TimeInfo 提供诸如存储每个要素的start 和end 时间以及图层的fullTimeExtent 的日期字段等信息。
timeInfo
属性及其startField
和endField
属性必须在层初始化时设置,如果它是为从 client-side features 初始化的 CSVLayer 、 GeoJSONLayer 或 FeatureLayer 设置的.timeInfo
的 fullTimeExtent 是根据其startField
和endField
属性自动计算的。图层为 loaded 后,timeInfo 参数无法更改。默认值:null
例子:
// create geojson layer from usgs earthquakes geojson feed const geojsonLayer = new GeoJSONLayer({ url: "https://earthquake.usgs.gov/earthquakes/feed/v1.0/summary/all_month.geojson", copyright: "USGS Earthquakes", fields: [ { "name": "mag", "type": "double" }, { "name": "place", "type": "string" }, { "name": "time", "type": "date" }, // date field { "name": "depth", "type": "double" } ], // timeInfo can be used to do temporal queries // set the startField and endField. // timeExtent is automatically calculated from the // the start and end date fields // The date values must be in milliseconds number from the UNIX epoch specified in UTC. timeInfo: { startField: "time" } });
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.timeInfo
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.timeInfo。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。