描述
本例展示了如何确切地创建一个地图服务里的图层列表。这个列表由HTML checkboxe组成，可用用于开关图层的可见性。
函数updateLayerVisibility()包含开关图层的逻辑。函数循环访问列表里的每个图层，依赖checkbox状态图层是否应该可见，并且使用 ArcGISDynamicMapServiceLayer.setVisibleLayers()更新相应图层可见性。
如果需要创建地图服务里的所有图层的图层列表，见示例动态地创建图层列表.
1 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> 2 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> 3 <html> 4 <head> 5 <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/> 6 <meta http-equiv="X-UA-Compatible" content="IE=7" /> 7 <title>明确的创建图层列表</title> 8 <link rel="stylesheet" type="text/css" href="http://serverapi.arcgisonline.com/jsapi/arcgis/1.6/js/dojo/dijit/themes/tundra/tundra.css"> 9 <script type="text/javascript" src="http://serverapi.arcgisonline.com/jsapi/arcgis/?v=1.6"></script> 10 <script type="text/javascript"> 11 dojo.require("esri.map"); 12 13 var dynamicMapServiceLayer,map,visible = []; 14 15 function init() { 16 17 map = new esri.Map("map"); 18 19 var imageParameters = new esri.layers.ImageParameters(); 20 imageParameters.visibleLayers = [0,1,2]; 21 22 dynamicMapServiceLayer=new esri.layers.ArcGISDynamicMapServiceLayer( 23 "http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Specialty/ESRI_StatesCitiesRivers_USA/MapServer", {"imageParameters":imageParameters} 24 ); 25 map.addLayer(dynamicMapServiceLayer); 26 } 27 28 29 function updateLayerVisibility() { 30 var inputs = dojo.query(".list_item"), input; 31 //在这个应用中，图层 2是一只可见的 32 visible = [2]; 33 for( var i=0,j=inputs.length;i<j;i++) { 34 if(inputs[i].checked) { 35 visible.push(inputs[i].id); 36 } 37 38 } 39 dynamicMapServiceLayer.setVisibleLayers(visible); 40 41 } 42 43 44 dojo.addOnLoad(init); 45 </script> 46 47 </head> 48 49 <body > 50 This sample loads an ArcGISDynamicMapServiceLayer and presents check boxes for only the layers that should be toggled on and off by users. <br />ed to toggle their visibility.<br /> 51 <br /> 52 Layer List: <span id="layer_list"><input type="checkbox" class="list_item" checked="checked" id='0' value=0 onclick="updateLayerVisibility();"/>Cities 53 <input type="checkbox" class="list_item" checked="checked" id="1" value=1 onclick="updateLayerVisibility();"/>River 54 55 </span><br /> 56 <br /> 57 <div id="map" class="tundra" style=" 900px;height: 600px;border: 1px solid #000"></div> 58 </body> 59 </html>