Tag: java

69 votes
18 answers
550 views
How can I update the parent's state in React?

My structure looks as follows: Component 1 - |- Component 2 - - |- Component 4 - - - |- Component 5

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Stacia
0 1 0 9
asked 07 September, 2021
57 votes
30 answers
2.6K views
How to add multiple classes to a ReactJS Component?

I am new to ReactJS and JSX and I am having a little problem with the code below. I am trying to add multipl

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Forrest
0 1 0 9
asked 07 September, 2021
59 votes
14 answers
1.3K views
React JSX: selecting "selected" on selected <select> option

In a React component for a <select> menu, I need to set the selected attribute on the option that reflec

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Gigi
0 1 0 9
asked 07 September, 2021
52 votes
16 answers
610 views
Correct modification of state arrays in React.js

I want to add an element to the end of a state array, is this the correct way to do it? this.state.arrayvar.pu

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Dorian
0 1 0 9
asked 07 September, 2021
63 votes
30 answers
2.3K views
How to update nested state properties in React

I'm trying to organize my state by using nested property like this: this.state = { someProperty: {

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Thurman
0 1 0 9
asked 07 September, 2021
44 votes
16 answers
1.3K views
Parse Error: Adjacent JSX elements must be wrapped in an enclosing tag

I am trying to set up my React.js app so that it only renders if a variable I have set is true. The way my

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Yolando
0 1 0 9
asked 07 September, 2021
54 votes
9 answers
1.1K views
Pros/cons of using redux-saga with ES6 generators vs redux-thunk with ES2017 async/await

There is a lot of talk about the latest kid in redux town right now, redux-saga/redux-saga. It uses generator

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Stacia
0 1 0 9
asked 07 September, 2021
60 votes
7 answers
2K views
ReactJS - Does render get called any time "setState" is called?

Does React re-render all components and sub components every time setState() is called? If so, why? I thought

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Freida
0 1 0 9
asked 07 September, 2021
59 votes
30 answers
674 views
Perform debounce in React.js

How do you perform debounce in React.js? I want to debounce the handleOnChange. I tried with debounce(this.h

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Nereida
0 1 0 9
asked 07 September, 2021
58 votes
30 answers
704 views
Detect click outside React component

I'm looking for a way to detect if a click event happened outside of a component, as described in this ar

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Xavier
0 1 0 9
asked 07 September, 2021
57 votes
18 answers
2.3K views
A component is changing an uncontrolled input of type text to be controlled error in ReactJS

Warning: A component is changing an uncontrolled input of type text to be controlled. Input elements should

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Venice
0 1 0 9
asked 07 September, 2021
58 votes
30 answers
3K views
What is the difference between state and props in React?

I was watching a Pluralsight course on React and the instructor stated that props should not be changed. I&apo

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Fabian
0 1 0 9
asked 07 September, 2021
58 votes
30 answers
599 views
Show or hide element in React

I am messing around with React.js for the first time and cannot find a way to show or hide something on a page

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Forrest
0 1 0 9
asked 07 September, 2021
62 votes
20 answers
2.7K views
Call child method from parent

I have two components: Parent component Child component I was trying to call Child's method from Parent,

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Forrest
0 1 0 9
asked 07 September, 2021
62 votes
13 answers
3K views
How to get first N number of elements from an array

I am working with Javascript(ES6) /FaceBook react and trying to get the first 3 elements of an array that vari

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Trudy
0 1 0 9
asked 07 September, 2021
56 votes
10 answers
2.8K views
Difference between npx and npm?

I have just started learning React, and Facebook helps in simplifying the initial setup by providing the follo

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Freida
0 1 0 9
asked 07 September, 2021
59 votes
28 answers
2.9K views
How to set focus on an input field after rendering?

What's the react way of setting focus on a particular text field after the component is rendered? Docume

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Chaya
0 1 0 9
asked 07 September, 2021
59 votes
17 answers
2.2K views
How do I conditionally add attributes to React components?

Is there a way to only add attributes to a React component if a certain condition is met? I'm supposed to

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Dario
0 1 0 9
asked 07 September, 2021
60 votes
30 answers
2.6K views
React js onClick can&apos;t pass value to method

I want to read the onClick event value properties. But when I click on it, I see something like this on the co

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Daniel
0 1 0 9
asked 07 September, 2021
68 votes
11 answers
821 views
Why do we need middleware for async flow in Redux?

According to the docs, "Without middleware, Redux store only supports synchronous data flow". I don't und

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Mikki
0 1 0 9
asked 07 September, 2021