redux | Predictable state container for JavaScript apps | State Container library
kandi X-RAY | redux Summary
kandi X-RAY | redux Summary
Redux is a predictable state container for JavaScript apps. (Not to be confused with a WordPress framework – Redux Framework). It helps you write applications that behave consistently, run in different environments (client, server, and native), and are easy to test. On top of that, it provides a great developer experience, such as live code editing combined with a time traveling debugger. You can use Redux together with React, or with any other view library. It is tiny (2kB, including dependencies), and has a rich ecosystem of addons.
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redux Examples and Code Snippets
Lines of Code : 86License : Permissive (MIT License)
Copyimport { normalize, schema } from 'normalizr'
import { camelizeKeys } from 'humps'
// Extracts the next page URL from Github API response.
const getNextPageUrl = response => {
const link = response.headers.get('link')
if (!link) {
return /* eslint-disable no-undef */
import React, { Component } from 'react'
import PropTypes from 'prop-types'
import { connect } from 'react-redux'
import { withRouter } from 'react-router-dom'
import { loadUser, loadStarred } from '../actions'
import U import React, { Component } from 'react'
import PropTypes from 'prop-types'
import { connect } from 'react-redux'
import { selectSubreddit, fetchPostsIfNeeded, invalidateSubreddit } from '../actions'
import Picker from '../components/Picker'
import P useEffect(() => {
// Specify how to clean up after this effect:
return function cleanup() {
// make redux call to toggle edit mode
};
});
function LoginButton(props) {
window.addEventListener('storage',event => {
if (event.key === 'logged-user') {
// update the redux store variable for login successful
}
});
const clickHandler = () => {
const backgroundModeRef = React.useRef(backgroundMode);
React.useEffect(() => {
backgroundModeRef.current = backgroundMode;
}, [backgroundMode]);
async function animate() {
...
// Does not receive updatefunction checkEmail(data,callback) {
return (dispatch) => {
return api_request
.post("register/check/email", { email: data })
.then((res) => {
// dispatch(emailExists(res.data.exists)); // You don't need this const mapStateToProps = (state) => ({
state: state // a "state" prop is available in the component which points to redux state,
})
const mapStateToProps = (state) => ({
state: state.event // import Constants from 'expo-constants';
import React, { useEffect } from 'react';
import { Text, View, FlatList, Button, StyleSheet } from 'react-native';
import { Provider, connect } from 'react-redux';
import { createStore, combineReducelet component;
beforeEach(() => {
let div = document.createElement('div');
const store = mockStore({
chosenCity: chosenCityReducer,
weatherForecast: chosenCityWeatherReducer
});
component = ReactDOM.render(
Community Discussions
Trending Discussions on redux
QUESTION
I'm newbie to Reactjs. The problem I'm encountered:
When Article page loads in the first time, all is fine and there are 10 articles shown. When I click on the browser back button, and then I go to the Article page for the second time, the article-list will be duplicated (so, it will be 20 articles). If I do so again, it will be 30 articles and so on ..
I want to know, why the result of API call appends for the Redux and not replace? In other word, how can I clean the Redux on page load every time? The expected result is seeing always 10 item (articles) on the page Article when I open it.
Here is a simplified of the element (for navigating to the list of articles) in the main page:
...ANSWER
Answered 2022-Apr-16 at 08:11case ReducerTypes.GET_ALL_POSTS:
return {
...state,
posts: {
items: action.payload.items,
pagination: action.payload.pagination
}
};
QUESTION
I have been stock on this error on my project when I add "proxy": "http://localhost:6000"
in my package.json.
This is the error response after yarn start.
Invalid options object. Dev Server has been initialized using an options object that does not match the API schema.
- options.allowedHosts[0] should be a non-empty string. error Command failed with exit code 1. info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.
But everything is fine when I remove the "proxy": "http://localhost:6000".
This is on my package.json:
...ANSWER
Answered 2021-Dec-19 at 16:06Here is a workaround. Delete "proxy": "http://localhost:6000". Install package http-proxy-middleware with command npm install http-proxy-middleware --save. Create a file setupProxy.js inside your src folder. Add these lines inside:
QUESTION
I have been using github actions for quite sometime but today my deployments started failing. Below is the error from github action logs
...ANSWER
Answered 2022-Mar-16 at 07:01First, this error message is indeed expected on Jan. 11th, 2022.
See "Improving Git protocol security on GitHub".
January 11, 2022 Final brownout.
This is the full brownout period where we’ll temporarily stop accepting the deprecated key and signature types, ciphers, and MACs, and the unencrypted Git protocol.
This will help clients discover any lingering use of older keys or old URLs.
Second, check your package.json dependencies for any git:// URL, as in this example, fixed in this PR.
As noted by Jörg W Mittag:
For GitHub Actions:There was a 4-month warning.
The entire Internet has been moving away from unauthenticated, unencrypted protocols for a decade, it's not like this is a huge surprise.Personally, I consider it less an "issue" and more "detecting unmaintained dependencies".
