Questions tagged [angular-2+]
Use this tag on posts involving code written with versions 2 & above of Angular, the web framework from Google. Use the 'angular.js' tag for posts involving the older AngularJS (1.x) framework.
168
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109
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Idle/inactivity tracking with RXJS
I needed to implement a way to track idle state / inactivity in a browser (Angular app), so I tried to create an observable that would trigger whenever there wasn't any user-interaction event, so the ...
- 61
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33
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Are there any implications of calling the same function recursively within a switchMap operator in RxJS?
In the code below, startFlow$ function that takes an input request object and subscribes to open a dialog/popup that performs a certain operation.
Once the popup is ...
- 101
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62
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Angular Lazy Loading Component into HTML template
I want create a generic component for lazy loading other component
Demo online (click on load button)
https://stackblitz.com/edit/angular-v7xfwb
this is the code
...
- 201
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1
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118
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Check if string starts with vowel
I am using a template for a text inputs and feedback messages to simplify my html code. This passes in variable string called label and populates the placeholder ...
- 103
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149
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Set-new-password form, including validation
I've got to make a form using Bootstrap and Angular, which validates the following requirements:
Old password, new password and confirm password are mandatory fields.
New password has to be equal ...
- 4,212
2
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144
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Angular: ViewModel for safe two-way binding & MVVM
Introduction: Any angular dev should know that Angular tends to provide multiple ways of doing things. When it comes to forms, I tend to prefer to rely on forms of the template-driven variety, and ...
- 121
-1
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1
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35
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A better way to write if this then this = this / number or * number [closed]
Im wondering if there is a better way to write these expressions in Angular 13, They dont fit most of my more senior compatriots code, And i'd like to not add messy conditionals if not needed. They ...
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73
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Consecutive permission checks: forkjoin of calls made from an array of objects requiring 2 consecutive checks in backend, results in nested Observable
Bad Practice: Nested Observables
I could use some help with preventing nested Observables, by using higher order ones somehow.
I have some starting data (expected ...
- 229
3
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1
answer
140
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Angular - Contact manager component with API
I am starting with the Angular and I need some support. I have watched some of the tutorials and lot of them are using things differently. I upgraded some tutorial with my own idea, but I am not sure ...
- 131
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1
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31
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Validating with both a field validator and a form valdator
This (minimal demo) code obviously works, but I am a bit taken aback by the hoops I needed to jump through (and little to no mention in Angular (v13) documentation about the technique). I'm still ...
- 153
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1
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110
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Convert from get response to array of type
I would like to know if this is the best/most efficient/industry standard way of converting from the http response to an array of typed values:
Type class:
...
- 157
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1
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64
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Simple refactor of value changes typescript
Hello all I am using some typescript reactive forms, like this
...
- 250
-1
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1
answer
850
views
If condition in combineLatest observables [closed]
I have many observables so I use combineLatest in RxJS. After get all results I need to check one of value by using if condition. If the condition meets then call ...
- 369
1
vote
1
answer
72
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Typescript error handler
I wrote a function in Typescript which takes required parameters, optional parameters and parameters with default value. I want to use this function for error handling of http requests. I am not sure, ...
- 13
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1
answer
2k
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Custom RxJS operator to prevent duplicate API calls in Angular
I have a usecase where I want to prevent unexpected duplicate Http calls. I'm wondering if I can have a custom operator which can be used in pipe for any API as shown in below ...
- 61
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1
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177
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Should I use standalone service for angular custom APP_INITIALIZER
I'm working on a Angular Electron application where we display loading screen while the application is starting up. This means we have to do couple of BE requests and only remove the loader when we ...
- 113
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1
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694
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Angular and Typescript page with for loop and array
I have a page that shows the result of a quiz and depends on the number of right answer, the user get some rewards. So, if the user get just one right answer, he will get one reward, the others will ...
- 173
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409
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The proper way of creating a wrapper component for the Angular Material mat-list-option component
For an angular project I need a customized version of the mat-list-option component.
I've found a solution by creating my own component and using ...
- 11
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882
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My implementation of the Signal protocol for end-to-end encryption in NodeJS and Angular [closed]
I have developed a web app which lets you transfer files from A device to B device, similar to airdrop's concept, working through the server and not peer-to-peer.
I didn't go with a P2P solution ...
- 127
1
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1
answer
98
views
Sort an object array with two variable based on the language
I'm trying to sort a Sector array and a Province array based on the language.
sector.ts:
<...
- 111
0
votes
1
answer
103
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Hidden html elements after search click
I want to:
Hide areas of my template after search click.
Return its original state with the cleaning of the input related to each button.
I don't know if my code exploits all the resources of ...
- 47
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1
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57
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4
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2
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121
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Are there technical issues/disavdantages on this BaseService that aims to simplify calling API endpoints
I have created an angular BaseService that aims to simplify calling API endpoints
I would like to know if you see any code smells, bad patterns or architecture issues.
What disadvantages could this ...
0
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1
answer
338
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Unit Test case for services method in angular
I want to write the test case for Service class.
My Service Class dynamic-form.service.ts
...
2
votes
1
answer
167
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Rxjs search in Angular
I created an rxjs search for a hiring company, but I got rejected for the following reason:
-performance issue on a bigger data set.
