[OpenLayers-Users] wms untiled 'busy loading' message or image

[Christopher Schmidt]

On Thu, May 03, 2007 at 01:40:12PM +0200, Richard Duivenvoorde wrote:
> Hi List,
> 
> What is the preferred way to implement some kind of 'loading or busy 
> message' for a slow wms server?
> 
> I've got a map with some (faster) tiled reference layers, and one (slow) 
> untiled wms top layer. While the reference layer loads pretty fast, the 
> (dynamic) top layer is sometimes loaded after a few seconds. I want to 
> inform users that they have to be patient for a while :-)
> 
> If there is some kind of callback mechanisme possible which is called 
> when the image is loaded? So I can show an image while loading, and 
> remove it when this callback function is called.

There are 'loadstart' and 'loadend' events on the layer. Those are
probably the best thing to work with. 

Regards,
-- 
Christopher Schmidt
MetaCarta