Javascript 如何从geojson设置传单标记的颜色
我(出乎意料地)对传单中的样式标记有一个问题。我有一张地图,上面的列表显示了geojson()中的一些地震。问题是我想根据geojson中的mag属性设置标记颜色。我自己尝试了一些代码,但似乎什么都不适合我。您是否知道问题出在哪里或如何解决?谢谢你的帮助。 下面是我的js代码:Javascript 如何从geojson设置传单标记的颜色,javascript,leaflet,geojson,Javascript,Leaflet,Geojson,我(出乎意料地)对传单中的样式标记有一个问题。我有一张地图,上面的列表显示了geojson()中的一些地震。问题是我想根据geojson中的mag属性设置标记颜色。我自己尝试了一些代码,但似乎什么都不适合我。您是否知道问题出在哪里或如何解决?谢谢你的帮助。 下面是我的js代码: <!DOCTYPE html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<!DOCTYPE html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<link rel="stylesheet" href="leaflet.css" />
<link rel="stylesheet" href="leaflet-geojson-selector.css" />
<link rel="stylesheet" href="style.css" />
</head>
<body>
<div class="top"></div>
<div id="map"></div>
<script src="moment.min.js"> </script>
<script src="jquery.min.js"></script>
<script src="leaflet.js"></script>
<script src="leaflet-geojson-selector.js"></script>
<script>
var geoLayer, geoList,
map = new L.Map('map', {
zoomControl:false,
center: [30.9000, 31.2400],
zoom: 2,
maxBounds: [[-90,-180],[90,180]],
layers: [
L.tileLayer(
'http://{s}.basemaps.cartocdn.com/dark_all/{z}/{x}/{y}.png', {
attribution: '©
<a href="http://www.openstreetmap.org/copyright">OpenStreetMap</a> ©
<a href="http://cartodb.com/attributions">CartoDB</a>',
subdomains: 'abcd',
minZoom: 2,
maxZoom: 3,
}),
L.tileLayer('http://korona.geog.uni-heidelberg.de/tiles/roads/x={x}&y={y}&z={z}', {
maxZoom: 20,
minZoom: 4,
attribution: 'Imagery from <a href="http://giscience.uni-hd.de/">GIScience Research Group @ University of Heidelberg</a> — Map data © <a href="http://www.openstreetmap.org/copyright">OpenStreetMap</a>'
}),
]
});
map.addControl(L.control.zoom({position:'topright'}));
$.getJSON('http://earthquake.usgs.gov/earthquakes/feed/v1.0/summary/all_day.geojson', function(json) {
geoLayer = L.geoJson(json, {
onEachFeature: function(feature,layer) {
var popupText = "<b>Magnitude:</b> " + feature.properties.mag
+ "<br><b>Location:</b> " + feature.properties.place
+ "<br><a href='" + feature.properties.url + "'>More info</a>";
layer.bindPopup(popupText, {closeButton: false, offset: L.point(0, -20)});
layer.on('mouseover', function() { layer.openPopup(); });
layer.on('mouseout', function() { layer.closePopup(); });
},
pointToLayer: function (feature, latlng) {
return L.circleMarker(latlng, {
radius: Math.round(feature.properties.mag)*3,
});
},
}).addTo(map);
geoList = new L.Control.GeoJSONSelector(geoLayer, {
zoomToLayer: true,
listOnlyVisibleLayers: true
});
map.addControl(geoList);
});
</script>
</body>
</html>
var geoLayer,geoList,
map=新的L.map('map'{
动物控制:错误,
中心:[30.9000,31.2400],
缩放:2,
maxBounds:[-90,-180],[90180]],
图层:[
蒂莱耶(
'http://{s}.basemaps.cartocdn.com/dark_all/{z}/{x}/{y}.png'{
属性:'&复制;
&抄袭;
',
子域:“abcd”,
minZoom:2,
maxZoom:3,
}),
L.tileLayer('http://korona.geog.uni-heidelberg.de/tiles/roads/x={x} &y={y}&z={z}'{
maxZoom:20,
minZoom:4,
属性:“来自&mdash;地图数据&mdash;的图像”
}),
]
});
map.addControl(L.control.zoom({position:'topright'}));
$.getJSON('http://earthquake.usgs.gov/earthquakes/feed/v1.0/summary/all_day.geojson,函数(json){
geoLayer=L.geoJson(json{
onEachFeature:功能(功能,图层){
var popupText=“幅值:”+feature.properties.mag
+“
位置:”+feature.properties.place
+“
”;
layer.bindPopup(popupText,{closeButton:false,偏移量:L.point(0,-20)});
on('mouseover',function(){layer.openPopup();});
on('mouseout',function(){layer.closePopup();});
},
pointToLayer:功能(特性、latlng){
返回L.circleMarker(车床{
半径:数学圆(feature.properties.mag)*3,
});
},
}).addTo(地图);
geoList=新的L.Control.GeoJSONSelector(geoLayer{
没错,
listOnlyVisibleLayers:真
});
map.addControl(地理列表);
});
这是我的传单-geojson-selector.js:您可以根据选择的值设置标记的样式,方法是将
样式
函数添加到geojson调用:
$.getJSON('http://earthquake.usgs.gov/earthquakes/feed/v1.0/summary/all_day.geojson', function(json) {
geoLayer = L.geoJson(json, {
style: function(feature) {
var mag = feature.properties.mag;
if (mag >= 4.0) {
return { color: "red" };
}
else if (mag >= 3.0) {
return { color: "orange" };
}
else if (mag >= 2.0) {
return { color: "yellow" };
}
else {
return { color: "green" };
}
},
onEachFeature: ...
}
codepen上的简化示例:你读过吗?是的,伙计,但不知怎么的,我被困在这一点上了。。