jquery coordinates of element from bottom right

I want to create a script where the user can drag a dot on a grid (starting at bottom left).
I have started by using jQuery UI draggable and can access the coordinates from top left...

See below:

<script>


$(document).ready(function() {

$('#dragThis').draggable(
    {    containment: "#grid", scroll: false,

        drag: function(){
			

            var offset = $(this).offset();
            var xPos = offset.left;
            var yPos = offset.top;
            $('#posX').text('x: ' + xPos);
            $('#posY').text('y: ' + yPos);
			
			

        }
    });
});
	
	
	
</script>

Open in new window


I want to beable to get the coords from bottom left... See example emage below...

grid example
Eventually I want the 2 coords in a form textbox seperated by a comma. This will then be submitted to a database.

Could anyone help?

Steve
Steve TinsleyAsked:
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GaryCommented:
For the measurement from the bottom just take the element.height() and subtract the offset.top
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Steve TinsleyAuthor Commented:
The problem is that I want to cords from the div (which is in the middle of the browser), not the cords from the edge of the screen.
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reitersCommented:
I'll just lob this one out here.  Not sure if it's a shorter/easier solution.

<input type="image" name="blah" id="blah" onclick="javascript: void(0);" src="..." />

Let the input tell you where on the image the user click.  You can then use jQ to do all the other stuff.

$("#blah").click(function(){
     foo = $("#blah").val();
     // create a dot and put it in the right place using jQ and the x/y from "foo"
});

That is an untested theory above but wouldn't take long to test it.

To make the dot I would have 2 divs.  One inside the other with the outer on position:realative and the inner one position:absolute (hidden,top=-10,left=-10) and when clicked I would relocate the inner div to the right x/y and unhide it.
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GaryCommented:
jQuery height works with whatever element you want, not just the screen
You are already getting the top position, so you just need to get the element height and subtract
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Steve TinsleyAuthor Commented:
Easier that I thought.
I just used the math.abs JavaScript command to get the positive then.
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