chrome是否支持“addeventlistener”?
Does chrome support "addEventListener"?
当我使用chrome测试跨浏览器事件处理时,该功能不起作用。它说"未捕获的类型错误:不能读取属性'addEventListener'的null"。据我所知,chrome支持"addEventListener"功能,但它无法识别该功能。这是我的代码。
<!DOCTYPE html>
<html>
<head>
<title>event test</title>
</head>
<body>
<script type="text/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;
}
},
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;
}
}
};
var btn = document.getElementById('myBtn');
var handler1 = function(){
alert("Hello!");
};
EventUtil.addHandler(btn,"click",handler1);
</script>
<input type="button" name="mybutton" id="myBtn" value="myButton">
</body>
</html>
代码有什么问题?如何解决这个问题?
它不起作用,因为input标签被放置在script标签下面,代码将在创建元素之前执行,所以什么都不起作用。你可以通过在输入标签下添加script标签或者添加window。onload(){'这是你的指令}来解决这个问题,你可以把你需要执行的东西放进去,你可以在任何地方初始化函数但这里是你调用它们的地方
在页面加载后执行javascript代码或将其放置在html
的末尾<!DOCTYPE html>
<html>
<head>
<title>event test</title>
</head>
<body>
<input type="button" name="mybutton" id="myBtn" value="myButton">
</body>
<script type="text/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;
}
},
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;
}
}
};
var btn = document.getElementById('myBtn');
var handler1 = function(){
alert("Hello!");
};
EventUtil.addHandler(btn,"click",handler1);
</script>
</html>
使用jQuery,你可以这样做:
<script type="text/javascript">
$(document).ready(function() {
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;
}
},
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;
}
}
};
var btn = document.getElementById('myBtn');
var handler1 = function(){
alert("Hello!");
};
EventUtil.addHandler(btn,"click",handler1);
};
</script>
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