regards,
stoimen

Thanks a lot for your fast response! I’ll try it!

Other than the zoom in/out issue, i did registered a mouseover event of a popup for every marker. Without implementing the marker layer, is there anyways to register the mouseover event for the markers ?

Best Regards,
ilotus

I actually noticed that all the chain from new OpenLayers.Marker is slow because once you make instance of an Icon class, than pass it as a parameter to the Marker class and than add it for every marker to the Markers Layer.
What I think is that you basically can avoid all this, because the final result of generation of all these DOM elements is slow. Important note is to say that after changing all this process to simple innerHTML string manipulation the zoom in/out will not be as smooth as before.

Now the code may look like something like:

for (var i = 0; i < 300; i++) {
	var thumbnail = new Icon();
	var marker = new Marker(lon,lat,icon);
	map.markerLayer.addMarker(marker);
}

which is slow. What I did is that I noticed all this was producing a simply DOM nodes so I switched to string concatenation.

var emptyString = '';
for (var i = 0; i < 300; i++) {
	// here i need to convert Lon Lat to pixels this is done by OpenLayers
	ll = map.getLayerPxFromLonLat(new OpenLayers.LonLat(lon,lat));	
	
	// than simply concatenate the markup to the emptyString
	emptyString +='
';
}

// after the loop has finished.. append all this to the dom via innerHTML, which is way faster than appendChild
markersDiv.innerHTML = emptyString;

You'll see this is very very fast comparing to the OpenLayers method.

If you've any questions don't hesitate to ask. I'll be very glad to help you!

regards,
stoimen

Your idea is cool! I’m been tried to resolve this headache, I’m not a good grasp of your idea “generated all the markers as markup with innerHTML”. In convention, the markers are added to the marker layer..so how to position the markers with using innerHtml ?

Thanks in advance!

nice post again, even i don’t get what’s openlayers and what’s used aobut