图层要素QueryTask、FindTask查询
一. QueryTask查询
注意：只能查询单个图层。
QueryTask进行查询的地图服务并不必项加载到Map中进行显示。QueryTask的执行需要两个先决条件：一个是需要查询的图层URL、一个是进行查询的过滤条件。
@{
Layout = null;
}
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width" />
<title>title</title>
@*加载高德地图*@
<script type="text/javascript">
var dojoConfig = {
async: true,
parseOnLoad: true,
packages: [{
name: "js",
location: location.pathname.replace(/\/[^/]*$/, '') + '/js'
}]
};
</script>
<script src="~/Scripts/jquery-3.3.1.js"></script>
<script src="~/Scripts/init.js"></script>
<link href="~/Content/esri.css" rel="stylesheet" />
<link href="~/Content/tundra.css" rel="stylesheet" />
<style>
* {
margin: 0;
padding: 0;
}
html, body, #map {
width: 100%;
height: 100%;
position: absolute;
}
.list {
width: 12%;
background-color: rgba(22, 59, 90, 0.8);
color: #fff;
position: absolute;
}
select {
width: 90%;
margin: 10px 5%;
border-radius: 5px;
height: 26px;
}
</style>
<script>
var map;
//总图层
var urlMap = 'http://xxxxxx:6080/arcgis/rest/services//%E9%95%BF%E4%B8%89%E8%A7%92%E5%8C%BA%E5%9F%9F%E4%B8%80%E4%BD%93%E5%8C%9620200604/MapServer'
//图层要素图层
var ServiceAreaLine = 'http://xxxxxx:6080/arcgis/rest/services//%E9%95%BF%E4%B8%89%E8%A7%92%E5%8C%BA%E5%9F%9F%E4%B8%80%E4%BD%93%E5%8C%9620200604/MapServer/5'
require(["esri/map", "js/gaodeLayer", "esri/layers/ArcGISDynamicMapServiceLayer"],
function (Map, gaodeLayer, ArcGISDynamicMapServiceLayer) {
/* code goes here */
map = new Map("map", {
center: [120.075892, 31.526844],
zoom: 7,//缩放等级
logo: false, //logo
slider: false, //缩小按钮
});
var serverLayer = new ArcGISDynamicMapServiceLayer(urlMap, { "opacity": 0.6 });
var baselayer1 = new gaodeLayer();//默认加载矢量 new gaodeLayer({layertype:"road"});也可以
var baselayer2 = new gaodeLayer({layertype: "label"});//加载标注图
var baselayer3 = new gaodeLayer({ layertype: "st" });//加载卫星图
map.addLayer(baselayer1);//添加高德地图到map容器
map.addLayer(serverLayer);
});
</script>
</head>
<body>
<div id="map"></div>
<div class="list">
<select id="serviceArea_Select" onchange="changeServiceArea()"></select>
</div>
</body>
</html>
<script>
//将图层要素去重放入serviceArea_Select选择框中
window.onload = function () {
var queryTask = new esri.tasks.QueryTask(ServiceAreaLine);//查询的图层URL
var query = new esri.tasks.Query();
query.where = ("FID < 40000");//查询的过滤条件
query.returnGeometry = true;
query.outFields = ["*"];
queryTask.execute(query, add_serviceArea);
}
function add_serviceArea(result) {
console.log(result)
var temp = [];
var innerHtml = "";
var features = result.features;
for (var i = 0; i < features.length; i++) {
//数据去重
if (temp.indexOf(features[i].attributes.名称) == -1) {
temp.push(features[i].attributes.名称)
innerHtml += '<option>' + features[i].attributes.名称 + '</option>'
}
}
document.getElementById('serviceArea_Select').innerHTML = '<option>---请选择---</option>' + innerHtml;
}
//根据选择的图层要素进行查询定位
function changeServiceArea() {
map.graphics.clear();
var serverce_area = $('#serviceArea_Select option:selected').val();
var queryTask = new esri.tasks.QueryTask(ServiceAreaLine);//查询的图层URL
var query = new esri.tasks.Query();
query.where = ("名称 = '" + serverce_area + "'");//查询的过滤条件
query.returnGeometry = true;
query.outFields = ["*"];
queryTask.execute(query, centerServiceArea);
}
function centerServiceArea(featureSet) {
