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reset modifiers to false on window focus. fixes alt+tab, tab switching, and related issues #32

merged 1 commit into from

2 participants


proposed fix for issue #16, including these example problems:

  • when I alt+tab away from the browser to another application, the window doesn't get the keyup events, so _mods[alt] stays true after I navigate back. to reproduce:

key('d', function () {
console.log('pressed d!');

alt+tab to another program.
navigate back to the browser.
press 'd', nothing happens.

  • same issue when I use shift+command+] to switch browser tabs on mac (or any other tab-switching shortcut that involves modifiers).

  • here's a sweet one :) same issue when i do:

key('ctrl+c', function () {
alert('pressed ctrl+c!');
}) ;

alert() takes focus away from the window, so after i click 'ok', alert() will keep getting called every time I press 'c' without the modifier.


reset _mod values to false every time the window is focused. i experimented with document vs window, and focus vs blur, and window focus is the only event that works for every scenario. tested on Chrome/FF/Safari.

@madrobby madrobby merged commit e9c78d3 into madrobby:master
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Commits on Nov 6, 2011
  1. @lowe

    reset modifiers to false on window focus. fixes issues with alt+tab, …

    lowe authored
    …switching browser tabs with the keyboard, etc
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Showing with 11 additions and 0 deletions.
  1. +11 −0 keymaster.js
11 keymaster.js
@@ -94,6 +94,14 @@
+ function resetModifiers() {
+ for (k in _mods) {
+ if (_mods.hasOwnProperty(k)) {
+ _mods[k] = false;
+ }
+ }
+ }
// parse and assign shortcut
function assignKey(key, scope, method){
var keys, mods, i, mi;
@@ -144,6 +152,9 @@
addEvent(document, 'keydown', dispatch);
addEvent(document, 'keyup', clearModifier);
+ // reset modifiers to false whenever the window is (re)focused.
+ addEvent(window, 'focus', resetModifiers);
// set window.key and window.key.setScope
global.key = assignKey;
global.key.setScope = setScope;
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