reactive | reactive component library for Preact / React | Frontend Framework library
kandi X-RAY | reactive Summary
kandi X-RAY | reactive Summary
Introduction | API Docs | CodeSandbox | Next.js Example | Examples. You are using React or Preact but find yourself frustrated by continuous bugs, errors or ceremony caused by the Hooks API? You thought you could avoid using a separate state management library like Redux, Recoil or MobX but started to run into unexpected performance issues with the Context API?. Then this library will eventually be the one for you! A reactive component model on top of React and Preact with automatic performance optimizations and a simple and predictable API that gets out of your way and supports you in achieving your goals. Blatantly copied from the fantastic Vue Composition API. But for React / Preact. Huh? Eventually? Oh yes, this thing is bleeding cutting edge and likely to cause you all kinds of pain right now. Please don't use this in production. We are looking for feedback and observations from experiments you run. We fully expect to change major parts of the API in various different ways while we try to find the right set of primitives and abstractions to have a good balance between power and ease of learning.
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QUESTION
When I create a ref
from an empty object and later add object properties, there is no reactivity:
ANSWER
Answered 2022-Mar-13 at 22:08Try to you update your ref object like
QUESTION
I got this below error when run the API-GATEWAY, I tried so many ways but I couldn't solve this issue.
Description:
Spring MVC found on classpath, which is incompatible with Spring Cloud Gateway.
Action:
Please set spring.main.web-application-type=reactive or remove spring-boot-starter-web dependency.
Main Class
...ANSWER
Answered 2021-Aug-01 at 06:17Please note that Spring Cloud Gateway is not compatible with Spring MVC (spring-boot-starter-web
). This is outlined in section "How to include Spring Cloud Gateway in the official reference documentation":
Spring Cloud Gateway is built on Spring Boot 2.x, Spring WebFlux, and Project Reactor. As a consequence, many of the familiar synchronous libraries (Spring Data and Spring Security, for example) and patterns you know may not apply when you use Spring Cloud Gateway.
Additionally, it is stated that:
Spring Cloud Gateway requires the Netty runtime provided by Spring Boot and Spring Webflux. It does not work in a traditional Servlet Container or when built as a WAR.
As already suggested by the error message, you would need to remove the dependency on spring-boot-starter-web
. You can list all your direct and transitive dependencies with the following command:
QUESTION
I've written and optimized a Shiny app, and now I'm struggling with the IT section of the organization where I work to have it published on their servers. Currently, they are claiming that the app is not W3C compliant, which is true, according to the W3C validator.
The errors I'm trying to solve, with no success, are:
Bad value “complementary” for attribute “role” on element “form”.The value of the “for” attribute of the “label” element must be the ID of a non-hidden form control.
Such errors can be seen also in very minimal shiny apps, like:
...ANSWER
Answered 2022-Mar-04 at 08:05The following only deals with the first of the errors you mention (as this one is pretty clear thanks to @BenBolkers comment), but hopefully it points you to the right tools to use.
I'd use htmltools::tagQuery to make the needed modifications - please check the following:
QUESTION
How to manage access to shared resources using Project Reactor?
Given an imaginary critical component that can execute only operation at the time (file store, expensive remote service, etc), how could one orchestrate in reactive manner access to this component if there are multiple points of access to this component (multiple API methods, subscribers...)? If the resource is free to execute the operation it should execute it right away, if some other operation is already in progress, add my operation to the queue and complete my Mono once my operation is completed.
My idea is to add tasks to the flux queue which executes tasks one by one and return a Mono which will be complete once the task in the queue is completed, without blocking.
...ANSWER
Answered 2022-Feb-23 at 10:26this looks like a simplified version of what the reactor-pool does, in essence. have you considered using that with eg. a maximum size of 1?
https://github.com/reactor/reactor-pool/
https://projectreactor.io/docs/pool/0.2.7/api/reactor/pool/Pool.html
The pool is probably overkill, because it has the overhead of having to deal with multiple resources on top of multiple competing borrowers like in your case, but maybe it could provide some inspiration for you to go further.
QUESTION
I am making an app which can generate plots from input and it has no problem showing it on the UI but when I try to zip it by putting them into a temporary directory using ggsave() and use zip(), it doesn't work.
The example I have here generated the plot file in the temporary directory, but no zip file was generated. There is an extra directory in the temp dir which makes me think it has tried the process but somehow stopped.
Here is my code:
...ANSWER
Answered 2022-Jan-05 at 09:51When running this on Windows make sure zip
works. See this related article and follow the procedure in section "Putting Rtools on the PATH".
