[OpenLayers-Users] Alternatives to get rid of WFS layers

[Roel De Nijs]

After some experimenting I'm convinced the GetFeature control is definitely the best choice for the (our) job. Thanks for all the suggestions, they have put us definitely on the right track!

Now I just have 1 small question left. The layers the GetFeature control must query can be different with each and every request (because of zoom level & user can select/unselect layers as well), so I had to define my own protocol. What I have implemented really works great, but I was wondering if this is really how you are supposed to use the OpenLayers API. Would be great to get some feedback about my custom control.

var control = new OpenLayers.Control.GetFeature({
        click : true,
        clickTolerance : 10,
        protocol : new OpenLayers.Protocol.HTTP({
                format : new OpenLayers.Format.GeoJSON(),
                url : URL,
                read : function(options) {
                        options = options || {};
                        options.callback = function(result) {
                                if (result.success()) {
                                        // process features
                                }
                                // reset the cursor
                                OpenLayers.Element.removeClass(this.map.viewPortDiv, "olCursorWait");
                        };
                        options.params = OpenLayers.Util.applyDefaults(options.params, {
                                layers : getDataLayerNames(),
                                request : "GetFeature"
                        });
                        OpenLayers.Protocol.HTTP.prototype.read.apply(this, arguments);
                }
        })
})

Kind regards,
Roel

________________________________________
Van: openlayers-users-bounces at lists.osgeo.org [openlayers-users-bounces at lists.osgeo.org] namens Phil Scadden [p.scadden at gns.cri.nz]
Verzonden: zondag 18 januari 2015 21:11
Aan: openlayers-users at lists.osgeo.org
Onderwerp: Re: [OpenLayers-Users] Alternatives to get rid of WFS layers

 >Currently I use a GetFeature control with a custom defined protocol to
execute the WFS request and process the results. Is this the best
 >control for this scenario? Or would a SelectFeature control (or
another one) be more suitable for this job?

My code for doing this is quite old and definitely work in the "if ain't
broke, dont fix it" mode. I use a custom wfs protocol tied to
"featureadded" of a point Drawfeature control. I think at the time, it
was a way to give more control over the radius of selection. Since I
used near identifical code for "select by polygon" (use a polygon
handler instead of point handler in the draw control) it may simply have
been economy of effort. I have only used selectFeature control with
vector layers (kml) but I struggle to remember the decision-making
process around that.

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