解決騰訊地圖marker聚合後label不聚合的問題（推薦）

時間 2019-12-09

原文原文鏈接

　　最近項目須要用到地圖，由於是用於公衆號，索性就用了騰訊地圖。開發過程當中新增一個需求：標註在縮小地圖後要聚合。查看文檔，實現起來並不難，照着文檔作了以後發現marker是聚合了，但label沒有聚合，這就很影響用戶體驗了，以下圖：javascript

　　在沒有聚合以前只這樣的：css

　　沒聚合的狀況下是沒毛病的。html

　　但聚合以後就成這樣了：java

　　這樣看起來很彆扭吧，必需要讓label也聚合才行。canvas

　　繼續查看文檔，覺得會有相關屬性能夠直接設置，結果沒找到。文檔沒有找百度咯，尋尋覓覓也沒找到個答案，沒辦法了，只能靠本身了。api

　　仍是看文檔https://lbs.qq.com/javascript_v2/doc/marker.html，這裏我發現了marker的一個事件：map_changed（當標註map屬性更改時會觸發此事件），當標註聚合或分離的時候能夠出發這個事件。所以，咱們能夠利用這個來設置label的聚合與分離（實際就是設置label的顯示隱藏）。那麼如何設置label的顯示隱藏呢，繼續看文檔https://lbs.qq.com/javascript_v2/doc/label.html，label有的setVisible方法能夠設置label的顯示隱藏。廢話很少說，直接上代碼（實際項目涉及內容比較多，這裏就直接在官方給的案例中改了）案例地址https://lbs.qq.com/javascript_v2/case-run.html#overlay-markercluster微信

<!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-width: 800px;
            min-height: 767px;
            border: 1px solid #ff0000;
        }

        #panel {
            position: relative;
            width: 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>
        設置屬性：
        <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>當前地圖級別：<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='添加多個marker'/>
                <input id="removeMarkerBt" type="button"  name="removeMarkerBt" value='移除marker'/>
                <input id="removeMarkersBt" type="button"  name="removeMarkersBt" value='移除多個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('分開了')
                label.setVisible(true) } })
            markers.push(marker);
        }

        markerClusterer = new MarkerCluster({
            map:map,
            minimumClusterSize:2, //默認2
            markers:markers,
            zoomOnClick:true, //默認爲true
            gridSize:30, //默認60
            averageCenter:true, //默認false
            maxZoom:18, //默認18
        });

        Event.addListener(markerClusterer, 'clusterclick', function (evt) {
            // writeLog("mouse event", eventType);
            var ss =  evt;
            // alert('點擊了聚合點');
        });
    };

    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>