jQuery: 22 - Detecting a keyboard event
It can be useful to detect when a key on the keyboard is pressed by someone visiting your site.
The following events are associated with the keyboard, and you can attach events to any of them:
✓ keydown: A key is pressed.
✓ keyup: A pressed key is released.
✓ keypress: A key is pressed and released.
The keydown event takes place before the keyup event If someone holds down a key and doesn’t release it, the keydown event takes place.
If someone presses a key and releases it, a keypress takes place. Every key on the keyboard is associated with a numeric value. For example, A equals 65, B equals 66, and Z equals 90.
These numbers are called ASCII values. You can see a chart of these values at www.ascii.cl. Now that we know these values, we can detect when a particular letter key is pressed.
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