arcgis api for js入门开发系列四地图查询

上一篇实现了demo的地图工具栏,本篇新增地图查询功能,包括属性查询和空间查询两大块,截图如下:属性查询效果图

空间查询效果图:

谈核心代码实现之前,我大概的讲一讲arcgis for js的地图查询方式,一般来说,总共有三种查询方式:FindTask、IdentifyTask、QueryTask

(1)FindTask查询模式:基于关键字来模糊查询地图图层,属于文本型的,不能基于地图的设置的空间范围Geometry来查询,但是可以跨越多个图层来查询,比如餐饮图层、医疗服务图层等等;

(2)IdentifyTask查询模式:跟FindTask反过来,基于地图的设置的空间范围Geometry来查询,不能基于文本查询,同样可以跨越多个图层来查询;

(3)QueryTask查询模式:结合FindTask以及IdentifyTask一体,可以基于文本或者空间范围来查询,但是限定了查询图层,不能跨越多个图层来查询;

下面依据属性查询和空间查询不同思路来讲解一下核心实现模块,实现之前在map.js必须引入相关的调用api包:

(function () {
    dojo.require("esri.tasks.FindTask");
    dojo.require("esri.tasks.FindParameters");
    dojo.require("esri.tasks.IdentifyTask");
    dojo.require("esri.tasks.IdentifyParameters");
})();

一、属性查询模块:

1是基于FindTask属性查询的,可以查询的图层覆盖:餐饮、住宿、金融服务、购物、科研教育、医疗服务;2是基于QueryTask属性查询,分类查询;

FindTask属性查询实现核心代码:

 var find = new esri.tasks.FindTask(MapConfig.vecMapUrl + "/");//URL
 var params = new esri.tasks.FindParameters();
params.layerIds = [0,1,2,3,4,5]; //设置查询图层列表
params.searchFields = ["NAME"]; //设置查询图层的字段,根据NAME字段来模糊查询
params.searchText = keyword;//设置模糊查询的关键词
params.returnGeometry = true;//返回空间查询的geometry,方便把返回值结果以图标形式叠加在地图上
find.execute(params, DCI.Poi.findInfo);
/**
 * 所有图层的属性查询结果--FindTask
*/
    findInfo: function (results) {
        DCI.Poi.clearAndhide();
        var sms = new esri.symbol.PictureMarkerSymbol(getRootPath() + "Content/images/plot/point1.png", 11, 13);
        var innerStr = [];

        var featureCount = results.length;
        //最大的显示页面
        var maxpage = Math.ceil(featureCount / DCI.Poi.pageSize);
        if (results.length > 0) {
            $("#listpages").css({ display: "block" });
            for (var i = 0; i < DCI.Poi.pageSize; i++) {
                var rExtent = null;
                var iId = i + 1;
                var baseGraphicsymbol = new esri.symbol.PictureMarkerSymbol(getRootPath() + "Content/images/poi/dw" + iId + ".png", 25, 25);
                var infactItem = DCI.Poi.pageIndex * DCI.Poi.pageSize + i;
                var tempID = "tempID" + i;
                var pId = "poi_" + iId;
                if (results[infactItem] == undefined) //最后一页没有记录了 跳出循环
                    break;

                var attr = { "title": results[infactItem].feature.attributes.NAME, "content": results[infactItem].feature.attributes.NAME };
                var baseGraphic = new esri.Graphic(results[infactItem].feature.geometry, baseGraphicsymbol, attr);
                baseGraphic.id = tempID;
                DCI.Poi.graphicslayer.add(baseGraphic);

