[//]: # (WARNING: this file is automatically generated. Please find the sources at the bottom and edit those sources)



 Special tag renderings 
========================

In a tagrendering, some special values are substituted by an advanced UI-element. This allows advanced features and visualizations to be reused by custom themes or even to query third-party API's.

General usage is `{func_name()}`, `{func_name(arg, someotherarg)}` or `{func_name(args):cssClasses}`. Note that you _do not_ need to use quotes around your arguments, the comma is enough to separate them. This also implies you cannot use a comma in your args

#### Table of contents

    + [Using expanded syntax](#using-expanded-syntax)
1. [default](#default)
  - [delete_button](#delete_button)
    + [Example usage of delete_button](#example-usage-of-delete_button)
  - [if_nothing_known](#if_nothing_known)
    + [Example usage of if_nothing_known](#example-usage-of-if_nothing_known)
  - [minimap](#minimap)
    + [Example usage of minimap](#example-usage-of-minimap)
  - [move_button](#move_button)
    + [Example usage of move_button](#example-usage-of-move_button)
  - [qr_code](#qr_code)
    + [Example usage of qr_code](#example-usage-of-qr_code)
  - [share_link](#share_link)
    + [Example usage of share_link](#example-usage-of-share_link)
  - [split_button](#split_button)
    + [Example usage of split_button](#example-usage-of-split_button)
2. [favourites](#favourites)
  - [favourite_icon](#favourite_icon)
    + [Example usage of favourite_icon](#example-usage-of-favourite_icon)
  - [favourite_status](#favourite_status)
    + [Example usage of favourite_status](#example-usage-of-favourite_status)
3. [images](#images)
  - [image_carousel](#image_carousel)
    + [Example usage of image_carousel](#example-usage-of-image_carousel)
  - [image_upload](#image_upload)
    + [Example usage of image_upload](#example-usage-of-image_upload)
4. [notes](#notes)
  - [add_image_to_note](#add_image_to_note)
    + [Example usage of add_image_to_note](#example-usage-of-add_image_to_note)
  - [open_note](#open_note)
    + [Example usage of open_note](#example-usage-of-open_note)
5. [reviews](#reviews)
  - [create_review](#create_review)
    + [Example usage of create_review](#example-usage-of-create_review)
  - [list_reviews](#list_reviews)
    + [Example usage of list_reviews](#example-usage-of-list_reviews)
  - [rating](#rating)
    + [Example usage of rating](#example-usage-of-rating)
  - [reviews](#reviews)
    + [Example usage of reviews](#example-usage-of-reviews)
6. [settings](#settings)
  - [clear_caches](#clear_caches)
    + [Example usage of clear_caches](#example-usage-of-clear_caches)
  - [disabled_questions](#disabled_questions)
    + [Example usage of disabled_questions](#example-usage-of-disabled_questions)
  - [gps_all_tags](#gps_all_tags)
    + [Example usage of gps_all_tags](#example-usage-of-gps_all_tags)
  - [gyroscope_all_tags](#gyroscope_all_tags)
    + [Example usage of gyroscope_all_tags](#example-usage-of-gyroscope_all_tags)
  - [import_mangrove_key](#import_mangrove_key)
    + [Example usage of import_mangrove_key](#example-usage-of-import_mangrove_key)
  - [login_button](#login_button)
    + [Example usage of login_button](#example-usage-of-login_button)
  - [logout](#logout)
    + [Example usage of logout](#example-usage-of-logout)
7. [Unclassified elements](#unclassified-elements)
  - [add_new_point](#add_new_point)
    + [Example usage of add_new_point](#example-usage-of-add_new_point)
  - [add_note_comment](#add_note_comment)
    + [Example usage of add_note_comment](#example-usage-of-add_note_comment)
  - [all_tags](#all_tags)
    + [Example usage of all_tags](#example-usage-of-all_tags)
  - [auto_apply](#auto_apply)
    + [Example usage of auto_apply](#example-usage-of-auto_apply)
  - [braced](#braced)
    + [Example usage of braced](#example-usage-of-braced)
  - [canonical](#canonical)
    + [Example usage of canonical](#example-usage-of-canonical)
  - [clear_location_history](#clear_location_history)
    + [Example usage of clear_location_history](#example-usage-of-clear_location_history)
  - [close_note](#close_note)
    + [Example usage of close_note](#example-usage-of-close_note)
  - [compare_data](#compare_data)
    + [Example usage of compare_data](#example-usage-of-compare_data)
  - [conflate_button](#conflate_button)
    + [Specifying which tags to copy or add](#specifying-which-tags-to-copy-or-add)
    + [Importing a dataset into OpenStreetMap: requirements](#importing-a-dataset-into-openstreetmap-requirements)
    + [Disabled in unofficial themes](#disabled-in-unofficial-themes)
    + [Example usage of conflate_button](#example-usage-of-conflate_button)
  - [direction_absolute](#direction_absolute)
    + [Example usage of direction_absolute](#example-usage-of-direction_absolute)
  - [direction_indicator](#direction_indicator)
    + [Example usage of direction_indicator](#example-usage-of-direction_indicator)
  - [export_as_geojson](#export_as_geojson)
    + [Example usage of export_as_geojson](#example-usage-of-export_as_geojson)
  - [export_as_gpx](#export_as_gpx)
    + [Example usage of export_as_gpx](#example-usage-of-export_as_gpx)
  - [fediverse_link](#fediverse_link)
    + [Example usage of fediverse_link](#example-usage-of-fediverse_link)
  - [group](#group)
    + [Example usage of group](#example-usage-of-group)
  - [histogram](#histogram)
    + [Example usage of histogram](#example-usage-of-histogram)
  - [import_button](#import_button)
    + [Specifying which tags to copy or add](#specifying-which-tags-to-copy-or-add)
    + [Importing a dataset into OpenStreetMap: requirements](#importing-a-dataset-into-openstreetmap-requirements)
    + [Disabled in unofficial themes](#disabled-in-unofficial-themes)
    + [Example usage of import_button](#example-usage-of-import_button)
  - [import_way_button](#import_way_button)
    + [Specifying which tags to copy or add](#specifying-which-tags-to-copy-or-add)
    + [Importing a dataset into OpenStreetMap: requirements](#importing-a-dataset-into-openstreetmap-requirements)
    + [Disabled in unofficial themes](#disabled-in-unofficial-themes)
    + [Example usage of import_way_button](#example-usage-of-import_way_button)
  - [language_chooser](#language_chooser)
    + [Example usage of language_chooser](#example-usage-of-language_chooser)
  - [language_picker](#language_picker)
    + [Example usage of language_picker](#example-usage-of-language_picker)
  - [link](#link)
    + [Example usage of link](#example-usage-of-link)
  - [linked_data_from_website](#linked_data_from_website)

