Question

With JavaScript I want to remove a specific DOM node and replace it with the innerHTML. For example I want to change

<div>
...
   <div id="t1">
        this is <b> the text </b> I want to remain.
   </div>
...
</div>

To

<div>
...
    this is <b> the text </b> I want to remain.
...
</div>

Answer 1

Try this:

var oldElem = document.getElementById('t1');
oldElem.innerHTML = 'this is <b> the text </b> I want to remain.';
var parentElem = oldElem.parentNode;
var innerElem;

while (innerElem = oldElem.firstChild)
{
  // insert all our children before ourselves.
  parentElem.insertBefore(innerElem, oldElem);
}
parentElem.removeChild(oldElem);

There is a demo here.

This is effectively the same thing as .replaceWith() from jQuery:

$("#t1").replaceWith('this is <b> the text </b> I want to remain.');