                innerStr.push('<div class="left_list_li_box" onmouseover="DCI.Poi.onPOIMouseOverRecord(' + i + ',\'' + tempID + '\')" onmouseout="DCI.Poi.onPOIMouseOutRecord(' + i + ',\'' + tempID + '\')"  id="' + pId + '">');
                innerStr.push('<div class="left_list_li_box_top">');
                innerStr.push('<div class="left2_box2">');
                innerStr.push('<img class="list_poi_marker" style="" src="' + getRootPath() + 'Content/images/poi/dw' + iId + '.png"></img>');
                innerStr.push('<div class="left_list_li1">');
                innerStr.push('<p>');
                innerStr.push('<a onclick="DCI.Poi.toLocationPOI(' + i + ',\'' + tempID + '\',\'' + results[infactItem].feature.attributes.NAME + '\')">' + results[infactItem].feature.attributes.NAME + '</a><br/>');
                innerStr.push('</p>');
                innerStr.push('</div>');
                innerStr.push('</div>')
                innerStr.push('</div>');
                innerStr.push('</div>');
            }
            $("#showLists").html(innerStr.join(''));

            //设置地图显示范围
            if (rExtent == null)
                rExtent = baseGraphic._extent;
            else {
                rExtent = rExtent.union(baseGraphic._extent);
            }

            DCI.Poi.map.setExtent(rExtent.expand(2));
            DCI.Poi.map.resize();
            DCI.Poi.map.reposition();
            //分页工具条        
            $("#listpages").PageOperator({
                containerID: "listpages",
                count: featureCount,
                pageIndex: DCI.Poi.pageIndex,
                maxPage: maxpage,
                callback: function (pageIndex) {
                    var keyword = $("#skeyword").val();
                    DCI.Poi.pageIndex = pageIndex;
                    DCI.Poi.search(keyword, pageIndex, DCI.Poi.pageSize);
                }
            });
        } else {
            alert("搜索不到相关数据");
        }
    }

QueryTask属性查询实现核心代码:

var query = new esri.tasks.Query();
query.returnGeometry = true;
query.outFields = ["NAME"];
query.where = "1=1";
queryTask = new esri.tasks.QueryTask(typeUrl);
queryTask.execute(query, DCI.Poi.navInfo);
    /**
     * 指定图层的属性查询--Query
    */
    navInfo: function (results) {
        DCI.Poi.clearAndhide();
        var sms = new esri.symbol.PictureMarkerSymbol(getRootPath() + "Content/images/plot/point1.png", 11, 13);
        var innerStr = [];

        var featureCount = results.features.length;
        //最大的显示页面
        var maxpage = Math.ceil(featureCount / DCI.Poi.pageSize);
        if (results.features.length > 0) {
            $("#listpages").css({ display: "block" });
            for (var i = 0; i < DCI.Poi.pageSize; i++) {
                var rExtent = null;
                var iId = i + 1;
                var baseGraphicsymbol = new esri.symbol.PictureMarkerSymbol(getRootPath() + "Content/images/poi/dw" + iId + ".png", 25, 25);
                var infactItem = DCI.Poi.pageIndex * DCI.Poi.pageSize + i;
                var tempID = "tempID" + i;
                var pId = "poi_" + iId;
                if (results.features[infactItem] == undefined) //最后一页没有记录了 跳出循环
                    break;

                var attr = { "title": results.features[i].attributes.NAME, "content": results.features[i].attributes.NAME };
                var baseGraphic = new esri.Graphic(results.features[infactItem].geometry, baseGraphicsymbol, attr);
                baseGraphic.id = tempID;
                DCI.Poi.graphicslayer.add(baseGraphic);

                innerStr.push('<div class="left_list_li_box" onmouseover="DCI.Poi.onPOIMouseOverRecord(' + i + ',\'' + tempID + '\')" onmouseout="DCI.Poi.onPOIMouseOutRecord(' + i + ',\'' + tempID + '\')"  id="' + pId + '">');
                innerStr.push('<div class="left_list_li_box_top">');
                innerStr.push('<div class="left2_box2">');
                innerStr.push('<img class="list_poi_marker" style="" src="' + getRootPath() + 'Content/images/poi/dw' + iId + '.png"></img>');
                innerStr.push('<div class="left_list_li1">');
                innerStr.push('<p>');
                innerStr.push('<a onclick="DCI.Poi.toLocationPOI(' + i + ',\'' + tempID + '\',\'' + results.features[infactItem].attributes.NAME + '\')">' + results.features[infactItem].attributes.NAME + '</a><br/>');
                innerStr.push('</p>');
                innerStr.push('</div>');
                innerStr.push('</div>')
                innerStr.push('</div>');
                innerStr.push('</div>');
            }
            $("#showLists").html(innerStr.join(''));