The following works as intended:
QUESTION
I'm building a Shiny app in which I'm trying to implement a checkbox type filter.
In the input called phones
There is one option titled Yes
. When Yes
is ticked off, it will limit it to anyone in df
whose field for phone
IS NOT NA. When it's not checked off, it will include all fields under phone
regardless if its NA or not.
The error I get:
Warning: Error in : Problem with `filter()` input `..1`. ℹ Input `..1` is `&...`. x `input$phones == "Yes" ~ !is.na(temp_data$phone)`, `TRUE ~ !is.na(temp_data$phone) & is.na(temp_data$phone)` must be length 0 or one, not 10000
global.R:
...ANSWER
Answered 2021-Nov-30 at 19:19Instead of case_when
, it may be more appropriate to use if () else ()
. Also, when your prettyCheckboxGroup
is unchecked, the value is NULL
, and you need to handle that. Try this
QUESTION
I'm using localStorage to save user data on login. I've saved it named "jwt_data". I've created a function on saperate js file to retrieve that data as
...ANSWER
Answered 2021-Nov-07 at 18:04So you need useContext in this case.
In your app.js
QUESTION
I have a scenario like Need to edit the single quotes values (only single quotes values),
So I extracted the single quotes values using regex and prepare the reactive dynamic form.
onclick of performing edit button will show old step name above, new step name below, submit step will replace the step name in the original array.
WOrking fine as expected in few scenarios according to my approach, but in scenarios, I realized whatever algorithm I am following does not fulfill my requirement.
Below are the test cases
Test case 1: Step Name: "Then I should hire an employee using profile '1' for 'USA'", // Here --> '1', 'USA' values are editable
Test case 2: "And Employee should be hired on '01' day of pay period '01' of 'Current' Fiscal" // '01', '01', 'Current'
Issues: in test case 2 if I tried to edit second 01 it is editing the first 01
I try to solve the perform edit function with help of indexof, substring functions
...ANSWER
Answered 2021-Oct-03 at 08:48I added a function called matchStartingPositions that returns the starting position indexes of each match. Using this method you can then perform your edit by replacing the string just as you do, but we'll find the proper match to be replaced at the given position.
So in your line
QUESTION
I have a reactive pipeline to process incoming requests. For each request I need to call a business-relevant function (doSomeRelevantProcessing
).
After that is done, I need to notify some external service about what happened. That part of the pipeline should not increase the overall response time. Also, notifying this external system is not business critical: giving a quick response after the main part of the pipeline is finished is more important than making sure the notification is successful.
As far as I learned, the only way to run something in the background without slowing down the overall process is to subscribe to in directly in the pipeline, thus achieving a fire-and-forget mentality.
Is there a good alternative to subscribing inside the flatmap
?
I am a little worried about what might happen if notifying the external service takes longer than the original processing and a lot of requests are coming in at once. Could this lead to a memory exhaustion or the overall process to block?
ANSWER
Answered 2021-Sep-28 at 10:36I'm answering this assuming that you notify the external service using purely reactive mechanisms - i.e. you're not wrapping a blocking service. If you are then the answer would be different as you're bound by the size of your bounded elastic thread pool, which could quickly become overwhelmed if you have hundreds of requests a second incoming.
(Assuming you're using reactive mechanisms, then there's no need for .subscribeOn(Schedulers.boundedElastic())
as you give in your example, as that's not buying you anything - it's designed for wrapping legacy blocking services.)
Could this lead to a memory exhaustion
It's only a possibility in really extreme cases, the memory used by each individual request will be tiny. It's almost certainly not worth worrying about, if you start seeing memory issues here then you'll almost certainly be hit by other issues elsewhere.
That being said, I'd probably recommend adding .timeout(Duration.ofSeconds(5))
or similar before your inner subscribe method to make sure the requests are killed off after a while if they haven't worked for any reason - this will prevent them building up.
...or [can this cause] the overall process to block?
This one is easier - a short no, it can't.
QUESTION
I am trying integrating Firebase with Vue 4 application is currently getting the following error.
Uncaught TypeError: db__WEBPACK_IMPORTED_MODULE_1_.default.database is not a function
I am using "firebase": "^9.0.0" "vue": "^3.0.0"
...ANSWER
Answered 2021-Aug-31 at 13:32The new modular SDK does not use namespaces anymore. So you cannot use app.database()
. You can simply export a database instance from the file where you initialize Firebase as shown below:
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