ArcGIS api for javascript——明确的创建图层列表

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.

 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">

 <html>

   <head>

     <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>

     <meta http-equiv="X-UA-Compatible" content="IE=7" />

     <title>明确的创建图层列表</title>

     <link rel="stylesheet" type="text/css" href="http://serverapi.arcgisonline.com/jsapi/arcgis/1.6/js/dojo/dijit/themes/tundra/tundra.css">

     <script type="text/javascript" src="http://serverapi.arcgisonline.com/jsapi/arcgis/?v=1.6"></script>

      <script type="text/javascript">

         dojo.require("esri.map");

         var dynamicMapServiceLayer,map,visible = [];

         function init() {

             map = new esri.Map("map");

             var imageParameters = new esri.layers.ImageParameters();

             imageParameters.visibleLayers = [0,1,2];

             dynamicMapServiceLayer=new esri.layers.ArcGISDynamicMapServiceLayer(

             "http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Specialty/ESRI_StatesCitiesRivers_USA/MapServer", {"imageParameters":imageParameters}

             );

             map.addLayer(dynamicMapServiceLayer);

         } 

         function updateLayerVisibility() {

             var inputs = dojo.query(".list_item"), input;

             //在这个应用中，图层 2是一只可见的

             visible = [2];

             for( var i=0,j=inputs.length;i<j;i++) {

                 if(inputs[i].checked) {

                     visible.push(inputs[i].id);

                 }

             }

             dynamicMapServiceLayer.setVisibleLayers(visible);

         }  

        dojo.addOnLoad(init);

     </script>

   </head>

   <body >

   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 />

     <br />

       Layer List: <span id="layer_list"><input type="checkbox" class="list_item" checked="checked" id='0' value=0 onclick="updateLayerVisibility();"/>Cities&nbsp;&nbsp;

           <input type="checkbox" class="list_item" checked="checked" id="1" value=1 onclick="updateLayerVisibility();"/>River&nbsp;&nbsp;

       </span><br />

       <br />

       <div id="map" class="tundra" style="width: 900px;height: 600px;border: 1px solid #000"></div>

   </body>

 </html>

巴特西

ArcGIS api for javascript——明确的创建图层列表

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