[OpenLayers-Users] Vector layer not displaying after load

[Peter Becker]

Hello all,

I'm trying to use Vector layers based on WFS and I am encountering issues with 
the layers not displaying straight away. To display them properly I need to 
remove them and add them again or call refresh().

Here is what I do:

        var propertyFilter = new OpenLayers.Filter.Comparison({
            type: OpenLayers.Filter.Comparison.EQUAL_TO,
            property: 'year',
            value: 2009
        });
        subregions = new OpenLayers.Layer.Vector("Subregions", {
            strategies: [new OpenLayers.Strategy.BBOX()],
            filter: propertyFilter,
            projection: new OpenLayers.Projection("EPSG:4326"),
            styleMap: subregionStyle,
            protocol: new OpenLayers.Protocol.WFS({
                url:  "<@geoServerUrlTemplate/>/wfs",
                featureType: "subregions_in_time",
                featureNS: "http://health-e-waterways.org"
            })
        });
        // the next bit forces IE8 to show the overlay
        subregions.events.register('loadend',subregions,function(e) {
            map.removeLayer(subregions);
            map.addLayer(subregions);
        });
        map.addLayer(subregions);

Note the event hook, which fixes this layer for IE8 (it worked in Firefox out 
of the box). The same trick does not work if I swap in another layer later. I 
can't get this bit of code to work properly at all:

    function focusOnSubregion(name) {
        current_subregion=name;
        if (current_subregion == 'Northern') {
            map.zoomToExtent(northern_bounds);
        } else if (current_subregion == 'Southern') {
            map.zoomToExtent(southern_bounds);
        } else if (current_subregion == 'Western') {
            map.zoomToExtent(western_bounds);
        } else if (current_subregion == 'Moreton Bay') {
            map.zoomToExtent(moreton_bounds);
        } else {
            map.zoomToExtent(bounds);
        }
        var yearFilter = new OpenLayers.Filter.Comparison({
            type: OpenLayers.Filter.Comparison.EQUAL_TO,
            property: 'year',
            value: 2009
        });
        var subRegionFilter = new OpenLayers.Filter.Comparison({
            type: OpenLayers.Filter.Comparison.EQUAL_TO,
            property: 'subregion',
            value: name
        });
        var propertyFilter = new OpenLayers.Filter.Logical({
            type: OpenLayers.Filter.Logical.AND,
            filters: [yearFilter, subRegionFilter]
        });
        current_areas = new OpenLayers.Layer.Vector("Catchments", {
            strategies: [new OpenLayers.Strategy.BBOX()],
            filter: propertyFilter,
            projection: new OpenLayers.Projection("EPSG:4326"),
            styleMap: catchmentStyle,
            protocol: new OpenLayers.Protocol.WFS({
                url:  "<@geoServerUrlTemplate/>/wfs",
                featureType: "areas_in_time",
                featureNS: "http://health-e-waterways.org"
            })
        });
        map.removeLayer(subregions);
        map.addLayer(current_areas);
    }    

I tried using the "loadend" event again with various things in it, but it 
doesn't work. Turning the layer off/on manually does as does a call to 
refresh() later.

Am I doing something wrong? Is there something I should wait for before adding 
the layer?

Thanks,
   Peter
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