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>