            //设置地图显示范围
            if (rExtent == null)
                rExtent = baseGraphic._extent;
            else {
                rExtent = rExtent.union(baseGraphic._extent);
            }

            DCI.Poi.map.setExtent(rExtent.expand(2));
            DCI.Poi.map.resize();
            DCI.Poi.map.reposition();
            //分页工具条        
            $("#listpages").PageOperator({
                containerID: "listpages",
                count: featureCount,
                pageIndex: DCI.Poi.pageIndex,
                maxPage: maxpage,
                callback: function (pageIndex) {
                    var keyword = $("#skeyword").val();
                    DCI.Poi.pageIndex = pageIndex;
                    DCI.Poi.search(keyword, pageIndex, DCI.Poi.pageSize);
                }
            });
        } else {
            alert("搜索不到相关数据");
        }
    }

二、空间查询模块:

1是基于QueryTask空间查询,查询指定的餐饮图层;2是基于IdentifyTask空间查询,可以查询的图层覆盖:餐饮、住宿、金融服务、购物、科研教育、医疗服务;IdentifyTask空间查询实现核心代码:

    /**
     * 所有图层的空间查询--Identify
    */
    searchIdentify: function (geometry) {
        var identifyTask = new esri.tasks.IdentifyTask(DCI.SpatialQuery.spatialQuery.layerName);//URL
        var identifyParams = new esri.tasks.IdentifyParameters();
        identifyParams.tolerance = 3;//设置绘制框选图形范围的屏幕像素距离,这个值必须要设置,不然查询不到,我用官网在线例子的默认3
        identifyParams.returnGeometry = true;//返回空间查询的geometry,方便把返回值结果以图标形式叠加在地图上
        identifyParams.layerIds = [0, 1, 2, 3, 4, 5];//设置查询图层列表
        identifyParams.layerOption = esri.tasks.IdentifyParameters.LAYER_OPTION_ALL;//设置查询的模式,我设置了可以查询所有的图层,不管是否可见,其他的模式具体参照api:https://developers.arcgis.com/javascript/3/jsapi/identifyparameters-amd.html
        identifyParams.geometry = geometry;//设置绘制框选图形范围
        identifyParams.mapExtent = DCI.SpatialQuery.map.extent;//设置查询的地图当前范围,也是必须设置的
        identifyTask.execute(identifyParams, DCI.SpatialQuery.identifyInfo);
    },
    /**
     * 所有图层的空间查询获取结果--Identify
    */
    identifyInfo: function (results) {
        //清空graphiclayer
        DCI.SpatialQuery.graphicslayer.clear();
        DCI.SpatialQuery.map.infoWindow.hide();
        var sms = new esri.symbol.PictureMarkerSymbol(getRootPath() + "Content/images/plot/point1.png", 11, 13);
        var innerStr = [];
        var featureCount = results.length;
        if (results == null || featureCount == 0) {
            DCI.Poi.addSearchErrorPage("queryshowList");
            $("#querylistpage").css({ display: "none" });
            return;
        }
        //最大的显示页面
        var maxpage = Math.ceil(featureCount / DCI.SpatialQuery.pageSize);
        $("#querylistpage").css({ display: "block" });
        if (results.length > 0) {
            for (var i = 0; i < DCI.SpatialQuery.pageSize; i++) {
                var rExtent = null;
                var iId = i + 1;
                var baseGraphicsymbol = new esri.symbol.PictureMarkerSymbol(getRootPath() + "Content/images/poi/dw" + iId + ".png", 25, 25);
                var infactItem = DCI.SpatialQuery.pageIndex * DCI.SpatialQuery.pageSize + i;
                var tempID = "tempID" + i;
                var pId = "poi_" + iId;
                if (results[infactItem] == undefined) //最后一页没有记录了 跳出循环
                    break;
                var attr = { "title": results[infactItem].feature.attributes.NAME, "content": results[infactItem].feature.attributes.NAME };
                var baseGraphic = new esri.Graphic(results[infactItem].feature.geometry, baseGraphicsymbol, attr);
                baseGraphic.id = tempID;
                DCI.SpatialQuery.graphicslayer.add(baseGraphic);
                innerStr.push('<div class="left_list_li_box" onmouseover="DCI.SpatialQuery.onPOIMouseOverRecord(' + i + ',\'' + tempID + '\')" onmouseout="DCI.SpatialQuery.onPOIMouseOutRecord(' + i + ',\'' + tempID + '\')"  id="' + pId + '">');
                innerStr.push('<div class="left_list_li_box_top">');
                innerStr.push('<div class="left2_box2">');
                innerStr.push('<img class="list_poi_marker" style="" src="' + getRootPath() + 'Content/images/poi/dw' + iId + '.png"></img>');
                innerStr.push('<div class="left_list_li1">');
                innerStr.push('<p>');
                innerStr.push('<a onclick="DCI.SpatialQuery.toLocation(' + i + ',\'' + tempID + '\',\'' + results[infactItem].feature.attributes.NAME + '\')">' + results[infactItem].feature.attributes.NAME + '</a><br/>');
                innerStr.push('</p>');
                innerStr.push('</div>');
                innerStr.push('</div>')
                innerStr.push('</div>');
                innerStr.push('</div>');
            }
            $("#queryshowList").html(innerStr.join(''));

