javascript - Handle a keyboard that produces only keypress instead of keydown/keyup events -

i have weird situation specialty pc keyboard produces strange codes in javascript when pressing number keys.

using site (http://unixpapa.com/js/testkey.html), found keyboard produces when pressing number 4:

keydown  keycode=18        which=18        charcode=0         keydown  keycode=101 (e)   which=101 (e)   charcode=0         keyup    keycode=101 (e)   which=101 (e)   charcode=0         keydown  keycode=98  (b)   which=98  (b)   charcode=0         keyup    keycode=98  (b)   which=98  (b)   charcode=0         keyup    keycode=18        which=18        charcode=0         keypress keycode=52  (4)   which=52  (4)   charcode=52  (4)   

a regular keyboard produces this:

keydown  keycode=52  (4)   which=52  (4)   charcode=0         keypress keycode=52  (4)   which=52  (4)   charcode=52  (4)   keyup    keycode=52  (4)   which=52  (4)   charcode=0         

so basically, strange device holds alt key, adds 2 other characters, lets go of alt key, , fires keypress event actual key while ignoring keydown , keyup completely.

i can filter out first part event.altkey no problem, it's rest causing issues.

the problem code written 1 thing on keydown , on keyup, , adding keypress 1 keyboard messing everything...

i doubt there's solution this, , won't support ... weird piece of hardware, in case:

any ideas on how detect if keyboard creates keypress (after filtering out other event.altkey events before that)?

i tried having global variable contains current event code , reset both on keypress , keyup , otherwise receives current keycode, can't work...

here's code:

<input type="text" name="entry" id="entry" onkeyup="entry('up', this, event);" onkeydown="entry('down', this, event);" /> 

yes, keyboard events supposed passed through text field, no return needed here. , javascript:

function entry(dir, field, evt) {     // filter out num lock, alt , alt pressed     if (evt.keycode == 144 || evt.keycode == 18 || evt.altkey)         return false;      if (dir == 'up')  // keyup     {         if (field.value.length > 0)          {              if (evt.keycode == 13) // enter pressed             {                 enteruser();  // if more entries found finduser(), select first one, otherwise empty screen             }             else              {                 finduser();  // start ajax checks field content vs database             }         }     }     else  // keydown     {         if (!field.disabled)         {             emptyscreen();  // if text field disabled because dialog box in front, empty screen.         }     } } 

the trick, of course, support weird keyboard while not breaking stuff other keyboards , barcode scanners working.

chance we'll have tell customer "sorry, proper keyboard" or something, it's bugging me :-)

any thoughts on this?

thanks!

ps: have jquery on site, if there's ideas use that, i'd game, too.