Thumbnail url for BaseMapLayer by type?

Discussion created by lordcasb on Jun 2, 2011
Latest reply on Jun 20, 2011 by dewright_ca

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When you create a BaseMapLayer using the type argument, e.g.
esri.dijit.BasemapLayer({
type: "OpenStreetMap"
});
there does not seem to be any way to get the thumbnail url for that type.
Is the only choice to hardcode the url? Is there some way to retrieve the appropriate url and use it when creating a basemap from that basemap layer?
This is part of a project to update my widgit of a dijit.layout.ContentPane with an embedded map object and now an embedded gallery. I would like the addBasemap layer function on that widget to be able to accept a basemap layer type as an argument, but it looks a bit dumb when the thumbnail is blank.

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hzhu Jun 2, 2011 1:06 PM
When you create a BaseMapLayer using the type argument, e.g.
esri.dijit.BasemapLayer({
type: "OpenStreetMap"
});
there does not seem to be any way to get the thumbnail url for that type.
Is the only choice to hardcode the url? Is there some way to retrieve the appropriate url and use it when creating a basemap from that basemap layer?
This is part of a project to update my widgit of a dijit.layout.ContentPane with an embedded map object and now an embedded gallery. I would like the addBasemap layer function on that widget to be able to accept a basemap layer type as an argument, but it looks a bit dumb when the thumbnail is blank.

Maybe this is not you are looking for, i think this esri sample might give me some clue: http://help.arcgis.com/EN/webapi/javascript/arcgis/demos/widget/widget_basemapsthumbnail.html
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lordcasb Jun 7, 2011 6:41 AM
That is using the standard basemaps. I'm trying to retrieve a thumbnail when using the layer by type constructor. There is a workaround for this I think, but that requires diving into the private members of the class I think.
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hzhu Jun 7, 2011 11:14 AM
That is using the standard basemaps. I'm trying to retrieve a thumbnail when using the layer by type constructor. There is a workaround for this I think, but that requires diving into the private members of the class I think.

Does this code snippet anwser your question?

dojo.connect(basemapGallery, "onSelectionChange", function() {
            var basemap = basemapGallery.getSelected();
            var basemapLayer = basemap.getLayers();
            alert("basemap thumbnail url: " + basemap.thumbnailUrl);
            alert("basemap url: " + basemapLayer[0].url);
});
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lordcasb Jun 8, 2011 10:42 AM
Nope. The thumbnail Url is blank.
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dewright_ca Jun 20, 2011 5:28 PM

Did you define your thumbnail URL?

var streetBasemap = new esri.dijit.Basemap({
        layers: [streetTemplateLayer],
        title: "Streets",
        thumbnailUrl: resPath + "/images/toolbar/Streets.png"
    });
    basemaps.push(streetBasemap);

So it would know what URL to use?

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