JS API 3x on selection event not firing

277
1
07-17-2019 01:00 AM
DanielChristensen1
New Contributor II

I want an event to fire when a selection is made on a specific layer.

This is my code:

lyr = this.map.getLayer("Grunddata_public_7660");
console.log(lyr);
lyr.on("selection-complete", function() {
alert("lyr selected");
});

I am in doubt of where I go wrong.

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1 Reply
KenBuja
MVP Honored Contributor

I made a modification (lines 80-84) to one of the samples that uses the selectFeatures method and the alert pops up as expected.

<!DOCTYPE html>
<html>
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
    
    <meta name="viewport" content="initial-scale=1, maximum-scale=1,user-scalable=no">
    <title>Select with feature layer</title>
    <link rel="stylesheet" href="https://js.arcgis.com/3.29/dijit/themes/tundra/tundra.css">
    <link rel="stylesheet" href="https://js.arcgis.com/3.29/esri/css/esri.css">
    <style>
      html, body, #mapDiv {
        padding: 0;
        margin: 0;
        height: 100%;
      }
      #messages{
        background-color: #fff;
        box-shadow: 0 0 5px #888;
        font-size: 1.1em;
        max-width: 15em;
        padding: 0.5em;
        position: absolute;
        right: 20px;
        top: 20px;
        z-index: 40;
      }
    </style>
    <script src="https://js.arcgis.com/3.29/"></script>
    <script>
      var map;
      require([
        "esri/map", "esri/layers/FeatureLayer", 
        "esri/tasks/query", "esri/geometry/Circle",
        "esri/graphic", "esri/symbols/SimpleMarkerSymbol",
        "esri/symbols/SimpleLineSymbol", "esri/symbols/SimpleFillSymbol", "esri/renderers/SimpleRenderer",
        "esri/config", "esri/Color", "dojo/dom", "dojo/domReady!"
      ], function(
        Map, FeatureLayer,
        Query, Circle,
        Graphic, SimpleMarkerSymbol,
        SimpleLineSymbol, SimpleFillSymbol, SimpleRenderer,
        esriConfig, Color, dom
      ) {
        // Use a proxy page if a URL generated by this page is greater than 2000 characters
        //
        // This should not be needed as nearly all query & select functions are performed on the client
        esriConfig.defaults.io.proxyUrl = "/proxy/";

        map = new Map("mapDiv", { 
          basemap: "streets",
          center: [-95.249, 38.954],
          zoom: 14,
          slider: false
        });
        
        // Add the census block points in on demand mode. An outfield is specified since it is used when calculating   the total population falling within the one mile radius.
        var featureLayer = new FeatureLayer("https://sampleserver6.arcgisonline.com/arcgis/rest/services/Census/MapServer/0",{
          outFields: ["POP2000"],
          id: 'census'
        });

        // Selection symbol used to draw the selected census block points within the buffer polygon
        var symbol = new SimpleMarkerSymbol(
          SimpleMarkerSymbol.STYLE_CIRCLE, 
          12, 
          new SimpleLineSymbol(
            SimpleLineSymbol.STYLE_NULL, 
            new Color([247, 34, 101, 0.9]), 
            1
          ),
          new Color([207, 34, 171, 0.5])
        );
        featureLayer.setSelectionSymbol(symbol); 
        
        // Make unselected features invisible
        var nullSymbol = new SimpleMarkerSymbol().setSize(0);
        featureLayer.setRenderer(new SimpleRenderer(nullSymbol));
        
        map.addLayer(featureLayer);
        lyr = map.getLayer('census');
        console.log(lyr);
        lyr.on('selection-complete', function(){
          alert("lyr selected");
        });
        var circleSymb = new SimpleFillSymbol(
          SimpleFillSymbol.STYLE_NULL,
          new SimpleLineSymbol(
            SimpleLineSymbol.STYLE_SHORTDASHDOTDOT,
            new Color([105, 105, 105]),
            2
          ), new Color([255, 255, 0, 0.25])
        );
        var circle;

        // When the map is clicked create a buffer around the click point of the specified distance
        map.on("click", function(evt){
          circle = new Circle({
            center: evt.mapPoint,
            geodesic: true,
            radius: 1,
            radiusUnit: "esriMiles"
          });
          map.graphics.clear();
          var graphic = new Graphic(circle, circleSymb);
          map.graphics.add(graphic);

          var query = new Query();
          query.geometry = circle.getExtent();
          // Use a fast bounding box query. It will only go to the server if bounding box is outside of the visible map.
          featureLayer.queryFeatures(query, selectInBuffer);
        });

        function selectInBuffer(response){
          var feature;
          var features = response.features;
          var inBuffer = [];
          // Filter out features that are not actually in buffer, since we got all points in the buffer's bounding box
          for (var i = 0; i < features.length; i++) {
            feature = features;
            if(circle.contains(feature.geometry)){
              inBuffer.push(feature.attributes[featureLayer.objectIdField]);
            }
          }
          var query = new Query();
          query.objectIds = inBuffer;
          // Use an objectIds selection query (should not need to go to the server)
          featureLayer.selectFeatures(query, FeatureLayer.SELECTION_NEW, function(results){
            var totalPopulation = sumPopulation(results);
            var r = "";
            r = "<b>The total Census Block population within the buffer is <i>" + totalPopulation + "</i>.</b>";
            dom.byId("messages").innerHTML = r;
          });
        }
        
        function sumPopulation(features) {
          var popTotal = 0;
          for (var x = 0; x < features.length; x++) {
            popTotal = popTotal + features.attributes["POP2000"];
          }
          return popTotal;
        }
      });
    </script>
  </head>

  <body>
    <span id="messages">Click on the map to select census block points within 1 mile.</span>
    <div id="mapDiv"></div>
  </body>
</html>
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