图形查询属性（IdentifyTask实现查询）//查询本地服务
主页代码：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>图形查询属性</title>
<link rel="stylesheet" href="http://js.arcgis.com/3.9/js/dojo/dijit/themes/claro/claro.css">
<link rel="stylesheet" href="http://js.arcgis.com/3.9/js/esri/css/esri.css">
<script src="http://js.arcgis.com/3.9/"></script>
<script src="Identify.js"></script>
</head>
<body class="claro">
<button data-dojo-type="dijit/form/Button">点</button>
<button data-dojo-type="dijit/form/Button">线</button>
<button data-dojo-type="dijit/form/Button">多边形</button>
<div id="mapDiv" style="width:900px; height:600px; border:1px solid #000;"></div> <!-- info window tabs -->
<div id="tabs" data-dojo-type="dijit/layout/TabContainer" style="width:385px;height:150px;">
<div id="layer2Tab" data-dojo-type="dijit/layout/ContentPane" title="州"></div>
<div id="layer1Tab" data-dojo-type="dijit/layout/ContentPane" title="河流"></div>
<div id="layer0Tab" data-dojo-type="dijit/layout/ContentPane" title="城市"></div>
</div>
</body>
</html>
Identify.js代码：
var map, identifyTask, identifyParams;
var pointSym, lineSym, polygonSym;
var layer2results, layer1results, layer0results; require(["dojo/parser", "dijit/registry", "esri/map", "esri/layers/ArcGISDynamicMapServiceLayer", "esri/toolbars/draw",
"esri/symbols/SimpleMarkerSymbol", "esri/symbols/SimpleLineSymbol", "esri/symbols/SimpleFillSymbol", "esri/Color",
"esri/tasks/IdentifyTask", "esri/tasks/IdentifyParameters", "esri/geometry/screenUtils",
"dijit/form/Button", "dijit/layout/TabContainer", "dijit/layout/ContentPane", "dojo/domReady!"],
function (parser, registry, Map, ArcGISDynamicMapServiceLayer, Draw,
SimpleMarkerSymbol, SimpleLineSymbol, SimpleFillSymbol, Color,
IdentifyTask, IdentifyParameters, screenUtils) { parser.parse(); map = new Map("mapDiv");
//var url = "http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Specialty/ESRI_StatesCitiesRivers_USA/MapServer";
var url = "http://localhost:6080/arcgis/rest/services/bluechina/MapServer";
var agoLayer = new ArcGISDynamicMapServiceLayer(url);
map.addLayer(agoLayer);
map.on("load", initIdentify); var redColor = new Color([255, 0, 0]);
var halfFillYellow = new Color([255, 255, 0, 0.5]);
pointSym = new SimpleMarkerSymbol(SimpleMarkerSymbol.STYLE_DIAMOND, 10,
new SimpleLineSymbol(SimpleLineSymbol.STYLE_SOLID, redColor, 1),
halfFillYellow);
lineSym = new SimpleLineSymbol(SimpleLineSymbol.STYLE_DASHDOT, redColor, 2);
polygonSym = new SimpleFillSymbol(SimpleFillSymbol.STYLE_SOLID,
new SimpleLineSymbol(SimpleLineSymbol.STYLE_SOLID, redColor, 2),
halfFillYellow); map.infoWindow.on("show", function () {
registry.byId("tabs").resize();
}); var tb = new Draw(map);
tb.on("draw-end", doIdentify); registry.forEach(function (d) {
if (d.declaredClass === "dijit.form.Button") {
d.on("click", activateTool);
}
}); function activateTool() {
var tool = null;
switch (this.label) {
case "点":
tool = "POINT";
break;
case "线":
tool = "POLYLINE";
break;
case "多边形":
tool = "POLYGON";
break;
}
tb.activate(Draw[tool]);
map.hideZoomSlider();
} function initIdentify(evt) {
// 实例化IdentifyTask
identifyTask = new IdentifyTask(url);
// IdentifyTask参数设置
identifyParams = new IdentifyParameters();
// 冗余范围
identifyParams.tolerance = 3;
// 返回地理元素
identifyParams.returnGeometry = true;
// 进行Identify的图层
identifyParams.layerIds = [2, 1, 0];
// 进行Identify的图层为全部
identifyParams.layerOption = IdentifyParameters.LAYER_OPTION_ALL; // 设置infoWindow的大小
evt.map.infoWindow.resize(415, 200);
// 设置infoWindow的标题头
evt.map.infoWindow.setTitle("Identify结果");
evt.map.infoWindow.setContent(registry.byId("tabs").domNode);
} // 进行Identify
function doIdentify(evt) {
// 清除上一次的高亮显示
map.graphics.clear();
// Identify的geometry
