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The read-only badInput property of a ValidityState object indicates if the user has provided input that the browser is unable to convert. For example, if you have a number input element whose content is a string. Note: While this is unsupported in Internet Explorer, any non-numeric value will be dismissed from the field if it is a number input.

Example

<input type="number" id="age">
var input = document.getElementById("age");
if (input.validity.badInput) {
  console.log("Bad input detected…");
} else {
  console.log("Content of input ok.");
}

Specifications

Specification Status Comment
HTML Living Standard
The definition of 'ValidityState.badInput' in that specification.
Living Standard Live Standard
HTML 5.1
The definition of 'ValidityState.badInput' in that specification.
Recommendation No change from the previous snapshot HTML5.
HTML5
The definition of 'ValidityState.badInput' in that specification.
Recommendation First snapshot of  HTML Living Standard containing this interface.

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
badInputChrome Full support 25Edge Full support 14Firefox Full support 29IE No support NoOpera Full support 15Safari Full support 11WebView Android Full support 4.4Chrome Android Full support YesEdge Mobile ? Firefox Android Full support 64Opera Android Full support 46Safari iOS Full support 7Samsung Internet Android Full support 4.0

Legend

Full support  
Full support
No support  
No support
Compatibility unknown  
Compatibility unknown

See also

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