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In the IOOS prototype http://www.mapsherpa.com/ioos/ a query can be resubmitted when it is not requested. Here are the steps to reproduce: - launch application (http://www.mapsherpa.com/ioos/) - do a point query - close the query results window - change the month in the Time Filter - the query will be resubmitted
This may only be a problem in IE. I tested it in IE 6 and reproduced it fairly reliably although sometimes it doesn't occur. argh. In Netscape 7.1 I could not reproduce it.
I was able to reproduce it in Firebird (which is Mozilla, which is Netscape 7.x) by following Dean's steps outlined above on my first try, darn! Investigating now ...
This is an interesting bug. Basically, it has to do with something called 'event bubbling' in javascript (which is handled differently by all browsers). You should get the same effect if you select the zoom in tool, then change the time (without zooming in), you will zoom in. The dropdown combo for the time widget appears over the map, when you click on an entry, a mouse click event is generated that is handled by various event handlers. In some browsers, if a custom onclick event handler is provided, then the default behaviour is to pass the event to other objects in the page that contain the mouse unless one of the event handlers explicitly cancels it. In the case of chameleon, the main mouse event handlers related to the map are actually registered at the document level, which means that any event that occurs will eventually bubble to these functions unless canceled - hence if you click on a select item that overlaps the map, and the event handler doesn't cancel it, it will appear to chameleon as if the user clicked on the map. The same effect happens with the scrollbar in some browsers. If a navigation tool (or query) is selected, and either scrollbar is over the map and the user scrolls the scrollbar, then the mouse click ends up in the chameleon event handler even though it shouldn't. There is no known work-around for this problem. However, in the case of the time widget, I think that we can add code to the onclick event handler to prevent the onclick event from being propogated to other objects in the page. Reassigning to Bill since he worked on this widget. Bill, discuss with me when you get to this one.
Once we figure out how to handle this, it needs to be documented as standard procedure for widget developers to include cancelling event bubbling in any javascript event handlers ... and should go into our QA process somewhere to validate this somehow ... probably through manual code reviews would be the only way.
It looks like this happens when a drop down list goes over the map image and the user selects an item that overlaps the map. It seems that this bug never happens when a choice is made that does not overlap the map, and that it *sometimes* happens when the choice overlaps the map. For example, if you choose December it might happen because December is at the bottom of the list, which overlaps the map. If you choose January you should never get the problem.
appears to be IE only now.
Tip: I've already seen that problem before. Not sure if it's related, but when a CWC2 template have widgets building some JS code referencing to empty images (eg: myimg.src = "";) the "browser" was trying to load the empty image anyway. Some browser was adding the full current path to the empty image that caused the reload of the template (not visible becose it's a image).
I remember that it was happenning in js code (assinging images to button). I 've already fixed that in 1.1. Just checking if image url is empty before loading it.
Has there been any progress on this bug? I hate to be a nag but this bug presents a major usability issue in the IOOS demo application and really should be fixed. It may also affect any number of other CWC2 applications out there.
Thanks for the tip Sacha, I will look into that specifically. I did spend a bit of time checking the event idea, I don't think that is the problem in this case (although in general, it is a problem). Next direction is Sacha's hint I think. can this be coded to IOOS?
this is a very odd bug because it does seem to come from the onclick event but it doesn't seem possible to prevent the event bubbling from happening using the published way of doing it. There doesn't seem to be a problem with empty images. So I fixed this by detecting the target of the event in the query handling javascript, and if the target is not the map then the query widget ignores it. fixed in chameleon 1.0.6 available from: http://www.maptools.org/dl/chameleon/chameleon-1.0.6-20031222.tar.gz http://www.maptools.org/dl/chameleon/chameleon-1.0.6-20031222.zip
