advanced code snippet search

We Recommend

Pro JavaScript Techniques Pro JavaScript Techniques
Pro JavaScript Techniques is the ultimate JavaScript book for the modern web developer. It provides everything you need to know about modern JavaScript, and shows what JavaScript can do for your web sites. This book doesn't waste any time looking at things you already know, like basic syntax and structures.

Posted By

Leech on 07/21/06


Tagged

object test hit


Versions (?)


Who likes this?

3 people have marked this snippet as a favorite

hides
jkochis
shachi


Hit Test v1.0

Published in: JavaScript 

URL: http://jsfromhell.com/geral/hittest

Checks if an object or more partially superposes the area of another. Created: 2005.11.24

Plain TextExpand 
  1. /**************************************
  2. * Jonas Raoni Soares Silva
  3. * http://www.joninhas.ath.cx
  4. **************************************/
  5.  
  6. hitTest = function(o, l){
  7.     function getOffset(o){
  8.         for(var r = {l: o.offsetLeft, t: o.offsetTop, r: o.offsetWidth, b: o.offsetHeight};
  9.             o = o.offsetParent; r.l += o.offsetLeft, r.t += o.offsetTop);
  10.         return r.r += r.l, r.b += r.t, r;
  11.     }
  12.     for(var b, s, r = [], a = getOffset(o), j = isNaN(l.length), i = (j ? l = [l] : l).length; i;
  13.         b = getOffset(l[--i]), (a.l == b.l || (a.l > b.l ? a.l <= b.r : b.l <= a.r))
  14.         && (a.t == b.t || (a.t > b.t ? a.t <= b.b : b.t <= a.b)) && (r[r.length] = l[i]));
  15.     return j ? !!r.length : r;
  16. };

Report this snippet 

You need to login to post a comment.