            //设置地图显示范围
            if (rExtent == null)
                rExtent = baseGraphic._extent;
            else {
                rExtent = rExtent.union(baseGraphic._extent);
            }

            DCI.SpatialQuery.map.setExtent(rExtent.expand(2));
            DCI.SpatialQuery.map.resize();
            DCI.SpatialQuery.map.reposition();
            //分页工具条        
            $("#querylistpage").PageOperator({
                containerID: "querylistpage",
                count: featureCount,
                pageIndex: DCI.SpatialQuery.pageIndex,
                maxPage: maxpage,
                callback: function (pageIndex) {
                    DCI.SpatialQuery.pageIndex = pageIndex;
                    if (DCI.SpatialQuery.type[0] == "0") {//指定图层的空间查询
                        DCI.SpatialQuery.searchSP(DCI.SpatialQuery.sgeometry);
                    } else if (DCI.SpatialQuery.type[0] == "1") {//所有图层的空间查询
                        DCI.SpatialQuery.searchIdentify(DCI.SpatialQuery.sgeometry);
                    }
                }
            });
        } else {
            alert("搜索不到相关数据");
        }
    },

QueryTask空间查询实现核心代码:

    /**
     * 指定图层的空间查询--Query
    */
    searchSP: function (geometry) {
        var queryTask = new esri.tasks.QueryTask(DCI.SpatialQuery.spatialQuery.layerName);//URL
        var query = new esri.tasks.Query();
        query.returnGeometry = true;//返回空间查询的geometry,方便把返回值结果以图标形式叠加在地图上
        query.outFields = [DCI.SpatialQuery.spatialQuery.returnFields];//设置返回值的字段
        query.geometry = geometry;//设置绘制框选图形范围
        queryTask.execute(query, DCI.SpatialQuery.navInfo);
    },
    /**
     * 所有图层的空间查询--Query
    */
    navInfo: function (results) {
        //清空graphiclayer
        DCI.SpatialQuery.graphicslayer.clear();
        DCI.SpatialQuery.map.infoWindow.hide();
        var sms = new esri.symbol.PictureMarkerSymbol(getRootPath() + "Content/images/plot/point1.png", 11, 13);
        var innerStr = [];
        var featureCount = results.features.length;
        if (results.features == null || featureCount == 0) {
            DCI.Poi.addSearchErrorPage("queryshowList");
            $("#querylistpage").css({ display: "none" });
            return;
        }
        //最大的显示页面
        var maxpage = Math.ceil(featureCount / DCI.SpatialQuery.pageSize);
        $("#querylistpage").css({ display: "block" });
        if (results.features.length > 0) {
            for (var i = 0; i < DCI.SpatialQuery.pageSize; i++) {
                var rExtent = null;
                var iId = i + 1;
                var baseGraphicsymbol = new esri.symbol.PictureMarkerSymbol(getRootPath() + "Content/images/poi/dw" + iId + ".png", 25, 25);
                var infactItem = DCI.SpatialQuery.pageIndex * DCI.SpatialQuery.pageSize + i;
                var tempID = "tempID" + i;
                var pId = "poi_" + iId;
