How can i duplicate a div onclick with javascript?

Question

I want a div to be duplicated when a button is clicked. I though something like this; but it's not working. Can anyone help me?

HTML

<div id="duplicater"> 
duplicate EVERYTHING INSIDE THIS DIV
</div>

JAVASCRIPT

function duplicate()
{
var div = duplicate("div");
    div.id = "duplicater";
div.appendChild(duplicate("duplicater"));
}

Answer 1

You are creating an infinite recursion!

function duplicate()
{
    var div = duplicate("div");

The function is calling itself over and over again. Use cloneNode():

HTML:

<div id="duplicater0"> 
duplicate EVERYTHING INSIDE THIS DIV
</div>

JavaScript:

var i = 0;

function duplicate() {
    var original = document.getElementById('duplicater' + i);
    var clone = original.cloneNode(true); // "deep" clone
   clone.id = "duplicater" + ++i; // there can only be one element with an ID
    clone.onclick = duplicate; // event handlers are not cloned
    original.parentNode.appendChild(clone);
}

Working DEMO

Or without IDs:

function duplicate() {
    var clone = this.cloneNode(true); // "deep" clone
    clone.id = ""; // there can only be one element with an ID
    clone.onclick = duplicate; // event handlers are not cloned
    this.parentNode.appendChild(clone);
}

Update:

If you want to clone the div on button click, you can use a slightly different version:

HTML:

<button id="button" onclick="duplicate()">Click me</button>
<div id="duplicater"> 
    duplicate EVERYTHING INSIDE THIS DIV
</div>

JavaScript:

var i = 0;
var original = document.getElementById('duplicater');

function duplicate() {
    var clone = original.cloneNode(true); // "deep" clone
    clone.id = "duplicater" + ++i;
    // or clone.id = ""; if the divs don't need an ID
    original.parentNode.appendChild(clone);
}

If you are not in a form, you should use <button> instead of <input type="button">.

Working DEMO 2

Answer 2

Can you change the div to a class? If so, then this might work for you:

# application.js
$(function(){
  $('.photo:last').after('<a href="#" id="new_resource">Add another image<a/><br/>');

  $('a[href=#]').click(function(){
    $(this).before($('.photo:last').clone());

    $('.photo:last input').each(function(){
      $(this).removeAttr("value");
    });

    $('.photo:last input[type=hidden]').remove();

    return false;
  });
})

#html
<div class="photo"
  <label>label</label>  
  <input type="file"></input>
</div>

Edit the code here:

Answer 3

<table>
<tr>
<td>
<div id="duplicater"> 
    duplicate EVERYTHING INSIDE THIS DIV
</div>
</td>
</tr>
</table>
<button id="button">Click me</button>

$("#button").on('click', function (e) {
    e.preventDefault();
    var $self = $(this);
    $self.before($self.prev('table').clone());
});