如何获取并理解ArcGIS JS源代码？-酷北运营网

ArcGIS JavaScript 开发指南

ArcGIS JavaScript API 是 Esri 提供的一款强大的地图应用程序开发工具，它允许开发者使用 JavaScript 来创建交互式地图和地理信息系统（GIS）应用，以下是如何使用 ArcGIS JavaScript API 的一些基本步骤和代码示例。

1. 引入 ArcGIS JavaScript API

你需要在你的 HTML 文件中引入 ArcGIS JavaScript API，你可以选择从 CDN 加载或者下载到本地。

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>ArcGIS JavaScript API Example</title>
    <link rel="stylesheet" href="https://js.arcgis.com/4.25/esri/themes/light/main.css">
    <script src="https://js.arcgis.com/4.25/"></script>
    <style>
        html, body, #viewDiv {
            padding: 0;
            margin: 0;
            height: 100%;
            width: 100%;
        }
    </style>
</head>
<body>
    <div id="viewDiv"></div>
    <script>
        require([
            "esri/Map",
            "esri/views/MapView",
            "esri/layers/TileLayer"
        ], function(Map, MapView, TileLayer) {
            var map = new Map({
                basemap: "streets"
            });
            var view = new MapView({
                container: "viewDiv",
                map: map,
                center: [15, 65], // longitude, latitude
                zoom: 4
            });
        });
    </script>
</body>
</html>

2. 创建一个地图视图

使用esri/Map 和esri/views/MapView 类来创建和显示一个地图视图，上面的代码已经展示了如何做到这一点。

3. 添加图层

你可以向地图中添加不同类型的图层，例如矢量图层、瓦片图层等，以下是一个添加瓦片图层的示例：

require([
    "esri/Map",
    "esri/views/MapView",
    "esri/layers/TileLayer"
], function(Map, MapView, TileLayer) {
    var map = new Map({
        basemap: "topo-vector"
    });
    var aerialLayer = new TileLayer({
        url: "https://server.arcgisonline.com/ArcGIS/rest/services/World_Imagery/MapServer"
    });
    map.add(aerialLayer);
    var view = new MapView({
        container: "viewDiv",
        map: map,
        center: [15, 65], // longitude, latitude
        zoom: 4
    });
});

4. 添加弹出窗口

当用户点击地图上的某个要素时，可以显示一个弹出窗口，以下是一个添加弹出窗口的示例：

require([
    "esri/Map",
    "esri/views/MapView",
    "esri/layers/FeatureLayer",
    "esri/widgets/Popup"
], function(Map, MapView, FeatureLayer, Popup) {
    var map = new Map({
        basemap: "streets"
    });
    var view = new MapView({
        container: "viewDiv",
        map: map,
        center: [15, 65], // longitude, latitude
        zoom: 4
    });
    var featureLayer = new FeatureLayer({
        url: "https://services.arcgis.com/XXXX/arcgis/rest/services/SampleWorldCities/MapServer/0",
        outFields: ["*"],
        popupTemplate: { // autocasts as popupTemplate from popupTemplate
            title: "{NAME}",
            content: "{POP_EST}"
        }
    });
    map.add(featureLayer);
    view.when(function() {
        var popup = new Popup({}, null, "bottom-right");
        view.ui.add(popup, "bottom-left");
    });
});

5. 添加图形绘制工具

你可以使用esri/widgets/Drawing 模块来启用图形绘制功能，以下是一个添加图形绘制工具的示例：

require([
    "esri/Map",
    "esri/views/MapView",
    "esri/widgets/Drawing"
], function(Map, MapView, Drawing) {
    var map = new Map({
        basemap: "streets"
    });
    var view = new MapView({
        container: "viewDiv",
        map: map,
        center: [15, 65], // longitude, latitude
        zoom: 4
    });
    var drawingToolbar = new Drawing({ view: view });
    view.ui.add(drawingToolbar, "top-right");
});

问题 1：如何在地图上添加标记？

答：你可以在地图上添加标记，通过在地图上创建一个点要素来实现，以下是一个添加标记的示例：

require([
    "esri/Map",
    "esri/views/MapView",
    "esri/Graphic",
    "esri/layers/GraphicsLayer",
    "esri/geometry/Point"
], function(Map, MapView, Graphic, GraphicsLayer, Point) {
    var map = new Map({
        basemap: "streets"
    });
    var view = new MapView({
        container: "viewDiv",
        map: map,
        center: [15, 65], // longitude, latitude
        zoom: 4
    });
    var graphicsLayer = new GraphicsLayer();
    map.add(graphicsLayer);
    var point = new Point({
        longitude: -118.80500,  // longitude
        latitude: 34.02700     // latitude
    });
    var simpleMarkerSymbol = {
        type: "simple-marker",  // autocasts as SimpleFillSymbol
        color: [255, 255, 0],  // yellow color in hex format
        size: "8px",            // size of the marker
        outline: {              // autocasts as SimpleLineSymbol
            color: [0, 0, 0],    // black outline color in hex format
            width: "1px"         // width of the outline
        }
    };
    var markerSymbol = {
        type: "picture-marker",  // autocasts as PictureMarkerSymbol
        url: "https://www.example.com/marker-icon.png",  // URL to the image for the marker symbol
        width: "32px",          // width of the picture marker (optional)
        height: "32px"           // height of the picture marker (optional)
    };
    var markerGraphic = new Graphic({
        geometry: point,                   // set the geometry (where you want to place the marker)
        symbol: simpleMarkerSymbol,       // set the marker symbol (you can use either simple or picture marker)
        popupTemplate: {                   // autocasts as popupTemplate from popupTemplate
            title: "My Marker",           // title of text for the popup window (optional)
            content: "This is my marker!"  // content text for the popup window (optional)
        }
    });
    graphicsLayer.add(markerGraphic); // add the marker graphic to the graphics layer (which has been added to the map)

以上内容就是解答有关“arcgis js 源代码”的详细内容了，我相信这篇文章可以为您解决一些疑惑，有任何问题欢迎留言反馈，谢谢阅读。