我正在开发一个项目,尝试使用JavaScript API将ArcGIS online中的要素图层添加到Web Map 应用程序中,用户可以通过HTML复选框打开和关闭图层 . 这些图层正确导入,并在绕过勾选框时显示,但我可以使用它来处理复选框 . 我已经从ArcGIS样本中删除了代码等等,所以它一定是我一直想念的小东西!
这是代码 - 基本上我想要的是在基于用户勾选和关闭的复选框的常量基本 Map 之上切换打开和关闭的图层
<!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>Select with feature layer</title>
<link rel="stylesheet" href="http://js.arcgis.com/3.10/js/dojo/dijit/themes/tundra/tundra.css">
<link rel="stylesheet" href="http://js.arcgis.com/3.10/js/esri/css/esri.css">
<style>
html, body, #mapDiv {
padding: 0;
margin: 0;
height: 100%;
}
#messages{
background-color: #fff;
box-shadow: 0 0 5px #888;
font-size: 1.1em;
max-width: 15em;
padding: 0.5em;
position: absolute;
right: 20px;
top: 20px;
z-index: 40;
}
</style>
<script src="http://js.arcgis.com/3.10/"></script>
<script>
var map;
require([
"esri/map", "esri/layers/FeatureLayer",
"esri/tasks/query", "esri/geometry/Circle",
"esri/graphic", "esri/InfoTemplate", "esri/symbols/SimpleMarkerSymbol",
"esri/symbols/SimpleLineSymbol", "esri/symbols/SimpleFillSymbol", "esri/renderers/SimpleRenderer",
"esri/config", "esri/Color", "dojo/dom", "dojo/domReady!", "dojo/on", "dojo/query", "dojo/domReady!", "esri/layers/ArcGISDynamicMapServiceLayer", "esri/layers/ImageParameters",
], function (
Map, FeatureLayer,
Query, Circle,
Graphic, InfoTemplate, SimpleMarkerSymbol,
SimpleLineSymbol, SimpleFillSymbol, SimpleRenderer,
esriConfig, Color, dom, on, query, ArcGISDynamicMapServiceLayer, ImageParameters
) {
// use a proxy page if a URL generated by this page is greater than 2000 characters
//
// this should not be needed as nearly all query & select functions are performed on the client
esriConfig.defaults.io.proxyUrl = "/proxy";
map = new Map("mapDiv", {
basemap: "streets",
center: [-120.303130, 36.542750],
zoom: 5,
slider: false
});
//add the census block points in on demand mode. Note that an info template has been defined so when
//selected features are clicked a popup window will appear displaying the content defined in the info template.
var Offices = new FeatureLayer("URL", {
infoTemplate: new InfoTemplate("Block: ${BLOCK}", "${*}"),
outFields: ["*"]
});
var Northridge = new FeatureLayer("URL", {
infoTemplate: new InfoTemplate("Block: ${BLOCK}", "${*}"),
outFields: ["*"]
});
var Associates = new FeatureLayer("URL", {
infoTemplate: new InfoTemplate("Block: ${BLOCK}", "${*}"),
outFields: ["*"]
});
// selection symbol used to draw the selected census block points within the buffer polygon
var symbol = new SimpleMarkerSymbol(
SimpleMarkerSymbol.STYLE_CIRCLE,
12,
new SimpleLineSymbol(
SimpleLineSymbol.STYLE_NULL,
new Color([247, 34, 101, 0.9]),
1
),
new Color([207, 34, 171, 0.5])
);
Offices.setSelectionSymbol(symbol);
//make unselected features invisible
var nullSymbol = new SimpleMarkerSymbol().setSize(10);
var RedCircle = new SimpleMarkerSymbol().setSize(8);
Offices.setRenderer(new SimpleRenderer(nullSymbol));
on(dom.byId("layer0CheckBox"), "change", updateLayerVisibility);
on(dom.byId("layer1CheckBox"), "change", updateLayerVisibility);
on(dom.byId("layer2CheckBox"), "change", updateLayerVisibility);
function updateLayerVisibility() {
var inputs = query(".list_item");
var inputCount = inputs.length;
//in this application layer 2 is always on.
visibleLayerIds = [2];
for (var i = 0; i < inputCount; i++) {
if (inputs[i].checked) {
visibleLayerIds.push(inputs[i].value);
}
}
if (visibleLayerIds.length === 0) {
visibleLayerIds.push(-1);
}
map.addLayers(visibleLayerIds);
}
});
</script>
</head>
<body>
Layer List : <span id="layer_list"><input type='checkbox' class='list_item' id='layer0CheckBox' value="Northridge" />Earthquake
<input type='checkbox' class='list_item' id='layer1CheckBox' value="Offices" />Offices
<input type='checkbox' class='list_item' id='layer2CheckBox' value="Associates" />Associates
</span>
<div id="mapDiv"></div>
</body>
</html>
2 回答
这很久以前完成了
在这里查看一个例子:http://smart-tech-group.com/arcgismap/ Map 相关的逻辑存储在http://smart-tech-group.com/arcgismap/APP/view/ArcMapViewer.js我当时是一个js-newbie,所以随意争论我的代码风格;)
在函数updateLayerVisibility中,map.addLayers用法是错误的 . 你应该添加featurelayers,图层,动态图层或平铺图层,而不是id,除非你将它们存储在数组visibleLayerIds中 .
您可以考虑使用ArcGISDynamicMapServiceLayer来控制可见的图层ID . 然后使用setVisibleLayers API参见https://developers.arcgis.com/javascript/jsapi/arcgisdynamicmapservicelayer-amd.html
FeatureLayer通常用于单个图层,使用MapServer / 2或FeatureServer / 2等服务 .