arcgis api for js入门开发系列四地图查询

by · 2018-10-25

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");
        }
    }

arcgis api for js3.x入门开发系列列表

  1. arcgis api离线部署
  2. 不同地图服务展示
  3. 地图工具栏
  4. 地图查询
  5. 地图态势标绘
  6. 地图分屏对比
  7. 图层控制
  8. 聚合效果
  9. 热力图效果
  10. 叠加SHP图层
  11. 地图统计图
  12. 地图打印（GP服务）
  13. 地图最短路径分析
  14. 最近设施点路径分析
  15. 台风轨迹
  16. 迁徙流动图
  17. 在线地图（天地图、百度地图、高德地图）
  18. 风向流动图
  19. 图层在线编辑
  20. 打印地图的那些事
  21. 气泡窗口信息动态配置模板

干货：

  1. 自写算法实现地图量算工具
  2. 自定义Navigation控件样式风格
  3. 热力图优化篇-不依赖地图服务
  4. 实现克里金插值渲染图–不依赖GP服务
  5. echarts开源js库实现地图统计图分析

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