HTML | DOM KeyboardEvent
It refers to the events which occur when a key is pressed on the keyboard.
Syntax:
<input type=”text” onkeypress/onkeydown/onkeyup=”function()/event”>
Events:The following events occur on pressing a key-
- onkeydown
- onkeypress
- onkeyup
Properties:
- altKey: It returns if alt key was pressed or not.
- charCode: It returns unicode character of the key.
- code: It returns the code of the entered key.
- ctrlKey: It returns if ctrl key was pressed or not.
- getModifierState(): It returns true if the specified key is activated.
- isComposing: It returns whether the event is composing or not.
- key: It returns the key value.
- keyCode: It returns unicode character of the onkeypress or onkey doen event.
- location: It returns the location of the key on the keyboard.
- metaKey: It returns if meta key was pressed or not.
- repeat: It returns if a key is repeatedly holding on.
- shiftKey: It returns if shift key was pressed or not.
- which: It returns the unicode character of event type.
Return Value: It returns events which occur when a given key is pressed from the keyboard.
Example-1: Showing onkeypress event.
<!DOCTYPE html> < html > < body > < h1 > < center >Geeks for Geeks </ center > </ h1 > < p >Type something in the box:</ p > < input type = "text" onkeypress = "key()" > < script > function key() { alert("New Key Inserted"); } </ script > </ body > </ html > |
Output:
Before Pressing a key:
After Pressing a key:
Example-2: Showing onkeydown event.
<!DOCTYPE html> < html > < body > < h1 > < center >Geeks for Geeks </ center > </ h1 > < p >Type something in the box:</ p > < input type = "text" onkeydown = "key()" > < script > function key() { alert("New Key Inserted"); } </ script > </ body > </ html > |
Output:
Before Pressing a key:
After Pressing a key:
Example-3: To check if the pressed key is Alt or not.
<!DOCTYPE html> < html > < body > < h1 > < center >Geeks for Geeks </ center > </ h1 > < p >Type something in the box to check if Alt key is pressed or not:</ p > < input type = "text" onkeydown = "isKeyPressed(event)" > < p id = "gfg" ></ p > < script > function isKeyPressed(event) { var x = document.getElementById("gfg"); if (event.altKey) { x.innerHTML = "ALT Key Pressed"; } else { x.innerHTML = "ALT Key Not Pressed"; } } </ script > </ body > </ html > |
Output:
Before Pressing a key:
After Pressing a key:
Example-4: To find out the pressed key from the keyboard.
<!DOCTYPE html> < html > < body > < h1 > < center >Geeks for Geeks </ center > </ h1 > < p >Type something in the box to know the entered key:</ p > < input type = "text" size = "40" onkeydown = "myFunction(event)" > < p id = "gfg" ></ p > < script > function myFunction(event) { var x = event.key; document.getElementById( "gfg").innerHTML = "Entered Key is: " + x; } </ script > </ body > </ html > |
Output:
Before Pressing a key:
After Pressing a key:
Browser Support: The listed browsers support DOM Keyboard Event-
- Google Chrome
- Mozilla Firefox
- Edge
- Safari
- Opera