offset in javascript code example

Example 1: offset in js

var d = document.getElementById("div1");
var topPos = d.offsetTop;
 
if (topPos > 10) {
  // object is offset more
  // than 10 pixels from its parent
}

Example 2: Get the position of a div/span tag

function getPos(el) {
    // yay readability
    for (var lx=0, ly=0;
         el != null;
         lx += el.offsetLeft, ly += el.offsetTop, el = el.offsetParent);
    return {x: lx,y: ly};
}