[OpenLayers-Dev] popups and non-base layers not working when re-init'ing map in same div

[crb]

We have a .NET app using OL 2.9.1 and it has a "results" map that is invoked
when the user clicks on a button in a results page. The map is loaded in a
div that's inside a .NET control (the div is pretty much the only thing in
the control). Whenever the user does a search in the app and gets results,
if they invoke the results map then the app first does a callback to get all
the locations in the result set and passes those (in JSON) to the results
map.  The results map then has just three layers (a base streets layer, a
base imagery layer, and a vector layer with the locations) and a select
control for a popup on the vector layer.  It creates a vector layer from the
locations JSON and zooms to the extent that encompasses those locations. 

Everything works fine the first time the user invokes the results map, but
for subsequent invokations only the streets base layer works:  the popup
doesn't work, and the extent for the imagery base layer goes to a default
extent (and not all tiles are rendered).

I've tried deleting the variable that contains the results map as follows:


if (typeof(myResultsMap) != "undefined") {
   delete myResultsMap;
}

myResultsMap = new ResultsMap(initSettings, "MapSearchResultsControl",
mapLocs);

// where initSettings are JSON map setting results from one callback and
mapLocs are location details from another callback, and
MapSearchResultsControl is the div within the .NET control


When I step through the code I clearly see that the myResultsMap variable is
undefined before instantiating a new ResultsMap class, but the behaviour is
no different.  The init for the ResultsMap class looks like this:


ResultsMap = OpenLayers.Class(null,
{
    rm: null,
    map: null,
    mapProjection: null,
    displayProjection: null,
    initSettings: null,
    mapDiv: null,
    mapLocs: null,
    locsLayerName: null,
    locsLayer: null,

    initialize: function (initSettings, mapDiv, mapLocs) {
        rm = this; // needed to workaround fact that 'this' can change scope
within the class because of callback handlers
        rm.mapDiv = mapDiv;
        rm.initSettings = initSettings;
        rm.mapLocs = mapLocs;
        . . .
        var mapOptions = . . .
        . . .
        rm.map = new OpenLayers.Map(rm.mapDiv, mapOptions);
    }
. . .
}


Am I doing something inherently wrong in re-initializing a map within the
same div multiple times?

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