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REACTJS QUESTIONS

Element type is invalid (got: undefined) for react-redux component
Element type is invalid (got: undefined) for react-redux component
I hope this helps . I'm trying to create a component for redux-form. Here is my component , Try to change:
TAG : reactjs
Date : November 25 2020, 11:01 PM , By : Jith Cr
React's setState(), data mutation for nested structures, why not modify state directly?
React's setState(), data mutation for nested structures, why not modify state directly?
it helps some times Creating an immutable clone of state is a good idea because of the way state changes are compared in order to optimise rendering.In lifecycle methods like shouldComponentUpdate, nextProps are passed in and can be compared to this.
TAG : reactjs
Date : November 24 2020, 11:01 PM , By : Anish Tamang
Dispatching an action in a specific component based on a reducer state change
Dispatching an action in a specific component based on a reducer state change
wish help you to fix your issue I wouldn't indeed call dispatch in the mapDispatchToProps function. This function should be "pure" and just return a mapping without any side effect. Since you know what action should trigger the modal ie. when publicS
TAG : reactjs
Date : November 23 2020, 11:01 PM , By : colin gomes
using React component library without @types
using React component library without @types
hop of those help? In TypeScript 2.1, unless you're using --noImplicitAny, you will be able to just use this library without declaration files (provided that it's installed).But since TS 2.1 isn't out yet, what you can do is create a file called exte
TAG : reactjs
Date : November 22 2020, 11:00 PM , By : CYHC
How to parse a string with variables into a react component?
How to parse a string with variables into a react component?
I hope this helps you . Use RegExp to identify all {} sets. Then, replace the value with the state value and update the string. Finally use dangerouslysetinnerhtml to insert the HTML string into react node. See the example.Hope this helps!
TAG : reactjs
Date : November 22 2020, 11:00 PM , By : Tico Wang
in React + Redux, when should use response.json()
in React + Redux, when should use response.json()
this one helps. It depends what you actually requesting and what you wants to do with the response.
TAG : reactjs
Date : November 21 2020, 11:01 PM , By : SpencerS
How to move reactjs components into seperate page when using CDN
How to move reactjs components into seperate page when using CDN
like below fixes the issue You will need webpack to transpile you components written in JSX to JS. Then you can import react like
TAG : reactjs
Date : November 21 2020, 11:01 PM , By : Sudath Bandara
create-react-app and d3 - Why is d3 undefined?
create-react-app and d3 - Why is d3 undefined?
I hope this helps . d3 is not a top level export, but you can import everything and save it to d3 namespace
TAG : reactjs
Date : November 20 2020, 11:01 PM , By : Danilo Preda
react-router tutorial not working on mac
react-router tutorial not working on mac
I wish this helpful for you Try to change the port to something else with the command webpack-dev-server --port 3000 --inline --content-baseYou can also substitute the npm start script in the package.json with that line.
TAG : reactjs
Date : November 20 2020, 11:01 PM , By : Y.Mharrek
Using lodash in shouldComponentUpdate
Using lodash in shouldComponentUpdate
I hope this helps . I had a similar experience building a calendar where every date contains async data. My recommendations:
TAG : reactjs
Date : November 20 2020, 11:01 PM , By : graphicdragon
Deploying build to production using express server which i compiled using webpack -p
Deploying build to production using express server which i compiled using webpack -p
may help you . You now need to serve the contents of your dist folder with express, here's a basic implementation which you can use as an example:Create a file named app.js in your . folder (in the same folder you dist folder is in)
TAG : reactjs
Date : November 19 2020, 11:01 PM , By : Adiel
How to write interceptor in react-redux?
How to write interceptor in react-redux?
this will help I would create a wrapper (interface) function for your 'request-promise' calls:
TAG : reactjs
Date : November 19 2020, 11:01 PM , By : user73990
XJS value should be either an expression or a quoted XJS text
XJS value should be either an expression or a quoted XJS text
will help you I am very new to programming, and started doing exercises I found , Okay, a couple of things:
TAG : reactjs
Date : November 19 2020, 11:01 PM , By : Nadine Allababidi
How to display 12months with material-ui
How to display 12months with material-ui
will be helpful for those in need This is not possible using material-ui. You can try https://github.com/BelkaLab/react-yearly-calendar
TAG : reactjs
Date : November 18 2020, 11:01 PM , By : Alexander the Drake
Reordering a sequence of objects in a normalised Redux data structure
Reordering a sequence of objects in a normalised Redux data structure
Hope that helps You could normalize a step further : Extract the sequence in a separate state slice and store the order as an array of ids.
