I've done something similar, here's my code:
map.events.register("zoomend",
map, function(){
var mapZoom =
map.getZoom();
var treeLayers =
Ext.getCmp('lyrsTree');
var nodeLimAdmin
= treeLayers.getNodeById('limitsAdmin');
var
layerLimAdmin = map.getLayersByName("limadmin")[0];
if(mapZoom > 5){
layerLimAdmin.setVisibility(false);
if(Ext.isDefined(nodeLimAdmin))nodeLimAdmin.disable();
}else{
if(Ext.isDefined(nodeLimAdmin))nodeLimAdmin.enable();
}
});
Hope this helps you.
Antoni Vidal
Unitat d'Aplicacions SIG-WEB
Institut Cartogràfic de Catalunya
<http://mercuri.icc.cat/website/mob_nf/mob1/mob2/inici2.htm?CONSULTA=Institut%20Cartogr%25E0fic%20de%20Catalunya&XYADDRESS=429486:4580392>
Parc de Montjuïc, E-08038 Barcelona
Tel. (+34) 93 567 15 00 (ext. 3228)
www.icc.cat <http://www.icc.cat/>
De: users-boun...@geoext.org [mailto:users-boun...@geoext.org] En nom de Robert
Buckley
Enviat: martes, 21 de febrero de 2012 14:51
Per a: users@geoext.org
Tema: [Users] How can I enabe,check node and change the visibility of basemaps
with zoomlevel?
Hi,
I am trying to turn off my basemaps according to the current zoom level....ie
for zoom levels over 6 show,enable and check "layer_0", otherwise show,enable
and check "layer_1"
<code>
map.events.on({
"zoomend": function (e) {
if (this.getZoom() >6) {
layerTree.getRootNode().findChild('layer', layer_0,
true).disable();
layer_0.setVisibility(false);
layerTree.getRootNode().findChild('layer', layer_0 ,
true).checked==false;
} else {
layerTree.getRootNode().findChild('layer', layer_1,
true).disable();
layer_1.setVisibility(true);
layerTree.getRootNode().findChild('layer', layer_1 ,
true).checked==true;
}
}
});
The problems are as follows...
1. The nodes do not "check"
2. The disable method works ok, but when I zoom out again the layer still
remains visible but does not zoom?!?
Has anyone done this successfully and can show me how?
yours,
Rob
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