Finding DOM node index

Question

I want find the index of a given DOM node. It\'s like the inverse of doing

document.getElementById(\'id_of_element\').childNodes[K]

I want

Answer 1

I think the only way to do this is to loop through the parent's children until you find yourself.

var K = -1;
for (var i = myNode.parent.childNodes.length; i >= 0; i--)
{
    if (myNode.parent.childNodes[i] === myNode)
    {
        K = i;
        break;
    }
}

if (K == -1)
    alert('Not found?!');