TAG : reactjs
Date : November 17 2020, 11:01 PM , By : fckngstck
Markdown in React with Typescript
Markdown in React with Typescript
With these it helps I solved my problem by using commonmark package instead. They have typings and everything needed for my environment. Here is my implementation:
TAG : reactjs
Date : November 17 2020, 11:01 PM , By : Tomi Haldén
Is it an efficient practice to add new epics lazily inside react-router onEnter hooks?
Is it an efficient practice to add new epics lazily inside react-router onEnter hooks?
I wish this helpful for you In this case, would epic3 get added again to the rootEpic every time we navigate to /some-path?
TAG : reactjs
Date : November 16 2020, 11:00 PM , By : Edna Balongcas MAban
React: Execute some check before render
React: Execute some check before render
will help you I think componentWillMount() is literally what you are after but putting it in the constructor() might be a better place for it.
TAG : reactjs
Date : November 15 2020, 11:01 PM , By : Debbie Kirby
Set component's props dynamically
Set component's props dynamically
To fix the issue you can do The proper way is to use React's cloneElement method (https://facebook.github.io/react/docs/react-api.htmlcloneelement). You can achieve what you want by doing:
TAG : reactjs
Date : November 09 2020, 11:01 PM , By : Desmond Ellsworth
Webpack + Babel: Couldn't find preset "es2015" relative to directory
Webpack + Babel: Couldn't find preset "es2015" relative to directory
like below fixes the issue npm i or npm installshould install all the packages in your package.json dependencies and dev dependencies (so long as your NODE_ENV environment variable does not equal production).
TAG : reactjs
Date : November 06 2020, 11:01 PM , By : Narahari Battula
What is the right way to fire an action with siblings state in React/Flux?
What is the right way to fire an action with siblings state in React/Flux?
I wish this help you After reading a lot, reading a child's state using refs is the solution for this problem. You should not be modifying child's state or calling methods using refs.
TAG : reactjs
Date : November 03 2020, 11:01 PM , By : cyc
React-server failling without error
React-server failling without error
Does that help The issue was the route defined in routes.js was still pointing to a page that didn't exist anymore (page property). The route could not resolve.routes.js :
TAG : reactjs
Date : November 01 2020, 11:01 PM , By : Wahid
Add Server Side Rendering to create-react-app
Add Server Side Rendering to create-react-app
Any of those help If you need server side rendering, I would suggest Next.js instead of create-react-app: https://github.com/zeit/next.js/
TAG : reactjs
Date : November 01 2020, 01:04 PM , By : emert
Should I store static configuration in redux?
Should I store static configuration in redux?
I wish did fix the issue. My understanding of redux is that we should only be storing stateful data in the store, that is, data that is subject to change. Static data by definition does not have state, and therefore does not need to be tracked as suc
TAG : reactjs
Date : November 01 2020, 01:04 PM , By : Hassan Vahedi
State is not updating in componentWillMount
State is not updating in componentWillMount
wish help you to fix your issue If you want to perform any asynchronous requests, I suggest you perform them in the componentDidMount lifecycle method. This is the suggested path based on the Reactjs documentation for componentDidMount.
