ArcGIS api for javascript——地图配置-增加标注到滑动器

描述

ArcGISTiledMapServiceLayer，这意味着图层有一个在明确的比例的预先渲染的地图切片的cache。能够从tileInfo属性获得图层的的缓存比例数组。这是本例中标注如何被得到。在下面的代码中，记得"lods"是"levels of detail"。

var lods = layer.tileInfo.lods;

for (var i=0, il=lods.length; i<il; i++) {

  labels[i] = lods[i].scale;

构建这个比例等级的数组后，通过esriConfig中的sliderLabel.labels将比例等级数组应用为标注很容易的。

esriConfig.defaults.map.sliderLabel = {

...

  labels: labels,

...

};

 <!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>增加标注到滑动器</title>

     <link rel="stylesheet" type="text/css" href="http://serverapi.arcgisonline.com/jsapi/arcgis/1.5/js/dojo/dijit/themes/tundra/tundra.css">

     <script type="text/javascript" src="http://serverapi.arcgisonline.com/jsapi/arcgis/?v=1.5"></script>

     <script type="text/javascript">

         dojo.require("esri.map");

         function init() {

             var layer = new esri.layers.ArcGISTiledMapServiceLayer("http://server.arcgisonline.com/ArcGIS/rest/services/ESRI_Imagery_World_2D/MapServer");

              if(layer.loaded) {

                  initMap(layer);

              }else {

               dojo.connect(layer,"onLoad",initMap);

              }

         }

         function initMap(layer) {

            //增加自定义注标器

            //用层的缩放来展示滑动器类别

             var labels = [];

             var lods = layer.tileInfo.lods;

             alert(lods.length);

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

                 labels[i] = lods[i].scale;

             }

             esriConfig.defaults.map.sliderLabel = {

             tick:0,

             labels:labels,

             style:"width:2em;font-family:Verdana;font-size:65%;color:#fff;padding-left:2px;"

             };

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

             map.addLayer(layer);

         }

         dojo.addOnLoad(init);

     </script>

   </head>

    <body class="tundra">

     <div id="map" style="width:1024px; height:512px; border:1px solid #000;"></div>

   </body>

 </html>