js添加事件、移除事件、阻止冒泡、阻止浏览器默认行为等写法(兼容IE/FF/CHROME)

转自:http://blog.csdn.net/itchiang/article/details/7769341

 

添加事件
 
var addEvent = function( obj, type, fn ) {
  if (obj.addEventListener)
      obj.addEventListener( type, fn, false );
  else if (obj.attachEvent) {
      obj["e"+type+fn] = fn;
      obj.attachEvent( "on"+type, function() {
          obj["e"+type+fn].call(obj, window.event);
      } );
  }
};
移除事件
 
var removeEvent = function( obj, type, fn ) {
  if (obj.removeEventListener)
      obj.removeEventListener( type, fn, false );
  else if (obj.detachEvent) {
      obj.detachEvent(  "on" +type, obj["e"+type+fn] );
      obj["e"+type+fn] = null;
  }
};
 
 
阻止事件(包括冒泡和默认行为)
 
var stopEvent = function(e){
    e = e || window.event;
    if(e.preventDefault) {
      e.preventDefault();
      e.stopPropagation();
    }else{
      e.returnValue = false;
      e.cancelBubble = true;
    }
  },
 
仅阻止事件冒泡
 
var stopPropagation = function(e) {
   e = e || window.event;
  if (!+"\v1″) {
     e.cancelBubble = true;
  } else {
     e.stopPropagation();
  }
}
 
 
仅阻止浏览器默认行为

var  preventDefault  = function(e) {
    e = e || window.event;
    if(e.preventDefault) {
      e.preventDefault();
    }else{
      e.returnValue = false;
    }
}

取得事件源对象
 
var getEventTarget = function(e){
   e = e || window.event;
  var target = event.srcElement ? event.srcElement : event.target;
  return target;
}
 
附:绑定onpropertychange事件
onpropertychange,它在一个元素的属性发生变化的时候触发,一般用在表单元素中捕获其value值改变,它比onchange事件更实时捕获它的改变,不过为微软私有事件。FF大致和它相似的有oninput事件,不过它只针对textfield与textarea的value属性。safari,firefox,chrome与 opera都支持此事件。
 
var addPropertyChangeEvent = function (obj,fn) {
  if(window.ActiveXObject){
      obj.onpropertychange = fn;
  }else{
      obj.addEventListener("input",fn,false);
  }
}
posted @ 2014-04-23 21:31  火光闪耀  阅读(480)  评论(0编辑  收藏  举报