Geoserver + Openlayers 拉框查詢

時間 2019-11-07

標籤 geoserver openlayers 查詢简体版

原文原文鏈接

1.代碼

<!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的版本號，高版本存在es6中新語法不兼容的狀況-->
    <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>查詢類型</label>
    <select id="type">
        <option value="None">None</option>
        <option value="Point">點擊</option>
        <option value="Polygon">多邊形</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',  //圖層名稱，能夠是單個或多個
        outputFormat: 'text/javascript',  //重點，不要改變
        format_options: 'callback:loadFeatures'  //回調函數聲明
    };

    var vectorSource = new ol.source.Vector({
        format: new ol.format.GeoJSON(),
        loader: function (extent, resolution, projection) {  //加載函數
            var url = 'http://192.168.1.113:8080/geoserver/map_dz/wms';
            $.ajax({
                url: url,
                data: $.param(wfsParams),   //傳參
                type: 'GET',
                dataType: 'jsonp',   //解決跨域的關鍵
                jsonpCallback: 'loadFeatures'  //回調

            });
        },
        strategy: ol.loadingstrategy.tile(new ol.tilegrid.createXYZ({
            maxZoom: 20
        })),
        projection: 'EPSG:4326'
    });
    //回調函數使用
    window.loadFeatures = function (response) {
        vectorSource.addFeatures((new ol.format.GeoJSON()).readFeatures(response));  //載入要素
    };
    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;//用於刪除以前的框，表示號，隨便取一個
    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);
            //刪除以前draw的部分
            draw.on('drawstart',function(evt) {
                var featureAdd=vectorLayer.getSource().getFeatureById(num);
                if(featureAdd!=null){
                    vectorLayer.getSource().removeFeature(featureAdd);
                }
            });
            //繪圖結束，處理選中部分
            draw.on('drawend',function(e){
                e.feature.setId(num);
                var geom=e.feature.getGeometry();
                var coor = geom.v;
                mapSelect(coor);
            });
        }
    }
    //選擇事件
    typeSelect.onchange = function() {
        value = typeSelect.value;
        map.removeInteraction(draw);
        addInteraction();
    };

    //draw圖像與原始數據相交
    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',//查詢的服務圖層名稱
            filter: FILTER,//查詢條件
            callback: 'getIdentifyroadGrid'//查詢的回調函數
        });
    }
    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層類型
                , title: '要素屬性'
                , shade: 0 //遮罩透明度
                , anim: 0 //0-6的動畫形式，-1不開啓
                , content: dataTable
                , offset: ['250px', '290px']
                , zIndex: 1
                , scrollbar: false
                , resize: false
                , skin: 'layui-layer-molv'
                , closeBtn: 2
                , btn: ["關閉"]
                , 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: '路線名稱', width: 150, align: 'center', sort: true},
                    {field: 'ldbm', title: '路線編號', width: 150, align: 'center', sort: true},
                    {field: 'lxbh', title: '路段編碼', width: 150, align: 'center', sort: true}
                ]]
            });
            layer.style(index, {
                opacity: 0.8
            });
        });

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

    //請求wfs數據
    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>

複製代碼

2.代碼解釋

這一部分是主要針對用戶作此功能的時候，遇到的問題進行總結javascript

在引入 Openlayers 的 JS 文件的時候，注意版本號，5.0+ 的版本中大量應用了ES6 的最新特性，若是直接引入 5.0+ ，可能與前期的項目有所衝突，因此這裏建議使用低版本，一樣能完成拉框查詢css

這裏主要經過 Draw 對象進行框選的，Draw 的本質是在圖層上興建 Shape ，那麼在下一次框選的時候，須要把上次 Draw 的框去掉：（回答了網上用戶的提問：openlayers 在從新畫圖(圓或矩形)如何清除以前的圖，Openlayer刪除上一次繪製的圖）html

首先記錄框選時，增長的框框的ID java

而後在下次框選以前，經過 id 找到上次那個 Feature，並刪掉

對選中的對象進行從新設置顏色，這裏主要經過 Style 屬性進行處理：jquery

在下次選中對象的時候，刪除上次選中對象的樣式將選中對象的 id 壓到數組彙總es6

在下次設置選中對象的樣式以前，遍歷數組，對上次選中的feature進行樣式設置（設置爲原來的樣式）ajax

3.結果

參考

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.htmljson

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