until-destroy | 🦊 RxJS operator that unsubscribe from observables on destroy | Reactive Programming library
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kandi X-RAY | until-destroy Summary
RxJS operator that unsubscribe from observables on destroy
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QUESTION
It's surprisingly hard to get a straight answer on if and when you should unsubscribe from an Angular Observable.
I have the following scenario:
...ANSWER
Answered 2021-Nov-24 at 09:07You don't need to unsubscribe manually HTTP Observable and Router observable. Other than these two, any subject, or observable you create you have manually unsubscribe using one way you already mentioned, another way can be using async
operator.. The async operator automatically unsubscribes for you, also another way you can use takeUntil
operator
From https://stackoverflow.com/a/41177163/2987066
TLDR:
For this question there are (2) kinds of Observables - finite value and infinite value.
http Observables produce finite (1) values and something like a DOM event listener Observables produce infinite values.
If you manually call subscribe (not using async pipe), then unsubscribe from infinite Observables.
Don't worry about finite ones, RxJs will take care of them.
QUESTION
I have a simple component using ngx-editor. The html file is below:
...ANSWER
Answered 2021-Aug-25 at 10:44It's [(ngModel)], not [ngModel]. Remember: banana in a box.
QUESTION
Here's the package.json file:
...ANSWER
Answered 2021-Jul-13 at 07:57try yarn install
instead of npm install
To install yarn use below code
npm install --global yarn
QUESTION
I'm using the latest versions of all Angular-related packages (so Angular 10).
I want to add some code to a component, but I only want this code to exist in dev, never in a production build. It needs to be completely stripped in prod builds. I found this comment, which indicates that environments do this automatically (because they're const
).
I tried using that exact code in my app, but the dev code is still there in a production build. I copied the code over to a new test app that I made with ng new
, and it does work properly there.
What things should I be looking for, how can I fix this? Is this possibly because I have CommonJS dependencies, and if so, can I do anything about that (since I can't remove those dependencies)?
Some notes:
- An issue has been opened on the angular-cli repo here.
- The
environment
object is never written to anywhere in the codebase, I've searched thoroughly. (It's only used in a few places anyway.) - Code bounded with
if (false) { }
is properly stripped. - Removing the services export from the end of
environment{.prod}.ts
does not fix the problem. - Removing all CommonJS dependencies does not fix the problem.
Here's environment.prod.ts
(environment.ts
is the same, just with false
instead of true
):
ANSWER
Answered 2020-Aug-17 at 19:20You could apply the same logic as environment.ts
; create main.prod.ts
(without the dev specific code) and main.dev.ts
(with dev specific code), then use fileReplacements
in your config.
The config for prod would be:
QUESTION
For our pipeline we have two windows self-hosted agents installed on the same computer. Our main front-end pipeline .yml is listed below. This works fine except for some reason the npm install
doesn't get nx, or jest. To fix this we can just run npm install -g nx
and npm install -g jest
once in the pipeline for each agent. After the first run it is fine and we can remove the extra installs to speed up execution. However, it won't update when new versions of nx or jest are released and this definitely isn't best practices.
I am guessing the problem is that these need to be install globally to work so the regular npm install
can't achieve that. I included a slightly modified version of our package.json
which shows that nx (@nrwl) and jest are included in the package. Does anyone know a better way to install the nx and jest without reinstalling them each pipeline build and without removing install statements after the first run with a new agent? Thank you in advance for any suggestions, please let me know if I can provide any additional information.
ANSWER
Answered 2020-Nov-13 at 23:03Well if you want to keep your global tools up to date and avoid running those command each time when your pipeline runs, create a new scheduled pipeline to run it once per day and to update your global tools.
Here you have docs about scheduled triggers.
But it may look like this:
QUESTION
I am quite recent with angular (not to say noob) and I am strugling passing a standard Angular app to Angular Universal because of issues with Leaflet, I have found many exemples of projects working fine but there is no way that I manage to have it working the same way in my project. I managed to isolate the issue but i cannot solve it. I removed all references to leaflet in all the components and modules and just left the package.json as below :
...ANSWER
Answered 2020-Oct-11 at 15:32The error message is clear, it's because of your usage of the window object. You can identify the browser and execute the code only when inside the browser as follow:
QUESTION
I'm new using reactive forms in Angular akita and having a issue when setting response data to it. I defined a formControl group like below
...ANSWER
Answered 2020-Jul-22 at 14:08Since you have only one defined formGroup inside family formArray, you can't patch multiple value.
If you want to create family formArray based on JSON response, you can create array of formGroup like this:
component.ts
QUESTION
ANSWER
Answered 2020-May-29 at 14:02Try npm cache clean --force
and then reinstall using npm install
.
Hope it works! :)
QUESTION
Apologizes I am very new to typescript. I have two components and one service. One component uses a backend API to retrieve some numbers to display in a kendo-combobox. A search button has been implemented that takes the selected number in the combobox and makes another API call. My second component should then display the results of the second API call in a kendo-grid.
My problem is that my second screen does not log the results of the API (I'm using logging the API result to console for now).
Code Below:
Parent Component: ...ANSWER
Answered 2020-May-12 at 06:46I believe the problem is that in both the Panel Component and Child Component you have in the contructors:-
QUESTION
I'm using SSR application together with Contentful CMS with Route Resolver to fetch the data before loading the component. When I build and serve the application there's no error and I can see the content in the client side, but when I look the view-source, everything but the initial component with the Route Resolver is being rendered. When I remove the resolver and place some static elements inside of the component, then I see it in the view-source.
I have already implemented http interceptor for absolute urls and configured my server.ts properly, but still couldn't find the reason why it's not being rendered.
routes:
...ANSWER
Answered 2020-Mar-11 at 10:09So here's how I solved this issue after spending days trying different approaches. Somehow contentful library for angular wasn't working properly on SSR and using route resolver. So I moved the logic and calls to contentful to our proxy API (which is already taking care of other services calls). In this way I was able to use SSR and route resolver calling contentful through the proxy API. The proxy API is built in .NET core and deployed on Azure.
I don't know why this happens, but I hope this brings light for anyone going through similar issues with this or other similar libraries.
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