UIEvent.isChar - Web APIs 编辑

Obsolete

This feature is obsolete. Although it may still work in some browsers, its use is discouraged since it could be removed at any time. Try to avoid using it.

The UIEvent.isChar read-only property returns a Boolean indicating whether the event produced a key character or not.

Syntax

var isChar = UIEvent.isChar;

Value

A Boolean which is true if the event produces a character; otherwise false. Some keystroke combinations may raise events but not produce any character (example: ctrl-alt-?). When this is the case, isChar returns false. It is used when event handlers need to do something like echo the input on the screen.

Example

In this snippet, which is part of an event handler, the event is checked to see if it generates a character; if it does, the value of UIEvent.which is appended to a string which buffers the typed characters.

if (event.isChar) {
  characterBuffer += e.which;
}

Specifications

This property is not part of any specification.

Browser compatibility

BCD tables only load in the browser

See also

• UIEvent