ArcGIS Javascript API: Feature selection using graphics

HabG_ · ‎09-29-2014

Hi All,

I have a web map similar to the one in the code below. There are various option to draw a graphic and select the features inside the polygon. The style of my web map is organised in such away that, where the map is in the center and other functions such as legend in the right pane. However, when I move the graphic buttons to the right pane, the graphic polygon drawing and selection of features is not working. Am I missing something? anyone who can help me fix this, please paste the correct code if you can. Thanks.


<!DOCTYPE html>  
<html>  
  <head>  
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">  
  
    <!--The viewport meta tag is used to improve the presentation and behavior of the samples   
      on iOS devices-->  
    <meta name="viewport" content="initial-scale=1, maximum-scale=1,user-scalable=no">  
    <title>Shapes and Symbols</title>  
  
    <link rel="stylesheet" href="http://js.arcgis.com/3.10/js/esri/css/esri.css">  
  
    <style>  
      #info {  
        top: 20px;  
        color: #444;  
        height: auto;  
        font-family: arial;  
        right: 20px;  
        margin: 5px;  
        padding: 10px;  
        position: absolute;  
        width: 115px;  
        z-index: 40;  
        border: solid 2px #666;  
        border-radius: 4px;  
        background-color: #fff;  
      }  
      html, body, #mapDiv {  
        padding:0;  
        margin:0;  
        height:100%;  
      }  
      button {  
        display: block;  
      }  
    </style>  
  
    <script src="http://js.arcgis.com/3.10/"></script>  
    <script>  
      var map, tb;  
  
      require([  
        "esri/map", "esri/toolbars/draw", "dojo/promise/all",  
        "esri/symbols/SimpleMarkerSymbol", "esri/symbols/SimpleLineSymbol", "esri/symbols/SimpleFillSymbol",  
        "esri/symbols/PictureFillSymbol", "esri/symbols/CartographicLineSymbol", "esri/layers/FeatureLayer",   
        "esri/graphic", "esri/tasks/query", "esri/tasks/QueryTask", "esri/InfoTemplate",  
        "esri/Color", "dojo/dom", "dojo/on", "dojo/domReady!"  
      ], function(  
        Map, Draw, All,  
        SimpleMarkerSymbol, SimpleLineSymbol, SimpleFillSymbol,  
        PictureFillSymbol, CartographicLineSymbol, FeatureLayer,  
        Graphic, Query, QueryTask, InfoTemplate,  
        Color, dom, on  
      ) {  
        map = new Map("mapDiv", {  
          basemap: "streets",  
          center: [-85.82966, 33.666494],  
          zoom: 13  
        });  
        map.on("load", initToolbar);  
          
        var featureLayer1 = new FeatureLayer("http://sampleserver6.arcgisonline.com/arcgis/rest/services/Census/MapServer/0",{  
          mode: FeatureLayer.MODE_SELECTION,  
          infoTemplate: new InfoTemplate("Block: ${BLOCK}", "${*}"),  
          outFields: ["POP2000","HOUSEHOLDS","HSE_UNITS", "TRACT", "BLOCK"]  
        });  
          
        var featureLayer2 = new FeatureLayer("http://sampleserver6.arcgisonline.com/arcgis/rest/services/Census/MapServer/1",{  
          mode: FeatureLayer.MODE_SELECTION,  
          infoTemplate: new InfoTemplate("Block Group: ${BLKGRP}", "${*}"),  
          outFields: ["POP2000","HOUSEHOLDS","HSE_UNITS", "TRACT", "BLKGRP"]  
        });  
          
        var featureLayer3 = new FeatureLayer("http://sampleserver6.arcgisonline.com/arcgis/rest/services/Census/MapServer/2",{  
          mode: FeatureLayer.MODE_SELECTION,  
          infoTemplate: new InfoTemplate("County Name: ${NAME}", "${*}"),  
          outFields: ["POP2000","HOUSEHOLDS","HSE_UNITS","NAME"]  
        });  
          
        map.addLayers([featureLayer1, featureLayer2, featureLayer3]);  
  
