React Js Set Input Field Default Value

React Js Set Input field default value:To set a default value for an input field in React.js, you can use the defaultValue attribute. This attribute allows you to specify the initial value for the input field. Simply assign the desired default value to the defaultValue attribute within the input element.

For example, <input type="text" defaultValue="Default Value" /> will set the input field's default value to "Default Value". Keep in mind that the defaultValue attribute is used only for the initial rendering and doesn't update the value if the user makes changes. To handle dynamic updates, you should use the value attribute and manage the state of the input field.

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How can you set a default value for an input field in React.js?

The provided code is an example of a React.js component that sets the default value for an input field. In this case, the default value is "John Doe". The component uses the useState hook from React to manage the state of the input field.

The defaultValue attribute of the input element is set to "John Doe", which will be displayed as the default value when the component is rendered. Whenever the input value changes, the onChange event handler is triggered, updating the name state variable with the new value. The updated name value is then displayed in the paragraph element below the input field.

Overall, this code demonstrates how to set a default value for an input field and handle changes to the input value using React.js.

React Js Set Input field default value Example

<script type="text/babel">
        const { useState } = React

        function App() {
            const [name, setName] = useState('');
            return (
                <form className='container'>
                    <h3>React Js Set Input field default Value</h3>
                    <label>
                        Name:
                        <input
                            type="text"
                            defaultValue="John Doe" // Set the default value here
                            onChange={(e) => setName(e.target.value)}
                        />
                        <p>{name}</p>
                    </label>
                    <button type="submit">Submit</button>
                </form>
            );
        }
        ReactDOM.render(<App />, document.getElementById("app"));
    </script>

Run

Output of React Js Set Input field default value

How can you set a default value in a text field using the `useState` hook in React.js?

In this React.js code snippet, a functional component named "App" is created. It utilizes the useState hook to manage a state variable called "inputValue," initialized with the default value "Welcome to Font Awesome Icons." The <input> element's value attribute is set to this state variable, ensuring that the text field displays the default value. The handleChange function updates "inputValue" when the user types in the text field. This approach allows you to both set and dynamically update the default value of the text field in a React application, ensuring a controlled input field.

React Js set Default Value in Text Field Method 2

<script type="text/babel">
    const { useState } = React;
    function App() {
      // Define a state variable to hold the input value
      const [inputValue, setInputValue] = useState('Welcome to Font Awesome Icons');

      // Update the state when the input value changes
      const handleChange = (e) => {
        setInputValue(e.target.value);
      };

      return (
        <div className='container'>
          <h3 className='title'>React Js Set Default Value in Text Field</h3>
          <input
            type="text"
            value={inputValue} // Set the value attribute to the state variable
            onChange={handleChange}
            className='input-field'
          />
        </div>

      );
    }

    ReactDOM.render(<App />, document.getElementById("app"));
  </script>

Run

Output of React Js set Default Value in Text Field

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