I am currently rendering three buttons using a .map method in React. The buttons are being pulled from an array in a useState. When clicked, the buttons have a .active class added to them. How can I set the first element to have the .active class when the page is first loaded? Current Code: https://codesandbox.io/s/recursing-lake-oetxj?file=/src/App.js Tried setting the first activeObject
Tag: use-state
Removing Elements through button click within a map function?
I’m building a todo application in which all elements are inserted in a list of objects and then mapped using the map() function. I’m attempting to add a button with every map, that once clicked – will delete the specific element from the list. I’ve read quite a bit of documentation relating to the connection of useState and map(), but
React-Redux: Data not read during initial render in useState
I am trying to get a list of data called packages and put it in a table. Added filter and sorting to it. I get packages from pakageList reducer Assign to data state Then add soring and filtering logic and assign data to variable called filteredPackages Everything seems fine but when the page initially loads the contents of the table
How to make a select input that is dependent on other inputs to always show a default value in React?
I have two radio buttons: radio1 and radio2, and one select input. The Select values depend on the radio buttons. I want to set the select value to 1 whenever I select radio1. I’ve tried setting defaultValue and value to the select input but every time I switch back to radio1 from radio2, the value is always set to 2.
Changing object in an array does not trigger change in html React
The object I want to edit gets edited in JSON format, but only previous data gets displayed in the browser. I use these hooks to get a list of products from local storage Then I map all of the objects incrementAmount() function looks like that: From what I see in the console, the array looks fine and the object I
How to properly execute logic right after setState updates the react functional component state?
Currently, I am making a profile page where it will initially fetch the user profile details from an API endpoint. I want to have a loading indicator representing the fetch status. I am now using useState hook where I store a boolean value for isLoading state. However, after reading the documentation about useState it stated that it may be asynchronous.
How do I handle undefined state in react when the user hits cancel on file selection?
I have a simple Input type= file. I am capturing the the selected file in state. Once a file is selected and the clear button is clicked it does not clear the state. This causes {selectedFile.name} to throw an undefined error when the user clicks cancel during the next file selection. Is there a way to make my clear button
Data fetched and set with setState inside useeffect doesnt appear in console log unless i set a timeout
So I am fetching data from my database for each item in the array groups and then I want to map through this data (twice because it’s an array inside an array) in the jsx part of the component. The problem though is that the state is changed “too late” This is my guess because the console log doesn’t show
How to make a button that show the next array item inside a card in gatsbyJs (React)
I’m doing a standard mapping like this; I use slice(0,1) to get only the first array item; without the slice will show all 10 categories in it own card How can create a button or a div that when users click on it; will pass the next card type (or category) from 1/10 to 2/10? Answer Fixed! No need to
how to save a variable with the current data saved in an interval updating state
I am builidng a typicall stopwatch/clock app in here. The issue: When clicking Pause Button then Split Button (which prints the elapsed time) and then start back, both the stopwatch and the printed time restart. That is because I am saving the Crono time in the handleClickSplit function. Any ideas on the best way to save that current paused time