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Graphic position within map.graphics

TimWitt2

Hey everybody,

I was wondering if there is a way to retrieve the position of a particular graphic within the map.graphics layer.

Lets say I use the draw tool and add 3 arrows to my map. The first arrow I created is number 1, the second one is number 2 and the third is number 3. Depending over which of the 3 arrows I hover I would like to know which number it is within the map.graphics layer.

Is this possible?

Thanks,

Tim

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Accepted answers

RobertScheitlin__GISP

Tim,

There seems to always be one graphic in the map.graphics array but you definitely can count the graphics creation order.

<!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",
        "esri/symbols/SimpleMarkerSymbol", "esri/symbols/SimpleLineSymbol",
        "esri/symbols/SimpleFillSymbol", "esri/symbols/CartographicLineSymbol", 
        "esri/graphic", 
        "esri/Color", "dojo/dom", "dojo/on", "dojo/domReady!"
      ], function(
        Map, Draw,
        SimpleMarkerSymbol, SimpleLineSymbol,
        SimpleFillSymbol, CartographicLineSymbol, 
        Graphic, 
        Color, dom, on
      ) {
        map = new Map("mapDiv", {
          basemap: "streets",
          center: [-25.312, 34.307],
          zoom: 3
        });
        map.on("load", initToolbar);

        // 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(SimpleFillSymbol.STYLE_SOLID,
          new SimpleLineSymbol(
            SimpleLineSymbol.STYLE_SOLID,
              new Color('#000'), 
              1
            ), 
            new Color('#ff0000')
        );

        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);
          });
          
          map.graphics.enableMouseEvents();
          map.graphics.on("mouse-over", identifyGraphic);
        }
        
        function identifyGraphic(evt) {
          var cnt = -1;
          dojo.forEach(map.graphics.graphics, function(graphicf) {
              cnt += 1;
              if (graphicf == evt.graphic) {
                  console.log("Hovered Graphic ID is :" + cnt.toString());
                  return;
              }
          });
        }

        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));
        }
      });
    </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>