You legend!!!
After about a fortnight worth of posts to various forums
etc. - no-one ever
raised that possibility..
I'd just never considered that MS would incorporate the
co-ords into an
ImageButton, when they haven't put it into ImageMap control
-> where it
would logically be required..
Anyway so much for needing the custom control.. Still
interested in what the
author did to the client-side postback code that made it
incompatible with
other controls, but I guess it can wait now!
Thanks again Peter.
Andrew
_____
From: Peter Brunone [mailto:peter.brunone gmail.com]
Sent: Thursday, 22 June 2006 12:03 PM
To: aspnet-controlbuildingaspadvice.com
Subject: [aspnet-controlbuilding] Re: Click event fails when
page includes
dropdownlist with autopostback enabled
Can't you just use an ImageButton control for this? I
believe the standard
<input type="image"> records coordinates,
and that this is how the
ImageButton renders.
Regards,
Peter
On 6/20/06, Andrew Haslett <bunceinternode.on.net> wrote:
Hi all.
We have a requirement to return the (pixel) coordinates
specifying where a
user has clicked on an image (its an asp.net front-end
hitting a cold-fusion
web-service interacting with a GIS mapping system).
The new ImageMap control in asp.net 2.0 offers a 'Click'
event but due to
the way HTML imagemaps work it can't parse the co-ordinates
that are
returned in the querystring (they are malformed).
So I found a control that a fellow has made which extends
the ImageMap
control making available the coordinates as arguments of the
click-event:
ht
tp://www.codeproject.com/useritems/ImageMap2.asp
<http://www.codeproject.com/useritems/ImageMap2.asp>
Works great, until I place a standard asp.net dropdown list
on the same page
and set its auto-postback property to true. I'm guessing
the JS injected by
the dropdown list to hook-up the auto-postback event
conflicts with the JS
code written by the custom control to capture the clicked
coordinates and
pass them through to the click-event.
Basically the Click-event of the custom control just
doesn't fire in this
situation. I've stepped through the code and everything
else in the page
lifecycle fires except the click-event.
Anyway, I'm not too gifted with JS so I was wondering if
anyone can spot the
culprit when comparing the output of the two pages... I've
created an
example of a functioning and non-functioning page below:
* Functioning (dropdownlist autopostback enabled):
htt
p://www.thebunse.com/test/clickeventfires.aspx
* Not functioning (dropdownlist autopostback disabled):
htt
p://www.thebunse.com/test/clickeventfails.aspx
The code is identical in both pages except for the
auto-postback property of
the dropdownlist.
Any ideas?
Thanks in advance,
Andrew
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