- 自从:ArcGIS 适用于 JavaScript 4.19 的 API
一旦创建了类的实例,就可以利用
when()
。此方法采用两个输入参数:callback
函数和errback
函数。callback
在类实例加载时执行。errback
如果类的实例无法加载,则执行。参数:
类型 说明 callback Function可选的 当 promise 解决时调用的函数。
errback Function可选的 当 promise 失败时执行的函数。
返回:
类型 说明 Promise 为 callback
的结果返回一个新的承诺,该承诺可用于 chain 附加函数。例子:
// Although this example uses the BasemapGallery widget, any class instance that is a promise may use when() in the same way let bmGallery = new BasemapGallery(); bmGallery.when(function(){ // This function will execute once the promise is resolved }, function(error){ // This function will execute if the promise is rejected due to an error });
基本信息
以下是所在类或对象的基本信息。
AMD:
require(["esri/widgets/BasemapGallery"], (BasemapGallery) => { /* code goes here */ });
ESM:
import BasemapGallery from "@arcgis/core/widgets/BasemapGallery";
类:
esri/widgets/BasemapGallery
继承: BasemapGallery > Widget > Accessor
自从:用于 JavaScript 4.3 的 ArcGIS API
用法说明
esri/widgets/BasemapGallery.when
函数(或属性)的定义如下:
相关用法
- JavaScript esri/widgets/BasemapGallery.container用法及代码示例
- JavaScript esri/widgets/BasemapGallery.visible用法及代码示例
- JavaScript esri/widgets/BasemapGallery.headingLevel用法及代码示例
- JavaScript esri/widgets/BasemapGallery.source用法及代码示例
- JavaScript esri/widgets/BasemapGallery.on用法及代码示例
- JavaScript esri/widgets/BasemapGallery.classes用法及代码示例
- JavaScript esri/widgets/BasemapGallery/new BasemapGallery用法及代码示例
- JavaScript esri/widgets/BasemapGallery用法及代码示例
- JavaScript esri/widgets/BasemapLayerList.referenceListItemCreatedFunction用法及代码示例
- JavaScript esri/widgets/BasemapLayerList.baseListItemCreatedFunction用法及代码示例
- JavaScript esri/widgets/BasemapToggle.on用法及代码示例
- JavaScript esri/widgets/BasemapToggle用法及代码示例
- JavaScript esri/widgets/BasemapToggle toggle事件用法及代码示例
- JavaScript esri/widgets/BasemapLayerList.when用法及代码示例
- JavaScript esri/widgets/BasemapLayerList.on用法及代码示例
- JavaScript esri/widgets/BasemapToggle.container用法及代码示例
- JavaScript esri/widgets/BasemapLayerList用法及代码示例
- JavaScript esri/widgets/BasemapLayerList.visible用法及代码示例
- JavaScript esri/widgets/BasemapLayerList/new BasemapLayerList用法及代码示例
- JavaScript esri/widgets/BasemapToggle.classes用法及代码示例
- JavaScript esri/widgets/BasemapLayerList.multipleSelectionEnabled用法及代码示例
- JavaScript esri/widgets/BasemapToggle/new BasemapToggle用法及代码示例
- JavaScript esri/widgets/BasemapLayerList.container用法及代码示例
- JavaScript esri/widgets/BasemapLayerList.headingLevel用法及代码示例
- JavaScript esri/widgets/BasemapToggle.visible用法及代码示例
注:本文由纯净天空筛选整理自arcgis.com大神的英文原创作品 esri/widgets/BasemapGallery.when。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。