Finding Element's Position Relative to the Document

Finding element's position relative to the document

You can traverse the offsetParent up to the top level of the DOM.

function getOffsetLeft( elem )
{
    var offsetLeft = 0;
    do {
      if ( !isNaN( elem.offsetLeft ) )
      {
          offsetLeft += elem.offsetLeft;
      }
    } while( elem = elem.offsetParent );
    return offsetLeft;
}

Get position/offset of element relative to a parent container?

element.offsetLeft and element.offsetTop give an element's position with respect to its offsetParent (which is the nearest parent element with a position of relative or absolute.)

jQuery get the location of an element relative to window

Initially, Grab the .offset position of the element and calculate its relative position with respect to window

Refer :

1. offset

2. scroll

3. scrollTop

You can give it a try at this fiddle

Following few lines of code explains how this can be solved

when .scroll event is performed, we calculate the relative position of the element with respect to window object

$(window).scroll(function () {
    console.log(eTop - $(window).scrollTop());
});

when scroll is performed in browser, we call the above event handler function

code snippet

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function log(txt) {  $("#log").html("location : <b>" + txt + "</b> px")}
$(function() {  var eTop = $('#element').offset().top; //get the offset top of the element  log(eTop - $(window).scrollTop()); //position of the ele w.r.t window
  $(window).scroll(function() { //when window is scrolled    log(eTop - $(window).scrollTop());  });});

#element {  margin: 140px;  text-align: center;  padding: 5px;  width: 200px;  height: 200px;  border: 1px solid #0099f9;  border-radius: 3px;  background: #444;  color: #0099d9;  opacity: 0.6;}#log {  position: fixed;  top: 40px;  left: 40px;  color: #333;}#scroll {  position: fixed;  bottom: 10px;  right: 10px;  border: 1px solid #000;  border-radius: 2px;  padding: 5px;}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script><div id="log"></div>
<div id="element">Hello  <hr>World</div><div id="scroll">Scroll Down</div>

Using jquery to get element's position relative to viewport

Look into the Dimensions plugin, specifically scrollTop()/scrollLeft(). Information can be found at http://api.jquery.com/scrollTop.

Javascript get an Element's position relative to the screen's top left corner

Using the jQuery .offset() function, you can get the coordinates of the top-left of the browser page:

var offset = $("selector").offset();

Combining that with the Javascript window.screenX and window.screenY window properties, you can calculate the position of the element as an offset from the top/left of the screen:

var screenY = offset.top + window.screenX;
var screenX = offset.left + window.screenY; 

Note that window.screenX and window.screenY are standard in most browsers, but IE versions 8 and prior use window.screenTop and window.screenLeft, instead. If you need compatibility with IE8 or earlier, make sure to take that into account.

Also note that you might need to account for the current scroll position, in which case, you would use the jQuery .scrollTop() and .scrollLeft() methods and subtract from the offset value.

Unfortunately, this will not take window borders or toolbars into account. To do that, you can capture a mouse move and store the mouse position, which is given in actual screen coordinates.

The core of this solution is the following, which installs a one-time-use mouse handler to determine the actual screen coordinates of the page:

var pageX;
var pageY;

window.onmousemove = setMouseCoordinates;

function setMouseCoordinates (e) {
    window.onmousemove = null;

    pageX = e.screenX - e.clientX;
    pageY = e.screenY - e.clientY;
}

Then, you can use those stored values to calculate the offset of any Javascript element:

x = pageX + elem.offsetLeft;
y = pageY + elem.offsetTop;

or jQuery element:

x = pageX + elem.position().left;
y = pageY + elem.position().top;

Check out the fiddle to see it in action: https://jsfiddle.net/mgaskill/bpqzct3f/

Element's coordinates relative to its parent

You can use getBoundingClientRect(), simply subtracting the coordinates of the parent:

const parentPos = document.getElementById('parent-id').getBoundingClientRect();
const childPos  = document.getElementById('child-id').getBoundingClientRect();
const relativePos = {};

relativePos.top    = childPos.top - parentPos.top,
relativePos.right  = childPos.right - parentPos.right,
relativePos.bottom = childPos.bottom - parentPos.bottom,
relativePos.left   = childPos.left - parentPos.left;

console.log(relativePos);
// something like: {top: 50, right: -100, bottom: -50, left: 100}

Now you have the coordinates of the child relative to its parent.

Note that if the top or left coordinates are negative, it means that the child escapes its parent in that direction. Same if the bottom or right coordinates are positive.

Working example

var parentPos = document.getElementById('parent-id').getBoundingClientRect(),
    childPos = document.getElementById('child-id').getBoundingClientRect(),
    relativePos = {};

relativePos.top = childPos.top - parentPos.top,
relativePos.right = childPos.right - parentPos.right,
relativePos.bottom = childPos.bottom - parentPos.bottom,
relativePos.left = childPos.left - parentPos.left;

console.log(relativePos);

#parent-id {
    width: 300px;
    height: 300px;
    background: grey;
}

#child-id {
    position: relative;
    width: 100px;
    height: 200px;
    background: black;
    top: 50px;
    left: 100px;
}

<div id="parent-id">
    <div id="child-id"></div>
</div>

Get coordinates of element relative to enclosing svg

As I said in my comment, you can use getBoundingClientRect for this:

<!DOCTYPE html><html>
  <head>  </head>
  <body>    <svg width="500" height="500">      <g transform="translate(100,100)rotate(45)">        <text id="myText" x="10" y="10" style="fill:red">Hi Mom!</text>      </g>    </svg>    <script>      var rect = document.getElementById("myText").getBoundingClientRect();      console.log("position is " + rect.top + "," + rect.left);    </script>  </body>
</html>

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