[ka-Map-users] Re: Code to indicate tiles have finished loading?

[Daniel Morissette]

Also note that if the user's browser cache is not large enough, then the 
tiles may not all fit in the cache and any potential benefit would be 
lost. I don't see this as being generally useful in real life apps either.

Daniel


Paul Spencer wrote:
> not currently.  Note that for a given map and extents, this could be  a 
> large amount of data ... many MB for sure, probably GB in useful  apps I 
> would think.  But if you wanted to do this, you would probably  write a 
> custom function in your app that would monitor the tile loads  and keep 
> moving to new extents until all the tiles are fetched.  I  don't really 
> see this as a general feature that I would want in cvs  unless everyone 
> thinks its a good idea.
> 
> Cheers
> 
> Paul
> 
> On 6-Oct-05, at 5:06 PM, Ken Sanderson wrote:
> 
>> Sorta related to this question, is there a way to allow the user to  
>> force download all the tiles of the max extent at every scale  level? 
>> Thinking of some of our users that are on super slow dialup,  they 
>> would be willing to download while they east supper with the  
>> assumption it would be faster after that.
>>
>> Ken
>>
>> Paul Spencer wrote:
>>
>>> Peter,
>>> there could be :)  The way things are working right now (iirc) is   
>>> that each image on each layer has its src changed when something   
>>> happens like a pan or a zoom.  This *could* be tracked in kaMap  by  
>>> incrementing a variable that indicates the number of tiles  left to  
>>> load.  Each image has an onload event that is triggered  to make the  
>>> image visible (it is set to not visible when the src  is changed)  
>>> which could also decrement the tile count.
>>> We could add a new event to indicate the that load status has  
>>> changed  but this may involve some thrashing if the images load  
>>> quickly before  the loop to set the src has finished (I don't even  
>>> know if this is a  possible scenario).
>>> Another way would be to have your app set a timer to check the  load  
>>> status every 100ms or so and see if the load count has hit  zero ...
>>> If you come up with a good way in your app, share it with me and  
>>> I'll  put it in cvs as I think this is a generally useful function.
>>> Cheers
>>> Paul
>>> On 6-Oct-05, at 4:22 PM, Peter Giencke wrote:
>>>
>>>> Paul et al,
>>>>
>>>> Is there a lightweight way to determine when ka-map has finished   
>>>> loading all
>>>> layers for a particular view? I'm utilizing some WMS layers for one
>>>> particular ka-map instance, and would like to indicate (with an   
>>>> icon or
>>>> something) that the mapplication is actually doing something  while  
>>>> it's
>>>> fetching/creating the tiles.
>>>>
>>>> -pete
>>>>
>>>>
>>>>
>>> +-----------------------------------------------------------------+
>>> |Paul Spencer                           pspencer at dmsolutions.ca   |
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>>> |Applications & Software Development                              |
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> 
> +-----------------------------------------------------------------+
> |Paul Spencer                           pspencer at dmsolutions.ca   |
> +-----------------------------------------------------------------+
> |Applications & Software Development                              |
> |DM Solutions Group Inc                 http://www.dmsolutions.ca/|
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