本文整理匯總了TypeScript中rxjs/Rx.Observable.withLatestFrom方法的典型用法代碼示例。如果您正苦於以下問題：TypeScript Observable.withLatestFrom方法的具體用法？TypeScript Observable.withLatestFrom怎麽用？TypeScript Observable.withLatestFrom使用的例子？那麽, 這裏精選的方法代碼示例或許可以為您提供幫助。您也可以進一步了解該方法所在類rxjs/Rx.Observable的用法示例。
在下文中一共展示了Observable.withLatestFrom方法的1個代碼示例，這些例子默認根據受歡迎程度排序。您可以為喜歡或者感覺有用的代碼點讚，您的評價將有助於係統推薦出更棒的TypeScript代碼示例。
示例1:
export function invokeCommand<TObj extends ReactiveObject, TArg, TResult>(source: Observable<TArg>, obj: TObj, command: string | ReactiveCommand<TArg, TResult>): Observable<TResult> {
var commandObservable: Observable<ReactiveCommand<TArg, TResult>>;
var canExecute: Observable<boolean>;
var isExecuting: Observable<boolean>;
if (typeof command === "string") {
// Make sure that the current command is observed
commandObservable = obj.whenSingle(command, true).map(e => e.newPropertyValue);
canExecute = commandObservable.map(c => c.canExecute).switch();
} else {
commandObservable = Observable.of(command);
canExecute = command.canExecute;
}
var results = source
.withLatestFrom(commandObservable, canExecute, (v1, command, canExecute) => {
return {
canExecute,
command,
observedValue: v1
};
})
.filter(o => o.canExecute && o.command != null)
.distinctUntilChanged()
.flatMap(o => {
return o.command.execute(o.observedValue);
});
return results;
}