-
createQuery
()
{Query}
創建查詢參數對象,該對象可用於獲取滿足圖層配置的要素,例如definitionExpression、gdbVersion和historyMoment。它將根據圖層的數據函數返回
Z
和M
值。它將查詢參數的 outFields 屬性設置為["*"]
。結果將包括客戶端查詢的所有可用字段或服務器端查詢的圖層中的所有字段的要素幾何和值。返回:
類型 說明 Query 表示圖層定義表達式和其他配置的查詢對象。 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
以下是所在類或對象的基本信息。
AMD:
require(["esri/layers/SubtypeGroupLayer"], (SubtypeGroupLayer) => { /* code goes here */ });
ESM:
import SubtypeGroupLayer from "@arcgis/core/layers/SubtypeGroupLayer";
類:
esri/layers/SubtypeGroupLayer
繼承: SubtypeGroupLayer > Layer > Accessor
自從:用於 JavaScript 4.20 的 ArcGIS API
用法說明
SubtypeGroupLayer.createQuery
函數(或屬性)的定義如下:
相關用法
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- JavaScript ArcGIS SubtypeGroupLayer.formTemplate用法及代碼示例
- JavaScript ArcGIS SubtypeGroupLayer.definitionExpression用法及代碼示例
- JavaScript ArcGIS SubtypeGroupLayer.version用法及代碼示例
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注:本文由純淨天空篩選整理自arcgis.com大神的英文原創作品 SubtypeGroupLayer.createQuery。非經特殊聲明,原始代碼版權歸原作者所有,本譯文未經允許或授權,請勿轉載或複製。