var features = featureSet.features;
for (var i = 0; i < features.length; i++) {
var graphic = features[i];
var pointX = graphic.attributes.Lng;
var pointY = graphic.attributes.Lat;
//根据要素的类型，进行设置样式
switch (graphic.geometry.type) {
case "point":
var point = new esri.geometry.Point(pointX, pointY);
var labelSymbol = new esri.symbol.PictureMarkerSymbol('/Content/ceshi.gif', 25, 25);
var marker2 = new esri.Graphic(point, labelSymbol);
map.graphics.add(marker2);
break;
case "polyline":
var symbol = new esri.symbol.SimpleLineSymbol(esri.symbol.SimpleLineSymbol.STYLE_SOLID, new dojo.Color([82, 152, 255]), 5);
break;
case "polygon":
var symbol = new esri.symbol.SimpleFillSymbol(esri.symbol.SimpleFillSymbol.STYLE_SOLID, new esri.symbol.SimpleLineSymbol(esri.symbol.SimpleLineSymbol.STYLE_DASHDOT, new dojo.Color([255, 0, 0]), 2), new dojo.Color([255, 255, 0, 0.25]));
break;
}
//设置显示样式
graphic.setSymbol(symbol);
//在地图中展示
map.graphics.add(graphic);
}
var sGeometry = graphic.geometry;
//根据要素类型缩放至地图
if (sGeometry.type == "point") {
//var hsymbol = new esri.symbol.SimpleMarkerSymbol(esri.symbol.SimpleMarkerSymbol.STYLE_SQUARE, 15, new esri.symbol.SimpleLineSymbol(esri.symbol.SimpleLineSymbol.STYLE_SOLID, new dojo.Color([0,0,255]),2), new dojo.Color([255,0,0,0.25]));
//sGrapphic.setSymbol(hsymbol);
var cPoint = new esri.geometry.Point();
cPoint.x = sGeometry.x;
cPoint.y = sGeometry.y;
map.centerAt(cPoint);
}
else {
var sExtent = sGeometry.getExtent();
map.setExtent(sExtent);
}
}
</script>
二. FindTask查询
注意：可查询单图层和跨图层数据，输入查询的图层Layers；查询的字段名字Search Fields，查询的条件 Search Text，可以查询非唯一的数据。
FindTask的url属性需要指向所查询的地图服务的REST URL，而不像QueryTask需要指定子图层的URL。
@{
Layout = null;
}
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width" />
<title>高速信息</title>
@*加载高德地图*@
<script type="text/javascript">
var dojoConfig = {
async: true,
parseOnLoad: true,
packages: [{
name: "js",
location: location.pathname.replace(/\/[^/]*$/, '') + '/js'
}]
};
</script>
<script src="~/Scripts/jquery-3.3.1.js"></script>
<script src="~/Scripts/init.js"></script>
<link href="~/Content/esri.css" rel="stylesheet" />
<link href="~/Content/tundra.css" rel="stylesheet" />
<style>
* {
margin: 0;
padding: 0;
}
html, body, #map {
width: 100%;
height: 100%;
position: absolute;
}
.list {
width: 12%;
background-color: rgba(22, 59, 90, 0.8);
color: #fff;
position: absolute;
}
input,button,select {
width: 90%;
margin: 10px 5%;
border-radius: 5px;
height: 26px;
}
</style>
<script>
var map;
var findTask, findParams, findParams2;
//总图层
var urlMap = 'http://xxxxx:6080/arcgis/rest/services//%E9%95%BF%E4%B8%89%E8%A7%92%E5%8C%BA%E5%9F%9F%E4%B8%80%E4%BD%93%E5%8C%9620200604/MapServer'
require(["esri/map", "js/gaodeLayer", "esri/layers/ArcGISDynamicMapServiceLayer", "esri/tasks/FindTask", "esri/tasks/FindParameters"],
function (Map, gaodeLayer, ArcGISDynamicMapServiceLayer, FindTask, FindParameters) {
/* code goes here */
map = new Map("map", {
center: [120.075892, 31.526844],
zoom: 7,//缩放等级
logo: false, //logo
slider: false, //缩小按钮
});
var serverLayer = new ArcGISDynamicMapServiceLayer(urlMap, { "opacity": 0.6 });
var baselayer1 = new gaodeLayer();//默认加载矢量 new gaodeLayer({layertype:"road"});也可以
var baselayer2 = new gaodeLayer({layertype: "label"});//加载标注图
