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books/client/ui/keyboard.js
2018-02-19 22:11:10 +05:30

40 lines
890 B
JavaScript

module.exports = {
bindKey(element, key, listener) {
element.addEventListener('keydown', (e) => {
if (key === this.getKey(e)) {
listener(e);
}
})
},
getKey(e) {
var keycode = e.keyCode || e.which;
var key = this.keyMap[keycode] || String.fromCharCode(keycode);
if(e.ctrlKey || e.metaKey) {
// add ctrl+ the key
key = 'ctrl+' + key;
}
if(e.shiftKey) {
// add ctrl+ the key
key = 'shift+' + key;
}
return key.toLowerCase();
},
keyMap: {
8: 'backspace',
9: 'tab',
13: 'enter',
16: 'shift',
17: 'ctrl',
91: 'meta',
18: 'alt',
27: 'escape',
37: 'left',
39: 'right',
38: 'up',
40: 'down',
32: 'space'
},
}