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When using .keydown I can capture keydown event, then check and prevent default action (display the character).
When using .keyup I cannot?
I know the event is being captured as alert() fires when the code is inside the condition yet the preventDefault() doesn't prevent the action.
Here is a full DEMO
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The keydown event occurs when the key is pressed, followed immediately by the keypress event. Then the keyup event is generated when the key is released.
Both are used as per the need of your program and as per the convenience of the user. keyup Fires when the user releases a key, after the default action of that key has been performed. keydown Fires when the user depresses a key.
The keydown event is fired when a key is pressed. Unlike the keypress event, the keydown event is fired for all keys, regardless of whether they produce a character value. The keydown and keyup events provide a code indicating which key is pressed, while keypress indicates which character was entered.
The keyup event occurs when a keyboard key is released. The keyup() method triggers the keyup event, or attaches a function to run when a keyup event occurs. Tip: Use the event. which property to return which key was pressed.
The keydown events happens when a key is pressed down, and then keyup – when it’s released. The key property of the event object allows to get the character, while the code property of the event object allows to get the “physical key code”. For instance, the same key Z can be pressed with or without Shift.
The preventDefault () method will not work in keyup event, because it is fired after the default event has already occurred. So listening to keyup event is too late for calling preventDefault.
Definition and Usage. The preventDefault() method cancels the event if it is cancelable, meaning that the default action that belongs to the event will not occur. For example, this can be useful when: Note: Not all events are cancelable. Use the cancelable property to find out if an event is cancelable.
Keydown and keyup. The keydown events happens when a key is pressed down, and then keyup – when it’s released. The key property of the event object allows to get the character, while the code property of the event object allows to get the “physical key code”.
In keyup event the character has been typed and can't be undone but in keydown nothing has been typed and the browser has intent to type the character, so you can cancel the browser intent.
Whenever you type a character the following events occur:
keydown --> keypress repeatedly until the key is released --> keyup
keydown -> can be prevented -> fired when press a keykeypress -> can be prevented -> fired when hold a keykeyup -> cannot be prevented -> fired when release a key
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