Geoserver + Openlayers 拉框查询

<!DOCTYPE html>
<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
    <title>OpenLayers</title>
    <link rel="stylesheet" href="geoserver/ol.css" type="text/css">
    <script src="geoserver/ol.js"></script>
    <script src="bower_components/jquery/dist/jquery.min.js"></script>
    <link rel="stylesheet" href="plugins/layui-v2.4.3/layui/css/layui.css">
    <script src="plugins/layui-v2.4.3/layui/layui.js" charset="utf-8"></script>
    <link rel="stylesheet" href="https://openlayers.org/en/v3.20.1/css/ol.css" type="text/css">
    <#--注意openlayer的版本号,高版本存在es6中新语法不兼容的情况-->
    <script src="https://cdn.polyfill.io/v2/polyfill.min.js?features=requestAnimationFrame,Element.prototype.classList,URL"></script>
    <script src="https://openlayers.org/en/v3.20.1/build/ol.js"></script>
</head>
<style>
    #map {
        height: 600px;
        /*width: 1024px;*/
        /* float: left;*/
    }
</style>
<body>
<div id="map">
<form class="form-inline">
    <label>查询类型</label>
    <select id="type">
        <option value="None">None</option>
        <option value="Point">点击</option>
        <option value="Polygon">多边形</option>
        <option value="Circle">拉框</option>
    </select>
</form>
</div>
<script>
    var map = new ol.Map({
        target: 'map',
        view: new ol.View({
            projection: 'EPSG:4326',
            center: [104.07, 30.72],
            zoom: 7
        })
    });
    var wfsParams = {
        service: 'WFS',
        version: '1.1.1',
        request: 'GetFeature',
        typeName: 'map_dz:tl_lx_g',  //图层名称,可以是单个或多个
        outputFormat: 'text/javascript',  //重点,不要改变
        format_options: 'callback:loadFeatures'  //回调函数声明
    };

    var vectorSource = new ol.source.Vector({
        format: new ol.format.GeoJSON(),
        loader: function (extent, resolution, projection) {  //加载函数
            var url = 'http://192.168.1.113:8080/geoserver/map_dz/wms';
            $.ajax({
                url: url,
                data: $.param(wfsParams),   //传参
                type: 'GET',
                dataType: 'jsonp',   //解决跨域的关键
                jsonpCallback: 'loadFeatures'  //回调

            });
        },
        strategy: ol.loadingstrategy.tile(new ol.tilegrid.createXYZ({
            maxZoom: 20
        })),
        projection: 'EPSG:4326'
    });
    //回调函数使用
    window.loadFeatures = function (response) {
        vectorSource.addFeatures((new ol.format.GeoJSON()).readFeatures(response));  //载入要素
    };
    var vectorLayer = new ol.layer.Vector({
        source: vectorSource,
        style: new ol.style.Style({
            stroke: new ol.style.Stroke({
                color: 'rgba(0, 0, 255, 1.0)',
                width: 2
            })
        })
    });
    map.addLayer(vectorLayer);
    var draw;
    var typeSelect = document.getElementById('type');
    var value;
    var num=10;//用于删除之前的框,表示号,随便取一个
    function addInteraction() {
        if (value !== 'None') {
            if (value === 'Polygon') {
                draw = new ol.interaction.Draw({
                    source: vectorLayer.getSource(),
                    style: new ol.style.Style({
                        stroke: new ol.style.Stroke({
                            color: '#ffcc33',
                            width: 2
                        }),
                        image: new ol.style.Circle({
                            radius: 7,
                            fill: new ol.style.Fill({
                                color: '#ffcc33'
                            })
                        })
                    }),
                    type: value
                });
            } else if (value === 'Circle') {
                draw = new ol.interaction.Draw({
                    source: vectorLayer.getSource(),
                    style: new ol.style.Style({
                        stroke: new ol.style.Stroke({
                            color: '#ffcc33',
                            width: 2
                        }),
                        image: new ol.style.Circle({
                            radius: 7,
                            fill: new ol.style.Fill({
                                color: '#ffcc33'
                            })
                        })
                    }),
                    type: value,
                    geometryFunction: ol.interaction.Draw.createBox()
                });
            } else if (value === 'Point') {
                draw = new ol.interaction.Draw({
                    source: vectorLayer.getSource(),
                    style: new ol.style.Style({
                        stroke: new ol.style.Stroke({
                            color: '#ffcc33',
                            width: 2
                        }),
                        image: new ol.style.Circle({
                            radius: 7,
                            fill: new ol.style.Fill({
                                color: '#ffcc33'
                            })
                        })
                    }),
                    type: value
                });
            }

            map.addInteraction(draw);
            //删除之前draw的部分
            draw.on('drawstart',function(evt) {
                var featureAdd=vectorLayer.getSource().getFeatureById(num);
                if(featureAdd!=null){
                    vectorLayer.getSource().removeFeature(featureAdd);
                }
            });
            //绘图结束,处理选中部分
            draw.on('drawend',function(e){
                e.feature.setId(num);
                var geom=e.feature.getGeometry();
                var coor = geom.v;
                mapSelect(coor);
            });
        }
    }
    //选择事件
    typeSelect.onchange = function() {
        value = typeSelect.value;
        map.removeInteraction(draw);
        addInteraction();
    };

