在leaflet中为圆形标记添加静态标签

Question

我正在尝试在Leaflet中给我的圆形标记添加额外的标签。

目前我的代码是这样的： 但我需要有这样的效果： 以下是我的代码部分：

var Classroomsbyamount = new L.LayerGroup();
var Classroomsamount = new L.geoJson(buildingPoints, { 
    pointToLayer: function(feature, latlng) {
        if(feature.properties.Classroomsstyleamt) {
        return new L.CircleMarker(latlng, feature.properties.Classroomsstyleamt, {radius: feature.radius}); }
    }, 
    onEachFeature: function(feature, layer) { 
        if (feature.properties && feature.properties.building_name) { 
            var thenumber20 = feature.properties.spacecategoryClassroomsamt; 
            var number30 = thenumber20.toLocaleString('en');
            layer.bindPopup({ html: '<b>' + number30 + '</b>' });
            layer.bindPopup(feature.properties.building_name + "<br> Amount:" + number30, {maxWidth: "none", closeButton: true, offset: L.point(0, -20)});
            layer.on('mouseover', function() { layer.openPopup(); }); 
            layer.on('click', function() { 
                var capacityGroup = feature.properties.building_name;
                popUp(capacityGroup);
            });
        }
    }



}).addTo(Classroomsbyamount);

如何在地图上给我的圆形添加标签？

- bohdan baida

Answer 1

一个相对简单的解决方案是为每个特性创建一个永久的工具提示，以圆圈的坐标为中心。

类似于：

onEachFeature: function(feature, layer) {
    var text = L.tooltip({
        permanent: true,
        direction: 'center',
        className: 'text'
    })
    .setContent("some text")
    .setLatLng(layer.getLatLng());
    text.addTo(Classroomsbyamount);

    // rest of your code
}

And a demo

var map = L.map(document.getElementById('map')).setView([48.8583736, 2.2922926], 12);
L.tileLayer('http://{s}.tile.osm.org/{z}/{x}/{y}.png', {
        attribution: '&copy; <a href="http://osm.org/copyright">OpenStreetMap</a> contributors'
}).addTo(map);

var buildingPoints = [
{
    "type": "Feature",
    "geometry": {
        "type": "Point",
        "coordinates": [2.2922926, 48.85]
    },
    "properties": {
        "text": "5",
        "radius": 60
    }
},
{
    "type": "Feature",
    "geometry": {
        "type": "Point",
        "coordinates": [2.35, 48.86]
    },
    "properties": {
        "text": "4",
        "radius": 40
    }
}
];

var Classroomsamount = new L.geoJson(buildingPoints, {
    pointToLayer: function(feature, latlng) {
        return new L.CircleMarker([latlng.lat, latlng.lng], {radius: feature.properties.radius});
    },
    onEachFeature: function(feature, layer) {
        var text = L.tooltip({
            permanent: true,
            direction: 'center',
            className: 'text'
        })
        .setContent(feature.properties.text)
        .setLatLng(layer.getLatLng());
        text.addTo(map);
        
        
        var text2 = L.tooltip({
            direction: 'top',
            className: 'text2'
        })
        .setContent(feature.properties.text)
        .setLatLng(layer.getLatLng());
        layer.bindTooltip(text2);
    }
}).addTo(map);

html, body {
  height: 100%;
  margin: 0;
}
#map {
  width: 100%;
  height: 100%;
}

.leaflet-tooltip-pane .text {
  color: red; 
  font-weight: bold;
  background: transparent;
  border:0;
  box-shadow: none;
  font-size:2em;
}

<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/leaflet/1.3.1/leaflet.css"/>
<script src="https://cdnjs.cloudflare.com/ajax/libs/leaflet/1.3.1/leaflet.js"></script>
   
<div id='map'></div>

- nikoshr

---

感谢您的回答。 但是，如果我已经在使用tooltip()，我该如何定义另一个tooltip呢？因为现在如果我放置您的代码，它会显示以下错误： Uncaught TypeError: Cannot read property '_getTooltipAnchor' of undefined Renderer.js:1 - bohdan baida

@bohdanbaida 在您的圆圈上使用工具提示并不会阻止添加其他工具提示。我已经修改了我的示例来演示它。 - nikoshr