TAG : reactjs
Date : November 01 2020, 12:01 AM , By : jjk67
How to envoke a method on a react component (Amcharts-React)
How to envoke a method on a react component (Amcharts-React)
wish helps you The amchart3-react component sets the chart as a state. Thus the method can be evoked by calling:
TAG : reactjs
Date : November 01 2020, 12:01 AM , By : StrTzirtzi
HOC vs Wrapper in render function
HOC vs Wrapper in render function
I think the issue was by ths following , In your case, there is no real differences, but when you want to do operations on the component state, HOC allows you to code function that can work on this.state. This state will be the one of the component w
TAG : reactjs
Date : October 31 2020, 05:38 PM , By : tom
Need to find the way to slice this array to show only n customers
Need to find the way to slice this array to show only n customers
this will help It is better to get a sub-array and render it than render the whole array and get a sub-array.There is a standard Javascript slice(from, count?) method to get a part of array, first parameter tells the index to start with, second optio
TAG : reactjs
Date : October 31 2020, 05:55 AM , By : hongfei
Do I need to specify the key prop in this case and how would I do that then?
Do I need to specify the key prop in this case and how would I do that then?
will help you The mapping function you use returns an array of elements, and not a react element, so key property is not expected thus no warning are being given.I would advise you to refactor your code for mapping function to return react element li
TAG : reactjs
Date : October 31 2020, 12:01 AM , By : Sreeda
rror: FactoryMethod.render(): A valid React element (or null) must be returned.
rror: FactoryMethod.render(): A valid React element (or null) must be returned.
To fix this issue I have the following error: , lol error is self explanatory, didnt pay attention enough
TAG : reactjs
Date : October 26 2020, 11:56 AM , By : Victoriano Román
How to pass a function instead of string as a prop to a component
How to pass a function instead of string as a prop to a component
it fixes the issue You can most definetly use a function to return a string. The problem with your implementation is that you were passing a whole function by reference rather than the result of a function.Just do this simple fix below. This will exe
TAG : reactjs
Date : October 26 2020, 11:56 AM , By : Bezzo
what is wrong with 'this.setState'
what is wrong with 'this.setState'
Hope that helps The function () { ... } syntax won't maintain the this reference from the context. Use an arrow function instead:
TAG : reactjs
Date : October 26 2020, 11:56 AM , By : 王思杰
Use ref to invoke instance methods
Use ref to invoke instance methods
I hope this helps you . You need to store the ref ("reference") to the drawer. I think it should be
TAG : reactjs
Date : October 25 2020, 04:08 PM , By : Sam G
How to keep two separate categories under the same list, but keep other categories separated per se?
How to keep two separate categories under the same list, but keep other categories separated per se?
it helps some times as the question says, how do I filter out and keep two categories in the same list, but the "third" category is in a separate section in React/redux? , Group categories by schema:
TAG : reactjs
Date : October 25 2020, 02:08 AM , By : Christian Arroyo
Stateless function components cannot hav refs
Stateless function components cannot hav refs
hope this fix your issue What seems to me is that you are not using the refs the right way. The way you are using them has been deprecated. You should follow this syntax:
TAG : reactjs
Date : October 25 2020, 02:08 AM , By : Subru snath
Update array object in React Redux reducer
Update array object in React Redux reducer
I think the issue was by ths following , This should be simple but I'm not finding the simple answer I want. I have a reducer: , Assuming your action is something like:
TAG : reactjs
Date : October 24 2020, 03:08 PM , By : Alfonso
PropTypes React Native is not an object
PropTypes React Native is not an object
hope this fix your issue PropTypes moved into separate package. Use prop-types package.More info here.
TAG : reactjs
Date : October 24 2020, 01:08 AM , By : Francesco Giaretta
Jest test fail: SyntaxError: Unexpected token <
Jest test fail: SyntaxError: Unexpected token <
I wish did fix the issue. Jest doesn't use Webpack so it doesn't know how to load other file extensions than js/jsx. To add support for other extensions you need to write custom transformers. One of the transformers is a Typescript transformer which
TAG : reactjs
Date : October 24 2020, 01:08 AM , By : mahsa.m
React Redux form and connect syntax
React Redux form and connect syntax
it fixes the issue Since the connect method decorates the original component, and returns a decorated component, you can pass that component to reduxForm (Redux Form FAQ).You can see an example in the docs.
TAG : reactjs
Date : October 24 2020, 01:08 AM , By : Monica Beaumont
Can anyone provide an example on React-Redux Jest testing?
Can anyone provide an example on React-Redux Jest testing?
