Javascript 如何检查元素是否具有点击处理程序？
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How to check if element has click handler?
提问by kostepanych
Possible Duplicate:
test if event handler is bound to an element in jQuery
Tried to do the following (link is jQuery object of 'a' tag):
尝试执行以下操作（链接是 'a' 标签的 jQuery 对象）：
link.data("events") //undefined even if link has event handlers
jQuery.data(link, 'events') //undefined always also
jQuery._data(link, 'events') //undefined always also
using jquery-1.8.3
使用 jquery-1.8.3
So, how to check if element has click handler?
那么，如何检查元素是否有点击处理程序？
回答by Snuffleupagus
You can use jQuery._datato check for events. The first argument should be a reference to the HTML element, not the jQuery object.
您可以使用jQuery._data来检查事件。第一个参数应该是对 HTML 元素的引用，而不是 jQuery 对象。
var ev = $._data(element, 'events');
if(ev && ev.click) alert('click bound');
Sample below.
示例如下。
$(function(){
$('#test').click(function(){
// NOTE: this below is refering to the HTML element, NOT the jQuery element
var ev = $._data(this, 'events');
if(ev && ev.click) alert('click bound to this button');
});
});<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
<button id="test">Click me to check for click handlers</button>Also note that this method for checking events will only work when the event is bound via jQuery. If the event is bound via element.attachEventListener, element.onclick, <a onclick="doStuff()">or any other non jQuery way, this will not work. If you're fitting into this boat, check this answer.
另请注意，此检查事件的方法仅在通过 jQuery 绑定事件时才有效。如果该事件是通过约束element.attachEventListener，element.onclick，<a onclick="doStuff()">或者任何其他非jQuery的方式，这是不行的。如果您适合这艘船，请查看此答案。
