<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="initial-scale=1, maximum-scale=1, user-scalable=no">
<title></title>
<link rel="stylesheet" href="http://js.arcgis.com/3.13/esri/css/esri.css">
<style>
html, body, #map {
height: 100%;
width: 100%;
margin: 0;
padding: 0;
}
#search {
display: block;
position: absolute;
z-index: 3;
top: 20px;
left: 75px;
}
.spotlight {
z-index:-1;
position:absolute;
left:50%;
top:50%;
border-radius:50%;
opacity:0;
box-shadow:
inset rgba(0,0,0,0.25) 0px 0px 20px 20px,
rgba(0,0,0,0.25) 0px 0px 0px 1000px;
transition:all 1000ms;
-moz-transition:all 1000ms;
-webkit-transition:all 1000ms;
}
.spotlight-active {
z-index:2;
opacity:1;
}
</style>
<script src="http://js.arcgis.com/3.13/"></script>
<script>
require([
"esri/map",
"esri/dijit/Geocoder",
"esri/graphic",
"esri/symbols/SimpleMarkerSymbol",
"esri/geometry/screenUtils",
"dojo/dom",
"dojo/dom-construct",
"dojo/query",
"dojo/_base/Color",
"dojo/domReady!"
], function(Map, Geocoder, Graphic, SimpleMarkerSymbol, screenUtils, dom, domConstruct, query, Color) {
// create a map and instance of the geocoder widget here
var map = new Map("map", {
basemap: "topo",
center: [ -100, 40 ],
zoom: 10
});
var geocoder = new Geocoder({
arcgisGeocoder: {
placeholder: "Find a place"
},
autoComplete: true,
map: map
}, dom.byId("search"));
map.on("load", enableSpotlight);
geocoder.on("select", showLocation);
geocoder.on("clear", removeSpotlight);
function showLocation(evt) {
map.graphics.clear();
var point = evt.result.feature.geometry;
var symbol = new SimpleMarkerSymbol().setStyle(
SimpleMarkerSymbol.STYLE_SQUARE).setColor(
new Color([255,0,0,0.5])
);
var graphic = new Graphic(point, symbol);
map.graphics.add(graphic);
map.infoWindow.setTitle("Search Result");
map.infoWindow.setContent(evt.result.name);
map.infoWindow.show(evt.result.feature.geometry);
var spotlight = map.on("extent-change", function(extentChange) {
var geom = screenUtils.toScreenGeometry(map.extent, map.width, map.height, extentChange.extent);
var width = geom.xmax - geom.xmin;
var height = geom.ymin - geom.ymax;
var max = height;
if ( width > height ) {
max = width;
}
var margin = '-' + Math.floor(max/2) + 'px 0 0 -' + Math.floor(max/2) + 'px';
query(".spotlight").addClass("spotlight-active").style({
max + "px",
height: max + "px",
margin: margin
});
spotlight.remove();
});
}
function enableSpotlight() {
var html = "<div id='spotlight' class='spotlight'></div>"
domConstruct.place(html, dom.byId("map_container"), "first");
}
function removeSpotlight() {
query(".spotlight").removeClass("spotlight-active");
map.infoWindow.hide();
map.graphics.clear();
}
});
</script>
</head>
<body class="soria">
<div id="search"></div>
<div id="map"></div>
</body>
</html>
dom.byId("search")：获取id为search的元素。
map.on("load", enableSpotlight)：为map注册load响应事件。
query(".spotlight").addClass("spotlight-active").style(）：对class为spotlight的所有元素添加class spotlight-active，并且设定样式。
query(".spotlight").removeClass("spotlight-active")：对class为spotlight的所有元素去除class spotlight-active