with-context | Decorator for new React Context API | Architecture library
kandi X-RAY | with-context Summary
kandi X-RAY | with-context Summary
Decorator for new React Context API
Support
Quality
Security
License
Reuse
Top functions reviewed by kandi - BETA
Currently covering the most popular Java, JavaScript and Python libraries. See a Sample of with-context
with-context Key Features
with-context Examples and Code Snippets
Community Discussions
Trending Discussions on with-context
QUESTION
I found that in the official next.js example, state
and dispatch
were put info separate context providers.
What was the point of doing so? Does this practice prevent unnecessary re-renders?
...ANSWER
Answered 2021-May-23 at 07:06You do not need to put them in separate ContextProviders if almost all of your components are using both state and dispatch, just make sure that you are memoizing the argument you pass to the provider value when you pass them as a object. This way your consumers will only re-render when state actually changes. Also note that dispatch
instance doesn't actually change so there is no point in creating aa separate context for it
QUESTION
I have a follow up question to this: Test component with context and react hook
The top answer says, instead of creating a new context, use the AuthContext from context/AuthContext for , as that's the context that the hook uses.
I'm confused as to what this means exactly (would have left a comment, but don't have enough rep to comment yet)-- would someone be able to show it to me via code sandbox?
Thanks!
...ANSWER
Answered 2021-May-04 at 05:04It is simply saying to use the same React context that the custom hook/component is using, not some other "random" auth provider.
Example Auth Context:
QUESTION
i was wondering since both withContext and suspendCoroutine are suspend functions is there any difference betweeen them other then the fact that suspendCoroutine offers a continuation so you can control when it resumes or cancels if we use suspendCancellableCoroutine variation. I would say both can be used to stop making callbacks (which is one advantage of coroutines). is there any major difference ?
...ANSWER
Answered 2020-Jul-25 at 09:05Actually only suspendCoroutine
can be used to translate a callback-based API into coroutines. withContext
doesn't have the effect of suspending a coroutine, but temporarily changing its context (this is mainly about changing the dispatcher). The coroutine immediately continues in the other context and then comes back to the caller's context.
QUESTION
I have a general question on token-based authentication. I've seen multiple guides that seem to say conflicting things, so I'm confused:
QuestionWho should be responsible for creating the JWT, the app developer (via the app's backend server) or the auth server (ex. the Identity Provider)?
(1) Here [0], it explains that the developer needs to generate + hash the JWT and use that as the bearer token for any request. From there, the auth server can use the shared secret key to validate the token.
(2) Here [1], it says the auth server generates the JWT and returns it to the client once the login is provided + validated (no backend server involved on the developer's side).
Which one is correct? If they're both correct, how do I know which one to use?
My understanding:
(1) #1 above is one where the developer stores the secret in the backend server of their app. The backen serves as the middle man between the client and the auth server to make authenticated requests without exposing the secret + access token.
(2) #2 above is one where the app has no backend server at all (SPAs like Angular/React). The client interacts with the auth server directly (aka no secrets involved). Per [1], the IdP only uses the client ID, scope and few other things to generate a JWT.
[0] https://enable.cx.sap.com/media/1_uup99qpg (skip to 1:49)
[1] https://auth0.com/blog/handling-authentication-in-react-with-context-and-hooks/ (scroll down to the first block of code under "Add authentication to your app", where the Auth0 instance is configured)
...ANSWER
Answered 2020-Jul-12 at 22:15Depending on the project requirements/budget/timeline, the JWT can be created by the developer, or it can be managed by a third party (e.g. Auth0).
Terms Authentication Server- Receives user credentials (e.g. username & password)
- Validates user credentials (e.g. compare username's stored hashed password in the database to the result of hashing the password from the request)
- If token is valid, server responds with a token that is used to authenticate future requests (often automatically stored in a cookie in the client by passing it in the proper header in the auth server's response, which can then be automatically included with every request).
- Can be written from scratch (allowing for more customization), or can be handled by tools such as Auth0
This scenario involves making authenticated requests to a third party API.
- Your frontend accepts user credentials
- Your backend ("authentication server") validates credentials
- Your backend responds with a JWT token, created using the RSA Key from SAP, your User ID from SAP, and likely the User ID from your backend server so that you can ensure that the user making a request to authorized to access the data requested. NOTE: Auth0 can be used to create the token, if it supports storing and passing custom values to the JWT
- Your frontend makes a request to your backend, including the JWT
- Your backend ensures authorization (Auth0 can be used if it supports creating custom logic for checking authorization), then makes the relevant request (based on the request from the frontend) to the SAP server and passes both the JWT and the API Key (stored on your server) with the request
- SAP verifies the JWT, and responds to your backend with the requested data
- Your backend then passes the relevant data to your frontend
This scenario uses a third party auth server to authenticate/authorize routes on both your frontend and backend (both of which will leverage Auth0 tooling).
