js event handler cross-browser solution_javascript skills
The example in this article shares the js event handler cross-browser solution for your reference. The specific content is as follows
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title></title>
</head>
<body>
<div>
<input type="button" id="button1" value="按钮" />
</div>
<script type="text/javascript">
function show(){
alert("Hello world!");
}
//声明一个对象
var eventUtil={
//添加句柄
addHandler:function(element,type,handler){
//DOM2级事件处理判断
if(element.addEventListener){
element.addEventListener(type,handler,false);
}else if(element.attachEvent){//IE事件处理判断
element.attachEvent('on'+type,handler);
}else{//DOM0级事件判断
element['on'+type]=handler;
}
},
//删除句柄
removeHandler:function(element,type,handler){
//DOM2级事件处理判断
if(element.removeEventListener){
elememt.removeEventListener(type,handler,false);
}else if(element.detachEvent){//IE事件处理判断
element.detachEvent('on'+type,handler);
}else{//DOM0级事件判断
element['on'+type]=null;
}
}
}
eventUtil.addHandler(button3,'click',show);
</script>
</body>
</html>
I will share with you the cross-browser code for js native event processing:
//跨浏览器的事件处理器添加方式
var EventUtil = {
addHandler : function(elem, type, handler){
if(elem.addEventListener){
elem.addEventListener(type, handler, false);
}
else if(elem.attachEvent){
elem.attachEvent("on" + type, handler);//添加多个同一类型的handler时，IE方式的规则是最后添加的最先触发
}
else{
if(typeof elem["on" + type] === 'function'){
var oldHandler = elem["on" + type];
elem["on" + type] = function(){
oldHandler();
handler();
}
}
else{
elem["on" + type] = handler;//支持添加多个事件处理器
}
}
},
getEvent : function(event){
return event ? event : window.event;
},
getTarget : function(event){
return event.target || event.srcElement;
},
preventDefault : function(event){
if(event.preventDefault){
event.preventDefault();
}
else{
event.returnValue = false;
}
},
removeHandler : function(elem, type, handler){
if(elem.removeEventListener){
elem.removeEventListener(type, handler, false);
}
else if(elem.detachEvent){
elem.detachEvent("on" + type, handler);
}
else{
elem["on" + type] = null;//不支持移除单一事件处理器，只能全部移除
}
},
stopPropagation : function(event){
if(event.stopPropagation){
event.stopPropagation();
}
else{
event.cancelBubble = true;
}
},
getRelatedTarget : function(event){
if(event.relatedTarget){
return event.relatedTarget;
}
else if(event.toElement && event.type == "mouseout"){
return event.toElement;
}
else if(event.fromElement && event.type == "mouseover"){
return event.fromElement;
}
else{
return null;
}
},
/*IE8点击左键和中键都是0；FF无法识别中键；Chrome正常*/
getButton : function(event){//返回0，1，2 - 左，中，右
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;
break;
case 2:case 6:
return 2;
break;
case 4:
return 1;
break;
default:
break;
}
}
},
/*只能检测keypress事件，返回值等于将要显示的字符编码*/
/*IE和Chrome只有能显示的字符键才触发，FF其它键也能触发，返回值为0*/
getCharCode : function(event){
if(typeof event.charCode == "number"){
return event.charCode;
}
else{
return event.keyCode;
}
}
};
The above is the entire content of this article. I hope it will be helpful to everyone in solving the problem of js event handler cross-browser.
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