identifyParams.geometry = evt.geometry;
// Identify范围
identifyParams.mapExtent = map.extent;
identifyTask.execute(identifyParams, function (idResults) {
addToMap(idResults, evt.geometry);
});
} // 在infoWindow中显示Identify结果
function addToMap(idResults, geometry) {
layer2results = { displayFieldName: null, features: [] };
layer1results = { displayFieldName: null, features: [] };
layer0results = { displayFieldName: null, features: [] };
for (var i = 0, il = idResults.length; i < il; i++) {
var idResult = idResults[i];
if (idResult.layerId === 2) {
if (!layer2results.displayFieldName) {
layer2results.displayFieldName = idResult.displayFieldName;
}
layer2results.features.push(idResult.feature);
} else if (idResult.layerId === 1) {
if (!layer1results.displayFieldName) {
layer1results.displayFieldName = idResult.displayFieldName;
}
layer1results.features.push(idResult.feature);
} else if (idResult.layerId === 0) {
if (!layer0results.displayFieldName) {
layer0results.displayFieldName = idResult.displayFieldName;
}
layer0results.features.push(idResult.feature);
}
}
registry.byId("layer2Tab").setContent(layerTabContent(layer2results, "layer2results"));
registry.byId("layer1Tab").setContent(layerTabContent(layer1results, "layer1results"));
registry.byId("layer0Tab").setContent(layerTabContent(layer0results, "layer0results")); // 设置infoWindow显示
var firstPt;
if (geometry.type == "point")
firstPt = geometry;
else
firstPt = geometry.getPoint(0, 0);
var screenPoint = screenUtils.toScreenPoint(map.extent, map.width, map.height, firstPt);
map.infoWindow.show(screenPoint, map.getInfoWindowAnchor(screenPoint));
} function layerTabContent(layerResults, layerName) {
var content = "<i>选中要素数目为：" + layerResults.features.length + "</i>";
switch (layerName) {
case "layer2results":
content += "<table border='1'><tr><th>ID</th><th>州名</th><th>面积</th></tr>";
for (var i = 0, il = layerResults.features.length; i < il; i++) {
content += "<tr><td>" + layerResults.features[i].attributes['FID'] + " <a href='#' onclick='showFeature(" + layerName + ".features[" + i + "]); return false;'>(显示)</a></td>";
content += "<td>" + layerResults.features[i].attributes['NAME'] + "</td>";
content += "<td>" + layerResults.features[i].attributes['AREA'] + "</td>";
}
content += "</tr></table>";
break;
case "layer1results":
content += "<table border='1'><tr><th>ID</th><th>名称</th></tr>";
for (var i = 0, il = layerResults.features.length; i < il; i++) {
content += "<tr><td>" + layerResults.features[i].attributes['FID'] + " <a href='#' onclick='showFeature(" + layerName + ".features[" + i + "]); return false;'>(显示)</a></td>";
content += "<td>" + layerResults.features[i].attributes['NAME'] + "</td>";
}
content += "</tr></table>";
break;
case "layer0results":
content += "<table border='1'><tr><th>ID</th><th>形状</th><th>省名</th><th>面积</th></tr>";
for (var i = 0, il = layerResults.features.length; i < il; i++) {
content += "<tr><td>" + layerResults.features[i].attributes['FID'] + " <a href='#' onclick='showFeature(" + layerName + ".features[" + i + "]); return false;'>(显示)</a></td>";
content += "<td>" + layerResults.features[i].attributes['Shape'] + "</td>";
content += "<td>" + layerResults.features[i].attributes['NAME'] + "</td>";
content += "<td>" + layerResults.features[i].attributes['AREA'] + "</td>";
}
content += "</tr></table>";
break;
}
return content;
}
}); // 高亮显示选中元素
function showFeature(feature) {
map.graphics.clear();
var symbol;
// 将几何对象加入到地图中
switch (feature.geometry.type) {
case "point":
symbol = pointSym;
break;
case "polyline":
symbol = lineSym;
break;
case "polygon":
symbol = polygonSym;
break;
} feature.setSymbol(symbol);
map.graphics.add(feature);
}
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