I’m trying to make ‘POST’ request in react but i’m getting a few problems regarding CORS. I was just following what console says and fix them in server side [which is PHP] and client side everything works fine when the status is 200 but when status 400 it shows login:1 Failed to load h…
Tag: reactjs
React Formik : how to use custom onChange and onBlur
I’m starting out with the formik library for react, and I can’t figure out the usage of the props handleChange and handleBlur. According to the docs, handleBlur can be set as a prop on a <Formik/>, and then has to be passed manually down to the <input/>. I’ve tried that, with no …
React Navigation TabNavigator: Reset previous tab on tab change
I have the following route structure: When I visit Tab1 -> Route 1 -> Route 2 -> Tab2 and go back to Tab1, the active route is 2 instead of the initialRoute 1. I’m doing the following: but the problem is that it first shows Route 2 and then navigate to Route 1. How can I reset the previous tab/…
MobX – Why should I use `observer` when I could use `inject` when injecting data into a React component
MobX documentation suggests I should use observer on all my components. However by using inject I get more fine grained control over what data causes a re-rendering of my components. My understanding is I that with observer, a change in all accessed observables in the last render will cause a re-render, even …
How to render “N items selected” rather than the list of N selected items with react-select
I’m looking into using react-select as a selector for a city-picker, where users can pick 1 or multiple cities to filter some data on. Here is a screenshot of it rendered in my page: The city list can be large, and I don’t want the selector to grow outside of its blue container if a large number a…
Conditionally concatenate in reducer using lodash
I try to conditionally concat in my reducer, I have an array objects and I want to concatenate only if value not exist in my reducer. If value exists nothing must happen. I use lodash and I tried with _.uniqBy like this : This does not work. Example of my reducer jsFiddle linkk Required output : Because val1 …
React fragment shorthand failing to compile
The project in question is using React-16.2.0 which has the capability to use Fragments and the Fragment shorthand. https://reactjs.org/blog/2017/11/28/react-v16.2.0-fragment-support.html While the full-length syntax works fine… The shorthand fails to compile and I am at a loss as to why this is. Fore e…
“Warning: react-modal: App element is not defined. Please use `Modal.setAppElement(el)` or set `appElement={el}`”
How do I fix this warning in console of a React app using the react-modal package: Warning: react-modal: App element is not defined. Please use Modal.setAppElement(el) or set appElement={el} I have not been successful at figuring out what el is supposed to be. Context: in my App.js root component file: Where …
How to import ipcRenderer in react?
I’ve tried to import ipcRenderer in react app but I get this error message : require is not defined Answer You need to use Otherwise it will try to import it from Webpack or whatever module bundler you use. You can checkout this thread for a better explanation: https://github.com/electron/electron/issue…
Dynamic Opacity not changing when component rerenders in react native
I’m starting to learn React Native, and for my project I created a simple Button component to reuse in my project. I set the opacity value dynamically according to the variable ‘disabled’, however, the look of the button is not changing with the value of the opacity variable. I searched arou…