README.md

Show some statistics on the selected features for some fields

The script will show a small window on the right side of the map with computed statistics on the current layers selected features.

You should add both the CSS file show_statistics_on_selection.css and the JS file show_statistics_on_selection.js in your media/js/project_name folder, as described in Lizmap Web Client documentation

You can configure the layers, fields and aggregate functions by updating the statistics_config variable.

    // Aggregate functions can be:
    // count, sum, average, minimum, maximum
    var statistics_config = {
        'layers': {
            'Parcelles': {
                fields: {
                    'geo_parcelle': ['count'],
                    'surface_geo': ['sum', 'minimum', 'maximum']
                }
            },
            'Sections': {
                fields: {
                    'geo_section': ['count'],
                    'ogc_fid': ['minimum', 'maximum']
                }
            }
        }
    };

The layers keys can contains one or several layers objects.

• For each layer, you should add a new key with its name (as written in QGIS layers panel), for example Parcelles.
• This key contains an object with a fields key listing the fields for which to calculate the stats.
• For each field, you can have an array of one or several aggregate functions, among count, sum, average, minimum, maximum

In the example above, the statistics window shows:

• the number of the geo_parcelle field, which is the primary key of the table: this will show the number of selected features
• the sum of the parcels area taken from the field surface_geo, and the minimum and maximum area.

and the statistics for the other Sections layer: number of selected features (count of geo_section), and minimum/maximum of the ogc_fid field

You can also adapt the locales for the aggregated functions labels. At present, only one translation is possible:

    var aggregate_function_locales = {
        'count': 'Count',
        'sum': 'Sum',
        'average': 'Average',
        'minimum': 'Minimum',
        'maximum': 'Maximum'
    }