What's the spatial reference of your map? If it is web mercator you'll need to convert the lat/lon location from geographic to web mercator. You can do this using the utility method esri.geometry.geographicToWebMercator. Here's some test code that shows how this works, if I run this code using the following url param the map should zoom to New York http://localhost/forum/zoomloc.html?location=-74.00,40.71
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=7,IE=9" />
<!--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> World Street Map</title>
<link rel="stylesheet" type="text/css" href="http://serverapi.arcgisonline.com/jsapi/arcgis/3.2/js/dojo/dijit/themes/claro/claro.css">
<link rel="stylesheet" type="text/css" href="http://serverapi.arcgisonline.com/jsapi/arcgis/3.2/js/esri/css/esri.css" />
<style>
html,body,#map,.map.container{
padding:0;
margin:0;
height:100%;
}
</style>
<script type="text/javascript">var djConfig = {parseOnLoad: true};</script>
<script type="text/javascript" src="http://serverapi.arcgisonline.com/jsapi/arcgis/?v=3.2"></script>
<script type="text/javascript">
dojo.require("esri.map");
var map;
function init() {
map = new esri.Map("map");
//Add the world street map layer to the map. View the ArcGIS Online site for services http://arcgisonline/home/search.html?t=content&f=typekeywords:service
var basemap = new esri.layers.ArcGISTiledMapServiceLayer("http://server.arcgisonline.com/ArcGIS/rest/services/World_Street_Map/MapServer");
map.addLayer(basemap);
dojo.connect(map, 'onLoad', function(theMap) {
//get lon/lat from url
var url = window.location.href;
var urlObject = esri.urlToObject(url);
if (urlObject.query) {
var location = urlObject.query.location || '';
if(location){
var vals = location.split(",");
zoomToLocation(dojo.number.parse(vals[0]), dojo.number.parse(vals[1]));
}
}
//resize the map when the browser resizes
dojo.connect(window, 'resize', map,map.resize);
});
}
function zoomToLocation(lon,lat){
//convert point from geographic to web mercator since the map is in web mercator
var point = new esri.geometry.Point(lon,lat, new esri.SpatialReference({ wkid: 4326 }));
var wmpoint = esri.geometry.geographicToWebMercator(point);
//add the graphic to the map
var symbol = new esri.symbol.SimpleMarkerSymbol().setColor(new dojo.Color([0, 255, 0]));
symbol.setSize(8);
var graphic = new esri.Graphic(wmpoint,symbol);
map.graphics.add(graphic);
//zoom to the location
var factor = 1;
var zoomExtent = new esri.geometry.Extent(
wmpoint.x - factor,
wmpoint.y - factor,
wmpoint.x + factor,
wmpoint.y + factor,
wmpoint.SpatialReference
);
map.setExtent(zoomExtent.expand(2));
}
dojo.addOnLoad(init);
</script>
</head>
<body class="claro">
<div id="map">
</div>
</body>
</html>
