JS KeyCode Event Response

<script language= "JavaScript" >function KeyEvent () {if (event.keycode==13) alert ("You hit Enter");} Document.onkeydown = keyevent;//Register Document.onkeydown Event
</script>

When the user presses the ENTER key, the KeyEvent () function is executed. Can do a carriage return to submit the form, or other events!

KeyCode is the code that returns the key to the KeyDown what KeyUp event occurred, and the Unicode character of the KeyPress event, and if you want to use a key combination, you can take advantage of event.ctrlkey,event.shiftkey,event. Altkey determines whether the CTRL key, the SHIFT key, and the ALT key are pressed.

Common KeyCode
Key	Code	Key	Code
Left	37	Up	38
Right	39	Down	40
1	49	2	50
3	51	A	65
Shift	16	Ctrl	17
Alt	18	Enter	13

Example:

<! DOCTYPE HTML>
< HTML >
< Head >
    < title > keyboard events keycode</title>
</ Head >
< Body >
    left&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;up&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;right&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;down<BR  />
    CTRL + Up&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;ctrl + down<br/> 
    CTRL + 1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;ctrl + 2&nbsp;&nbsp;&nbsp;& Nbsp;&nbsp;&nbsp;ctrl + 3<br/>
    A&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;ctrl + a&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;ctrl + SHIFT + a<br/>
    < Script type="Text/javascript">
        Document.onkeydown = function (event) {
            Event = Event | | window.event;
            Bctrlkey = Event.ctrlkey;
            Bshiftkey = Event.shiftkey;
            Switch (event.keycode) {
                Case 37:
                    Alert ("left");
                    Break
                Case 38:
                    if (Bctrlkey) {
                        Alert ("Ctrl+up");
                        Break
                    }
                    Alert ("Up");
                    Break
                Case 39:
                    Alert ("right");
                    Break
                Case 40:
                    if (Bctrlkey) {
                        Alert ("Ctrl+down");
                        Break
                    }
                    Alert ("Down");
                    Break
                Case 49:
                    Bctrlkey && (Alert ("ctrl+1"));
                    Break
                Case 50:
                    Bctrlkey && (Alert ("ctrl+2"));
                    Break
                Case 51:
                    Bctrlkey && (Alert ("ctrl+3"));
                    Break
                Case 65:
                    if (Bctrlkey) {
                        if (Bshiftkey) {
                            Alert ("Custom");
                            Break
                        }
                        Alert ("Select All");
                        Break
                    }
                    Alert ("a");
                    Break
                Case 67:
                    Bctrlkey && (Alert ("Copy"));
                    Break
                Case 86:
                    Bctrlkey && (Alert ("paste"));
                    Break
            }
            return false;
        }
    </ Script >
</ Body >
</ HTML >

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<script language= "javascript" >
     function KeyEvent () {
     if (event.keycode==13)
     Alert ("#$%#%#^^%");
     }
     document. onkeydown = KeyEvent;
</script>
The Event.keycode value for 37,38,39,40 corresponds to the pressed direction key divided by left, top, right, bottom
"Javascript:if (Event.keycode < 45 | | Event.keycode >) Event.returnvalue = false;");
if (event.keycode==13) on behalf of the press is the carriage return keyboard
"javascript:if (Event.keycode > && event.keycode <) Event.returnvalue = false;");

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< reference: Http://lfsp.btwlo.com/keycode.html & http://www.cnblogs.com/xingqiba/archive/2012/06/12/2546148.html & http://www.cnblogs.com/kuikui/archive/2012/02/09/2343645.html>

JS KeyCode Event Response