jQuery : Get the index of non-siblings elements of the closest class

Question

我正在尝试获取特定类中非同级 input[type='text'] 元素的索引。这是代码:

<form class="myForms">
<input class="myClass" type="text" /> -> expected value 0
<input class="myClass" type="text" /> -> expected value 1
<input class="myClass" type="text" /> -> expected value 2
</form>

<form class="myForms">
<input class="myClass" type="text" />  -> expected value 0
<input class="myClass" type="text" /> -> expected value 1
<input class="myClass" type="text" /> -> expected value 2
<input class="myClass" type="hidden" /> 
<input class="myClass" type="text" /> -> expected value 3
</form>

<form class="myForms">
<input class="myClass" type="text" /> -> expected value 0
<input class="myClass" type="text" /> -> expected value 1
<input class="myClass" type="hidden" />
<input class="myClass" type="text" /> -> expected value 2
<input class="myClass" type="text" /> -> expected value 3
 </form>

<form class="myForms">
<input class="myClass" type="text" /> -> expected value 0
<input class="myClass" type="text" /> -> expected value 1
</form>

<form class="myForms">
<input class="myClass" type="text" /> -> expected value 0
<input class="myClass" type="text" /> -> expected value 1
<input class="myClass" type="hidden" /> 
<input class="myClass" type="hidden" /> 
<input class="myClass" type="text" /> -> expected value 2
</form>

我尝试了这个 Jquery 代码:

$(document).on("keyup","input[type='text']",function(e){

var elem = $(this);
var theClosest = elem.closest('.myForms');

// And then :
console.log(elem.index(theClosest));

});

// But, I'm wrong : it always returns -1 

我该如何解决这个问题？

非常感谢您的帮助!

Answer 1

您需要从表单内的文本输入中搜索索引，因此获取输入并应用 index() 以元素为参数的方法。您也可以使用 :text 伪类来选择文本输入，这有助于减少代码。

$(document).on("keyup", ":text", function(e) {
  var elem = $(this),
    form = $(this).closest('.myForms');
  console.log(form.find(':text').index(elem));
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<form class="myForms">
  <input class="myClass" type="text" />
  <input class="myClass" type="text" />
  <input class="myClass" type="text" />
</form>

<form class="myForms">
  <input class="myClass" type="text" />
  <input class="myClass" type="text" />
  <input class="myClass" type="text" />
  <input class="myClass" type="hidden" />
  <input class="myClass" type="text" />
</form>

<form class="myForms">
  <input class="myClass" type="text" />
  <input class="myClass" type="text" />
  <input class="myClass" type="hidden" />
  <input class="myClass" type="text" />
  <input class="myClass" type="text" />
</form>

<form class="myForms">
  <input class="myClass" type="text" />
  <input class="myClass" type="text" />
</form>

<form class="myForms">
  <input class="myClass" type="text" />
  <input class="myClass" type="text" />
  <input class="myClass" type="hidden" />
  <input class="myClass" type="hidden" />
  <input class="myClass" type="text" />
</form>