JIYIK CN >

Current Location:Home > Learning > WEB FRONT-END > React >

Clearing the value of an input field in React.js

Author:JIYIK Last Updated:2025/03/16 Views:

To clear the value of an input field in React:

  1. Store the input value in a state variable.
  2. When a certain event occurs, set the state variable to an empty string.
  3. For uncontrolled components, set the value of ref to an empty string, ref.current.value = '';e.g.

Clear the value of an input field in Reactjs

import {useState} from 'react';

const App = () => {
  // 👇️ 将输入的值存储在状态中
  const [message, setMessage] = useState('');

  const handleChange = event => {
    setMessage(event.target.value);
  };

  const handleClick = () => {
    // 👇️ 清除 input 值
    setMessage('');
  };

  return (
    <div>
      <input
        id="message"
        name="message"
        type="text"
        onChange={handleChange}
        value={message}
      />

      <button onClick={handleClick}>Clear field</button>
    </div>
  );
};

export default App;

We use useStatethe hook to store the value of the input field in a state variable.

To clear the entered value, we have to set the message status variable to an empty string.

Every time the button is clicked, the function we passed to onClickthe attribute of the button element will be called handleClick.

The button can be a submit button for a form, or a simple button that triggers an event.

This method can be used to reset the values ​​of as many input fields as needed.

useRefIf we use an uncontrolled component via the hook, set the value of ref to an empty string.

import {useRef} from 'react';

const App = () => {
  const ref = useRef(null);

  const handleClick = () => {
    // 👇️ 清除 input 字段值
    ref.current.value = '';
  };

  return (
    <div>
      <input ref={ref} id="message" name="message" type="text" />

      <button onClick={handleClick}>Clear field</button>
    </div>
  );
};

This code example achieves the same result, but for an uncontrolled component.

useRef()The hook can be passed an initial value as an argument. The hook returns a mutable ref object whose .currentattributes are initialized to the passed argument.

注意, we have to access the current property of the ref object to access the input element on which we set the ref attribute.

When we pass a ref prop to an element, for example <input ref={myRef} />, React .currentsets the property of the ref object to the corresponding DOM node.

This method can be used to clear the values ​​of as many uncontrolled input fields as needed.

Alternatively, when using uncontrolled input fields, we can also use reset()the method to clear the values ​​of all input fields in the form.

import {useRef} from 'react';

const App = () => {
  const firstRef = useRef(null);
  const lastRef = useRef(null);

  const handleSubmit = event => {
    console.log('handleSubmit ran');
    event.preventDefault();

    // 👇️ 清除表单中的所有输入值
    event.target.reset();
  };

  return (
    <div>
      <form onSubmit={handleSubmit}>
        <input
          ref={firstRef}
          id="first_name"
          name="first_name"
          type="text"
        />
        <input
          ref={lastRef}
          id="last_name"
          name="last_name"
          type="text"
        />

        <button type="submit">Submit form</button>
      </form>
    </div>
  );
};

export default App;

Clear the value of the input field in Reactjs

注意, this approach does not work for controlled components where we store the value of the input field in the state.

We handleSubmitused event.preventDefault()a method in the function to prevent the page from refreshing when the form is submitted.

reset()Method restores the default values ​​of form elements.

No matter how many uncontrolled input fields our form has, reset()a single call to the method will clear all of them.

For reprinting, please send an email to 1244347461@qq.com for approval. After obtaining the author's consent, kindly include the source as a link.

Article URL:

Related Articles

React Tutorial - Transferring Props

Publish Date:2025/03/16 Views:185 Category:React

React transfers Props. Props are generated when components are encapsulated. Components expose some properties (Props) to the outside world to complete some functions.

React Tutorial: Props Anti-Pattern

Publish Date:2025/03/16 Views:183 Category:React

React's Props anti-pattern, using Props to generate state in getInitialState is an anti-pattern - Anti-Pattern.

React Tutorial - Props Validation

Publish Date:2025/03/16 Views:99 Category:React

Props validation is a very useful way to use components correctly. It can avoid many bugs and problems as your application becomes more and more complex. In addition, it can make your program more readable.

Why do you need to bind event handlers in React Class Components?

Publish Date:2025/03/16 Views:58 Category:React

When using React, we must have come across control components and event handlers. We need to use `.bind()` in the constructor of the custom component to bind these methods to the component instance. As shown in the following code:

Solution to the error "does not contain a default export" in React

Publish Date:2025/03/16 Views:187 Category:React

When we try to use `default import` to import from a module that does not have a `default export`, we get a "does not contain a default export" error. To fix the error, make sure the module has named exports and wrap the import in curly braces, e.g.

Solve the Module not found: Can't resolve 'react-bootstrap' error

Publish Date:2025/03/16 Views:85 Category:React

To resolve the error "Module not found: Error: Can't resolve 'react-bootstrap'", make sure to install the react-bootstrap package by opening a terminal in the root directory of the project and running the command `npm install react-bootstrap bootstrap

Scan to Read All Tech Tutorials

Social Media
  • https://www.github.com/onmpw
  • qq:1244347461

Recommended

Tags

Scan the Code
Easier Access Tutorial