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jquery uses data method to get events on an element_jquery

WBOY
WBOYOriginal
2016-05-16 16:43:201241browse

JQuery’s events bound to elements can be retrieved using the data method

Get it through $(element).data("events")

// 比如给一个button绑定两个click事件

$("button").click(function() { alert("1") });
$("button").click(function() { alert("2") });

// 这个时候点击该button会分别弹出 2 和1的alert框
// 取出该button的所有click事件，是个数组
$("button").data('events').click

You will see two arrays of click events

Get the array, you can adjust the order and then set it back

$("button").data('events').click = newEventArray;

The following is the test page for this method: 

<span style="font-size:18px;"><%@ page contentType="text/html;charset=UTF-8" language="java" %> 

<!DOCTYPE HTML> 
<html> 
<head> 
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
<html xmlns="http://www.w3.org/1999/xhtml"> 
<head> 
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> 
<title>测试jquery动态改变事件</title> 

<script type="text/javascript" src="/static/lib/jquery-1.6.2.min.js"></script> 
<script type="text/javascript" src="/static/lib/jquery.cookie.min.js"></script> 
<script type="text/javascript" src="/static/lib/util.min.js"></script> 
<script type="text/javascript" src="/static/lib/jquery.bgiframe.min.js"></script> 
<script type="text/javascript" src="/static/lib/jshashtable.min.js"></script> 
</head> 
<body> 
<h1>该demo用于测试jquery附加了事件以后可不可以动态改变事件有无，及顺序</h1> 
<input id="btn" type="button" value="点击我执行事件,分别执行三个次序弹窗"/><br/> 
<input id="btn_clear" type="button" value="点击清空执行事件，清空后第一个按钮无反应"/><br/> 
<input id="btn_revert" type="button" value="点击还原执行事件，点击后第一个按钮又会有反应"/><br/> 
<input id="btn_seq" type="button" value="点击我改变执行事件顺序，顺序会改变"/><br/> 
<script type="text/javascript"> 
$(document).ready(function(){ 
$("#btn").click(function(){ 
alert(1); 
}); 
$("#btn").click(function(){ 
alert(2); 
}); 
$("#btn").click(function(){ 
alert(3); 
}); 
var _arr_events= $("#btn").data("events")["click"]; 
$("#btn_clear").click(function(){ 
$("#btn").data("events")["click"]=undefined; 
}); 
$("#btn_revert").click(function(){ 
$("#btn").data("events")["click"]=_arr_events; 
}); 

}); 
</script> 
</body> 
</html> 
</span>
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