-
createQuery
()
{Query}
创建查询参数对象,该对象可用于获取满足图层配置的要素,例如definitionExpression、gdbVersion和historyMoment。它将根据图层的数据函数返回
Z
和M
值。它将查询参数的 outFields 属性设置为["*"]
。结果将包括 client-side queries 的所有 available fields 的要素几何和值或服务器端查询图层中的所有字段。返回:
类型 说明 Query 表示图层定义表达式和其他配置的查询对象。 例子:
// this snippet shows the query parameter object that is returned // from FeatureLayer.createQuery(). const queryParams = new Query(); const dataCapabilities = layer.get<DataCapabilities>("capabilities.data"); queryParams.gdbVersion = layer.gdbVersion; queryParams.historicMoment = layer.historicMoment; queryParams.returnGeometry = true; if (dataCapabilities) { if (dataCapabilities.supportsZ && layer.returnZ != null) { queryParams.returnZ = layer.returnZ; } if (dataCapabilities.supportsM && layer.returnM != null) { queryParams.returnM = layer.returnM; } } queryParams.outFields = ["*"]; queryParams.where = layer.definitionExpression || "1=1"; queryParams.multipatchOption = layer.geometryType === "multipatch" ? "xyFootprint" : null;
// Get a query object for the layer's current configuration // queryParams.outFields will be set to ["*"] to get values // for all available fields. const queryParams = layer.createQuery(); // set a geometry for filtering features by a region of interest queryParams.geometry = extentForRegionOfInterest; // Add to the layer's current definitionExpression queryParams.where = queryParams.where + " AND TYPE = 'Extreme'"; // query the layer with the modified params object layer.queryFeatures(queryParams).then(function(results){ // prints the array of result graphics to the console console.log(results.features); });
基本信息
以下是所在类或对象的基本信息。
AMD:
require(["esri/layers/FeatureLayer"], (FeatureLayer) => { /* code goes here */ });
ESM:
import FeatureLayer from "@arcgis/core/layers/FeatureLayer";
类:
esri/layers/FeatureLayer
继承: FeatureLayer > Layer > Accessor
自从:用于 JavaScript 4.0 的 ArcGIS API
用法说明
FeatureLayer.createQuery
函数(或属性)的定义如下:
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注:本文由纯净天空筛选整理自arcgis.com大神的英文原创作品 FeatureLayer.createQuery。非经特殊声明,原始代码版权归原作者所有,本译文未经允许或授权,请勿转载或复制。