I want to use useEffect and for-loop to generate multiple JSX elements but nothing is rendered in this case. warning code: “React Hook useEffect has a missing dependency: ‘renderInfoCard’. Either include it or remove the dependency array react-hooks/exhaustive-deps” Answer I wouldnR…
Tag: use-effect
How to pass correct state value into callback function inside useEffect hook?
I’m trying to change a state of a variable that holds photo ID when a user presses arrow keys or clicks on an image, then I render my image depending on that photo ID. CODE: Setting up a state by clicking/un-clicking on an image works without a problem, the state is set to a correct number. But my funct…
How to better setup fetch with useEffect?
Im learning JS and React and I came to the code example below and some parts I don’t understand properly. The second .then is inside useUffect is this ok, or it’s better to be in getData func? Also in render there is data**?**.map and I don’t understand why we need ?, is this ternary operato…
How to generate data for the child component?
Here is the parent code: Here is the child code: The expected result is that: When the user picks a month from the MonthPicker, the parent component submit the select month and year to server. Get the result from the server and then send the result to the child component. The actual result is that the child c…
React store problem using easy peasy, unexpcted rendering mess up the model in store
When I call an action, first time data is loaded perfectly fine. Component re-renders again and messes up the state. Default State Working State After unexpected render My Code Answer I Updated React.useEffect() to : Now it works.
Sibling component not re-rerendering on state change (using useEffect, useState and Context)
In my Main.js I create a first global state with a username and a list of users I’m following. Then, both the Wall component and FollowingSidebar render the list of follows and their messages (plus the messages of the main user). So far so good. But in a nested component inside FollowingSidebar called F…
dispatching actions on every render
I am dispatching action addProducts on every mount of the ProductList component whereas i want to dispatch the action one timeusing useEffect hook and store the data in the redux and then use it. Below are my actions file and ProductList component file. actions.js file ProductList.js component file Answer You…
setInterval keeps on running after clearInterval called
This is a snippet of the code: I checked the solutions suggested in other posts but none of them is working. Answer You can use state value to track and keep id of interval. Check below for detail.
Converting componentDidMount into useEffect
I am trying to learn React hooks, and trying to convert existing codebase to use hooks, but I am confused. Is it normal to set state inside useEffect? Would I be causing the dreaded infinite loop if I do so? My original class based component: Answer It’s okey to set state inside useEffect as long as you…
Do I need to use useEffect to rerender a component?
I had an issue getting a component to update when it´s props changed. I got it to work using useEffect, but am unsure if it is the correct way to solve my problem. This is my code: I was thinking when I updated the props of InputWithDefaultValue it would get rerendered. Is using useEffect to get the component…