    //draw图像与原始数据相交
    function mapSelect(coor) {
        if(value=='Point') {
            coor = [coor[0]-0.0001,coor[1]-0.0001,coor[0]+0.0001,coor[1]+0.0001];
        }
        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>';
        getFeature({
            typename: 'map_dz:tl_lx_g',//查询的服务图层名称
            filter: FILTER,//查询条件
            callback: 'getIdentifyroadGrid'//查询的回调函数
        });
    }
    var selectNum=[];
    var geojsonFormat = new ol.format.GeoJSON({defaultDataProjection: "EPSG:4326"});
    function getIdentifyroadGrid(res) {
        var queryData = [];
        var features = geojsonFormat.readFeatures(res);

       for (var nu = 0; nu<selectNum.length;nu++) {
            var featureSelect=vectorLayer.getSource().getFeatureById(selectNum[nu]);
            if(featureSelect!=null) {
                featureSelect.setStyle(
                        new ol.style.Style({
                            stroke: new ol.style.Stroke({
                                color: 'rgba(0, 0, 255, 1.0)',
                                width: 2
                            })
                        }));
            }
        }
        selectNum=[];
        for (var i = 0; i < features.length; i++) {
            var feature = features[i];
            console.log(feature);
            selectNum.push(feature.f);
            var featureSelectCurrent=vectorLayer.getSource().getFeatureById(feature.f);
            featureSelectCurrent.setStyle(
                    new ol.style.Style({
                        stroke: new ol.style.Stroke({
                            color: '#ff4118',
                            width: 2
                        })
                    }));
            var lxmc = feature.H["lxmc"];
            var ldbm = feature.H["ldbm"];
            var lxbh = feature.H["lxbh"];
            var result = {
                "lxmc": lxmc,
                "ldbm": ldbm,
                "lxbh": lxbh,
                "setindex": i
            };
            queryData.push(result)
        }
        console.log(selectNum);
        var tableIns=null;
        var dataTable = "<table class=\"layui-table\" lay-filter=\"demo\" id=\"joinTab\"></table>";
        layui.use(['table', 'layer'], function () {
            var table = layui.table;
            var layer = layui.layer;
            var index = layer.open({
                type: 1 //Page层类型
                , title: '要素属性'
                , shade: 0 //遮罩透明度
                , anim: 0 //0-6的动画形式,-1不开启
                , content: dataTable
                , offset: ['250px', '290px']
                , zIndex: 1
                , scrollbar: false
                , resize: false
                , skin: 'layui-layer-molv'
                , closeBtn: 2
                , btn: ["关闭"]
                , yes: function (index) {
                    layer.close(index);
                }
                , cancel: function () {
                }
            });
            tableIns = table.render({
                elem: "#joinTab",
                width: "auto",
                height: "auto",
                data: queryData,
                initSort: {field: 'lxbh', type: 'desc'},
                cols: [[
                    {field: 'lxmc', title: '路线名称', width: 150, align: 'center', sort: true},
                    {field: 'ldbm', title: '路线编号', width: 150, align: 'center', sort: true},
                    {field: 'lxbh', title: '路段编码', width: 150, align: 'center', sort: true}
                ]]
            });
            layer.style(index, {
                opacity: 0.8
            });
        });

        if (tableIns) {
            tableIns.reload({
                data: queryData
            });
        } else {
            // console.log("Do Nothing!");
        }
    }

    //请求wfs数据
    function getFeature(options) {
        $.ajax(/*'http://192.168.1.113:8080/geoserver/map_dz/wms', */{
            type: 'GET',
            url: 'http://192.168.1.113:8080/geoserver/map_dz/wms',
            data: {
                service: 'WFS',
                version: '1.1.1',
                request: 'GetFeature',
                typename: options.typename,
                srsname: options.srid,
                outputFormat: 'text/javascript',
                viewparams: options.viewparams,
                bbox: (options.extent === undefined) ? undefined : options.extent.join(',') + ',' + options.srid,
                filter: options.filter
            },
            dataType: 'jsonp',
            jsonp: 'format_options',
            jsonpCallback: 'callback:' + options.callback
        });

    }

</script>
</body>
</html>

复制代码

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

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

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