I hope this helps . You should test raw component because it's clear that redux works so you don't have to test it. If for some reason you want to test mapStateToProps or mapDispatchToProps export them as well and test them separately in isolation.So
TAG : reactjs
Date : October 23 2020, 03:08 PM , By : Kodzo
React server side renderer omits setState callback function?
React server side renderer omits setState callback function?
wish help you to fix your issue Well, I figured it out, and turns out, as is too often the case, this was a self-inflicted error. The default Gatsby install uses React v15 but we wanted to use 16, so we added a direct dependency to it in package.json
TAG : reactjs
Date : October 22 2020, 01:08 AM , By : Marcelo Santos
Bootstrap Checkbox Not Toggling
Bootstrap Checkbox Not Toggling
Hope this helps You are passing to checked prop of the Checkbox a value from the parent via props. Are you sure you update the new state in the parent and passing a new prop again?Here is an example using your code:
TAG : reactjs
Date : October 22 2020, 01:08 AM , By : samsg30
distorted map image when using react-leaflet
distorted map image when using react-leaflet
With these it helps Adding import 'leaflet/dist/leaflet.css' to my component got it working.
TAG : reactjs
Date : October 21 2020, 03:08 PM , By : NARAYAN
react-scripts Invalid Host header
react-scripts Invalid Host header
I wish did fix the issue. You can manage it without changing stuff inside node_modules or by ejecting your project by using an npm package called react-app-rewired.It basically has an option to override your default hardcoded settings for webpack tha
TAG : reactjs
Date : October 21 2020, 03:08 PM , By : Li Ying
remove text from button that created in loop
remove text from button that created in loop
Any of those help If you want to create components dynamically, with a button created for each letter in an array of letters, you can do something like the following (inside the render method).
TAG : reactjs
Date : October 21 2020, 01:08 AM , By : Gopala K
how to limit redux-form's fieldArray field.push to 3
how to limit redux-form's fieldArray field.push to 3
like below fixes the issue how to limit redux-form's fieldArray field.push Should max out at three. Using redux-from example version 6.8.0 , You can pass the handler conditionally:
TAG : reactjs
Date : October 18 2020, 01:08 AM , By : Rasel Ahmed
Referencing state for loop rendered elements in react
Referencing state for loop rendered elements in react
like below fixes the issue Setting state in componentWillMount is not a good practice like it states in react docs..
TAG : reactjs
Date : October 16 2020, 03:08 PM , By : sall
React Native update multidimensional state value on switch press
React Native update multidimensional state value on switch press
it should still fix some issue What are you using for state management i.e. how is your accessList collection being stored? If it's coming from redux, you could pass an action with the index of the item you want to update like so:
TAG : reactjs
Date : October 15 2020, 03:08 PM , By : Thomas Steiner
Draft.js - How to trim contents
Draft.js - How to trim contents
This might help you Maybe exist a more elegant solution, but when I faced with the same problem I solved it with this code:
TAG : reactjs
Date : October 15 2020, 01:08 AM , By : ohhyun kweon
how to syncState to firebase with re-base?
how to syncState to firebase with re-base?
seems to work fine In case someone gets into a similar issue - this the solution that worked for me:
TAG : reactjs
Date : October 14 2020, 09:39 AM , By : atagat
React component test with enzyme
React component test with enzyme
To fix the issue you can do I have a component like this: , This could be a test using mocha:
TAG : reactjs
Date : October 14 2020, 09:39 AM , By : C0d3r
Under what circumstances React class component will be constructed many times?
Under what circumstances React class component will be constructed many times?
should help you out In order for a component to be rendered, the constructor must be called to create an instance of its backing class. This only needs to be done once, before the first render.If your component is added, then removed, then added agai
TAG : reactjs
Date : October 14 2020, 09:27 AM , By : Kangsen Huey
react-native 0.49 brackets after base class
react-native 0.49 brackets after base class
fixed the issue. Will look into that further I believe it is flow and it defines type of the component properties - in this case no properties are expected for App.See more https://flow.org/en/docs/react/components/
TAG : reactjs
Date : October 14 2020, 09:25 AM , By : Howzer
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