Bugs item #762495, was opened at 2003-06-28 22:31
Message generated for change (Comment added) made by bs_php
You can respond by visiting:
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Category: DynAPI 3 API
Group: Unverified
Status: Open
Resolution: None
Priority: 5
Submitted By: Sam Blum (bs_php)
Assigned to: Nobody/Anonymous (nobody)
Summary: Wrong position retured when page has been scrolled down.
Initial Comment:
Reproduced the bug in IE and Mozilla 1.3
To see the effect, open the dynapi example:
examples/dynapi.api.mouseevent.html
- You should see some colored layers that are cascaded
in each
other in the middle of the page.
- On the left we have some links to turn mouse-events
on and off.
- The debugger window should open as well.
The page contains so much info, that a standard scroll-
bar should appear on the right of the browser. If not
make the browser window less high.
Now do as follows:
A) Turn on the click/dblclick events for the blue layer.
This is done by clicking on the
"Listen to click/dblclick events -> blue -> on"
link (see the page)
B) Then click on the blue layer top left corner and look
at the output on the debugger window. It should say
something like this:
"click blue xy=0,0 pXY=300,200 origin=blue"
NOTE:
xy are the coordinates of the click on the blue layer
relative to it's own top left corner. pXY are the
absolute coordinates relative to the view (top left
corner of the browser).
C) Now scroll down a little and click again on the blue
layer (try to hit the same spot). Now in the debugger
window look at the result:
"click blue xy=0,-148 pXY=300,52 origin=blue"
BUG:
Compare the xy result 0,0 and 0,-148. I would have
expected to get the same result in case A) and B)
for xy (the pXY results are OK). But the y axis has
a negative number, caused by the scrolling.
Side Effect Bug:
Next I modified the code and set the red layer
to 'relative'
Thus, I added line: red.setPosition('relative');
This will position the layers at the bottom of the
page. Again try to repeat B) and C) (as good as you
can)
and compare the results:
"click blue xy=8,496 pXY=308,696 origin=blue"
"click blue xy=8,396 pXY=308,596 origin=blue"
The effect is the same AND a *side effect* shows up:
alway have an x offset of 8px (13px on IE). But I heard
that reletive posistioning is problematic.
-- bs_php
----------------------------------------------------------------------
>Comment By: Sam Blum (bs_php)
Date: 2003-06-29 01:18
Message:
Logged In: YES
user_id=308859
This would my suggestion for mouse_dom.js
p.getScrollX = function() {return
document.body.scrollTop||0};
p.getScrollY = function() {return
document.body.scrollLeft||0};
p.getX=function() {return (this.x||0) + this.getScrollX()};
p.getY=function() {return (this.y||0) + this.getScrollY()};
This would my suggestion for mouse_ie.js
p.getScrollX = function() {return window.pageXOffset||0};
p.getScrollY = function() {return window.pageYOffset||0};
p.getX=function() {return (this.x||0) + this.getScrollX()};
p.getY=function() {return (this.y||0) + this.getScrollY()};
----------------------------------------------------------------------
Comment By: Sam Blum (bs_php)
Date: 2003-06-29 00:47
Message:
Logged In: YES
user_id=308859
OK here is the solution ( I know it' currently a hack)
=================================
For Mozzila 1.3 in mouse_dom.js replace the lines:
p.getX = function() {return this.x};
p.getY = function() {return this.y};
with
p.getX_ = function() {
var _x = this.x||0;
var _xOffset = 0;
if (this.ns) {
_xOffset = document.body.scrollTop||0;
}else{
_xOffset = window.pageXOffset||0;
}
return _x + _xOffset;
};
p.getY_ = function() {
var _y = this.y||0;
var _yOffset = 0;
if (this.ns) {
_yOffset = document.body.scrollLeft||0;
}else{
_yOffset = window.pageYOffset||0;
}
return _y + _yOffset;
};
NOTE: I've seen in the code that this.x and this.y are refered
often directly (not using the getX()-methode) so there may
more to correct then just the methods
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