extract the unique node id given the x and y coordinates

Hi,

I need to get the unique node assosicated given 2 sets of x and y coordinates.
I have the start and end coordinates of a selected region. And now I need to get the unique ID associated with both of it.

Please do let me know as soon as possible as to how I can go about doing this.

Thanks..
avz

re: extract the unique node id given the x and y coordinates

You have to give some more detail: how are those x,y,ID triples stored? What is/are stored in those two sets? Just (x,y) coordinates or the Carthesian product of all coordinates? Are you looking for a position on a (geographical) map?

kind regards,

Jos

re: extract the unique node id given the x and y coordinates

Hi Jos,

Thank you for replying.
The x and y coordinates, are the coordinates where the screen starts at (0,0),
So when the mouse clicks to select an area, (assume a square ), then i get the top left x y position and the bottom right x y position.
So now that I have these values, I need to get the unique ID from the DOM tree. I learnt that for each element on the HTML page there is a unique node id associated with it.
So I need to get the unique node ids with the pair of x n y coordinates I have got.
Please do let me know if you need more information.

Thanks,
Avanthi

re: extract the unique node id given the x and y coordinates

For every component in that DOM tree you need to get the (x,y) (w,h) values (the top/left coordinate and width and height) and check whether or not they lie inside the given (x,y) (w, h) values. If the z value of those components is available as well, take the component which is nearest to the top of the z stack.

kind regards,

Jos

re: extract the unique node id given the x and y coordinates

Hi Jos,

Thanks for the reply. Actually that is simliar to the logic I was thinking, but I just needed some code to go about doing this. So is there some code which I could get from anywhere?

re: extract the unique node id given the x and y coordinates

Do you know how to iterate over your components in your DOM? If so you have solved the major part of your problem already.

kind regards,

Jos