I have problem with dragging functionality while having large number of rendered lines in React-konva. Currently I am mapping over Array.apply(null, Array(10000)) to render lines horizontally. However, it is very laggy comparing to dragging over an array of only 500 lines for example. I have prepared codesand…
Tag: reactjs
find sum of amount for group of list
I am new to Reactjs. I have below data Output should display like below Please help me. Answer Use Array.reduce()
What is the difference between src, public, and build in folder structure?
I know what these files contain like build contains the minified file which is minified from src file. I need to know how browser works with it. I haven’t uploaded my build file to hosting service yet my website got rendered. In the website, <script> SRC was linked to build but there was no build …
Validate Field in Yup based on multiple related field values with Yup.ref and .test
I’ve created a multi-step form in “react”: “^17.0.1”, “yup”: “^0.29.3”, and “formik”: “^2.2.3”. I want to check that when a user enters in a their Birth Day (dobD) that it is valid based on Birth Month (dobM) and Birth Year (dobY). …
How to automatically generate Input fields related to list of items React.JS
I’m having a problem in dynamically generating input fields in react. So I have a keys state and I need to have an input field for each key and also I have tried this link: How to implement a dynamic form with controlled components in ReactJS? but the problem is that the my values state is empty so it w…
Need to loop till the array inside the array has value
I need to loop(map) the array till inside array have value. If inside array is empty need to stop the loop var parent = { children: [ { id: ‘1’, title: ‘test1’, children: [ …
Firebase Functions and API Keys
Are Firebase functions a safe place to store API keys for a React App? As an example, see the following template for an axios API call in a Firebase Cloud function: cloud function template edit: added text code snippet. The question whether or not it is secure to store the API key directly in this snippet, gi…
How to fix Too many re-renders. React limits the number of renders to prevent an infinite loop
I am new to react and recently i got into this problem and i dont know how to solve it. it says Too many re-renders. React limits the number of renders to prevent an infinite loop. Hows it infinte loop? is it beacuase of on(“value”)? Plz help me to fix it, thank you. Answer You should do your Fire…
How to declare array from API in place of hardcoded array?
I was given an example for some code that has an array hardcoded. Im looking to swap this out for my array that is pulled in from an API using graphql. Below is the code pen to the original example & another for what i’ve tried with no avail. I’m pretty new to graphql & js so likely an ama…
material-ui : enable the dark mode automatically
As per the documentation: It says dark mode theme will be generated automatically and get reflected in UI, but it is not working for me. Code: Signup.js Background is not getting dark with the type. Can someone help with this? Answer My bad. The latest version of Material UI now uses mode attribute of palette…