#### Using expanded syntax 

Instead of using `{"render": {"en": "{some_special_visualisation(some_arg, some other really long message, more args)} , "nl": "{some_special_visualisation(some_arg, een boodschap in een andere taal, more args)}}`, one can also write

```
{
  "render": {
    "special": {
      "type": "some_special_visualisation",
      "argname": "some_arg",
      "message": {
        "en": "some other really long message",
        "nl": "een boodschap in een andere taal"
      },
      "other_arg_name": "more args"
    },
    "before": {
      "en": "Some text to prefix before the special element (e.g. a title)",
      "nl": "Een tekst om voor het element te zetten (bv. een titel)"
    },
    "after": {
      "en": "Some text to put after the element, e.g. a footer"
    }
  }
}
```

In other words: use `{ "before": ..., "after": ..., "special": {"type": ..., "argname": ...argvalue...}`. The args are in the `special` block; an argvalue can be a string, a translation or another value. (Refer to class `RewriteSpecial` in case of problems)

## default

These special visualisations are interactive components that most elements get by default. You'll normally won't need them in custom layers

### delete_button

Adds a button which allows to delete the object at this location. The config will be read from the layer config

#### Example usage of delete_button

<code>`{delete_button()}`</code>

### if_nothing_known

Shows a 'nothing is currently known-message if there is at least one unanswered question and no known (answerable) question

| name | default | description |
-----|-----|----- |
| text | _undefined_ | Text to show |
| cssClasses | _undefined_ | Classes to apply onto the text |

