Drawing with Feature Layer

JosephFedor — Thu, 16 Jan 2014 20:43:02 GMT

The person I???m designing a program for, would like a feature, he saw on a real estate website: where the user can use drawing tools to create a polygon or circle, and then markers will appear within that region for certain locations.

To accomplish that, I looked at both the Drawing Tools and the Select with Feature Layer examples.

I was able to get each example working independently (with some help from this forum), on my own server. But creating something with both together has proved to be a challenge. I took lines of code form the Feature Layer example and placed them within the Drawing tools example. But I haven???t quite achieved the desired result, yet. I can draw the shapes; but the markers don???t appear within them.

The error I get is:

TypeError: a is undefined
The resource from this URL is not text: http://js.arcgis.com/3.8/

There error comes from the last three lines of this function:
[HTML]
        function addToMap(evt) {
          var symbol;
          toolbar.deactivate();
          map.showZoomSlider();
          switch (evt.geometry.type) {
            case "point":
            case "multipoint":
              symbol = new SimpleMarkerSymbol();
              break;
            case "polyline":
              symbol = new SimpleLineSymbol();
              break;
            default:
    symbol = new SimpleFillSymbol();
     break;
          }
          var graphic = new Graphic(evt.geometry, symbol);
          map.graphics.add(graphic);

    var params = new BufferParameters();
          params.geometries = [ evt.mapPoint ];
    geometryService.buffer(params);

        }
[/HTML]

I realized it may be helpful to see this full page, I???m working on. Here it is:

[HTML]
<!DOCTYPE html>
<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
    <meta name="viewport" content="width=device-width,user-scalable=no">
    
    <meta name="viewport" content="initial-scale=1, maximum-scale=1,user-scalable=no">
    <title>Maps Toolbar</title>

    <link rel="stylesheet" href="http://js.arcgis.com/3.8/js/dojo/dijit/themes/nihilo/nihilo.css">
    <link rel="stylesheet" href="http://js.arcgis.com/3.8/js/esri/css/esri.css">
    <style>
      html, body, #mainWindow {
        font-family: sans-serif;
        height: 100%;
        width: 100%;
      }
      html, body {
        margin: 0;
        padding: 0;
      }
      #header {
        height: 80px;
        overflow: auto;
        padding: 0.5em;
      }
    </style>

    <script src="http://js.arcgis.com/3.8/"></script>
    <script type="text/javascript">
      var map, toolbar, symbol, geomTask;

      require([
        "esri/map", "esri/layers/FeatureLayer",
        "esri/tasks/query", "esri/tasks/QueryTask",
        "esri/tasks/GeometryService", "esri/tasks/BufferParameters",
        "esri/toolbars/draw",
        "esri/graphic", "esri/InfoTemplate",

        "esri/symbols/SimpleMarkerSymbol",
        "esri/symbols/SimpleLineSymbol",
        "esri/symbols/SimpleFillSymbol",
"esri/config", "dojo/_base/Color", "dojo/dom",
        "dojo/parser", "dijit/registry",

        "dijit/layout/BorderContainer", "dijit/layout/ContentPane",
        "dijit/form/Button",

"dojo/domReady!"
      ], function(
        Map, FeatureLayer,
        Query, QueryTask,
        GeometryService, BufferParameters,
Draw,
Graphic, InfoTemplate,
        SimpleMarkerSymbol, SimpleLineSymbol, SimpleFillSymbol,
esriConfig, Color, dom,
        parser, registry
      ) {
    esriConfig.defaults.io.proxyUrl = "proxy.php";
        parser.parse();

        map = new Map("map", {
          basemap: "streets",
          center: [-111.972077,41.223601],
          zoom: 14,
    slider: false
        });

        //add the census block points in selection mode. Note that an info template has been defined so when
        //selected features are clicked a popup window will appear displaying the content defined in the info template.
        var featureLayer = new FeatureLayer("http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Demographics/ESRI_Census_USA/MapServer/0",{
          mode: FeatureLayer.MODE_SELECTION,
          infoTemplate: new InfoTemplate("Block: ${BLOCK}", "${*}"),
          outFields: ["POP2000","HOUSEHOLDS","HSE_UNITS", "TRACT", "BLOCK"]
        });

        // 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);
        map.addLayer(featureLayer);

