1.代码[url=]![]() [/url]
1 <!DOCTYPE html> 2 <html> 3 <head> 4 <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/> 5 <title>OpenLayers</title> 6 <link rel="stylesheet" href="geoserver/ol.css" type="text/css"> 7 <script src="geoserver/ol.js"></script> 8 <script src="bower_components/jquery/dist/jquery.min.js"></script> 9 <link rel="stylesheet" href="plugins/layui-v2.4.3/layui/css/layui.css"> 10 <script src="plugins/layui-v2.4.3/layui/layui.js" charset="utf-8"></script> 11 <link rel="stylesheet" href="https://openlayers.org/en/v3.20.1/css/ol.css" type="text/css"> 12 <#--注意openlayer的版本号，高版本存在es6中新语法不兼容的情况--> 13 <script src="https://cdn.polyfill.io/v2/polyfill.min.js?features=requestAnimationFrame,Element.prototype.classList,URL"></script> 14 <script src="https://openlayers.org/en/v3.20.1/build/ol.js"></script> 15 </head> 16 <style> 17 #map { 18 height: 600px; 19 /*width: 1024px;*/ 20 /* float: left;*/ 21 } 22 </style> 23 <body> 24 <div id="map"> 25 <form class="form-inline"> 26 <label>查询类型</label> 27 <select id="type"> 28 <option value="None">None</option> 29 <option value="Point">点击</option> 30 <option value="Polygon">多边形</option> 31 <option value="Circle">拉框</option> 32 </select> 33 </form> 34 </div> 35 <script> 36 var map = new ol.Map({ 37 target: 'map', 38 view: new ol.View({ 39 projection: 'EPSG:4326', 40 center: [104.07, 30.72], 41 zoom: 7 42 }) 43 }); 44 var wfsParams = { 45 service: 'WFS', 46 version: '1.1.1', 47 request: 'GetFeature', 48 typeName: 'map_dz:tl_lx_g', //图层名称，可以是单个或多个 49 outputFormat: 'text/javascript', //重点，不要改变 50 format_options: 'callback:loadFeatures' //回调函数声明 51 }; 52 53 var vectorSource = new ol.source.Vector({ 54 format: new ol.format.GeoJSON(), 55 loader: function (extent, resolution, projection) { //加载函数 56 var url = 'http://192.168.1.113:8080/geoserver/map_dz/wms'; 57 $.ajax({ 58 url: url, 59 data: $.param(wfsParams), //传参 60 type: 'GET', 61 dataType: 'jsonp', //解决跨域的关键 62 jsonpCallback: 'loadFeatures' //回调 63 64 }); 65 }, 66 strategy: ol.loadingstrategy.tile(new ol.tilegrid.createXYZ({ 67 maxZoom: 20 68 })), 69 projection: 'EPSG:4326' 70 }); 71 //回调函数使用 72 window.loadFeatures = function (response) { 73 vectorSource.addFeatures((new ol.format.GeoJSON()).readFeatures(response)); //载入要素 74 }; 75 var vectorLayer = new ol.layer.Vector({ 76 source: vectorSource, 77 style: new ol.style.Style({ 78 stroke: new ol.style.Stroke({ 79 color: 'rgba(0, 0, 255, 1.0)', 80 width: 2 81 }) 82 }) 83 }); 84 map.addLayer(vectorLayer); 85 var draw; 86 var typeSelect = document.getElementById('type'); 87 var value; 88 var num=10;//用于删除之前的框，表示号，随便取一个 89 function addInteraction() { 90 if (value !== 'None') { 91 if (value === 'Polygon') { 92 draw = new ol.interaction.Draw({ 93 source: vectorLayer.getSource(), 94 style: new ol.style.Style({ 95 stroke: new ol.style.Stroke({ 96 color: '#ffcc33', 97 width: 2 98 }), 99 image: new ol.style.Circle({100 radius: 7,101 fill: new ol.style.Fill({102 color: '#ffcc33'103 })104 })105 }),106 type: value107 });108 } else if (value === 'Circle') {109 draw = new ol.interaction.Draw({110 source: vectorLayer.getSource(),111 style: new ol.style.Style({112 stroke: new ol.style.Stroke({113 color: '#ffcc33',114 width: 2115 }),116 image: new ol.style.Circle({117 radius: 7,118 fill: new ol.style.Fill({119 color: '#ffcc33'120 })121 })122 }),123 type: value,124 geometryFunction: ol.interaction.Draw.createBox()125 });126 } else if (value === 'Point') {127 draw = new ol.interaction.Draw({128 source: vectorLayer.getSource(),129 style: new ol.style.Style({130 stroke: new ol.style.Stroke({131 color: '#ffcc33',132 width: 2133 }),134 image: new ol.style.Circle({135 radius: 7,136 fill: new ol.style.Fill({137 color: '#ffcc33'138 })139 })140 }),141 type: value142 });143 }144 145 map.addInteraction(draw);146 //删除之前draw的部分147 draw.on('drawstart',function(evt) {148 var featureAdd=vectorLayer.getSource().getFeatureById(num);149 if(featureAdd!