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arcgis api for js入门开发系列四地图查询(含源代码)

2024-08-21 12:55:14   222人阅读

备注：由于实现本篇功能的需求，修改了地图数据的dlsearch.mxd，然后更新了地图服务，需要的在文章最后有提供最新的mxd以及源代码下载的

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：

技术分享

技术分享

空间查询效果图：

技术分享

 

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：

技术分享

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" onm ouseover="DCI.Poi.onPOIMouseOverRecord(‘ + i + ‘,\‘‘ + tempID + ‘\‘)" onm ouseout="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="http://www.mamicode.com/‘ + 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" onm ouseover="DCI.Poi.onPOIMouseOverRecord(‘ + i + ‘,\‘‘ + tempID + ‘\‘)" onm ouseout="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="http://www.mamicode.com/‘ + 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：

技术分享

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" onm ouseover="DCI.SpatialQuery.onPOIMouseOverRecord(‘ + i + ‘,\‘‘ + tempID + ‘\‘)" onm ouseout="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="http://www.mamicode.com/‘ + 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" onm ouseover="DCI.SpatialQuery.onPOIMouseOverRecord(‘ + i + ‘,\‘‘ + tempID + ‘\‘)" onm ouseout="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="http://www.mamicode.com/‘ + 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");        }    }

 

 最后，提供源代码下载：http://pan.baidu.com/s/1eRCoH02

 dlsearch.mxd下载：http://pan.baidu.com/s/1qYRJGKG

arcgis api for js入门开发系列四地图查询(含源代码)


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