在jquery中使用id作为对象。

I have a method which take obj as parameter. I can't change the signature and I wan to reuse it. I have to send an element as object to this parameter so not sure how to do it. Can anyone show me?

我有一个方法把obj作为参数。我不能更改签名，我要重新使用它。我必须将一个元素作为对象发送给这个参数，所以不知道该怎么做。谁能告诉我?

function someUsefulFunction(obj) {
  var id = obj.id;
  //do other stuff
}

{
  ...
  var myElement = $('#myElement');
   someUsefulFunction(myElement); //getting error "TypeError: obj.id is undefined"
  ...
}

2 个解决方案

#1

var myElement = document.getElementById('myElement');

looks like its expecting a dom node, so you can do this the old fashioned plain js way.

看起来它希望有一个dom节点，所以您可以使用老式的普通js方式来实现这一点。

or if you want to do it with jquery,

如果你想用jquery，

var myElement = $('#myElement').get(0);

#2

You need to change to this:

你需要改变一下:

var id = obj[0].id;

function someUsefulFunction(obj) {
  var id = obj.id;
  console.log(id);
}

var myElement = $('#myElement').get(0);
someUsefulFunction(myElement);

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="myElement"></div>

Alternative you can:

选择您可以:

var myElement = $('#myElement').get(0);

function someUsefulFunction(obj) {
  var id = obj[0].id;
  console.log(id);
}

var myElement = $('#myElement');
someUsefulFunction(myElement);

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="myElement"></div>

#1

var myElement = document.getElementById('myElement');