- Your frontend directs the user to Auth0's login page
- Auth0 redirects back to your frontend, where it stores the JWT
- When a user clicks on a button on your frontend that takes them to a different route (e.g. /profile), your frontend can use Auth0 to see if they are authenticated/authorized and extract relevant user data.
- When a user clicks on a button on your frontend that makes an API request to your backend, it sends the JWT token with the request, which your backend uses for authenticates using Auth0, and then responds with the relevant data (if the user is authorized to receive it).
QUESTION
I am pretty new to React Context API. What I am trying to do is set a loader when I perform an API call and stop the loader after an API call is done. But if I do these dispatch actions from helper function, I am getting an error:
...Invalid hook call. Hooks can only be called inside of the body of a function component. This could happen for one of the following reasons: 1. You might have mismatching versions of React and the renderer (such as React DOM) 2. You might be breaking the Rules of Hooks fix this problem.
ANSWER
Answered 2020-May-25 at 11:50You have two mistakes:
useContext(LoaderContext)
returns a tuple (with your implementation), so you need the setter function:
QUESTION
Im trying out an official yet simple example of Context-api as state manager from zeit and Im getting this type error that says "This expression is not callable. Type '{}' has no call signatures." when I try to call dispatch
from useDispatchViewer
because of my createcontext({})
is just an empty object? What does it need then? . You cant leave it empty like the example or typescript will yell at you.
ANSWER
Answered 2020-Apr-28 at 17:30After an intense session of googling , I found the answer here.
QUESTION
I have the following code:
...ANSWER
Answered 2020-Feb-26 at 18:41I believe you're just misreading your output.
QUESTION
I have multiple versions of an application where the executable has always the same name, just the file's path is different. When installing I would like to create a entry in the Open With... context menu and add the app's version to the label.
While this question here:
Name program in the Open With... context menu
is essentially the same, the answer only eludes to the situation where the executable has a different name for each version and by writing a string value called FriendlyAppName
into
ANSWER
Answered 2019-Dec-11 at 20:13While the above mentioned question seems to hint at the possibility to specify the FriendlyAppName
as a string, my tests didn't come to the right results and Microsoft's documentation seems to indicate that it needs to be a lookup into a file resource.
Hence my current "solution" is to write to the HKCR\Local Settings\Software\Microsoft\Windows\Shell\MuiCache
key and the associated value for my application as follows:
QUESTION
The documentation of withContext
states
Calls the specified suspending block with a given coroutine context, suspends until it completes, and returns the result.
However, the actual behavior is that it awaits on all the child coroutines as well, and doesn't necessarily return the result of the block but instead propagates any exception in the child coroutine.
...ANSWER
Answered 2019-Jul-06 at 19:42withContext
creates a new job. This means that all coroutines launched inside are children of this job. It only returns when the job is finished. Because of structured concurrency, it only finishes when all child coroutines are finished too.
When any of the child jobs fails, the parent job is canceled. This will also cancel all other child jobs. Since withContext
returns a result, the exception is thrown.
The documentation of CoroutineScope
is helpful in this regards:
Every coroutine builder (like launch, async, etc) and every scoping function (like coroutineScope, withContext, etc) provides its own scope with its own Job instance into the inner block of code it runs. By convention, they all wait for all the coroutines inside their block to complete before completing themselves, thus enforcing the discipline of structured concurrency.
I think the documentation of withContext
could be improved too. The documentation of Job
and CoroutineContext
are very helpful as they provide a more high-level point of view.
Furthermore, does that mean that we can use coroutineScope and withContext(coroutineContext) interchangeably, the only difference being a bit less boilerplate?
Yes, they should behave the same way. They are intended for different use cases though.
coroutineScope
is meant to provide a scope for multiple parallel coroutines in which all will be canceled, if any fails.
withContext
is designed to be used to switch the context (eg. the Dispatcher) for the given block of code.
Here is a similar question I recently asked on the kotlin discussion forums. The thread contains some more similar cases and further insight.
QUESTION
After quite a while of studying CL and practising as a hobby in different small projects, I still have some blank areas on my personal CL map. Recently, I had a number of functions using all the same let
construct and I thought of writing a macro which makes the code more concise:
ANSWER
Answered 2019-Jun-26 at 11:51You could put a macrolet
into your macro expansion:
Community Discussions, Code Snippets contain sources that include Stack Exchange Network
Vulnerabilities
No vulnerabilities reported
Install with-context
Support
Reuse Trending Solutions
Find, review, and download reusable Libraries, Code Snippets, Cloud APIs from over 650 million Knowledge Items
Find more librariesStay Updated
Subscribe to our newsletter for trending solutions and developer bootcamps
Share this Page