#### Example usage of if_nothing_known

<code>`{if_nothing_known(,)}`</code>

### minimap

A small map showing the selected feature.

| name | default | description |
-----|-----|----- |
| zoomlevel | 18 | The (maximum) zoomlevel: the target zoomlevel after fitting the entire feature. The minimap will fit the entire feature, then zoom out to this zoom level. The higher, the more zoomed in with 1 being the entire world and 19 being really close |
| idKey | id | (Matches all resting arguments) This argument should be the key of a property of the feature. The corresponding value is interpreted as either the id or the a list of ID's. The features with these ID's will be shown on this minimap. (Note: if the key is 'id', list interpration is disabled) |

#### Example usage of minimap

<code>`{minimap()}`, `{minimap(17, id, _list_of_embedded_feature_ids_calculated_by_calculated_tag):height:10rem; border: 2px solid black}`</code>

### move_button

Adds a button which allows to move the object to another location. The config will be read from the layer config

#### Example usage of move_button

<code>`{move_button()}`</code>

### qr_code

Generates a QR-code to share the selected object

#### Example usage of qr_code

<code>`{qr_code()}`</code>

### share_link

Creates a link that (attempts to) open the native 'share'-screen

| name | default | description |
-----|-----|----- |
| url | _undefined_ | The url to share (default: current URL) |
| text | _undefined_ | The text to show on the button. If none is given, will act as a titleIcon |

#### Example usage of share_link

<code>{share_link()} to share the current page, {share_link(<some_url>)} to share the given url</code>

### split_button

Adds a button which allows to split a way

#### Example usage of split_button

<code>`{split_button()}`</code>

## favourites

Elements relating to marking an object as favourite (giving it a heart). Default element

### favourite_icon

A small button that allows a (logged in) contributor to mark a location as a favourite location, sized to fit a title-icon

#### Example usage of favourite_icon

<code>`{favourite_icon()}`</code>

### favourite_status

A button that allows a (logged in) contributor to mark a location as a favourite location

#### Example usage of favourite_status

<code>`{favourite_status()}`</code>

## images

Elements related to adding or manipulating images. Normally also added by default, but in some cases a tweaked version is needed

### image_carousel

Creates an image carousel for the given sources. An attempt will be made to guess what source is used. Supported: Wikidata identifiers, Wikipedia pages, Wikimedia categories, IMGUR (with attribution, direct links)

| name | default | description |
-----|-----|----- |
| image_key | image,mapillary,image,wikidata,wikimedia_commons,image,panoramax,image | The keys given to the images, e.g. if <span class='literal-code'>image</span> is given, the first picture URL will be added as <span class='literal-code'>image</span>, the second as <span class='literal-code'>image:0</span>, the third as <span class='literal-code'>image:1</span>, etc... Multiple values are allowed if ';'-separated  |

#### Example usage of image_carousel

<code>`{image_carousel(image,mapillary,image,wikidata,wikimedia_commons,image,panoramax,image)}`</code>

### image_upload

Creates a button where a user can upload an image to IMGUR

| name | default | description |
-----|-----|----- |
| image-key | _undefined_ | Image tag to add the URL to (or image-tag:0, image-tag:1 when multiple images are added) |
| label | _undefined_ | The text to show on the button |
| disable_blur | _undefined_ | If set to 'true' or 'yes', then face blurring will be disabled. To be used sparingly |

#### Example usage of image_upload

<code>`{image_upload(,,)}`</code>

## notes

Elements relating to OpenStreetMap-notes, e.g. the component to close and/or add a comment

### add_image_to_note

Adds an image to a node

| name | default | description |
-----|-----|----- |
| Id-key | id | The property name where the ID of the note to close can be found |

#### Example usage of add_image_to_note

<code>`{add_image_to_note(id)}`</code>

### open_note

Creates a new map note on the given location. This options is placed in the 'last_click'-popup automatically if the 'notes'-layer is enabled

#### Example usage of open_note

<code>`{open_note()}`</code>

## reviews

Elements relating to seeing and adding ratings and reviews with Mangrove.reviews

### create_review

Invites the contributor to leave a review. Somewhat small UI-element until interacted

| name | default | description |
-----|-----|----- |
| subjectKey | name | The key to use to determine the subject. If specified, the subject will be <b>tags[subjectKey]</b> |
| fallback | _undefined_ | The identifier to use, if <i>tags[subjectKey]</i> as specified above is not available. This is effectively a fallback value |
| question | _undefined_ | The question to ask during the review |

