How to name functions in OpenLayers?

Question

I don't know well enough OpenLayers syntax, so I need to ask here. I need to name every function in OpenLayers (for creating map - tiles, for drawing markers on the map etc.). So, I have this simple code:

map = new OpenLayers.Map('map');
var wms = new OpenLayers.Layer.WMS( "OpenLayers WMS",
"http://vmap0.tiles.osgeo.org/wms/vmap0?", {layers: 'basic'});

I would need to put that inside the function and name that function, something like this:

function createMap() {
    map = new OpenLayers.Map('map');
    var wms = new OpenLayers.Layer.WMS( "OpenLayers WMS",
    "http://vmap0.tiles.osgeo.org/wms/vmap0?", {layers: 'basic'});
               }

createMap();

But that code doesn't work. So, can you tell me if this is possible and why my code doesn't work?

Thanks.

Answer 1

It's always necessary to specify, what "doesn't work" - does it give any error message, etc.

In your createMap() code, you create local variable wms and you don't do anything with it. Probably you want to add it to map:

var map;

function createMap() {
    // map goes into global variable
    map = new OpenLayers.Map('map');

    // wms is local variable, won't be available later
    var wms = new OpenLayers.Layer.WMS(
        "OpenLayers WMS",
        "http://vmap0.tiles.osgeo.org/wms/vmap0?", {
            layers: 'basic'
    });

    // Add layer to map
    map.addLayers([wms]);
}