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I need to modofy attributes of features appeared on a map using OL3. The features live in a postigs db and they are serverd through Geoserver. What I want is to modify some of the non spatial attributes of each feature.

What I did in order to accomplish this is to create a menu in which the user selects the values he wants to modify for a specific feature and then save the changes with a button. On button click I would send an ajax request (jquery/php) in which I would update the table values based on the fid of the table.

If I understand correctly using WFS-T is a more appropriate way. Is that right? Can I change non spatial attribute values with WFS-T? If yes, is there an example using OL3?

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Yes WFS-T is more appropriate and can be used to edit non spatial attributes as well. Look at: http://openlayers.org/en/v3.14.2/apidoc/ol.format.WFS.html#writeTransaction on how to generate the payload.

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