OL3中结合Jquery UI实现图层拖动并改变图层顺序

来源：互联网发布：亚思捷软件编辑：程序博客网时间：2024/06/06 14:11

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;width: 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; width: 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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