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How to check if an element is bound to an event in jquery
- coldplay.xixiOriginal
- 2020-12-07 10:06:203104browse
Jquery method to check whether an element is bound to an event: 1. In previous versions, you can use the [obj.data('event');] method; 2. JQuery 1.8 version cancels the [obj.data] method. Change to the [$._data] method.
The operating environment of this tutorial: windows7 system, jquery1.8 version, Dell G3 computer.
Jquery method to check whether an element is bound to an event:
On previous versions, you could call it like for other data:
obj.data ('events');
In jQuery 1.8, this direct access was removed, so in recent versions you must call it like this :
$._data(obj[0],"events")
Previous versions can useobj.data ('event'); JQuery1.8 version canceled the obj.data method and changed it to $._datamethod
Note:$._data(obj[0 ], "event") obj[0] must be added with the array[0] subscript, otherwise the data will not be obtained
-------The following is an example
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title></title>
<script src="/jquery-easyui-1.3.2/jquery-1.8.0.min.js" type="text/javascript"></script>
<script type="text/javascript">
$(function () {
$("#btnTest").click(function () { alert('aa'); });
$("#btn").click(function () {
//判断是否绑定了click事件
var objEvt = $._data($("#btnTest")[0], "events");
if (objEvt && objEvt["click"]) {
//console.info(objEvt["click"]);
alert("bind click");
}
else {
alert("Not bind click");
}
});
});
</script>
</head>
<body>
<input type="button" id="btn" value="测试是否绑定事件" />
<input type="button" id="btnTest" value="被测试按钮" />
</body>
</html>Related learning recommendations: javascript video tutorial
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