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Arcgis for Js之featurelayer实现空间查询和属性查询

2024-07-30 15:48:11   224人阅读

空间查询和属性查询是常用的两种对数据的检索与查询方式，在本节，将讲述Arcgis for Js下如何实现featurelayer的这两种查询方式，先贴图给大家看看：


实现界面


属性查询


空间查询

看完了效果，下面说说我的实现思路。

首先，实现查询的关键是Query，属性查询时query.where来实现，空间查询时query.geometry来实现，具体代码如下：

1、属性查询

            on(dom.byId("query"), "click", function(event){
                map.graphics.clear();
                var name = dom.byId("name").value;
                var query = new Query();
                query.where = "name = '"+name+"'";
                city.queryFeatures(query, function(results) {
                    var features = results.features;
                    console.log(features);
                    map.centerAndZoom(features[0].geometry,8);
                    var sms = new SimpleMarkerSymbol(SimpleMarkerSymbol.STYLE_DIAMOND,
                            10,
                            new SimpleLineSymbol(SimpleLineSymbol.STYLE_SOLID,
                                    new Color([0,0,0]),
                                    1
                            ),
                            new Color([255,0,0])
                    );
                    map.graphics.add(new Graphic(features[0].geometry,sms));
                });
            });
2、空间查询

            var draw = new esri.toolbars.Draw(map);
            draw.on("draw-end",addGraphicToMap);
            on(dom.byId("extent"), "click", function(event){
                map.graphics.clear();
                map.setMapCursor("pointer");
                draw.activate(esri.toolbars.Draw.EXTENT);
            });
            function addGraphicToMap(evt){
                map.setMapCursor("default");
                draw.deactivate();
                var sfs = new SimpleFillSymbol(SimpleFillSymbol.STYLE_SOLID,
                    new SimpleLineSymbol(SimpleLineSymbol.STYLE_DASHDOT,
                         new Color([255,0,0]),
                         2
                    ),
                    new Color([255,255,0,0.25])
                );
                map.graphics.add(new Graphic(evt.geometry, sfs));
                //根据空间进行查询
                var query = new Query();
                query.geometry = evt.geometry;
                city.selectFeatures(query, FeatureLayer.SELECTION_NEW, function(results){
                    console.log(results);
                    for(var i= 0,length=results.length;i<length;i++){
                        var sms = new SimpleMarkerSymbol(SimpleMarkerSymbol.STYLE_CIRCLE,
                            10,
                            new SimpleLineSymbol(SimpleLineSymbol.STYLE_SOLID,
                                new Color([255,0,0]),
                                1
                            ),
                            new Color([0,255,255,0.25])
                        );
                        results[i].symbol = sms;
                        city.redraw();
                    }
                });
                map.setExtent(evt.geometry.getExtent().expand(2));
            };

完整代码如下：

<!DOCTYPE html>
<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
    <meta name="viewport" content="initial-scale=1, maximum-scale=1,user-scalable=no"/>
    <title>Simple Map</title>
    <link rel="stylesheet" href=http://www.mamicode.com/"http://localhost/arcgis_js_api/library/3.9/3.9/js/esri/css/esri.css">>
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Arcgis for Js之featurelayer实现空间查询和属性查询


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