select id="maxZoom">
<option value="" selected="selected">Default</option>
<option value="7">7</option>
<option value="8">8</option>
<option value="9">9</option>
<option value="10">10</option>
<option value="11">11</option>
<option value="12">12</option>
<option value="13">13</option>
<option value="14">14</option>
</select>
<div>
<span>当前地图级别：<span id="mapZoomLevel"></span></span>
</div>
</li>
<li>
<span>averageCenter:</span>
<label>
<input id="averageCenter_true" type="radio" value="true" name="averageCenter"/>
<span>true</span>
</label>
<label>
<input id="averageCenter_false" type="radio" value="false" name="averageCenter" checked="checked"/>
<span>false</span>
</label>
</li>
<li>
<span>minimumClusterSize:</span>
<select id="minimumClusterSize">
<option value="1">1</option>
<option value="2" selected="selected">2</option>
<option value="3">3</option>
<option value="4">4</option>
<option value="5">5</option>
</select>
</li>
<li>
<span>styles</span>
<select id="styles">
<option value="" selected="">Default</option>
<option value="People">People</option>
<option value="Conversation">Conversation</option>
</select>
</li>
<li>
<span>zoomOnClick:</span>
<label>
<input id="zoomOnClick_true" type="radio" value="true" name="zoomOnClick" checked="checked"/>
<span>true</span>
</label>
<label>
<input id="zoomOnClick_false" type="radio" value="false" name="zoomOnClick"/>
<span>false</span>
</label>
</li>
<li>
<input id="addMarkerBt" type="button" name="addMarkerBt" value='添加marker'/>
<input id="addMarkersBt" type="button" name="addMarkersBt" value='添加多个marker'/>
<input id="removeMarkerBt" type="button" name="removeMarkerBt" value='移除marker'/>
<input id="removeMarkersBt" type="button" name="removeMarkersBt" value='移除多个marker'/>
<input id="clearMarkersBt" type="button" name="clearMarkersBt" value='清除marker'/>
</li>
</ul>
</div>
<hr/>
</div>
<script type="text/javascript">
var markerIndex = 0;
var map;
function $(a) {
return document.getElementById(a);
}
var data = [
[39.959228, 116.367874],
[39.984486, 116.427612],
[39.988169, 116.279984],
[39.847558, 116.402893],
[39.941857, 116.383667],
[40.022882, 116.551208],
[39.819085, 116.581421],
[39.924482, 116.205826],
[39.757880, 116.162567],
[39.631606, 116.325989],
[39.797986, 116.415253],
[40.117990, 116.416626],
[40.271668, 116.638412],
[40.143190, 116.236038],
[39.928168, 116.515503],
[39.902362, 116.389160],
[39.935539, 116.377487]
];
window.init = function() {
var Map = qq.maps.Map;
var Marker = qq.maps.Marker;
var LatLng = qq.maps.LatLng;
var Event = qq.maps.event;
var MarkerImage = qq.maps.MarkerImage;
var MarkerShape = qq.maps.MarkerShape;
var MarkerAnimation = qq.maps.MarkerAnimation;
var Point = qq.maps.Point;
var Size = qq.maps.Size;
var ALIGN = qq.maps.ALIGN;
var MVCArray = qq.maps.MVCArray;
var MarkerCluster = qq.maps.MarkerCluster;
var Cluster = qq.maps.Cluster;
var MarkerDecoration = qq.maps.MarkerDecoration;
var forEach = function (array, fun) {
for (var i = 0, l = array.length; i < l; ++i) {
if (fun(array[i], i) === false) {
return false;
}
}
};
var latlng = new LatLng(39.91, 116.38);
var options = {
'zoom':11,
'center':latlng,
'mapTypeId':"roadmap"
};
var map = new Map($('map_canvas'), options);
var markers = new MVCArray();
var markerCluster;
function createCluster() {
for (var i = 0; i < data.length; i++) {
var latLng = new LatLng(data[i][0], data[i][1]);
var decoration = new MarkerDecoration(i, new Point(0, -5));
var marker = new Marker({
'position':latLng,
map:map
});
let label = new qq.maps.Label({
position: latLng,
map: map,
content: '我是label'
});
qq.maps.event.addListener(marker, 'map_changed', function(e) {
if (e.target.isClustered) {
console.log('聚合了')
label.setVisible(false)
} else {
console.log('分开了')
label.setVisible(true)
}
})
markers.push(marker);
}
markerClusterer = new MarkerCluster({
map:map,
minimumClusterSize:2, //默认2
markers:markers,
zoomOnClick:true, //默认为true
gridSize:30, //默认60
averageCenter:true, //默认false
maxZoom:18, //默认18
});
Event.addListener(markerClusterer, 'clusterclick', function (evt) {
// writeLog("mouse event", eventType);
var ss = evt;
// alert('点击了聚合点');