var baselayer3 = new gaodeLayer({ layertype: "st" });//加载卫星图
map.addLayer(baselayer1);//添加高德地图到map容器
map.addLayer(serverLayer);
//实例化FindTask（输入查询的图层Layers）
findTask = new FindTask(urlMap);
//FindTask的参数
findParams = new FindParameters();
findParams2 = new FindParameters();
//返回Geometry
findParams.returnGeometry = true;
findParams2.returnGeometry = true;
//查询的图层id(1：站点图层)
findParams.layerIds = [2,3,4,5];
findParams2.layerIds = [0,1];
//查询的字段名字Search Fields
findParams.searchFields = ["省名称","名称"];
findParams2.searchFields = ["名称"];
});
</script>
</head>
<body>
<div id="map"></div>
<div class="list">
<input id="inputText" type="text" />
<button id="btn" onclick="execute(dojo.byId('inputText').value);">站点搜索</button>
<select id="serviceArea_Select" onchange="changeServiceArea()"></select>
</div>
</body>
</html>
<script>
//findTask查询数据
function execute(inputText) {
//inputText为搜索框的内容
findParams.searchText = inputText;
//执行
findTask.execute(findParams, add_serviceArea);
}
function add_serviceArea(result) {
console.log(result)
var temp = [];
var innerHtml = "";
for (var i = 0; i < result.length; i++) {
var feature = result[i].feature
//添加到graphics进行高亮显示
map.graphics.add(feature);;
//数据去重
if (temp.indexOf(feature.attributes.名称) == -1) {
temp.push(feature.attributes.名称)
innerHtml += '<option>' + feature.attributes.名称 + '</option>'
}
}
console.log(innerHtml)
document.getElementById('serviceArea_Select').innerHTML = '<option>---请选择---</option>' + innerHtml;
}
//根据选择的图层要素进行查询定位
function changeServiceArea() {
map.graphics.clear();
var serverce_area = $('#serviceArea_Select option:selected').val();
//查询条件
findParams.searchText = serverce_area;
//执行
findTask.execute(findParams, centerServiceArea);
}
function centerServiceArea(featureSet) {
for (var i = 0; i < featureSet.length; i++) {
var graphic = featureSet[i].feature;
var pointX = graphic.attributes.Lng;
var pointY = graphic.attributes.Lat;
//根据要素的类型，进行设置样式
switch (graphic.geometry.type) {
case "point":
var point = new esri.geometry.Point(pointX, pointY);
var labelSymbol = new esri.symbol.PictureMarkerSymbol('/Content/ceshi.gif', 25, 25);
var marker2 = new esri.Graphic(point, labelSymbol);
map.graphics.add(marker2);
break;
case "polyline":
var symbol = new esri.symbol.SimpleLineSymbol(esri.symbol.SimpleLineSymbol.STYLE_SOLID, new dojo.Color([82, 152, 255]), 5);
break;
case "polygon":
var symbol = new esri.symbol.SimpleFillSymbol(esri.symbol.SimpleFillSymbol.STYLE_SOLID, new esri.symbol.SimpleLineSymbol(esri.symbol.SimpleLineSymbol.STYLE_DASHDOT, new dojo.Color([255, 0, 0]), 2), new dojo.Color([255, 255, 0, 0.25]));
break;
}
//设置显示样式
graphic.setSymbol(symbol);
//在地图中展示
map.graphics.add(graphic);
}
var sGeometry = graphic.geometry;
//根据要素类型缩放至地图
if (sGeometry.type == "point") {
//var hsymbol = new esri.symbol.SimpleMarkerSymbol(esri.symbol.SimpleMarkerSymbol.STYLE_SQUARE, 15, new esri.symbol.SimpleLineSymbol(esri.symbol.SimpleLineSymbol.STYLE_SOLID, new dojo.Color([0,0,255]),2), new dojo.Color([255,0,0,0.25]));
//sGrapphic.setSymbol(hsymbol);
var cPoint = new esri.geometry.Point();
cPoint.x = sGeometry.x;
cPoint.y = sGeometry.y;
map.centerAt(cPoint);
}
else {
var sExtent = sGeometry.getExtent();
map.setExtent(sExtent);
}
}
</script>