arcgis for javascript之ArcGISDynamicMapServiceLayer图层控制的实现

图层控制是非常多GIS系统里面必须的一个小功能，本文就说说arcgis for javascript下ArcGISDynamicMapServiceLayer图层控制的实现方式。首先看图：

实现效果

重点有下面两点：1、获取ArcGISDynamicMapServiceLayer的图层；2、控制图层的显示。

图层的获取可通过layerInfos实现，图层的显示通过setVisibleLayers实现，源码例如以下：

<!DOCTYPE html>

<html>

<head>

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

    <meta name="viewport" content="initial-scale=1, maximum-scale=1,user-scalable=no"/>

    <title>Simple Map</title>

    <link rel="stylesheet" href="http://localhost/arcgis_js_api/library/3.9/3.9/js/esri/css/esri.css">

    <style type="text/css">

        @import "http://localhost/arcgis_js_api/library/3.9/3.9/js/dojo/dojo/resources/dojo.css";

        @import "http://localhost/arcgis_js_api/library/3.9/3.9/js/dojo/dijit/themes/dijit.css";

        @import "http://localhost/arcgis_js_api/library/3.9/3.9/js/dojo/dijit/themes/tundra/tundra.css";

    </style>

    <style>

        html, body, #map {

            height: 100%;

            margin: 0;

            padding: 0;

        }

        body {

            background-color: #FFF;

            overflow: hidden;

            font-family: "Trebuchet MS";

        }

    </style>

    <script src="http://localhost/arcgis_js_api/library/3.9/3.9/init.js"></script>

    <script>

        var map, mapCenter;

        var visible=[], setLayerVisibility;;

        require([

            "esri/map",

            "esri/layers/ArcGISTiledMapServiceLayer",

            "esri/layers/FeatureLayer",

            "esri/layers/GraphicsLayer",

            "esri/geometry/Point",

            "esri/symbols/PictureMarkerSymbol",

            "esri/symbols/SimpleLineSymbol",

            "esri/renderers/SimpleRenderer",

            "dojo/_base/Color",

            "dojox/charting/Chart2D",

            "dojo/dom-construct",

            "dojo/domReady!"],

        function(Map,

             Tiled,

             FeatureLayer,

             GraphicsLayer,

             Point,

             PictureMarkerSymbol,

             SimpleLineSymbol,

             SimpleRenderer,

             Color,

             Chart2D,

             domConstruct)

        {

            map = new Map("map", {logo:false,slider: true});

            var tiled = new Tiled("http://localhost:6080/arcgis/rest/services/image/MapServer");

            map.addLayer(tiled,0);

            var dynamicMapServiceLayer = new esri.layers.ArcGISDynamicMapServiceLayer("http://localhost:6080/arcgis/rest/services/china/MapServer");

            map.addLayer(dynamicMapServiceLayer,1);

            var chartLayer = new GraphicsLayer({"id":"chartLayer"});

            map.addLayer(chartLayer,2);

            mapCenter = new Point(103.847, 36.0473, map.spatialReference);

            map.centerAndZoom(mapCenter,4);

            dojo.connect(dynamicMapServiceLayer,"onLoad",loadLayerList);

            function loadLayerList(layers){

                var html=""

                var infos=layers.layerInfos;

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

                    var info = infos[i];

                    //图层默认显示的话就把图层id加入到visible

                    if(info.defaultVisibility)

                    {

                        visible.push(info.id);

                    }

                    //输出图层列表的html

                    html=html+"<div><input id='"+info.id+"' name='layerList' class='listCss' type='checkbox' value='checkbox' onclick='setLayerVisibility()' "+(info.defaultVisibility ? "checked":"")+" />"+info.name+"</div>";

                }

                //设置可视图层

                dynamicMapServiceLayer.setVisibleLayers(visible);

                //在右边显示图层名列表

                dojo.byId("toc").innerHTML=html;

            }

            setLayerVisibility = function()

            {

                //用dojo.query获取css为listCss的元素数组

                var inputs = dojo.query(".listCss");

                visible = [];

                //对checkbox数组进行变量把选中的id加入到visible

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

                {

                    if(inputs[i].checked)

                    {

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

                    }

                }

                //设置可视图层

                dynamicMapServiceLayer.setVisibleLayers(visible);

            }

        });

    </script>

</head>

<body>

<div id="map">

    <div id="toc" style="position: absolute; left: 10px; bottom: 20px; border: 1px solid #9c9c9c; background: #fff; width: 100px; height: auto; z-index: 99;padding: 10px;"></div>

</div>

</body>

</html>

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arcgis for javascript之ArcGISDynamicMapServiceLayer图层控制的实现

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