Here's the full app:
<!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>QueryTask with geometry, results as an InfoWindow onHover</title>
<link rel="stylesheet" href="http://js.arcgis.com/3.14/dijit/themes/claro/claro.css">
<link rel="stylesheet" href="http://js.arcgis.com/3.14/esri/css/esri.css">
<script src="http://js.arcgis.com/3.14/"></script>
<script>
var map;
require([
"esri/map",
"esri/graphic",
"esri/InfoTemplate",
"esri/SpatialReference",
"esri/geometry/Extent",
"esri/layers/GraphicsLayer",
"esri/symbols/SimpleFillSymbol",
"esri/symbols/SimpleLineSymbol",
"esri/tasks/query",
"esri/tasks/QueryTask",
"esri/Color",
"dojo/domReady!"
],
function (
Map, Graphic, InfoTemplate, SpatialReference, Extent, GraphicsLayer,
SimpleFillSymbol, SimpleLineSymbol, Query, QueryTask, Color
) {
map = new Map("mapDiv", {
basemap: "streets",
center: [-80.94, 33.646],
zoom: 8
});
map.on("load", setUpQuery);
function setUpQuery () {
//set-up listener for county layer click event
dojo.connect(map.graphics,"onClick",identifyFeatures);
function identifyFeatures(evt){
var extent = evt.graphic.geometry.getExtent();
map.setExtent(extent);
}
var queryTask = new QueryTask("http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Demographics/ESRI_Census_USA/MapServer/3");
//build query filter
var query = new Query();
query.returnGeometry = true;
query.outFields = ["NAME", "POP2000", "POP2007", "POP00_SQMI", "POP07_SQMI"];
query.outSpatialReference = { "wkid": 102100 };
query.where = "STATE_NAME = 'South Carolina'";
var infoTemplate = new InfoTemplate();
var content = "<b>2000 Population: </b>${POP2000}<br/>" +
"<b>2000 Population per Sq. Mi.: </b>${POP00_SQMI}<br/>" +
"<b>2007 Population: </b>${POP2007}<br/>" +
"<b>2007 Population per Sq. Mi.: </b>${POP07_SQMI}";
infoTemplate.setTitle("${NAME}");
infoTemplate.setContent(content);
map.infoWindow.resize(245, 125);
//Can listen for complete event to process results
//or can use the callback option in the queryTask.execute method.
queryTask.on("complete", function (event) {
map.graphics.clear();
var highlightSymbol = new SimpleFillSymbol(SimpleFillSymbol.STYLE_SOLID,
new SimpleLineSymbol(SimpleLineSymbol.STYLE_SOLID,
new Color([255, 0, 0]), 3), new Color([125, 125, 125, 0.35]));
var symbol = new SimpleFillSymbol(SimpleFillSymbol.STYLE_SOLID,
new SimpleLineSymbol(SimpleLineSymbol.STYLE_SOLID,
new Color([255, 255, 255, 0.35]), 1), new Color([125, 125, 125, 0.35]));
var features = event.featureSet.features;
var countiesGraphicsLayer = new GraphicsLayer();
//QueryTask returns a featureSet.
//Loop through features in the featureSet and add them to the map.
var featureCount = features.length;
for (var i = 0; i < featureCount; i++) {
//Get the current feature from the featureSet.
var graphic = features; //Feature is a graphic
graphic.setSymbol(symbol);
graphic.setInfoTemplate(infoTemplate);
countiesGraphicsLayer.add(graphic);
}
map.addLayer(countiesGraphicsLayer);
map.graphics.enableMouseEvents();
//listen for when the mouse-over event fires on the countiesGraphicsLayer
//when fired, create a new graphic with the geometry from event.graphic
//and add it to the maps graphics layer
countiesGraphicsLayer.on("mouse-over",function (event) {
map.graphics.clear(); //use the maps graphics layer as the highlight layer
var graphic = event.graphic;
map.infoWindow.setContent(graphic.getContent());
map.infoWindow.setTitle(graphic.getTitle());
var highlightGraphic = new Graphic(graphic.geometry, highlightSymbol);
map.graphics.add(highlightGraphic);
//uncomment below to show infoWindow contents
//map.infoWindow.show(event.screenPoint,
//map.getInfoWindowAnchor(event.screenPoint));
});
//listen for when map.graphics mouse-out event is fired
//and then clear the highlight graphic
//and hide the info window
map.graphics.on("mouse-out", function () {
map.graphics.clear();
map.infoWindow.hide();
});
});
queryTask.execute(query);
}
});
</script>
</head>
<body class="claro">
Hover over a county in South Carolina to get more information.
<div id="mapDiv" style="width:900px; height:600px; border:1px solid #000;"></div>
</body>
</html>If you are unfamiliar with the API, I would start here:
Build your first application | Guide | ArcGIS API for JavaScript