=null){150 vectorLayer.getSource().removeFeature(featureAdd);151 }152 });153 //绘图结束，处理选中部分154 draw.on('drawend',function(e){155 e.feature.setId(num);156 var geom=e.feature.getGeometry();157 var coor = geom.v;158 mapSelect(coor);159 });160 }161 }162 //选择事件163 typeSelect.onchange = function() {164 value = typeSelect.value;165 map.removeInteraction(draw);166 addInteraction();167 };168 169 //draw图像与原始数据相交170 function mapSelect(coor) {171 if(value=='Point') {172 coor = [coor[0]-0.0001,coor[1]-0.0001,coor[0]+0.0001,coor[1]+0.0001];173 }174 var FILTER = '<Filter xmlns:ogc="http://www.opengis.net/ogc" xmlns:gml="http://www.opengis.net/gml"><BBOX><PropertyName>geom</PropertyName><gml:Envelope srsName="EPSG:4326"><gml:lowerCorner>' + coor[0] + ' ' + coor[1] + '</gml:lowerCorner><gml:upperCorner>' + coor[2] + ' ' + coor[3] + '</gml:upperCorner></gml:Envelope></BBOX></Filter>';175 getFeature({176 typename: 'map_dz:tl_lx_g',//查询的服务图层名称177 filter: FILTER,//查询条件178 callback: 'getIdentifyroadGrid'//查询的回调函数179 });180 }181 var selectNum=[];182 var geojsonFormat = new ol.format.GeoJSON({defaultDataProjection: "EPSG:4326"});183 function getIdentifyroadGrid(res) {184 var queryData = [];185 var features = geojsonFormat.readFeatures(res);186 187 for (var nu = 0; nu<selectNum.length;nu++) {188 var featureSelect=vectorLayer.getSource().getFeatureById(selectNum[nu]);189 if(featureSelect!=null) {190 featureSelect.setStyle(191 new ol.style.Style({192 stroke: new ol.style.Stroke({193 color: 'rgba(0, 0, 255, 1.0)',194 width: 2195 })196 }));197 }198 }199 selectNum=[];200 for (var i = 0; i < features.length; i++) {201 var feature = features;202 console.log(feature);203 selectNum.push(feature.f);204 var featureSelectCurrent=vectorLayer.getSource().getFeatureById(feature.f);205 featureSelectCurrent.setStyle(206 new ol.style.Style({207 stroke: new ol.style.Stroke({208 color: '#ff4118',209 width: 2210 })211 }));212 var lxmc = feature.H["lxmc"];213 var ldbm = feature.H["ldbm"];214 var lxbh = feature.H["lxbh"];215 var result = {216 "lxmc": lxmc,217 "ldbm": ldbm,218 "lxbh": lxbh,219 "setindex": i220 };221 queryData.push(result)222 }223 console.log(selectNum);224 var tableIns=null;225 var dataTable = "<table class=\"layui-table\" lay-filter=\"demo\" id=\"joinTab\"></table>";226 layui.use(['table', 'layer'], function () {227 var table = layui.table;228 var layer = layui.layer;229 var index = layer.open({230 type: 1 //Page层类型231 , title: '要素属性'232 , shade: 0 //遮罩透明度233 , anim: 0 //0-6的动画形式，-1不开启234 , content: dataTable235 , offset: ['250px', '290px']236 , zIndex: 1237 , scrollbar: false238 , resize: false239 , skin: 'layui-layer-molv'240 , closeBtn: 2241 , btn: ["关闭"]242 , yes: function (index) {243 layer.close(index);244 }245 , cancel: function () {246 }247 });248 tableIns = table.render({249 elem: "#joinTab",250 width: "auto",251 height: "auto",252 data: queryData,253 initSort: {field: 'lxbh', type: 'desc'},254 cols: [[255 {field: 'lxmc', title: '路线名称', width: 150, align: 'center', sort: true},256 {field: 'ldbm', title: '路线编号', width: 150, align: 'center', sort: true},257 {field: 'lxbh', title: '路段编码', width: 150, align: 'center', sort: true}258 ]]259 });260 layer.style(index, {261 opacity: 0.8262 });263 });264 265 if (tableIns) {266 tableIns.reload({267 data: queryData268 });269 } else {270 // console.log("Do Nothing!");271 }272 }273 274 //请求wfs数据275 function getFeature(options) {276 $.ajax(/*'http://192.168.1.113:8080/geoserver/map_dz/wms', */{277 type: 'GET',278 url: 'http://192.168.1.113:8080/geoserver/map_dz/wms',279 data: {280 service: 'WFS',281 version: '1.1.1',282 request: 'GetFeature',283 typename: options.typename,284 srsname: options.srid,285 outputFormat: 'text/javascript',286 viewparams: options.viewparams,287 bbox: (options.extent === undefined) ? undefined : options.extent.join(',') + ',' + options.srid,288 filter: options.filter289 },290 dataType: 'jsonp',291 jsonp: 'format_options',292 jsonpCallback: 'callback:' + options.callback293 });294 295 }296 297 </script>298 </body>299 </html>[url=]![]() [/url]
2.代码解释这一部分是主要针对用户做此功能的时候，遇到的问题进行总结： 在引入 Openlayers 的 JS 文件的时候，注意版本号，5.0+ 的版本中大量应用了ES6 的最新特性，如果直接引入 5.0+ ，可能与前期的项目有所冲突，所以这里建议使用低版本，同样能完成拉框查询 ![]()
这里主要通过 Draw 对象进行框选的，Draw 的本质是在图层上兴建 Shape ，那么在下一次框选的时候，需要把上次 Draw 的框去掉：（回答了网上用户的提问：openlayers 在重新画图(圆或矩形)如何清除之前的图，Openlayer删除上一次绘制的图） 首先记录框选时，增加的框框的ID ![]() 然后在下次框选之前，通过 id 找到上次那个 Feature，并删掉
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对选中的对象进行重新设置颜色，这里主要通过 Style 属性进行处理： ![]()
在下次选中对象的时候，删除上次选中对象的样式 将选中对象的 id 压到数组汇总 ![]()
在下次设置选中对象的样式之前，遍历数组，对上次选中的feature进行样式设置（设置为原来的样式） ![]()
3.结果
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奈斯，感谢分享
