observable

问题 I've got an API call that I need to make multiple times as the API doesn't support requests for multiple items. What I have written so far ends up in an endless loop of sending GET requests to the server. I believe I don't understand the nature of Observables in the below example. My assumption is that each call in the while loop subscribes to a new single object and that when it is resolved it will be placed in the array. How can I modify the below code to achieve what I want? getSingle():

问题 This question already has answers here : Data returning from api call through service to component is an object and seems to need to be an Array for Angular (2 answers) Closed 2 years ago . Trying to display data in template HTML from a component to service call which calls and returns an API, but I'm getting this error ERROR Error: Cannot find a differ supporting object '[object Object]' of type 'object'. NgFor only supports binding to Iterables such as Arrays. HTML <li *ngFor="let item of

问题 I'm programming a little vocabulary trainer for my wife using JavaFX. Each word stores it's own statistic values like how often she encountered the word and how often she provided a correct answer. I've set up a TableView for that, but after a training session the stats won't update. The word objects themselves have the right values but they're just not shown in the TableView. Usually the TableView always displays the current values of on object due to the nature of ObservableList, right? Not

问题 I am trying to implement {N} telerik's UI RadListView. Here is their getting started guide, which I followed as a reference. I have setup the following XML layout : list.xml <StackLayout loaded="loaded" xmlns:lv="nativescript-telerik-ui/listview" xmlns="http://www.nativescript.org/tns.xsd"> <lv:RadListView items="{{ rankingsArray }}"> <lv:RadListView.listViewLayout> <lv:ListViewLinearLayout scrollDirection="vertical"/> </lv:RadListView.listViewLayout> </lv:RadListView> <lv:RadListView

问题 I must be missing something simple, but can't figure it out. I'm retrieving a bunch of lookup tables in 1 Web API call. return EntityQuery.from('Lookups') .noTracking(true) .using(manager).execute() .then(processLookups); In processLookups I'm calling getLocal for each array that was returned. Example: State table datacontext.lookups = { state: getLocal('States', orderBy.state, true), .... } function getLocal(resource, ordering, includeNullos) { var query = EntityQuery.from(resource) .orderBy

问题 I am using ap-fullcalendar for angular/typescript. I have a data service, where I get the events for the calendar from my database, I wrap the data in a Behaviour Subject and subscribe to it and make it into an observable from another function. I have a data service because I have multiple subscriptions to the same observable. In my component where the calendar is, I subscribe to the data. However, for some reason, the events are not getting passed properly to the calendar and won't show up.

问题 This question already has an answer here : Angular 5 - Observable return error cannot read property of undefined (1 answer) Closed last year . I have an object that I would like to use in a view component, PersistedWaitlist: export class PersistedWaitlist extends Waitlist implements Identifiable { private items: PersistedWaitlistItem[]; constructor(public readonly id: number, createdAt: Date, name: string) { super(createdAt, name); this.items = new Array(); } addItem(waitlistItem:

问题 I have an existing ComposePopupView() modelview which contains observable this.attachments = ko.observableArray([]); and a method below ComposePopupView.prototype.addDropboxAttachment = function (oDropboxFile) { var oAttachment = null, iAttachmentSizeLimit = Utils.pInt(Settings.settingsGet('AttachmentLimit')), mSize = oDropboxFile['bytes'] ; oAttachment = new ComposeAttachmentModel( oDropboxFile['link'], oDropboxFile['name'], mSize ); oAttachment.fromMessage = false; oAttachment.cancel = this

问题 If I use, 2 gets printed to the console every 3 seconds: Rx.Observable.interval(3000) .mergeMap(() => Rx.Observable.of(3)) .concatMap(()=>Rx.Observable.of(2).first(x=>x == 2)) .subscribe((x)=>console.log(x)) If I use, 2 gets printed to the console only one time: Rx.Observable.interval(3000) .mergeMap(() => Rx.Observable.of(3)) .concatMap(()=>Rx.Observable.of(2)) .first(x=>x == 2) .subscribe((x)=>console.log(x)) The difference is where I chained the first operator, but I don't understand the

问题 If I use, 2 gets printed to the console every 3 seconds: Rx.Observable.interval(3000) .mergeMap(() => Rx.Observable.of(3)) .concatMap(()=>Rx.Observable.of(2).first(x=>x == 2)) .subscribe((x)=>console.log(x)) If I use, 2 gets printed to the console only one time: Rx.Observable.interval(3000) .mergeMap(() => Rx.Observable.of(3)) .concatMap(()=>Rx.Observable.of(2)) .first(x=>x == 2) .subscribe((x)=>console.log(x)) The difference is where I chained the first operator, but I don't understand the