});
};
createCluster();
var imgPath = "./images/";
var Styles = {
"People":[
{
icon:new MarkerImage(imgPath + "people35.png", new Size(35, 35), new Point(0, 0), new Point(16, 0)),
text:new MarkerDecoration('<font style="color:#ff00ff;font-size:10px;font-weight:bold;">{num}</font>', new Point(0, 5))
}
],
"Conversation":[
{
icon:new MarkerImage(imgPath + "conv30.png", new Size(30, 27), new Point(0, 0), new Point(3, 0)),
text:new MarkerDecoration('<font style="color:#ff00ff;font-size:10px;font-weight:bold;">{num}</font>', new Point(0, -2))
}
]
};
var maker_add;
function addMarker(index) {
var latLng = new LatLng(39.849558,116.406893);
var decoration = new MarkerDecoration(index, new Point(0, -5));
maker_add = new Marker({
'position':latLng,
decoration:decoration,
map:map
});
markers.push(maker_add);
markerClusterer.addMarker(maker_add);
}
var markers_add = [];
function addMarkers() {
var bounds = map.getBounds();
var sw = bounds.getSouthWest();
var ne = bounds.getNorthEast();
var lngSpan = Math.abs(sw.getLng() - ne.getLng());
var latSpan = Math.abs(ne.getLat() - sw.getLat());
for (var i=0; i < 100; i++) {
var position = new qq.maps.LatLng(ne.getLat() - latSpan*(Math.random()*0.95), sw.getLng() + lngSpan*(Math.random()*0.95));
var decoration = new MarkerDecoration(i, new Point(0, -5));
var makeradd = new Marker({
'position':position,
decoration:decoration,
map:map
});
markers_add.push(makeradd);
}
markerClusterer.addMarkers(markers_add);
}
function removeMarker() {
markerClusterer.removeMarker(maker_add);
}
function removeMarkers() {
markerClusterer.removeMarkers(markers_add);
}
function clearMarkers() {
markerClusterer.clearMarkers();
}
function setMarkerClusterOption(key, value) {
markerClusterer.set(key, value);
}
var setKeyHandle = {
'gridSize': 'setGridSize',
'maxZoom': 'setMaxZoom',
'averageCenter' : 'setAverageCenter'
};
var getKeyHandle = {
'gridSize': 'getGridSize',
'maxZoom': 'getMaxZoom',
'averageCenter' : 'getAverageCenter'
};
var gridSize = $("gridSize");
Event.addDomListener(gridSize, "change", function () {
setMarkerClusterOption("gridSize", parseInt(this.value));
});
var maxZoom = $("maxZoom");
Event.addDomListener(maxZoom, "change", function () {
setMarkerClusterOption("maxZoom", this.value ? parseInt(this.value) : null);
});
var addmarker = $("addMarkerBt");
Event.addDomListener(addmarker, "click", function () {
markerIndex++;
addMarker(markerIndex);
});
var removeMarkerb = $("removeMarkerBt");
Event.addDomListener(removeMarkerb, "click", function () {
removeMarker();
});
var addmarker = $("addMarkersBt");
Event.addDomListener(addmarker, "click", function () {
addMarkers();
});
var removeMarkerb = $("removeMarkersBt");
Event.addDomListener(removeMarkerb, "click", function () {
removeMarkers();
});
var clearMarkerb = $("clearMarkersBt");
Event.addDomListener(clearMarkerb, "click", function () {
clearMarkers();
});
var minimumClusterSize = $("minimumClusterSize");
Event.addDomListener(minimumClusterSize, "change", function () {
setMarkerClusterOption("minimumClusterSize", parseInt(this.value));
});
var averageCenter_true = $("averageCenter_true");
Event.addDomListener(averageCenter_true, "click", function () {
setMarkerClusterOption("averageCenter", true);
});
var averageCenter_false = $("averageCenter_false");
Event.addDomListener(averageCenter_false, "click", function () {
setMarkerClusterOption("averageCenter", false);
});
var zoomOnClick_true = $("zoomOnClick_true");
Event.addDomListener(zoomOnClick_true, "click", function () {
setMarkerClusterOption("zoomOnClick", true);
});
var zoomOnClick_false = $("zoomOnClick_false");
Event.addDomListener(zoomOnClick_false, "click", function () {
setMarkerClusterOption("zoomOnClick", false);
});
var stylesSelect = $("styles");
Event.addDomListener(stylesSelect, "change", function () {
setMarkerClusterOption("styles", Styles[this.value] ? Styles[this.value] : null);
});
};
</script>
</body>
</html>
上面代码中黄色部分就是设置label聚合分离的代码，效果如下：
这样体验就好多了。
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关于如何解决腾讯地图MarkerCluster聚合后label不聚合的问题就到这里了，如有任何问题或高见欢迎提出来，也可以联系我QQ：412606846（微信同号）