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,
...
};
1 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> 2 <html> 3 <head> 4 <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/> 5 <meta http-equiv="X-UA-Compatible" content="IE=7" /> 6 <title>增加标注到滑动器</title> 7 <link rel="stylesheet" type="text/css" href="http://serverapi.arcgisonline.com/jsapi/arcgis/1.5/js/dojo/dijit/themes/tundra/tundra.css"> 8 <script type="text/javascript" src="http://serverapi.arcgisonline.com/jsapi/arcgis/?v=1.5"></script> 9 <script type="text/javascript"> 10 11 dojo.require("esri.map"); 12 function init() { 13 var layer = new esri.layers.ArcGISTiledMapServiceLayer("http://server.arcgisonline.com/ArcGIS/rest/services/ESRI_Imagery_World_2D/MapServer"); 14 15 if(layer.loaded) { 16 17 initMap(layer); 18 }else { 19 20 dojo.connect(layer,"onLoad",initMap); 21 } 22 } 23 24 function initMap(layer) { 25 26 //增加自定义注标器 27 //用层的缩放来展示滑动器类别 28 var labels = []; 29 var lods = layer.tileInfo.lods; 30 31 alert(lods.length); 32 for(var i=0,j=lods.length;i<j;i++) { 33 labels[i] = lods[i].scale; 34 35 } 36 esriConfig.defaults.map.sliderLabel = { 37 tick:0, 38 labels:labels, 39 style:"2em;font-family:Verdana;font-size:65%;color:#fff;padding-left:2px;" 40 41 }; 42 43 var map = new esri.Map("map"); 44 map.addLayer(layer); 45 46 } 47 dojo.addOnLoad(init); 48 49 50 51 </script> 52 </head> 53 <body class="tundra"> 54 <div id="map" style="1024px; height:512px; border:1px solid #000;"></div> 55 </body> 56 </html> 57 58