Plus, this is still only the brownout period, so the protocol will only be disabled for a short period of time, allowing developers to discover the problem.
The permanent shutdown is not until March 15th.
As in actions/checkout issue 14, you can add as a first step:
QUESTION
I just integrated to redux-toolkit . My goal is to store the result of the query getPosts in a slice, so I can use it across the site or change it.
My createApi is like this:
ANSWER
Answered 2021-Aug-01 at 21:27Let me preface this by: generally, you probably shouldn't.
RTK-Query is a full cache solution - so you should usually not copy state out of it in most solutions, but let RTK-Query keep control over that data.
If you want to change it, temporarily copy it over into local component state (this goes for all kind of form states by the way, you should not edit a form in-place in redux, but temporarily move it over to local component state), use a mutation to save it back to the server and then let RTKQ re-fetch that data to update the cache.
Wherever you need that data, just call useGetPostsQuery() and you're good - if that data is not yet fetched, it will get fetched, otherwise you will just get the value from cache.
Oh, bonus: you should not create an extra api per resource. You should have one single createApi call in your application in almost all cases - you can still split it up over multiple files using Code Splitting.
All that said, of course you can copy that data over into a slice if you have a good use case for it - but be aware that this way you now are responsible for keeping that data up-to-date and cleaning it up if you don't need it any more. Usually, RTKQ would do that for you.
Here is an example on how to clone data from a query over into a slice, taken from the RTKQ examples page:
QUESTION
Shaking the android device and hit Debug, and it crashes every time right away. From the Android Studio logcat, it shows No source URL loaded, have you initialised the instance?:
...ANSWER
Answered 2021-Dec-21 at 02:56After some more search arounds, found this is a known issue in react-native-reanimated. As their website points out
Please note that Reanimated 2 doesn't support remote debugging, only Flipper can be used for debugging.
Another github issue also pointed out this issue
This is expected, you can't use remote debugging with turbomodules (which Reanimated v2 is using). Check out Flipper to debug your app.
https://docs.swmansion.com/react-native-reanimated/docs/#known-problems-and-limitations
https://github.com/software-mansion/react-native-reanimated/issues/1990
Removing this library fixed the issue.
- Remove the react-native-reanimated dependency in package.json
- Remove related code in android's MainApplication.java
- yarn install or npm install
- Go to the ios folder and run
pod install - Go the the android folder and run
./gradlew clean - Rebuild the app.
yarn androidandyarn ios
Another alternative is to use Flipper for debugging instead.
QUESTION
It was working fine before I have done nothing, no packages update, no gradle update no nothing just created new build and this error occurs. but for some team members the error occur after gradle sync.
The issue is that build is generating successfully without any error but when opens the app it suddenly gets crash (in both debug and release mode)
Error
...ANSWER
Answered 2022-Feb-25 at 23:22We have fixed the issue by replacing
QUESTION
Because of Google Play, I had to update an old project of mine to the latest expo versions (version 43.0.0 to be exact). The idea is for the app to scan a QRCode and process the data, simply. However, expo-barcode-scanner only works once and after that I need to close and open the app again to work. Has anyone encountered this problem and (or) knows how to solve it? Below is my code:
...ANSWER
Answered 2021-Nov-12 at 21:14Welcome @Backup Gov18,
This is a documented issue.
Note: Only one active BarCodeScanner preview is supported currently. When using navigation, the best practice is to unmount any previously rendered BarCodeScanner component so the following screens can use without issues.
There is a workaround.
Instead of conditionally rendering the component, you could render it inside another dedicated screen component.
This way, after this new screen reads the barcode, you could navigate back to your first screen. Navigating back may unmount this new screen. You can force unmount if you need to.
As you are using react-navigation, you had better use .pop() instead of goBack().
You can also use expo-camera instead of expo-barcode-scanner. expo-camera does not have this issue. It also offers more options like flashlight/torch and switching cameras.
QUESTION
I am setting up the base for an app with MUI v5 and TypeScript. I want to extend the MUI theme with some custom properties which add to the existing default properties.
My theme.ts config looks like that:
...ANSWER
Answered 2021-Nov-17 at 14:12To update Typography variant in Typescript, use the following code:
QUESTION
I understand that React Testing Library has an example of testing with react router, but I couldn't get it to work (I think because I am using react router V6).
Basically, I need router testing because I have details component that uses useParams() to get part of the url. I can't render the component without it.
This was my attempt to make it work (yes the page also needs apollo, although it doesn't really need redux).
...ANSWER
Answered 2022-Jan-02 at 08:29QUESTION
My GitHub repo: https://github.com/safiullah7/legan
Branch: redux
I'm following this tutorial: https://tomanagle.medium.com/build-a-rest-api-with-node-js-typescript-mongodb-b6c898d70d61 and I'm unable to connect to my mongodb. Here's my code file where I'm trying to connect with the mongodb:
...ANSWER
Answered 2021-Aug-28 at 06:14The new version of mongoose (the latest version when I wrote this post is 6.0.2) has the following type definitions for the connect() function.
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