[OpenLayers-Users] Anchor popup on mouse click location?

[Alexander Petkov]

I'd follow this example to get map coordinates from a mouse click on the map:
http://openlayers.org/dev/examples/click.html

Then, you can do

            popupFeature = new OpenLayers.Feature(someLayer, latlon);
            popupFeature.popupClass = OpenLayers.Popup.FramedCloud;
            popupFeature.data.popupContentHTML= "some html here";

            cloudPopup = popupFeature.createPopup(true);
            map.addPopup(cloudPopup);
            cloudPopup.show();


Hope this helps,

Alex

On Fri, Feb 11, 2011 at 12:41 PM, jfranklin <jfranklin at hmgeo.com> wrote:
> I currently have a vector layer (polylines via WFS/geoserver),
> representing trails for a map I'm currently working on.
>
> I'm using popups to display feature information.  That part is working
> fine, and I can have various attributes about the trail in question
> displayed in the popup correctly.
>
> However, the anchoring seems wiggy.  It seems that the popup is
> anchoring to the center of the polyline feature.  That's fine for short
> lines, but with long ones weird results occur, such as the map extremely
> far away from the current view.
>
> So is there any way to anchor the popup to the location where the mouse
> was clicked?  Code in question is below...
>
> // trails vector layer
>    var trails = new OpenLayers.Layer.Vector("Trails", {
>        styleMap: style_trail,
>        projection: new OpenLayers.Projection("EPSG:4326"),
>        strategies: [new OpenLayers.Strategy.BBOX()],
>        protocol: new OpenLayers.Protocol.WFS({
>            url: "http://example.com:8080/geoserver/wfs",
>                srsName: "EPSG:4326",
>            featureType: "psicc_nfs_trails",
>            extractAttributes:true,
>            featureNS: "pb_trails"
>        })
>    });
>
> //popup code
>          var selectControl = new
> OpenLayers.Control.SelectFeature(trails,{onSelect: onFeatureSelect,
> onUnselect: onFeatureUnselect});
>            map.addControl(selectControl);
>            selectControl.activate();
>            function onPopupClose(evt) {
>                 selectControl.unselect(selectedFeature);
>             }
>
>         function onFeatureSelect(feature) {
>             selectedFeature = feature;
>             popup = new OpenLayers.Popup.FramedCloud("trailinfo",
>
> feature.geometry.getBounds().getCenterLonLat(),
>                                      new OpenLayers.Size(100,200),
>                      "Trail Name:  " + feature.attributes.name, null,
> true, onPopupClose);
>             feature.popup = popup;
>             map.addPopup(popup);
>         }
>         function onFeatureUnselect(feature) {
>             map.removePopup(feature.popup);
>             feature.popup.destroy();
>             feature.popup = null;
>         }
>
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