Custom Filtering Widget Example

This repo shows how to use the hooks provided by WP Google Maps to add your own filtering widgets.

Please note the distinction between a "filter" (logic) and a "filtering widget" (UI).

Define your widget

1. Define a class extending \WPGMZA\CustomFieldFilterWidget see here
2. Add a filter on wpgmza_get_custom_field_filter_widget, returning an instance of your widget when the input $filter requests it by filter type.
3. Add a filter on wpgmza_custom_fields_widget_type_options, returning an <option> element. This will allow the user to select your widget from the widget type dropdown.

Define the filtering logic

1. Define a class extending \WPGMZA\CustomFieldFilter see here
2. Override the getFilteringSQL method in this class. It receives the $value passed from the user, and should return a statement prepared by $wpdb->prepare.
3. Add a filter on wpgmza_get_custom_field_filter, returning an instance of this class when the input $filter requests it by filter type.