-
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["*"]
。结果将包括客户端查询的所有可用字段或服务器端查询的图层中的所有字段的要素几何和值。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 SubtypeGroupLayer.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/SubtypeGroupLayer"], (SubtypeGroupLayer) => { /* code goes here */ });
ESM:
import SubtypeGroupLayer from "@arcgis/core/layers/SubtypeGroupLayer";
类:
esri/layers/SubtypeGroupLayer
继承: SubtypeGroupLayer > Layer > Accessor
自从:用于 JavaScript 4.20 的 ArcGIS API
用法说明
SubtypeGroupLayer.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 SubtypeGroupLayer.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。