[OpenLayers-Users] Update Markers

[Dara Dowd]

Christopher Schmidt-4 wrote:
> 
> On Wed, Aug 29, 2007 at 05:48:58PM -0700, Wagner, Jeffrey S. (Mission
> Systems) wrote:
>> 
>> I'm utilizing ActiveMQ to push objects onto a map.  As messages are
>> received a "database" on the client side is built to determine if this
>> is a new object, or just an update to an existing object.  Currently,
>> I'm removing the existing marker and then adding a new marker for an
>> updated.  This seems pretty in-efficient.  Any ideas?
> 
> There is no 'supported' way of doing this, but marker.icon.imageDiv is
> the actual container for the image. (This probably is a div, with an img
> as its firstChild.) Using this and just changing
> marker.icon.imageDiv.firstChild.src will probably work, but it is
> possible (though at this point, seems relatively unlikely) that the name 
> 'imageDiv' will change in the future, so you should be prepared to check
> your code against a new release before switching over.
> 
> 

I found that 

markers[this.currentlyHighlighted[i]].icon.imageDiv.firstChild.src =
this.default_marker_src

doesn't work for me in IE6

but 

OpenLayers.Util.modifyAlphaImageDiv(markers[this.currentlyHighlighted[i]].icon.imageDiv,null,null,null,this.default_marker_src);

does.
			
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