请注意，我能够轻松地使用geojson数据并在传单地图上创建一个图层。另外，尝试使用libarcgis-to-geojson-utils但无法使其正常工作。 这是我的代码。
非常感谢您的帮助。
view.when()
.then(fetchData)
.then(createGraphics)
.then(createLayer)
.then(addToView)
.catch(function(e) {
console.error("Creating FeatureLayer failed", e);
})
function fetchData() {
return fetch(url,options)
.then(response => {
return response.json()
});
}
function createGraphics(schoolsGeoData) {
const geoData = JSON.parse(schoolsGeoData);
return geoData.features.map((school, i) => {
let schoolAttr = {
OBJECTID: school.properties["id"],
name: school.properties["name"]
}
return new Graphic({
// type: "point",
attributes: schoolAttr,
geometry: new Point({
x: school.geometry.coordinates[0],
y: school.geometry.coordinates[1]
}),
});
})
}
function createLayer(graphics) {
return new FeatureLayer({
source: graphics,
objectIdField: "OBJECTID",
fields: schoolFeilds(),
popupTemplate: schoolTemplate(),
renderer: myRenderer(),
geometryType: "point" ,
spatialReference: {
wkid: 4326
},
});
}
function addToView(layer) {
if(layer) {
view.map.add(layer);
}
}
你的代码有一个合理的逻辑，当然缺少一些东西，我不知道它们正在工作。例如，我不知道您在操作中添加了哪些选项fetch但默认情况下它会正确获取数据，并且您不必转换为JSON因为它意识到了这一点。
我实际上打算要求您提供更多代码，或者您的问题到底是什么，但我决定提醒您，您实际上有一个特定的层来处理 GeoJSON 数据，GeoJSONLayer。
- ArcGIS API - GeoJSONLayer
- ArcGIS 示例 - GeoJSONLayer
但是，无论如何，我将在这里为您提供一个运行示例，说明您正在尝试执行的操作，获取数据并使用FeatureLayer，使用我提到的示例中的数据，
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<meta
name="viewport"
content="initial-scale=1,maximum-scale=1,user-scalable=no"
/>
<title>GeoJSON with FeatureLayer - 4.15</title>
<style>
html,
body,
#viewDiv {
padding: 0;
margin: 0;
height: 100%;
width: 100%;
}
</style>
<link
rel="stylesheet"
href="https://js.arcgis.com/4.15/esri/themes/light/main.css"
/>
<script src="https://js.arcgis.com/4.15/"></script>
<script>
require([
"esri/Map",
"esri/views/MapView",
"esri/layers/FeatureLayer",
"esri/Graphic"
], function(Map, MapView, FeatureLayer, Graphic) {
const map = new Map({
basemap: "gray"
});
const view = new MapView({
center: [-80, 35],
zoom: 8,
map,
container: "viewDiv"
});
view.when()
.then(fetchData)
.then(createGraphics)
.then(createLayer)
.then(addToView)
.catch(function(e) {
console.error("Creating FeatureLayer failed", e);
})
function fetchData() {
return fetch(
'https://earthquake.usgs.gov/earthquakes/feed/v1.0/summary/all_month.geojson'
)
.then(response => {
return response.json()
});
}
function createGraphics(data) {
// const geoData = JSON.parse(data);
return data.features.map((feature, i) => {
return new Graphic({
attributes: {
OBJECTID: i,
title: feature.properties["title"],
mag: feature.properties["mag"],
type: feature.properties["type"],
place: feature.properties["place"],
time: feature.properties["time"]
},
geometry: {
type: "point",
x: feature.geometry.coordinates[0],
y: feature.geometry.coordinates[1]
},
});
})
}
function createLayer(graphics) {
const popupTemplate = {
title: "{title}",
content: "Magnitude {mag} {type} hit {place} on {time}",
fieldInfos: [
{
fieldName: "time",
format: {
dateFormat: "short-date-short-time"
}
}
],
outFields: ["title", "mag", "type", "place", "time"]
}
const renderer = {
type: "simple",
field: "mag",
symbol: {
type: "simple-marker",
color: "orange",
outline: {
color: "white"
}
},
visualVariables: [
{
type: "size",
field: "mag",
stops: [
{
value: 2.5,
size: "10px"
},
{
value: 8,
size: "40px"
}
]
}
]
};
return new FeatureLayer({
source: graphics,
fields: [{
name: "OBJECTID",
alias: "ObjectID",
type: "oid"
}, {
name: "title",
alias: "Title",
type: "string"
}
, {
name: "mag",
alias: "Magnitude",
type: "double"
}
, {
name: "type",
alias: "Type",
type: "string"
}, {
name: "place",
alias: "Place",
type: "string"
}, {
name: "time",
alias: "Time",
type: "date"
}],
objectIdField: "OBJECTID",
popupTemplate,
renderer
});
}
function addToView(layer) {
if(layer) {
view.map.add(layer);
}
}
});
</script>
</head>
<body>
<div id="viewDiv"></div>
</body>
</html>