#### Example usage of create_review

<code>`{create_review(name,,)}`</code>

### list_reviews

Adds an overview of the mangrove-reviews of this object. Mangrove.Reviews needs - in order to identify the reviewed object - a coordinate and a name. By default, the name of the object is given, but this can be overwritten

| name | default | description |
-----|-----|----- |
| subjectKey | name | The key to use to determine the subject. If specified, the subject will be <b>tags[subjectKey]</b> |
| fallback | _undefined_ | The identifier to use, if <i>tags[subjectKey]</i> as specified above is not available. This is effectively a fallback value |

#### Example usage of list_reviews

<code>`{list_reviews(name,)}`</code>

### rating

Shows stars which represent the average rating on mangrove.

| name | default | description |
-----|-----|----- |
| subjectKey | name | The key to use to determine the subject. If the value is specified, the subject will be <b>tags[subjectKey]</b> and will use this to filter the reviews. |
| fallback | _undefined_ | The identifier to use, if <i>tags[subjectKey]</i> as specified above is not available. This is effectively a fallback value |

#### Example usage of rating

<code>`{rating(name,)}`</code>

### reviews

A pragmatic combination of `create_review` and `list_reviews`

| name | default | description |
-----|-----|----- |
| subjectKey | name | The key to use to determine the subject. If specified, the subject will be <b>tags[subjectKey]</b> |
| fallback | _undefined_ | The identifier to use, if <i>tags[subjectKey]</i> as specified above is not available. This is effectively a fallback value |
| question | _undefined_ | The question to ask in the review form. Optional |

#### Example usage of reviews

<code>`{reviews()}` for a vanilla review, `{reviews(name, play_forest)}` to review a play forest. If a name is known, the name will be used as identifier, otherwise 'play_forest' is used</code>

## settings

Elements part of the usersettings-ui

### clear_caches

A button which clears the locally downloaded data and the service worker. Login status etc will be kept

| name | default | description |
-----|-----|----- |
| text | _undefined_ | The text to show on the button |

#### Example usage of clear_caches

<code>`{clear_caches()}`</code>

### disabled_questions

Shows which questions are disabled for every layer. Used in 'settings'

#### Example usage of disabled_questions

<code>`{disabled_questions()}`</code>

### gps_all_tags

Shows the current tags of the GPS-representing object, used for debugging

#### Example usage of gps_all_tags

<code>`{gps_all_tags()}`</code>

### gyroscope_all_tags

Shows the current tags of the GPS-representing object, used for debugging

#### Example usage of gyroscope_all_tags

<code>`{gyroscope_all_tags()}`</code>

### import_mangrove_key

Only makes sense in the usersettings. Allows to import a mangrove public key and to use this to make reviews

| name | default | description |
-----|-----|----- |
| text | _undefined_ | The text that is shown on the button |

#### Example usage of import_mangrove_key

<code>`{import_mangrove_key()}`</code>

### login_button

Show a login button

#### Example usage of login_button

<code>`{login_button()}`</code>

### logout

Shows a button where the user can log out

#### Example usage of logout

<code>`{logout()}`</code>

## Unclassified elements

Various elements

### add_new_point

An element which allows to add a new point on the 'last_click'-location. Only makes sense in the layer `last_click`

#### Example usage of add_new_point

<code>`{add_new_point()}`</code>

### add_note_comment

A textfield to add a comment to a node (with the option to close the note).

| name | default | description |
-----|-----|----- |
| Id-key | id | The property name where the ID of the note to close can be found |

#### Example usage of add_note_comment

<code>`{add_note_comment(id)}`</code>

### all_tags

Prints all key-value pairs of the object - used for debugging

#### Example usage of all_tags

<code>`{all_tags()}`</code>

### auto_apply

        A button to run many actions for many features at once.
        To effectively use this button, you'll need some ingredients:

