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

[Peter Giencke]

Paul et al,

I've finally had some time to start working on this issue. My current course
of action is to keep track of the number of images set/created and compare
that by implementing a counter in imgOnLoad. 

The problem I'm running into is that the number of set/created images is
always lower than the actual number of images calling to the onload
function. Here's what ka_map is reporting for a simple ka_map instance:

Not a_pixel images calling imgOnLoad: 98
a_pixels images calling to imgOnLoad: 210
Total number of calls to imgOnLoad: 308

setTile images set: 224
Created via createTile: 140

Am I missing something, or is there a better way to gauge the total number
of pictures set/created to compare with the imgOnLoad counter...

-pete

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   |
> +-----------------------------------------------------------------+
> |Applications & Software Development                              |
> |DM Solutions Group Inc                 http://www.dmsolutions.ca/|
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