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How to Display Length of the Input Text in ReactJS

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by Abdul Rawoof A R dot icon Updated: Jan 31, 2023

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In a React application, "displaying the length of input text" refers to displaying the number of characters that have been typed into an input field. 


The length of input text can be shown in a React application in a number of ways: 

  • Input validation: The user can be told if their input meets the specified length for a particular field by viewing the length of the input. 
  • Character limit: By showing the length of the input, the user can see if they have entered more characters than are permitted in a given field. 
  • Progress indicator: The user can be informed of their progress in finishing a form or other input-based task by showing the length of the input. 
  • Instant feedback: By showing the input length in real-time, users can receive immediate feedback on their input and learn from any mistakes they may have made. 
  • Showing how many options are selected in a drop-down menu with several selections. 


Here is how you can display the length of the input text in React: 

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.

How can I update a paragraph tag in REACT when an input field is changed?

Lines of Code : 32dotLicense : Strong Copyleft (CC BY-SA 4.0)

Dependent Libraries : 
class App extends Component {
  constructor() {
    this.state = {
      textLength: 0,
      text: '',
    }
  }
  textLengthHandler = (event) => {
    let length = 0;
    const text = event.target.value;
    if (event) {
      length = text.length
    };
    console.log("length is " + length);
    this.setState({
      textLength: length,
      text: text,
    });
  }

  render() {
    return (
      <div className="App">
        <input type='text' onChange={this.textLengthHandler} value={this.state.text}/>
        <p>length is {this.state.textLength}</p>
      </div>
    );
  }
}

export default App;

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. Import React and Component in app.js file.
  7. Add super() keyword(in the 4th line) inside constructor(refer preview of the output as well).
  8. Open the terminal from IDE.
  9. 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 can i update paragraph tag in react when input field is changed' 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 display length of the input text 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 display length of the input text 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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