Geoserver+Openlayers拉框查询
程序员文章站
2023-12-27 23:19:57
1.代码 1 2 3 4 5 OpenLayers 6
然后在下次框选之前，通过 id 找到上次那个 feature，并删掉
1.代码
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: value
107 });
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: 2
115 }),
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: 2
133 }),
134 image: new ol.style.circle({
135 radius: 7,
136 fill: new ol.style.fill({
137 color: '#ffcc33'
138 })
139 })
140 }),
141 type: value
142 });
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: 2
195 })
196 }));
197 }
198 }
199 selectnum=[];
200 for (var i = 0; i < features.length; i++) {
201 var feature = features[i];
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: 2
210 })
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": i
220 };
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: datatable
235 , offset: ['250px', '290px']
236 , zindex: 1
237 , scrollbar: false
238 , resize: false
239 , skin: 'layui-layer-molv'
240 , closebtn: 2
241 , 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: 0.8
262 });
263 });
264
265 if (tableins) {
266 tableins.reload({
267 data: querydata
268 });
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.filter
289 },
290 datatype: 'jsonp',
291 jsonp: 'format_options',
292 jsonpcallback: 'callback:' + options.callback
293 });
294
295 }
296
297 </script>
298 </body>
299 </html>
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
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
参考
https://www.cnblogs.com/kkyyhh96/p/6379515.html
https://blog.csdn.net/songjian1314/article/details/17263865
https://blog.csdn.net/shaxiaozilove/article/details/60780175
https://blog.csdn.net/m0_37659871/article/details/80598589
https://openlayers.org/en/latest/examples/draw-features.html
https://openlayers.org/en/latest/examples/draw-shapes.html