Filter
Filter the map’s vector layers (GeoJSON files included) by their attributes. You author preset filters (a layer plus one or more attribute conditions) that end-users toggle on the map, and you decide whether they may also build their own filters, on the layers and fields you allow.
A filter keeps the features whose attribute is one of the chosen values; several conditions combine (a feature must match all of them). Filters change what the map shows; the data itself is never modified.
Parameters
Section titled “Parameters”| Parameter | What it does |
|---|---|
| Preset filters | Named filters published with the map. Pick a layer, an attribute, then the values to keep, read straight from the layer’s data. Active by default applies a preset when the map loads (end-users can still turn it off). |
| End-users can build filters | Adds a small builder to the widget: end-users pick a layer, an attribute and the values to keep. Their filters stay local to their session; your presets never change. |
| Layers they may filter | The layers offered to the builder. None checked = every vector layer of the map. |
| Foldable button / Open by default | A button that unfolds the filter list, or an always-open panel (best in a sidebar). |
| Position | The map corner the widget lives in. The panel always unfolds toward the inside of the map. |
What end-users see
Section titled “What end-users see”A funnel button in the corner you picked, with a badge counting the active filters. It opens the list of your presets as switches; turning one on filters its layer immediately. If you allowed it, an Add a filter section lets them compose their own condition (layer, attribute, values), applied for the duration of their session and removable with one click.