The event object (instance) of jquery.

whichproperty is used to return the keyboard key or mouse button that is pressed when the current event is triggered .

For keyboard and mouse events, this property is used to determine which keyboard key or mouse button you are pressing.

whichThe properties of the DOM are event.keyCode event.charCode normalized and are native.

The applicable event types are mainly keyboard events: KeyPress, KeyDown, KeyUp, and mouse events: MouseUp, MouseDown.

This property belongs to the Event object (instance) of jquery.

JQuery 1.1.3 adds this property.

EventObject.  which

return value

whichThe return value of the property is the number type, which returns the keyboard key or mouse button that was pressed when the current event was triggered.

In the MouseDown,MouseUp event, the event.which property returns the mapping code value (equivalent) of the corresponding mouse button event.button . The following is a table of the main mouse button mapping codes.

Event.which Property Value	the corresponding mouse button
1	Left mouse button
2	middle mouse button (wheel key)
3	right mouse button

In the KeyPress event, the event.which property returns the Unicode value (equivalent) of the character entered event.charCode . The following are common character Unicode code correspondence tables. For Unicode code for more characters, see full ASCII encoding table (Unicode compatible ASCII).

which property value (or range)	the corresponding input character
48-57	corresponding characters 0-9
65-90	Corresponding characters A-Z
97-122	Corresponding characters A-Z

In the KeyDown,KeyUp event, the event.which property returns the mapping code value (equivalent) of the corresponding key event.keyCode . The following is a table of common keyboard key mapping codes:

which property value (or range)	the corresponding keyboard keys
8	Backspace key
9	TAB key
13	Enter key
16	Shift key
17	CTRL key
20	ALT key
20	Caps Lock key (case lock)
27	ESC key
33-36	corresponding keys PageUp, PageDown, End, Home
37-40	Corresponding keys left, top, right, bottom (direction key)
45-46	corresponding keys Insert, Delete
48-57	corresponding keys 0-9 (non-keypad)
65-90	Corresponding keys A-Z
91	Windows key
96-105	Corresponding key 0-9 (keypad)
106, 107, 109, 110, 111	corresponding keys *, + 、-、.、/(keypad)
112-123	Corresponding Key f1-f12

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The event.which jquery sample code associated with the attribute is as follows (where the code for the form Validation section is only for simple, non-null validation):

//binding KeyDown and MouseDown two events for the current document//detects that the mouse has pressed those keys//detect the keyboard press the letter keys$ (document). Bind ("KeyDown MouseDown",function(event) {varmsg = "; if(Event.type = = "MouseDown") {//Mouse Down Events        varMap = {"1": "Left", "2": "Medium", "3": "Right"}; Msg= ' You pressed the mouse [' + Map[event.which] + '] key '; }Else{//Keyboard Press Event        if(Event.which >= && Event.which <= 90) {msg= ' You pressed the keyboard [' + String.fromCharCode (Event.which) + '] key '; }    }    if(msg) {$ ("#msg"). Prepend (msg + ' <br> ')); }});

$ (function () {            $ ("body"). KeyDown (function (event) {                if (Event.which = =) {                    $ ("#frm"). Submit ();                }            })        })

The event object (instance) of jquery.