Performance JS-Function

[beatovich]

hallo

Der folgende Code wird bei jedem Keydown Event (auf body registriert) ausgeführt:

var bindings={
	"7:ArrowDown":"MOVE_SELECTED_LINES_DOWN",
	"7:ArrowUp":"MOVE_SELECTED_LINES_UP",
	"7:ArrowLeft":"OUTDENT_SELECTED_LINES",
	"7:ArrowRight":"INDENT_SELECTED_LINES",
	"1:Tab":"INSERT_TAB",
	"4:u":"SELECT_URL_BAR",
	"4: ":"SELECT_TEXTAREA",
	"4:h":"OPEN_HELP",
	"4:m":"OPEN_MENU_MORE",
	"4:-":"SELECT_MENU_SECTION",
	"4:p":"UPDATE_PREVIEW",
	"5:<":"INPUT_HTML_ELEMENT",
	"5:f":"OPEN_SEARCH_DIALOG",
	"5:d":"DUPLICATE_SELECTED_LINES",
	"5:e":"ENCODE_HTML",
};

var keyFunction={
	"ENCODE_HTML":function(){
		alert("ENCODE_HTML")
	},
};

function keyController(ev, code){
	//console.log(ev);
	code = 0
		+ (ev.target == ta ? 1 : 0)
		+ (ev.shiftKey ? 2 : 0)
		+ (ev.ctrlKey ? 4 : 0)
		+ (ev.altKey ? 8 : 0);
	code += ":" + ev.key;
	if( bindings[code] !== undefined ){
	   //console.log(code);
		ev.preventDefault();
		ev.stopPropagation();
		keyFunction[bindings[code]]();
	}
}
~~~

Die Funktion soll möglichst performant sein.

Hat jemand eine Verbesserungsidee?

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