-bugs
My question is how can I make this code better for the next ...
- 21
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1
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247
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RxJs - Flat nested swithMaps and pass variables on Http interceptor
How can the following method be flattened? I tried to pipe all the operators to the first pipe (from(this.fireAuth.currentUser)) but I lost access to the previous ...
0
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2
answers
54
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Verify application configuration from JSON file with matching type using TypeScript in an Angular project
To bootstrap our application we have a configuration stored in a JSON file. This config holds different settings, like definition of endpoints (e. g. an API or SMS gateway etc.) or some default values ...
- 245
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33
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Is there a better way for this ui component?
I need to create a component for displaying a list of avatar users....If the users present in the array is more then 3 I have to display a number to indicate the remaining amount of users.
Example:
<...
- 111
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votes
1
answer
898
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Handling a spinner for multiple REST calls
Context
In an Angular application, I have three <select> boxes that are fed from the database with a relatively small data set. These boxes are part of a ...
2
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0
answers
93
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1
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1
answer
70
views
Is it possible to make a re-usable icon component that doesn't create duplicate TemplateRefs
I have attempted to create an IconComponent that shows a different SVG icon depending on the string that is passed in.
Example:
...
- 113
0
votes
1
answer
58
views
Refactor dynamic filter functions
I create this menu filter component:
with this menu, in practice, you can filter on a cards list feeling free to choose different filters at the same time; the cards list returned will be the results ...
- 3
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votes
1
answer
55
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Angular observables piping
I wanted to check and see if this was as efficient as can be. The goal is to get a user's data from a group of documents that contains references to users in Firestore.
ngOnInit
...
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4
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2
answers
2k
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Angular10 RxJS - Interceptor to add/refresh JWT Token
I have a project, for which I use Tokenauthentication with JWT Tokens. I am relatively new to Angular Development and rxjs in particular, so there are a lot of concepts I am likely not yet familiar ...
- 505
3
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1
answer
532
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How to approach separation of layers mapping response to model in Angular app?
I want to organize mapping for my Angular app so that code structure would clear for other developers and I want to have as less code as possible.
I have an api service that is responsible for ...
- 133
2
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1
answer
2k
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Rewrite BehaviorSuject that takes either localStorage or Observable in Angular
I have this code
...
- 207
4
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2
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321
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Angular Frontend login logic
This is a follow-up to this question Node.js backend login logic. I wrote the following login Angular frontend logic for my Node.js Backend (see the previous question above). Is it any good in terms ...
- 195
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64
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The best way to handle many, different requests with custom query params
I have a list of products, I would like to filter that products e.g. by number, price, type etc. using checkboxes, selects and inputs. I get my data from REST API - using query params in GET method. ...
- 21
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238
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Storing localStorage data as part of rxjs reducer?
I use ngrx in my Angular app to state management. At a certain time I was asked to save some variable to local storage and retrieve it with first load.
That made ...
- 121
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67
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Is my Angular Material MessageBox component well build?
My angular knowledge is limited, so I don't know much yet about it's garbage collection etc to make sure my component can be used without any strange side effects or memory leaks.
I've created a ...
- 378
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23
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Simple Effects in Angular 2+ application using Firebase, NGRX and RXJS
Made an Angular app using Firebase, RXJS and NGRX.
...
- 299
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41
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3
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0
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30
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Alternative Way of comparing multiple variable's to multiple variables
Hi guys Im very very new To Angular/Typescript Im teaching my self section by section by just messing around and figuring things out.
Currently im just doing loop's and outputs so I decided to write a ...
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1
answer
54
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Iterating an Array Object & Assigning the Attributes Values to those that Match the Condition
Is there any approaches to reduce the below coding snippet in Angular 2+ with few lines of code by making use of ECMA Script or by some other ways
...
- 205
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38
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Switching article states using state pattern
The Article model supports a bunch of transitions. Only two are shown below: star()/unstar()....
- 121
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0
answers
1k
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RxJS - Prevent valueChange of one form control if another form group is dirty OR an HTTP error has occurred
I've recently started working on an Angular 7 project (I'm pretty new to Angular and RxJS), and I was requested to implement this new functionality:
The Problem
I have to implement a component to ...
sp814610
6
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1
answer
77
views
Code Refactoring for Dynamic List in Angular 8
With a specific requirement of showing/hiding the pages, the following implementation has been carried out.
The pages which needs to be hidden will be provided through an array
...
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2
votes
1
answer
33
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Javascript: Mapping combinations of input and possible suffix arrays leads to repetitive if statements
I am writing a program to combine the basic form of a word with suffix arrays following the choices from a form group (Angular 9) to receive the declination.
This is the flow:
The user inputs a word....
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167
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NativeScript - Angular Service to watch iOS keyboard event listeners
I'm writing an app with NativeScript 6.4.1 and Angular version 8.
There are a series of UI events in iOS that you can watch to see what the keyboard is doing:
https://developer.apple.com/...
- 121
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92
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Angular8 & RxJs: handling Observable in interceptor
the following tutorial uses an interceptor to show/hide a loading bar:
https://www.freakyjolly.com/http-global-loader-progress-bar-using-angular-interceptors/
...
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