        // geometry service that will be used to perform the buffer
        var geometryService = new GeometryService("http://tasks.arcgisonline.com/ArcGIS/rest/services/Geometry/GeometryServer");

geometryService.on("buffer-complete", function(result)
{
          map.graphics.clear();
          // draw the buffer geometry on the map as a map graphic
          var symbol = new SimpleFillSymbol(
            SimpleFillSymbol.STYLE_NULL,
            new SimpleLineSymbol(
              SimpleLineSymbol.STYLE_SHORTDASHDOTDOT,
              new Color([105,105,105]),
              2
            ),new Color([255,255,0,0.25])
          );
          var bufferGeometry = result.geometries[0]
          var graphic = new Graphic(bufferGeometry, symbol);
          map.graphics.add(graphic);

          //Select features within the buffered polygon. To do so we'll create a query to use the buffer graphic
          //as the selection geometry.
          var query = new Query();
          query.geometry = bufferGeometry;
          featureLayer.selectFeatures(query, FeatureLayer.SELECTION_NEW, function(results)
    {});
        });



     map.on("load", createToolbar);

        // loop through all dijits, connect onClick event
        // listeners for buttons to activate drawing tools
        registry.forEach(function(d) {
          // d is a reference to a dijit
          // could be a layout container or a button
          if ( d.declaredClass === "dijit.form.Button" ) {
            d.on("click", activateTool);
          }
        });

        function activateTool() {
          var tool = this.label.toUpperCase().replace(/ /g, "_");
          toolbar.activate(Draw[tool]);
          map.hideZoomSlider();
        }

        function createToolbar(themap) {
          toolbar = new Draw(map);
          toolbar.on("draw-end", addToMap);
        }

        function addToMap(evt) {
          var symbol;
          toolbar.deactivate();
          map.showZoomSlider();
          switch (evt.geometry.type) {
            case "point":
            case "multipoint":
              symbol = new SimpleMarkerSymbol();
              break;
            case "polyline":
              symbol = new SimpleLineSymbol();
              break;
            default:
    symbol = new SimpleFillSymbol();
     break;
          }
          var graphic = new Graphic(evt.geometry, symbol);
          map.graphics.add(graphic);

    var params = new BufferParameters();
          params.geometries = [ evt.mapPoint ];
    geometryService.buffer(params);

        }
      });
    </script>
</head>
<body class="nihilo">

<div id="mainWindow" data-dojo-type="dijit/layout/BorderContainer" data-dojo-props="design:'headline'">
    <div id="header" data-dojo-type="dijit/layout/ContentPane" data-dojo-props="region:'top'">
      <table width="100%" border="0" cellspacing="0" cellpadding="0">
           <tr>
             <td>
                   <span>Draw:<br /></span>
      <button data-dojo-type="dijit/form/Button">Polygon</button>
      <button data-dojo-type="dijit/form/Button">Freehand Polygon</button>
      
      <button data-dojo-type="dijit/form/Button">Circle</button>
      <button data-dojo-type="dijit/form/Button">Ellipse</button>
             </td>
             <td><p align="right"><a href="commercial_home.php"><img src="image/home.jpg" width="40" height="32" alt="Home" title="Home"></a>    <a href="logout.php"><img src="image/exit.png" width="40" height="32" alt="Exit" title="Exit"></a>    </p></td>
            </tr>
            </table>
    </div>
    <div id="map" data-dojo-type="dijit/layout/ContentPane" data-dojo-props="region:'center'"></div>
</div>

</body>
</html>
[/HTML]

Thanks,
jfedor

Re: Drawing with Feature Layer

RobertScheitlin__GISP — Thu, 16 Jan 2014 21:35:11 GMT

Joseph,

The evt has a geometry but does not have mapPoint so shouldn't you be doing:

params.geometries  = [ evt.geometry ];

Re: Drawing with Feature Layer

JakeSkinner — Fri, 17 Jan 2014 12:30:49 GMT

Hi Joseph,

To build off Robert's suggestion, you will also need to add the parameter distances and unit properties.

var params = new BufferParameters(); params.geometries  = [ evt.geometry]; params.distances = [ 1 ]; params.unit = GeometryService.UNIT_STATUTE_MILE; geometryService.buffer(params);

Re: Drawing with Feature Layer

JosephFedor — Fri, 17 Jan 2014 14:18:51 GMT

You both are awesome, thank you so much.

Robert I copied your code verbatim and it works! The dots appear inside the area. (The area would grow at first after I drew the polygon, so I adjusted the params distance to 0.01, instead of 1.) It works perfect now; just like I thought it should.

Thanks so very much,
jfedor

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