将div添加为节点的唯一子节点

Question

I am trying to add div as only child to a node. and if that node already has any children make them children of the div.

original DOM looks like:

<a href = "">
  <span id="gsp" > </span>
  <span id="gbsp"> some text </span>
</a>

I want the output to be:

<a href = "">
  <div id="oaa_web_accessibility_highlight">  
    <span id="gsp" > </span>
    <span id="gbsp"> some text </span>
  </div>
</a>

instead, below snippet gives me:

<a href = "">
  <div id="oaa_web_accessibility_highlight">  </div>
    <span id="gsp" > </span>
    <span id="gbsp"> some text </span>
</a>

I am trying to use the below snippet, but it is not working.

var new_div_element = this.document.createElement('div');
new_div_element.id = 'oaa_web_accessibility_highlight';
node.insertBefore(new_div_element, node.childNodes[0]);
for (var i =0; i < node.childNodes.length; i++) {  
  if (i == 0) continue;        
  node.childNodes[0].appendChild(node.childNodes[i]);        
}

please can anyone help me on this?

Answer 1

Do it like this:

var new_div_element = document.createElement('div');
new_div_element.id = 'oaa_web_accessibility_highlight';

while (node.firstChild) {  
      new_div_element.appendChild(node.firstChild);        
}

node.appendChild(new_div_element);

This empties the children of node into new_div_element , and then appends new_div_element to the now empty node .

It doesn't use innerHTML , so you're not destroying any state of the elements being transferred.

---

FYI, the reason yours didn't work properly was that your loop is incrementing i , but you're removing elements from the .childNodes list when you do the .appendChild .

Since .childNodes is a live list, its content is updated when you move one of its items to a different location. As a result, after the first child is removed, the second child takes its place at that index. Since your i is incremented, it skips passed the one(s) that were relocated in the list.

Answer 2

如果您愿意使用jQuery，它有一个wrapAll方法可以为您执行此操作。

$(node).children().wrapAll('<div id="oaa_web_accessibility_highlight"></div>');