event util
# EventUtil
프론트엔드 개발자를 위한 자바스크립트 프로그래밍 발췌
```javascript var EventUtil = {
addHandler: function(element, type, handler){ if (element.addEventListener){ element.addEventListener(type, handler, false); } else if (element.attachEvent){ element.attachEvent("on" + type, handler); } else { element["on" + type] = handler; } },
getButton: function(event){ if (document.implementation.hasFeature("MouseEvents", "2.0")){ return event.button; } else { switch(event.button){ case 0: case 1: case 3: case 5: case 7: return 0; case 2: case 6: return 2; case 4: return 1; } } },
getCharCode: function(event){ if (typeof event.charCode == "number"){ return event.charCode; } else { return event.keyCode; } },
getClipboardText: function(event){ var clipboardData = (event.clipboardData || window.clipboardData); return clipboardData.getData("text"); },
getEvent: function(event){ return event ? event : window.event; },
getRelatedTarget: function(event){ if (event.relatedTarget){ return event.relatedTarget; } else if (event.toElement){ return event.toElement; } else if (event.fromElement){ return event.fromElement; } else { return null; }
},
getTarget: function(event){ return event.target || event.srcElement; },
getWheelDelta: function(event){ if (event.wheelDelta){ return (client.engine.opera && client.engine.opera < 9.5 ? -event.wheelDelta : event.wheelDelta); } else { return -event.detail * 40; } },
preventDefault: function(event){ if (event.preventDefault){ event.preventDefault(); } else { event.returnValue = false; } },
removeHandler: function(element, type, handler){ if (element.removeEventListener){ element.removeEventListener(type, handler, false); } else if (element.detachEvent){ element.detachEvent("on" + type, handler); } else { element["on" + type] = null; } },
setClipboardText: function(event, value){ if (event.clipboardData){ event.clipboardData.setData("text/plain", value); } else if (window.clipboardData){ window.clipboardData.setData("text", value); } },
stopPropagation: function(event){ if (event.stopPropagation){ event.stopPropagation(); } else { event.cancelBubble = true; } }
}; ```