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How To Change Background Color Dynamically On Click in React

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

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OnClick in react is an Event Handler function that is used when an event is likely to occur, or we can say to act by calling a respective function.


OnClick can be used for many purposes, including changing the style of the page or creating a pop-up window. If you add onClick to a particular element in your code by clicking on that element in the webpage, the function associated with on-click will be called and act. We can add the onClick function in the tag itself or in a separate JavaScript file. For adding the background color in react, we can use onClick. For this purpose, we will first create a button saying “Add Background.” We can add the onClick handler in the button tag and call the function to add the background color. This way, by clicking on the “Add Background” button, a background color will be added to our page. 


Here is an example of how to change the background color dynamically On Click in React;

Fig 1: Preview of the output that you will get on running this code from your IDE.

Code

In this solution we're using React library.

add background color onClick in react

JavaScriptdotLines of Code : 73dotLicense : Strong Copyleft (CC BY-SA 4.0)

Dependent Libraries : 
const MyList = () => {
  const setSelectedItem = e => {
    Array.from(document.getElementsByClassName("item"))
      .forEach(item => item.classList.remove("selected"));
    e.target.classList.add("selected");
  };

  return (
    <div>
      <ul>
        <li className="item" onClick={setSelectedItem}>
          item 1
        </li>
        <li className="item" onClick={setSelectedItem}>
          item 2
        </li>
        <li className="item" onClick={setSelectedItem}>
          item 3
        </li>
        <li className="item" onClick={setSelectedItem}>
          item 4
        </li>
      </ul>
    </div>
  );
};

import React, { Component } from "react";
import { render } from "react-dom";
import Hello from "./Hello";
import "./style.css";

const App = () => {
  const data = [
    { name: "item 1", isSelected: false },
    { name: "item 2", isSelected: false },
    { name: "item 3", isSelected: false },
    { name: "item 4", isSelected: false }
  ];

  const [items, setItems] = React.useState(data);

  const setSelectedItem = selectedItem => {
    const newItems = [...items];
    newItems.forEach(item => {
      item.isSelected = item.name === selectedItem.name;
    });
    setItems(newItems);
  };

  const buildList = () => {
    return items.map(item => (
      <li className={item.isSelected ? 'selected':''} onClick={() => setSelectedItem(item)}>
        {item.name}
      </li>
    ));
  };
  return <ul>{buildList()}</ul>;
};

render(<App />, document.getElementById("root"));


li{
  padding: 10px;
}

.selected{
  background-color: lightskyblue;
  border-radius: 50px 0 0 50px;
  box-shadow: 2px 2px 5px lightgray;
}

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 as per in the demo given below.
  6. Import React, Component and render(refer preview of the output).
  7. Add export default statement at end of the code(like 'export default App;').
  8. Open the terminal from IDE.
  9. npm start to run the file.


You can also refer this url 'DEMO' for getting the above output.

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 change background onclick in React' 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 change background color onClick 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 change background color onClick 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 on kandi like 'react'.

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