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Mouse position relative to document and element
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| // Which HTML element is the target of the event | |
| function mouseTarget(e) { | |
| var targ; | |
| if (!e) var e = window.event; | |
| if (e.target) targ = e.target; | |
| else if (e.srcElement) targ = e.srcElement; | |
| if (targ.nodeType == 3) // defeat Safari bug | |
| targ = targ.parentNode; | |
| return targ; | |
| } | |
| // Mouse position relative to the document | |
| // From http://www.quirksmode.org/js/events_properties.html | |
| function mousePositionDocument(e) { | |
| var posx = 0; | |
| var posy = 0; | |
| if (!e) { | |
| var e = window.event; | |
| } | |
| if (e.pageX || e.pageY) { | |
| posx = e.pageX; | |
| posy = e.pageY; | |
| } | |
| else if (e.clientX || e.clientY) { | |
| posx = e.clientX + document.body.scrollLeft + document.documentElement.scrollLeft; | |
| posy = e.clientY + document.body.scrollTop + document.documentElement.scrollTop; | |
| } | |
| return { | |
| x : posx, | |
| y : posy | |
| }; | |
| } | |
| // Find out where an element is on the page | |
| // From http://www.quirksmode.org/js/findpos.html | |
| function findPos(obj) { | |
| var curleft = curtop = 0; | |
| if (obj.offsetParent) { | |
| do { | |
| curleft += obj.offsetLeft; | |
| curtop += obj.offsetTop; | |
| } while (obj = obj.offsetParent); | |
| } | |
| return { | |
| left : curleft, | |
| top : curtop | |
| }; | |
| } | |
| // Mouse position relative to the element | |
| // not working on IE7 and below | |
| function mousePositionElement(e) { | |
| var mousePosDoc = mousePositionDocument(e); | |
| var target = mouseTarget(e); | |
| var targetPos = findPos(target); | |
| var posx = mousePosDoc.x - targetPos.left; | |
| var posy = mousePosDoc.y - targetPos.top; | |
| return { | |
| x : posx, | |
| y : posy | |
| }; | |
| } |
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nice work, except that
var curleft = curtop = 0;actually makes curtop a global variable, so it's better to writevar curleft, curtop = curleft = 0;