Append element as sibling after element?

Question

How do I add a text after an HTML element using pure Javascript? There is appendChild but this adds it within the element. I would instead like to add it as a sibling after the element like this:

<img id="myimg" src="..." />

<script>
  var myimg = document.getElementById('myimg');
  myimg.appendAFTER('This is my caption.'); //pseudo-code and doesn't really work
</script>

I would like to end up with this:

<img id="myimg" src="..." />
This is my caption.

What is the Javascript equivalend of after() from jQuery?

Answer 1

Check out Node.insertBefore() and Node.nextSibling (fiddle):

var myimg = document.getElementById('myimg');
var text = document.createTextNode("This is my caption.");
myimg.parentNode.insertBefore(text, myimg.nextSibling)

or Element.insertAdjacentHTML() (fiddle):

var myimg = document.getElementById('myimg');
myimg.insertAdjacentHTML("afterend", "This is my caption.");

Answer 2

Please use the following code:

<img id="myimg" src="..." />

<script>
  var myimg = document.getElementById('myimg');
  var txt=document.createElement("span");
  txt.innerHTML="Whatever text you want to write . . .";
  if(myimg.nextSibling){
    myimg.parentNode.insertBefore(txt,myimg.nextSibling);
  }else{
    myimg.parentNode.appendChild(txt);
  }
</script>