如何正确响应ArcGIS JavaScript API中图形的鼠标事件
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在使用ArcGIS JavaScript API编写程序的时候，程序员往往需要完成这样一个功能：点击地图上的图形，自动进行专题GIS数据查询，当在地图非图形区域上点击时，自动进行底图兴趣点查询。
由于专题GIS图形是叠加在底图上的，所以我们在处理地图的鼠标点击事件时，就需要根据实际点击的位置和内容来对不同的数据进行查询。
ArcGIS JavaScript API为编程人员分别提供了针对地图对象和图形的两个鼠标点击事件。
下面是示例代码：
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="viewport" content="initial-scale=1, maximum-scale=1,user-scalable=no" />
<title>Test Map</title>
<link rel="stylesheet" href="/arcgis_js_api/library/3.17/3.17/dijit/themes/claro/claro.css" />
<link rel="stylesheet" href="/arcgis_js_api/library/3.17/3.17/esri/css/esri.css" />
<style>
html, body, #ui-map-view {
margin: 0;
padding: 0;
width: 100%;
height: 100%;
}
</style>
<script src="/arcgis_js_api/library/3.17/3.17/init.js"></script>
<script>
var myMap;
require([
"esri/layers/ArcGISTiledMapServiceLayer",
"esri/symbols/SimpleMarkerSymbol",
"esri/map",
"dojo/on",
"esri/graphic",
"esri/geometry/Point",
"dojo/domReady!"
], function ( TileLayer,SimpleMarkerSymbol, Map, on,Graphic,Point){
var layer = new TileLayer(
"/ags/rest/services/WorldBaseMap/MapServer"
);
myMap = new Map("ui-map-view",{
center: [-111.87, 40.57]
});
myMap.addLayer(layer);
//地图鼠标点击响应事件
on(myMap,"click",function(e){
alert("map clicked");
});
myMap.on("load", function() {//图形鼠标点击响应事件
myMap.graphics.on("click",function(e){
alert("graphic clicked");
e.stopPropagation();
});
var g=new Graphic();
g.setGeometry(new Point([-111.87, 40.57]));
var simpleMarkerSymbol = new SimpleMarkerSymbol();
g.setSymbol(simpleMarkerSymbol);
myMap.graphics.add(g);
});
});
</script>
</head>
<body class="claro">
<div id="ui-map-view"></div>
</body>
</html>
由于专题GIS图形是叠加在底图上的，所以我们在处理地图的鼠标点击事件时，就需要根据实际点击的位置和内容来对不同的数据进行查询。
ArcGIS JavaScript API为编程人员分别提供了针对地图对象和图形的两个鼠标点击事件。
下面是示例代码：
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="viewport" content="initial-scale=1, maximum-scale=1,user-scalable=no" />
<title>Test Map</title>
<link rel="stylesheet" href="/arcgis_js_api/library/3.17/3.17/dijit/themes/claro/claro.css" />
<link rel="stylesheet" href="/arcgis_js_api/library/3.17/3.17/esri/css/esri.css" />
<style>
html, body, #ui-map-view {
margin: 0;
padding: 0;
width: 100%;
height: 100%;
}
</style>
<script src="/arcgis_js_api/library/3.17/3.17/init.js"></script>
<script>
var myMap;
require([
"esri/layers/ArcGISTiledMapServiceLayer",
"esri/symbols/SimpleMarkerSymbol",
"esri/map",
"dojo/on",
"esri/graphic",
"esri/geometry/Point",
"dojo/domReady!"
], function ( TileLayer,SimpleMarkerSymbol, Map, on,Graphic,Point){
var layer = new TileLayer(
"/ags/rest/services/WorldBaseMap/MapServer"
);
myMap = new Map("ui-map-view",{
center: [-111.87, 40.57]
});
myMap.addLayer(layer);
//地图鼠标点击响应事件
on(myMap,"click",function(e){
alert("map clicked");
});
myMap.on("load", function() {//图形鼠标点击响应事件
myMap.graphics.on("click",function(e){
alert("graphic clicked");
e.stopPropagation();
});
var g=new Graphic();
g.setGeometry(new Point([-111.87, 40.57]));
var simpleMarkerSymbol = new SimpleMarkerSymbol();
g.setSymbol(simpleMarkerSymbol);
myMap.graphics.add(g);
});
});
</script>
</head>
<body class="claro">
<div id="ui-map-view"></div>
</body>
</html>
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