Questions tagged state

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AngularJS: TypeError: Cannot set property ‘accountTypeName’ of undefined

I’m building a form in angularjs to allow a user to create an account – this involves selecting a value from a lookup but I am getting the following error when I try and select an option from this: TypeError: Cannot set property ‘accountTypeName’ of undefined at CreateAccountController.selectAccountTypeName (create-account.component.ts:24) My html code is as follows: […]

By smose
Published
Categorized as angularjs, state Tagged ,

How are NgRx Selectors and Reducers pure functions?

According to the NgRx documentation Reducers and Selectors are pure functions. "Reducers are pure functions in that they produce the same output for a given input." "Because selectors are pure functions, the last result can be returned when the arguments match without reinvoking your selector function." Consider the following simple example export const AppState = […]

By Devesh Pradhan
Published
Categorized as angular, ngrx, pure-function, state Tagged , , ,

NGXS State shared children

I am having a problem , I have two portals , two states SMS and Email state They both have to use the CommunicationFilterState and CommunicationRecipientsState The two above are two different states which are passed as @State<SmsSettingsModel>({ name: ‘smsSettings’, defaults: { id: null, name: null, type: null, status: null, eventId: null, communicationFilter: { filters: […]

By Ady Kazuke
Published
Categorized as angular, frontend, ngxs, state, typescript Tagged , , , ,

Angular Dynamically created component are not maintaining their state

I’m trying to dynamically create multiple components which will be placed in a table. The current code achieves this goal, however reference to state seems to get messed up at the dynamically created component level. So when a component is clicked and we look inside the click handler, within the dynamically generated component, this.data shows […]

Angular component rerenders but it shouldnt

I have written my self a service, that provides an observable, that observers the media breakpoints and returns a value depending on the breakpoint. In my angular component I am calling a method with parameters in order to change the span of a column depending on screen breakpoint. The subscription function only fires when the […]

Angular component with observable rerender issue

I have written my self a service, that provides an observable, that observers the media breakpoints and returns a value depending on the breakpoint. In my angular component I am calling a method with parameters in order to change the span of a column depending on screen breakpoint. The subscription function only fires when the […]

Store pattern for game state in angular

I’m working on a web game built in Angular, using WebSockets to communicate to the backend. So far I’ve decided that the clients send "events" as needed, and the server sends back the "state", 10 times a second or so. On the client side, this is handled by a ConnectionService that components can consume. This […]

By yathern
Published
Categorized as angular, rxjs, state, store Tagged , , ,

Unable to patch the state with update to the store using NGXS. I keep seeing type error: cannot freeze

I’m working with a basic Angular 11 application which has authentication implemented (using AWS Cognito & Amplify). What I’m trying to do here is quite simple. I am using builtin AWS Amplify methods to do the authentication. I am using NGXS to store the auth related items like tokens, user info etc. import { State, […]

By RawCode
Published
Categorized as angular, angular11, javascript, ngxs, state Tagged , , , ,

NGRX remove element from normalized state

I’m trying to understand how to handle data deletion on a normalized data structure. Lets say I have a nested structure like: interface Item { id: string, name: string, foo: Foo[], …more } interface Foo { id: string, value: number, bar: Bar, …more } interface Bar { id: string, count: number, …more } example: const […]

By gorlock
Published
Categorized as angular, ngrx, state Tagged , ,

Angular Reactive Form with RxJS store for number input

I’m tying to understand how to properly build the RxJS based Store approach for handling states in my Angular application. Perhaps I’m missing something very simple. The example is as follows: I have Reactive Form bind to UI elements, where one of them is <input type="number"/>; I subscribe to myForm.valueChanges and update my store when […]

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