javascript - document.elementFromPoint returning null on IE -


i using document.elementfrompoint getting selected element dragging it. returns null. when debug same , re run same code, object returned.

following code:

function getzonefrompoint(x, y, prtdrag, elemibeam,evnt) {     if (x == null || y == null || prtdrag == null || elemibeam == null)         alert("null in getzone");     var prtdragzindexold = prtdrag.style.zindex;     var elemibeamzindexold = elemibeam.style.zindex;     prtdrag.style.zindex = -1;     elemibeam.style.zindex = -1;     var zone;     zone = document.elementfrompoint(x, y);     prtdrag.style.zindex = prtdragzindexold;     elemibeam.style.zindex = elemibeamzindexold;     if (zone == null) {         zone = document.elementfrompoint(x, y);         if (zone == null) {             debugger;             zone = event.rangeparent;         }     }     if (zone == null) {         alert('null');         return null;     }     if (x < 0 || x > document.body.clientwidth ||       y < 0 || y > document.body.clientheight) {         zone = null;     }     else if ((zone.classname == 'layoutwellelement') ||            (zone.classname == 'layoutmainelement') ||            (zone.classname == 'elementframe')) {         while ((!fiszone(zone)) && (zone.tagname != 'body')) {             zone = zone.parentelement;         }     }     if (!fiszone(zone)) {         zone = null;     }     return zone; }

it's have same nasty idea, haha. i'm working on object collision. look, call getzonefrompoint. cursor click event invoked in browser, right? so, no need check x or y, zone=null @ first. double check elementfrompoint while x & y unchanged? i'm done work flow here.

some tips: - have 2 'absolute' div objects called & b b overlap @ bottom right corner. - use this: var x=parseint(b.offsetleft); var y=parseint(b.offsettop); alert(document.elementfrompoint(x,y).innerhtml); - why parse? offsetleft return in format: number+"px" - result is: ie->return while ff->b - if x-1 or y-1, both browsers return a. - final words: don't use document.body.clientwidth alone check resolution, try document.body.clientwidth-o.clientwidth. hope these give power bonus. cheer!


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