Openlayers - Get extent of WFS vector layer and zoom to that extent when map

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I would like to do the following:

1) While loading an OpenLayers map object get the lat/long Bounding Box of a WFS vector layer served from GeoServer.2) Use the extent from the WFS vector layer to zoom so the entire layer is viewable.

This is the script I have now that uses the lat/longs from the WFS vector and then zooms. This script works fine. I have a javascript function where the map and controls are created in the onLoad of the html Body tag. At the end of the script I call the loadZoomTo() function which then calls this line of script;

function zoomOnLoad() { this.map.setCenter(new OpenLayers.Bounds(-79.8961,41.1,-78.80809,42.2).getCenterLonLat(), 10); }In this script I have the lat/longs hard-coded but I need to be able to change these interactively depending on what option the user selects when he enters the application. If I remove the hard-coded lat/longs and try to replace them with something like this:

function zoomOnLoad() {this.map.setCenter(new OpenLayers.Bounds(mLayers[a].getDataExtent()).getCenterLonLat(), 0);}it fails. I have also tried the event handler method as detailed here: OpenLayers, zoom to vector layer extent

but all I get is the html of the page with none of the OpenLayers stuff. No map, no controls etc..

Any suggestions would be appreciated.



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