jquery - ALT followed by Q (custome shortcut) is not working with browser in javascript -


i trying implement keyboard shortcut application. want use alt + q combination. however, when try run code , press alt key, sets focus on browsers menu bar control , fails.

i tried stop event propagation several methods like,

function keydowneventhandler() {     if (event.keycode == 18) {        //stop code      } }  stoppropagation(event); canclebubbling(); return false; event.preventdefault();

still behaves way.
edit - actually problem not detection. when user press alt key , release , q key pressed after that, highlights browser menu. doesn't call function custom shortcut.

is default behaviour of browser ? can override ?

please in same.
thanks

update

here fiddle detecting "alt+q" sequence:

document.onkeydown = keycheck; var previouskeycode = 0; function keycheck(e) {     var keyid = (window.event) ? event.keycode : e.keycode;     switch (keyid)     {         case 18:             previouskeycode = 18;             break;         case 81:             if (previouskeycode == 18) {                 alert("alt+q pressed!!!")             }             previouskeycode=keyid;             break;        default: previouskeycode=keyid;     } }

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