insertAfter，然后删除上一个元素

Question

Getting some weird behavior with a piece of code that's supposed to do simple DOM manipulation:

b.detach();
b.insertAfter(a);
a.remove();

Initially the HTML looks like

<a>
  <b> </b>
</a>

(if it matters, I'm using b.wrap('<a></a>') to build it)

After that code runs it's supposed to move b after a :

<a></a>
<b></b>

then remove a :

<b></b>

but it doesn't. Instead a remains there and b just disappears. Any ideas on what could be wrong?

I tried using after() instead, reversing arguments, but getting the same result.

Answer 1

remove b.detach() b.insertAfter(a); will move it

Answer 2

I'm not sure what you mean, if I try it, it works the way you want it:

http://jsfiddle.net/8wy7v/

HTML:

<div id="test">
    <a>
        Test <b>Test</b>
    </a>
</div>

<button id="change_dom">manipulate</button>
<br />
<textarea id="result"></textarea>

JS:

$(document).ready(function(){
    $('#change_dom').click(function(){
        var a = $('a'),
            b = $('b');

        b.detach();
        b.insertAfter(a);
        a.remove();

        $('#result').val($('#test').html());
    });
});

Update:

This is how it can be done in the scenario described in this fiddle: http://jsfiddle.net/8wy7v/1/

var list = b.parents('ul')
b.insertAfter(list);
list.remove();

Answer 3

The reason is that wrap does clone the elements - so what is referenced by a never actually contains b . Btw, the detach is superfluous, as elements will be automatically removed when inserted elsewhere in the DOM.

So to get the a after which to insert, you will need to reselect it (eg by b.parent() ).