Do these 3 things before closing this tab:
1Clear out junk files and repair common Windows errors2Fix the driver behind crashes, sound loss and screen glitches3Repair Windows errors before they cause bigger problemsFor a controlled React input, assigning input.value = 'x' changes the DOM element, not the React state that supplies its value prop. Set that backing state instead; if you only need an initial value and do not need React to control later edits, use defaultValue.
Why doesn’t input.value = 'x' fill a React form?
A controlled input gets its displayed value from a prop, usually a state variable. React’s input documentation describes this as making the input match the value supplied by the component. Directly assigning to the DOM node changes its current property, but it does not update the state variable. When React renders again, it can put the state-backed value back into the field.
As an Amazon Associate I earn from qualifying purchases.
React requires a controlled input to have an onChange handler that synchronously updates its backing value. As React’s documentation explains, if the state passed as value is not updated synchronously during onChange, React can revert the field to the specified value after a keystroke.
How do I programmatically set a React input value?
For a change initiated by your application—such as clicking a Fill button—call the setter for the state that supplies value:
#1 Best Overall
- KEYBOARD: The keyboard works for Windows with hot keys that enable easy access to Media, My Computer, Mute, Volume up/down, and Calculator
- EASY SETUP: Experience simple installation with the USB wired connection
- VERSATILE COMPATIBILITY: This keyboard is designed to work with multiple Windows versions, including Vista, 7, 8, 10 offering broad compatibility across devices.
- SLEEK DESIGN: The elegant black color of the wired keyboard complements your tech and decor, adding a stylish and cohesive look to any setup without sacrificing function.
- FULL-SIZED CONVENIENCE: The standard QWERTY layout of this keyboard set offers a familiar typing experience, ideal for both professional tasks and personal use.
function NameField() {
const [name, setName] = useState('');
return (
<>
<input
value={name}
onChange={event => setName(event.target.value)}
/>
<button type="button" onClick={() => setName('x')}>
Fill
</button>
</>
);
}The input and the rest of the component now use the same state value. This is the appropriate route when other application behavior also needs to know the field’s current value.
When should I use defaultValue instead?
Use defaultValue when the field needs an initial value but React does not need to control its current value after that:
Rank #2
- All-day Comfort: The design of this standard keyboard creates a comfortable typing experience thanks to the deep-profile keys and full-size standard layout with F-keys and number pad
- Easy to Set-up and Use: Set-up couldn't be easier, you simply plug in this corded keyboard via USB on your desktop or laptop and start using right away without any software installation
- Compatibility: This full-size keyboard is compatible with Windows 7, 8, 10 or later, plus it's a reliable and durable partner for your desk at home, or at work
- Spill-proof: This durable keyboard features a spill-resistant design (1), anti-fade keys and sturdy tilt legs with adjustable height, meaning this keyboard is built to last
- Plastic parts in K120 include 51% certified post-consumer recycled plastic*
<input defaultValue="x" />This initializes an uncontrolled input; it does not synchronize future edits with a React state variable. Keep the input uncontrolled for its lifetime rather than switching it to a controlled value prop later.
Free tools Windows power users keep installed
One-click scans. No signup required.
What can make a controlled input behave unexpectedly?
- Missing or non-string text value: Keep a controlled text input’s value a string throughout its lifetime. If data may be absent, initialize it to
''or use a fallback such asvalue={someValue ?? ''}. - Delayed or transformed updates: In
onChange, synchronously store the value read from the event, such assetName(event.target.value). Delaying the update or transforming the text in the handler can disrupt the displayed value or caret behavior. - Checkbox or radio field: The checked state is controlled with
checked, notvalue. Readevent.target.checkedin the change handler.
What if a script or browser automation needs to fill the field?
Changing a DOM property and dispatching a synthetic event is not equivalent to updating React component state. React’s issue tracker documents historical cases involving input-value tracking and event ordering, including a report that programmatic changes did not fire onChange: issue #12643 and issue #19389. These reports do not establish one diagnosis for every React version or application, and React’s input reference does not prescribe a universal native-setter recipe. For application-owned behavior, update the state that controls the input; for automation, use the automation framework’s supported user-interaction mechanism rather than relying on direct property assignment as a React API.
Quick Recap
Best Value
- The Lenovo 300 USB keyboard offers an intuitive and comfortable island key design with 2 5 zone layout including separate number pad
- This full-size keyboard includes concaved key caps fitted for your fingertips
- Spill resistant keys with a board drain help keep your PC keyboard protected and keep you productive
- The complete ergonomic design includes an adjustable tilt to improve your typing comfort
- OS independent – This convenient computer keyboard works with laptops desktops and any computer with a USB port
Rank #4
- Durable and Reliable: This USB keyboard features a curved space bar, spill-resistant design (2), durable keys that can withstand 10 million keystrokes, and sturdy, adjustable tilt legs
- Comfortable, Familiar Typing: You’ll enjoy a comfortable and familiar typing experience thanks to the deep-profile keys and standard layout with full-size F-keys and number pad
- Full-size Sculpted Mouse: The high-definition optical USB mouse puts comfort and control in your hands with smooth, accurate tracking and an ambidextrous shape that feels good hour after hour
- Simple Set-Up: Simply plug the keyboard and mouse into the USB ports on your desktop, laptop, or netbook and you're ready to work; compatible with Windows 7, 8, 10 or later
- Clear and Convenient: The bold, bright white and long-lasting characters make the keys on this PC or laptop keyboard easy to read and extra durable
Rank #3
- A plug-and-play USB connection with Low-profile keys give you a quiet, comfortable typing experience
- Simple Wired USB Connection,You will enjoy a comfortable and quiet typing experience
- The keyboard for business and office working is the budget-friendly keyboard that is built for longer use
- Low profile keys for a more comfortable and quiet keystroke, desktop-centric design, splash resistant
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
