2024年12月19日 · Learn about the keydown event, including its type, syntax, and properties, code examples, specifications, and browser compatibility.

The onkeydown event occurs when the user presses a key on the keyboard. The onkeypress event is deprecated. It is not fired for all keys (like ALT, CTRL, SHIFT, ESC) in all browsers. To detect if the user presses a key, always use the onkeydown event. It works for all keys. onkeydown is a DOM Level 2 (2001) feature.

The keydown event is sent to an element when the user presses a key on the keyboard. If the key is kept pressed, the event is sent every time the operating system repeats the key. It can be attached to any element, but the event is only sent to the element that has the focus.

2022年1月21日 · The KeyDown event occurs when the user presses a key on a running form while that form or a control on it has the focus. The KeyDown and KeyPress events alternate repeatedly until the user releases the key, at which time the KeyUp event occurs.

The keydown () method triggers the keydown event, or attaches a function to run when a keydown event occurs. Tip: Use the event.which property to return which keyboard key was pressed. Trigger the keydown event for the selected elements: Attach a …

2024年11月1日 · The event type (keydown, keypress, or keyup) identifies what kind of keyboard activity occurred. Note: KeyboardEvent events just indicate what interaction the user had with a key on the keyboard at a low level, providing no contextual meaning to that interaction.

2023年12月27日 · keydown Event: This event occurs when the user has pressed down the key. It will occur even if the key pressed does not produce a character value. keypress Event: This event occurs when the user presses a key that produces a character value. These include keys such as the alphabetic, numeric, and punctuation keys.

2024年11月1日 · A keydown event is first fired. If the key is held down further and the key produces a character key, then the event continues to be emitted in a platform implementation dependent interval and the KeyboardEvent.repeat read only property is set to true.

There are three main keyboard events: keydown – fires when you press a key on the keyboard and fires repeatedly while you’re holding down the key. keyup – fires when you release a key on the keyboard. keypress – fires when you press a character keyboard like a, b, or c, not the left arrow key, home, or end keyboard, …

keydown – on pressing the key (auto-repeats if the key is pressed for long), keyup – on releasing the key. Main keyboard event properties: code – the “key code” ("KeyA", "ArrowLeft" and so on), specific to the physical location of the key on keyboard.