-
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 client-side queries 的所有 available fields 的要素幾何和值或服務器端查詢圖層中的所有字段。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 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
以下是所在類或對象的基本信息。
AMD:
require(["esri/layers/FeatureLayer"], (FeatureLayer) => { /* code goes here */ });
ESM:
import FeatureLayer from "@arcgis/core/layers/FeatureLayer";
類:
esri/layers/FeatureLayer
繼承: FeatureLayer > Layer > Accessor
自從:用於 JavaScript 4.0 的 ArcGIS API
用法說明
FeatureLayer.createQuery
函數(或屬性)的定義如下:
相關用法
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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 FeatureLayer.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。