[OpenLayers-Users] Trigger a function before every zoom

Sun Apr 22 16:18:22 EDT 2012

Hi everyone,

I am trying to animate the growth of some divs which I have positioned
according to lon lat values on the map (like markers but more complex and
more flexible for css manipulation). I want them to grow as a user zooms.

I want to animate them using css transitions but these transitions should
not be applied on panning or dragging. I am therefore injecting the
transition styles into the <head> before changing the size of my divs and
then removing them again after. This works and performs well. The problem
is that I am using the 'zoomend' event and this causes the animation to
start AFTER the map (and all the 'marker' elements) have already moved. For
the effect I want to achieve I need to be able to activate the transitions
before the map moves so that the elements move smoothly appart.

*So.... Why is there not a 'zoomstart' event? And seeing as there is no
event triggered ONLY for the start of a zoom (movestart is triggered for
pan and drag too) can you think of any way to trigger a function at this
time?*

Any help would be really appreciated :)

-- 
Dean Fischer

Co-founder at Maptia <http://www.maptia.com>

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