更新geojson的属性以将其与传单一起使用 [英] update properties of geojson to use it with leaflet
问题描述
我需要使用leaflet.js将地图添加到我的网站.该站点具有一个管理视图,管理员可以在其中添加标记,并向每个标记添加描述和图像.
I have a requirement of using leaflet.js to add a map to my site. The site has an administration view where an admin can add markers and add description and image to each marker.
我使用了leaflet.draw插件,在创建事件中,我尝试更新使用event.layer.toGeoJSON()
获得的GeoJSON对象,以添加一些属性,例如图像和文本,但是没有运气.
I used the leaflet.draw plugin, and on the create event I try to update the GeoJSON object I got using event.layer.toGeoJSON()
to add some properties like image and text but with no luck.
有人可以帮我吗?
var osmUrl = 'http://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png',
osmAttrib = '© <a href="http://openstreetmap.org/copyright">OpenStreetMap</a> contributors',
osm = L.tileLayer(osmUrl, {
maxZoom: 18,
attribution: osmAttrib
});
map = new L.Map('map', {
layers: [osm],
center: new L.LatLng(31.9500, 35.9333),
zoom: 15
}),
drawnItems = L.geoJson().addTo(map);
map.addControl(new L.Control.Draw({
edit: {
featureGroup: drawnItems
}
}));
map.on('draw:created', function(event) {
var layer = event.layer;
var json = event.layer.toGeoJSON();
json.properties.desc = null;
json.properties.image = null;
drawnItems.addLayer(L.GeoJSON.geometryToLayer(json));
addPopup(layer);
});
function addPopup(layer) {
var content = '<input id="markerDesc" type="text"/ onblur="saveData(layer);">';
layer.bindPopup(content).openPopup();
alert('out');
}
function saveData(layer) {
var markerDesc = $('#markerDesc').val();
var json = layer.toGeoJSON();
json.feature.properties.desc = markerDesc;
}
推荐答案
您的"draw:created"
侦听器中无需将其转换为GeoJSON,然后再返回到图层.
There is no need in your "draw:created"
listener to convert into GeoJSON and then back to a layer.
顺便说一句,然后将弹出窗口添加到layer
,而您无需对其进行任何操作,因为您已将其转换为GeoJSON数据并从该数据中创建了一个新层.
By the way, you then add a popup to layer
whereas you do not do anything with it, since you transformed it into GeoJSON data and created a new layer out of that data.
只需创建以下结构,以便稍后将存储的数据转换为GeoJSON(如果您需要此功能):layer.feature.type = "Feature"
和layer.feature.properties
.
Simply create the following structure, so that the stored data can be converted into GeoJSON later on (if you ever need that functionality): layer.feature.type = "Feature"
and layer.feature.properties
.
var osmUrl = 'http://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png',
osmAttrib = '© <a href="http://openstreetmap.org/copyright">OpenStreetMap</a> contributors',
osm = L.tileLayer(osmUrl, {
maxZoom: 18,
attribution: osmAttrib
});
map = L.map('map', {
layers: [osm],
center: [31.9500, 35.9333],
zoom: 15
});
var drawnItems = L.geoJson().addTo(map);
map.addControl(new L.Control.Draw({
edit: {
featureGroup: drawnItems
}
}));
map.on('draw:created', function (event) {
var layer = event.layer,
feature = layer.feature = layer.feature || {};
feature.type = feature.type || "Feature";
var props = feature.properties = feature.properties || {};
props.desc = null;
props.image = null;
drawnItems.addLayer(layer);
addPopup(layer);
});
function addPopup(layer) {
var content = document.createElement("textarea");
content.addEventListener("keyup", function () {
layer.feature.properties.desc = content.value;
});
layer.on("popupopen", function () {
content.value = layer.feature.properties.desc;
content.focus();
});
layer.bindPopup(content).openPopup();
}
演示: https://jsfiddle.net/ve2huzxw/314/
已编辑:先前的代码实际上没有很好地实现GeoJSON properties
功能(由于缺少layer.feature.type = "Feature"
,因此保存在geometry
而不是feature
上,另请参见将FeatureGroup转换为GeoJson时,Leaflet Draw不采用属性)
Edited: previous code did not actually implemented well the GeoJSON properties
functionality (was saved on geometry
instead of feature
, due to missing layer.feature.type = "Feature"
, see also Leaflet Draw not taking properties when converting FeatureGroup to GeoJson)
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