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How to Build Vote Up and Down React Component

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by Abdul Rawoof A R dot icon Updated: Jan 24, 2023

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Two event handlers control the vote up and down buttons in this component, which also uses the state to keep track of the current vote total. When a user presses a button, the associated event handler is invoked and uses the setState() function to change the vote count in the component's state. The current vote total is then shown via the component's render function. 


  • addEventListener(): This method allows you to specify the type of event that needs to occur. 
  • setState(): This method takes an object containing the new state values you want to update and merges them with the current state. 
  • render(): This method is called every time the component's state or props are modified, allowing the component to update the UI to reflect these changes. 

You may modify the component by passing props for the initial vote tally, the wording for the vote up and down buttons, and other needed features. 


Here is an example of how to build a vote up and down React component;

Fig : Preview of the output that you will get on running this code from your IDE.

Code

In this solution we're using React library.

React Component vote up and down

JavaScriptdotLines of Code : 37dotLicense : Strong Copyleft (CC BY-SA 4.0)

Dependent Libraries : 
import React from 'react';

export class VoteUpDown extends React.Component {
  constructor() {
    super();

    this.state = {
      score: 0,
    };

    this.increment = this.increment.bind(this);
    this.decrement = this.decrement.bind(this);
  }

  render() {
    return (
      <div>
        <div>{this.state.score}</div>
        <button className="countUp" onClick={this.increment}>UP</button>
        <button className="countDown" onClick={this.decrement}>DOWN</button>
      </div>
    );
  }

  increment() {
    this.setState({
      score: this.state.score + 1,
    });
  }

  decrement() {
    this.setState({
      score: this.state.score - 1,
    });
  }
}

Instructions

Follow the steps carefully to get the output easily.

  1. Install the Node.js and React on your IDE(preferable Visual Studio Code).
  2. Create React Application using npx create-react-app foldername.
  3. cd foldername.
  4. Open the folder in IDE.
  5. Copy the code using "copy" button above and paste it in app.js file(remove the earlier code from app.js).
  6. Open the terminal from IDE.
  7. npm start to run the file.


I hope you found this useful. I have added the link to dependent libraries, version information in the following sections.


I found this code snippet by searching for 'how to implement react component up and down' in kandi. You can try any such use case!

Environment Tested

I tested this solution in the following versions. Be mindful of changes when working with other versions.

  1. The solution is created in Visual Studio Code 1.73.1.
  2. The solution is tested on node v18.12.1 and npm v8.19.2.
  3. React version-18.2.0.


Using this solution, we are able to implement click anywhere to close dropdown in React with simple steps. This process also facilities an easy way to use, hassle-free method to create a hands-on working version of code which would help us to implement click anywhere to close dropdown in React.

Dependent Library

reactby facebook

JavaScript doticonstar image 209050 doticonVersion:v18.2.0doticon
License: Permissive (MIT)

The library for web and native user interfaces

Support
    Quality
      Security
        License
          Reuse

            reactby facebook

            JavaScript doticon star image 209050 doticonVersion:v18.2.0doticon License: Permissive (MIT)

            The library for web and native user interfaces
            Support
              Quality
                Security
                  License
                    Reuse

                      You can also search for any dependent libraries on kandi like 'react'.

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