        // markerSymbol is used for point and multipoint, see http://raphaeljs.com/icons/#talkq for more examples  
        var markerSymbol = new SimpleMarkerSymbol();  
        markerSymbol.setPath("M16,4.938c-7.732,0-14,4.701-14,10.5c0,1.981,0.741,3.833,2.016,5.414L2,25.272l5.613-1.44c2.339,1.316,5.237,2.106,8.387,2.106c7.732,0,14-4.701,14-10.5S23.732,4.938,16,4.938zM16.868,21.375h-1.969v-1.889h1.969V21.375zM16.772,18.094h-1.777l-0.176-8.083h2.113L16.772,18.094z");  
        markerSymbol.setColor(new Color("#00FFFF"));  
  
        // lineSymbol used for freehand polyline, polyline and line.   
        var lineSymbol = new CartographicLineSymbol(  
          CartographicLineSymbol.STYLE_SOLID,  
          new Color([255,0,0]), 10,   
          CartographicLineSymbol.CAP_ROUND,  
          CartographicLineSymbol.JOIN_MITER, 5  
        );  
  
        // fill symbol used for extent, polygon and freehand polygon  
        var fillSymbol = new SimpleFillSymbol();  
  
        function initToolbar() {  
          tb = new Draw(map);  
          tb.on("draw-end", addGraphic);  
  
          // event delegation so a click handler is not  
          // needed for each individual button  
          on(dom.byId("info"), "click", function(evt) {  
            if ( evt.target.id === "info" ) {  
              return;  
            }  
            var tool = evt.target.id.toLowerCase();  
            map.disableMapNavigation();  
            tb.activate(tool);  
          });  
        }  
  
        function addGraphic(evt) {  
          //deactivate the toolbar and clear existing graphics   
          tb.deactivate();   
          map.enableMapNavigation();  
  
          // figure out which symbol to use  
          var symbol;  
          if ( evt.geometry.type === "point" || evt.geometry.type === "multipoint") {  
            symbol = markerSymbol;  
          } else if ( evt.geometry.type === "line" || evt.geometry.type === "polyline") {  
            symbol = lineSymbol;  
          }  
          else {  
            symbol = fillSymbol;  
          }  
  
          map.graphics.add(new Graphic(evt.geometry, symbol));  
          queryMapService(evt.geometry);  
        }  
          
        function queryMapService(Geom){  
          var promises = [];  
            
          var query = new Query();  
          query.returnGeometry = false;     
          query.outFields = ["*"];     
          query.geometry = Geom;  
          promises.push(featureLayer1.selectFeatures(query, FeatureLayer.SELECTION_NEW));  
          promises.push(featureLayer2.selectFeatures(query, FeatureLayer.SELECTION_NEW));  
          promises.push(featureLayer3.selectFeatures(query, FeatureLayer.SELECTION_NEW));  
          var allPromises = new All(promises);  
          allPromises.then(function (r) { showResults(r); });  
        }  
          
        function showResults(results) {  
          var resultCount = results.length;  
          console.log(resultCount);  
        }  
      });  
    </script>  
  </head>  
    
  <body>  
      
    <div id="info">  
      <div>Select a shape then draw on map to add graphic</div>  
      <button id="Point">Point</button>  
      <button id="Multipoint">Multipoint</button>  
      <button id="Line">Line</button>  
      <button id="Polyline">Polyline</button>  
      <button id="FreehandPolyline">Freehand Polyline</button>  
      <button id="Triangle">Triangle</button>  
      <button id="Extent">Rectangle</button>  
      <button id="Circle">Circle</button>  
      <button id="Ellipse">Ellipse</button>  
      <button id="Polygon">Polygon</button>  
      <button id="FreehandPolygon">Freehand Polygon</button>  
    </div>  
  
    <div id="mapDiv"></div>  
  
  </body>  
</html>

JakeSkinner · ‎09-29-2014

Hi Hab,

This should work once you add the graphic buttons to a side panel. You will want to make sure you are calling the dijit modules and dojo/parser. Take a look at the following example here.

View solution in original post

JakeSkinner · ‎09-29-2014

Hi Hab,

This should work once you add the graphic buttons to a side panel. You will want to make sure you are calling the dijit modules and dojo/parser. Take a look at the following example here.

HabG_ · ‎09-29-2014

Thanks Jake.

RichardMoussopo · ‎01-11-2015

This is very handy,

Thank you Jake