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PresideCMS Extension: Map picker

v1.0.4 Public

Map Picker for Preside


What it does

This extension provides an admin map picker for selecting latitude/longitude values via a drag and drop map panel, and gives two-way interaction between the map and the lat/long fields.

It uses Leaflet as its mapping API, and requires an access token from Mapbox.

It also includes UK postcode lookups via, either from a postcode field elsewhere in the form, or by manually entering a postcode to centre the map to.

What it doesn't do

It is not designed as a front-end mapping extension for Preside. Any requirements are usually custom to the application, and so it's nearly impossible to create a one-size-fits-all solution for that.



First, you will want to set up the extension via the Leaflet panel under Preside's System > Settings.

Once you have entered a Mapbox access token, you can set the default centre point and zoom level for new map controls.

The form control

Include the mapPicker form control in your form definition using a named form field (the map picker will not itself relate to any object binding):

<?xml version="1.0" encoding="UTF-8"?>
<form i18nBaseUri="preside-objects.organisation:">
	<tab id="main">
			<field binding="organisation.address" />
			<field binding="organisation.postcode" />
			<field name="locationPicker" control="mapPicker" label="Locate on map"
				latitudeField="latitude" longitudeField="longitude" postcodeField="postcode" />
			<field binding="organisation.latitude" />
			<field binding="organisation.longitude" />

The required attributes for the form control are:

  • latitudeField: the name of the form field that stores the latitude
  • longitudeField: the name of the form field that stores the longitude

Above, we are also using the optional postcodeField. If this is specified, the map picker will show a Set marker at postcode button, which will look up the location of the postcode in this field and centre the map at those coordinates.

There is also an optional zoomField attribute; this field will be linked to the zoom level of the map, so you can store that alongside the coordinates in your data model.

There is a button on the map picker Place marker at map centre, which does what it says: when clicked, it will move the marker to the centre of the current map view.

Finally, Reset marker will restore the map and its linked fields to the state they had when the page was loaded - either the original position of the marker, or removing the marker if there wasn't one.

Dependencies (0)

Dev Dependencies (0)



  • Move text labels to i18n
  • Add warning message if no access token has been set


  • Don't round the default lat/long to integers!


  • Handle empty default lat/long settings


  • Remove custom settings, add postGetBaseMapData interceptor
  • Handle empty default Zoom value
  • Fix typo in box.json


  • Initial public release


$ box install preside-ext-map-picker

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