PopUp和Graphics的使用

PopUp和Graphics的使用

实现功能

实现了鼠标点击后出现点图层并且弹出信息模板。

相关代码:

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no">
  <meta name="description" content="[Get started with popups - 4.3]">
  <!-- 
  ArcGIS API for JavaScript, https://js.arcgis.com
  For more information about the get-started-popup sample, read the original sample description at developers.arcgis.com.
  https://developers.arcgis.com/javascript/latest/get-started-popup/index.html  
  -->
  <title>Get started with popups - 4.3</title>

  <style>
    html,
    body,
    #viewDiv {
      padding: 0;
      margin: 0;
      height: 100%;
      width: 100%;
    }

    #instruction {
      z-index: 99;
      position: absolute;
      top: 15px;
      left: 50%;
      padding: 5px;
      margin-left: -175px;
      height: 20px;
      width: 350px;
      background: rgba(25, 25, 25, 0.8);
      color: white;
    }
  </style>

  <link rel="stylesheet" href="https://js.arcgis.com/4.3/esri/css/main.css">
  <script src="https://js.arcgis.com/4.3/"></script>

  <script>
    require([
      "esri/tasks/Locator",
      "esri/Map",
      "esri/views/MapView",
      "esri/symbols/SimpleMarkerSymbol",
      "esri/Graphic",
      "esri/geometry/Point",
      "dojo/domReady!"
    ], function(
      Locator,
      Map,
      MapView,
      SimpleMarkerSymbol,
      Graphic,
      Point
    ) {

      // Set up a locator task using the world geocoding service
      var locatorTask = new Locator({
        url: "https://geocode.arcgis.com/arcgis/rest/services/World/GeocodeServer"
      });

      //add a graphic layer


      // Create the Map
      var map = new Map({
        basemap: "streets-navigation-vector"
      });

      // Create the MapView
      var view = new MapView({
        container: "viewDiv",
        map: map,
        center: [-116.3031, 43.6088],
        zoom: 12
      });

      function addPoint(x,y){
        if(!view.isRejected()){
          view.graphics.removeAll();
        }
        let  point = new Point({
        longitude:x,
        latitude: y 
      }),

      markerSymbol = new SimpleMarkerSymbol({
        color: [226, 119, 40],
        outline: { // autocasts as new SimpleLineSymbol()
          color: [255, 255, 255],
          width: 2
        }
      }),
              // Create a graphic and add the geometry and symbol to it
      pointGraphic = new Graphic({
        geometry: point,
        symbol: markerSymbol
      });
        view.graphics.addMany([pointGraphic]);
      }

      /*******************************************************************
       * This click event sets generic content on the popup not tied to
       * a layer, graphic, or popupTemplate. The location of the point is
       * used as input to a reverse geocode method and the resulting
       * address is printed to the popup content.
       *******************************************************************/
      view.on("click", function(event) {
        // Get the coordinates of the click on the view
        var lat = Math.round(event.mapPoint.latitude * 1000) / 1000;
        var lon = Math.round(event.mapPoint.longitude * 1000) / 1000;
        addPoint(lon,lat);
        view.popup.open({
          // Set the popup's title to the coordinates of the location
          title: "Reverse geocode: [" + lon + ", " + lat + "]",
          location: event.mapPoint // Set the location of the popup to the clicked location
        });

        // Display the popup
        // Execute a reverse geocode using the clicked location
        locatorTask.locationToAddress(event.mapPoint).then(function(
          response) {
          // If an address is successfully found, print it to the popup's content
          var address = response.address.Match_addr;
          view.popup.content = address;
        }).otherwise(function(err) {
          // If the promise fails and no result is found, print a generic message
          // to the popup's content
          view.popup.content =
            "No address was found for this location";
        });
      });
    });
  </script>
</head>

<body>
  <div id="viewDiv"></div>
  <div id="instruction">Click any location on the map to see its street address</div>
</body>

</html>

实现效果展示

1-1

1-2

如果读者你细心的话

发现两个效果图的不同点:

告诉你原因，很简单，博主小小的写了一个判断:

        if(!view.isRejected()){
          view.graphics.removeAll();
        }

就这样，一个简单的练手搞定!

在GIS的沙场，传播有价值的东西!