WFS Data Collection – How to Collect Data via WFS and Popup

editingfields-attributesopenlayers-2popup

I have a map with a WFS-Layer and I am able to add Polygons to my data stored in a PostGIS-database, served with GeoServer (OpenLayers, GeoServer 2.1.4, PostGIS 2.0 for PostgreSQL 9.1).)

How can I add a description to the polygon? E.g., after drawing a polygon I want to specify the crop that are grown there, i.e. insert information into the Postgis-table-column "crop".

I found this example:

http://gis.ibbeck.de/ginfo/apps/OLExamples/OL26/examples/styles_unique_with_group_wfs.html.

The Popup type "edit name and description" would be perfect for my means, unfortunately I can't work out how it works as I have a really hard time understanding its code, greenhorn that I am…

  • How is it done?
  • Or is there an easier example/ way of how to use a popup to edit your attributes?

Here's my WFS-Layer and the tools used so far. The desired column to edit/add Information in the postgis-table "test" is "crop".

function init() {
Save-strategy
var saveStrategy = new OpenLayers.Strategy.Save();

//empty map, bounds are test-layer bounds (EPSG:32647)  
map = new OpenLayers.Map({
    div: "map",
    allOverlays: true,
    maxExtent: new OpenLayers.Bounds(
    653237.69439077,1519879.063165,655229.57939001,1520825.6733868
    )
    });

//WFS-Layer Test= editable data
var test = new OpenLayers.Layer.Vector("Editable Features", {
    strategies: [new OpenLayers.Strategy.Fixed(), saveStrategy],    
    protocol: new OpenLayers.Protocol.WFS({
    url: "http://..../wfs",
    featurePrefix: 'testkf',
    featureNS: "http://.../testkf",
    extractAttributes: true,
    featureType: "test",
    geometryName: "geom",
    })
});

map.addLayer(test);

//Toolbar:
    var panel = new OpenLayers.Control.Panel(
    {'displayClass': 'customEditingToolbar'}
    );

    var draw = new OpenLayers.Control.DrawFeature(
    test, OpenLayers.Handler.Polygon,
    {
    title: "Draw Feature",
    displayClass: "olControlDrawFeaturePolygon",
    multi: true
    });

    var save = new OpenLayers.Control.Button({
    title: "Save Changes",
    trigger: function() {
    if(edit.feature) {
    edit.selectControl.unselectAll();
    }
    saveStrategy.save();
    },
    displayClass: "olControlSaveFeatures"
    });


panel.addControls([save, draw]);
map.addControl(panel);  
map.addControl(new OpenLayers.Control.LayerSwitcher());
map.zoomToMaxExtent();
}

EDIT:

So nobody knows anything about this topic or is there another problem with my question? I found another example, however, this is way too complex for me to understand yet: http://dev4.mapgears.com/bdga/bdgaWFS-T.html

This is exactly what I am looking for. Can anyone break it down to me what the steps are to achieve this?

Or is there any way to improve my question?

Best Answer

To all the people who are looking for a way to collect data via Popup as asked in my question, this is how I solved it (same script as in question except the added popup-function and the tool "select"):

function init() {
Save-strategy
var saveStrategy = new OpenLayers.Strategy.Save();

//empty map, bounds are test-layer bounds (EPSG:32647)  
map = new OpenLayers.Map({
    div: "map",
    allOverlays: true,
    maxExtent: new OpenLayers.Bounds(
    653237.69439077,1519879.063165,655229.57939001,1520825.6733868
    )
    });

//WFS-Layer Test= editable data
var test = new OpenLayers.Layer.Vector("Editable Features", {
    strategies: [new OpenLayers.Strategy.Fixed(), saveStrategy],    
    protocol: new OpenLayers.Protocol.WFS({
    url: "http://..../wfs",
    featurePrefix: 'testkf',
    featureNS: "http://.../testkf",
    extractAttributes: true,
    featureType: "test",
    geometryName: "geom",
    })
});

map.addLayer(test);

//add Popup
        var select = new OpenLayers.Control.SelectFeature(test);
            map.addControl(select);
            select.activate();

        function onPopupClose(evt) {
            selectControl.unselect(selectedFeature);
        }

        <!-- crucial part is form within popup. careful with linebreaks-->  
        test.events.on({
            featureselected: function(event) {
                var feature = event.feature;
                feature.popup = new OpenLayers.Popup.FramedCloud
                ("pop",
                feature.geometry.getBounds().getCenterLonLat(),
                null,
                '<form action="http://.../myphp.php" method="post" target="new">'+                  
                '<p><div class="label"> entry by:</div> <input name="entryname" type="text" size="30" maxlength="30"  value="'+feature.attributes.entryname+'" ></p><br>'+
                '<input type="submit" name="schreiben" value="Submit" onClick="window.location.reload()"></form>',
                null,
                true 
                );
             map.addPopup(feature.popup);  
            },

            <!-- destroy popup when feature is no longer selected. Prevents showing 2 Popups at the same time-->
            featureunselected: function(event) {
                var feature = event.feature;
                map.removePopup(feature.popup);
                feature.popup.destroy();
                feature.popup = null;
            }
        });

//Toolbar:
    var panel = new OpenLayers.Control.Panel(
    {'displayClass': 'customEditingToolbar'}
    );

    var select = new OpenLayers.Control.SelectFeature(test, {
    title: "Select Field",
    displayClass: "olControlSelectFeature"
    });

    var draw = new OpenLayers.Control.DrawFeature(
    test, OpenLayers.Handler.Polygon,
    {
    title: "Draw Feature",
    displayClass: "olControlDrawFeaturePolygon",
    multi: true
    });

    var save = new OpenLayers.Control.Button({
    title: "Save Changes",
    trigger: function() {
    if(edit.feature) {
    edit.selectControl.unselectAll();
    }
    saveStrategy.save();
    },
    displayClass: "olControlSaveFeatures"
    });


panel.addControls([save, draw, select]);
map.addControl(panel);  
map.addControl(new OpenLayers.Control.LayerSwitcher());
map.zoomToMaxExtent();
}

For the form within the popup, a separate php-script is needed. Here, the crucial part is:

$res = pg_query ("UPDATE $tabelle SET entryname = '".pg_escape_string ($entryname)."' WHERE gid = '$gid'");

Hope that helps!

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