/**
* 跨浏览器事件处理工具。只支持冒泡。不支持捕获
* @author (qiu_deqing@126.com)
*/
var EventUtil = {
getEvent: function (event) {
return event || window.event;
},
getTarget: function (event) {
return event.target || event.srcElement;
},
// 返回注册成功的监听器,IE中需要使用返回值来移除监听器
on: function (elem, type, handler) {
if (elem.addEventListener) {
elem.addEventListener(type, handler, false);
return handler;
} else if (elem.attachEvent) {
var wrapper = function () {
var event = window.event;
event.target = event.srcElement;
handler.call(elem, event);
};
elem.attachEvent('on' + type, wrapper);
return wrapper;
}
},
off: function (elem, type, handler) {
if (elem.removeEventListener) {
elem.removeEventListener(type, handler, false);
} else if (elem.detachEvent) {
elem.detachEvent('on' + type, handler);
}
},
preventDefault: function (event) {
if (event.preventDefault) {
event.preventDefault();
} else if ('returnValue' in event) {
event.returnValue = false;
}
},
stopPropagation: function (event) {
if (event.stopPropagation) {
event.stopPropagation();
} else if ('cancelBubble' in event) {
event.cancelBubble = true;
}
},
/**
* keypress事件跨浏览器获取输入字符
* 某些浏览器在一些特殊键上也触发keypress,此时返回null
**/
getChar: function (event) {
if (event.which == null) {
return String.fromCharCode(event.keyCode); // IE
}
else if (event.which != 0 && event.charCode != 0) {
return String.fromCharCode(event.which); // the rest
}
else {
return null; // special key
}
}
};
参考:
DOM 事件模型是如何的, 编写一个 EventUtil 工具类实现事件管理兼容