OL3中结合Jquery UI实现图层拖动并改变图层顺序

概述：

本文讲述OL3中结合Jquery UI实现图层的拖动以及拖动好图层顺序的改变。

效果：

代码：

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
	<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
	<title>静态图片-加载中国</title>
	<link rel="stylesheet" href="https://openlayers.org/en/v4.1.1/css/ol.css" type="text/css">
	<link rel="stylesheet" href="//code.jquery.com/ui/1.12.1/themes/base/jquery-ui.css">
	<style type="text/css">
		body, #map {
			border: 0px;
			margin: 0px;
			padding: 0px;
			 100%;
			height: 100%;
			font-size: 13px;
			overflow: hidden;
		}
		#map{ 
			background: url("../../images/bgImg.gif");
			background-repeat: inherit;
		}
		#sortable {
			position: absolute;
			right: 20px;
			bottom: 20px;
			z-index: 999; 
			list-style-type: none; 
			margin: 0; 
			padding: 5px; 
			padding-top: 10px; 
			 200px; 
			background: #D2E959;
			border: 1px solid #cccccc;
			box-shadow: 2px 2px 3px #bbbbbb;
			border-radius: 4px;
		}
		#sortable li { cursor:move; margin: 0 3px 3px 3px; padding: 0.4em; padding-left: 1.5em; font-size: 1.4em; height: 18px; }
		#sortable li span { position: absolute; margin-left: -1.3em; }
	</style>
	<!-- The line below is only needed for old environments like Internet Explorer and Android 4.x -->
    <script src="https://cdn.polyfill.io/v2/polyfill.min.js?features=requestAnimationFrame,Element.prototype.classList,URL"></script>
    <script src="https://openlayers.org/en/v4.1.1/build/ol.js"></script>
    <script type="text/javascript" src="../../../../plugin/jquery/jquery-1.8.3.js"></script>
      <script src="https://code.jquery.com/ui/1.12.1/jquery-ui.js"></script>
	<script type="text/javascript">
		var map, image;
		function init(){
			var projection = ol.proj.get("EPSG:3857");
			
			var vec_w = getTdtLayer("vec_w");
			var img_w = getTdtLayer("img_w");
			var ter_w = getTdtLayer("ter_w");
			
			var layers = [vec_w, img_w, ter_w];
			
			map = new ol.Map({
				controls: ol.control.defaults({
					attribution: false
				}),
				target: 'map',
				layers: layers,
				view: new ol.View({
					center: ol.proj.transform([104.214, 35.847], 'EPSG:4326', 'EPSG:3857'),
		            zoom: 4
				})
			});
			
			var cva_w = getTdtLayer("cva_w");
			cva_w.setZIndex(100);
			map.addLayer(cva_w);
			
			var _layers = [{
				name:"矢量图",
				layer:vec_w
			},{
				name:"影像图",
				layer:img_w
			},{
				name:"地形图",
				layer:ter_w
			}];
			_layers = _layers.reverse();
			var _layerUl = $("#sortable");
			
			for(var i=0, len = _layers.length;i<len;i++){
				var li = $("<li/>").addClass("ui-state-default").html(_layers[i]["name"]);
				li.data("layer",_layers[i]["layer"]);
				_layerUl.append(li);
			}
			
			updateLayersIndex();
			
			_layerUl.sortable({stop: function(event, ui) {
		    	updateLayersIndex();
		    }});
		    
		    function updateLayersIndex(){
		    	var _index = [30, 20, 10];
		    	for(var i=0,len=_index.length;i<len;i++){
		    		var _layer = $(_layerUl.children()[i]).data("layer");
		    		_layer.setZIndex(_index[i]);
		    	}
		    }
		}

		function getTdtLayer(lyr){
			var url = "http://t0.tianditu.com/DataServer?T="+lyr+"&X={x}&Y={y}&L={z}";
    		var layer = new ol.layer.Tile({
				source: new ol.source.XYZ({
			        url:url
			    })
			});
			return layer;
		}
	</script>
</head>
<body onLoad="init()">
<div id="map">
	<ul id="sortable"></ul>
</div>
</body>
</html>

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