                if (results.features[infactItem] == undefined) //最后一页没有记录了 跳出循环
                    break;
                var attr = { "title": results.features[i].attributes.NAME, "content": results.features[i].attributes.NAME };
                var baseGraphic = new esri.Graphic(results.features[infactItem].geometry, baseGraphicsymbol, attr);
                baseGraphic.id = tempID;
                DCI.SpatialQuery.graphicslayer.add(baseGraphic);
                innerStr.push('<div class="left_list_li_box" onmouseover="DCI.SpatialQuery.onPOIMouseOverRecord(' + i + ',\'' + tempID + '\')" onmouseout="DCI.SpatialQuery.onPOIMouseOutRecord(' + i + ',\'' + tempID + '\')"  id="' + pId + '">');
                innerStr.push('<div class="left_list_li_box_top">');
                innerStr.push('<div class="left2_box2">');
                innerStr.push('<img class="list_poi_marker" style="" src="' + getRootPath() + 'Content/images/poi/dw' + iId + '.png"></img>');
                innerStr.push('<div class="left_list_li1">');
                innerStr.push('<p>');
                innerStr.push('<a onclick="DCI.SpatialQuery.toLocation(' + i + ',\'' + tempID + '\',\'' + results.features[infactItem].attributes.NAME + '\')">' + results.features[infactItem].attributes.NAME + '</a><br/>');
                innerStr.push('</p>');
                innerStr.push('</div>');
                innerStr.push('</div>')
                innerStr.push('</div>');
                innerStr.push('</div>');
            }
            $("#queryshowList").html(innerStr.join(''));

            //设置地图显示范围
            if (rExtent == null)
                rExtent = baseGraphic._extent;
            else {
                rExtent = rExtent.union(baseGraphic._extent);
            }

            DCI.SpatialQuery.map.setExtent(rExtent.expand(2));
            DCI.SpatialQuery.map.resize();
            DCI.SpatialQuery.map.reposition();
            //分页工具条        
            $("#querylistpage").PageOperator({
                containerID: "querylistpage",
                count: featureCount,
                pageIndex: DCI.SpatialQuery.pageIndex,
                maxPage: maxpage,
                callback: function (pageIndex) {
                    DCI.SpatialQuery.pageIndex = pageIndex;
                    if (DCI.SpatialQuery.type[0] == "0") {//指定图层的空间查询
                        DCI.SpatialQuery.searchSP(DCI.SpatialQuery.sgeometry);
                    } else if (DCI.SpatialQuery.type[0] == "1") {//所有图层的空间查询
                        DCI.SpatialQuery.searchIdentify(DCI.SpatialQuery.sgeometry);
                    }
                }
            });
        } else {
            alert("搜索不到相关数据");
        }
    }

作者: GIS之家

GIS之家微信号:gishome;GIS之家拥有自己的GIS开发团队,均是高校GIS研究生,具备丰富的webgis开发项目工作经验,专注以及热爱研究webgis技术的团队

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