        1. A target layer with features for which an action is defined in a tag rendering. The following special visualisations support an autoAction: tag_apply, import_way_button, conflate_button
        2. A host feature to place the auto-action on. This can be a big outline (such as a city). Another good option for this is the layer [current_view](./BuiltinLayers.md#current_view)
        3. Then, use a calculated tag on the host feature to determine the overlapping object ids
        4. At last, add this component

| name | default | description |
-----|-----|----- |
| target_layer | _undefined_ | The layer that the target features will reside in |
| target_feature_ids | _undefined_ | The key, of which the value contains a list of ids |
| tag_rendering_id | _undefined_ | The ID of the tagRendering containing the autoAction. This tagrendering will be calculated. The embedded actions will be executed |
| text | _undefined_ | The text to show on the button |
| icon | ./assets/svg/robot.svg | The icon to show on the button |

#### Example usage of auto_apply

<code>`{auto_apply(,,,,./assets/svg/robot.svg)}`</code>

### braced

Show a literal text within braces

| name | default | description |
-----|-----|----- |
| text | _undefined_ | The value to show |

#### Example usage of braced

<code>`{braced()}`</code>

### canonical

Converts a short, canonical value into the long, translated text including the unit. This only works if a `unit` is defined for the corresponding value. The unit specification will be included in the text. 

| name | default | description |
-----|-----|----- |
| key | _undefined_ | The key of the tag to give the canonical text for |

#### Example usage of canonical

<code>If the object has `length=42`, then `{canonical(length)}` will be shown as **42 meter** (in english), **42 metre** (in french), ...</code>

### clear_location_history

A button to remove the travelled track information from the device

#### Example usage of clear_location_history

<code>`{clear_location_history()}`</code>

### close_note

Button to close a note. A predefined text can be defined to close the note with. If the note is already closed, will show a small text.

| name | default | description |
-----|-----|----- |
| text | _undefined_ | Text to show on this button |
| icon | checkmark.svg | Icon to show |
| idkey | id | The property name where the ID of the note to close can be found |
| comment | _undefined_ | Text to add onto the note when closing |
| minZoom | _undefined_ | If set, only show the closenote button if zoomed in enough |
| zoomButton | _undefined_ | Text to show if not zoomed in enough |

#### Example usage of close_note

<code>`{close_note(,checkmark.svg,id,,,)}`</code>

### compare_data

Gives an interactive element which shows a tag comparison between the OSM-object and the upstream object. This allows to copy some or all tags into OSM

| name | default | description |
-----|-----|----- |
| url | _undefined_ | The attribute containing the url where to fetch more data |
| host | _undefined_ | The domain name(s) where data might be fetched from - this is needed to set the CSP. A domain must include 'https', e.g. 'https://example.com'. For multiple domains, separate them with ';'. If you don't know the possible domains, use '*'.  |
| readonly | _undefined_ | If 'yes', will not show 'apply'-buttons |

#### Example usage of compare_data

<code>`{compare_data(,,)}`</code>

### conflate_button

This button will modify the geometry of an existing OSM way to match the specified geometry. This can conflate OSM-ways with LineStrings and Polygons (only simple polygons with one single ring). An attempt is made to move points with special values to a decent new location (e.g. entrances)

Note that the contributor must zoom to at least zoomlevel 18 to be able to use this functionality.
    It is only functional in official themes, but can be tested in unoffical themes.

#### Specifying which tags to copy or add

    The argument `tags` of the import button takes a `;`-seperated list of tags to add (or the name of a property which contains a JSON-list of properties).

These can either be a tag to add, such as `amenity=fast_food` or can use a substitution, e.g. `addr:housenumber=$number`.
This new point will then have the tags `amenity=fast_food` and `addr:housenumber` with the value that was saved in `number` in the original feature.

If a value to substitute is undefined, empty string will be used instead.

This supports multiple values, e.g. `ref=$source:geometry:type/$source:geometry:ref`

Remark that the syntax is slightly different then expected; it uses '$' to note a value to copy, followed by a name (matched with `[a-zA-Z0-9_:]*`). Sadly, delimiting with `{}` as these already mark the boundaries of the special rendering...

Note that these values can be prepare with javascript in the theme by using a [calculatedTag](calculatedTags.md#calculating-tags-with-javascript)
 
#### Importing a dataset into OpenStreetMap: requirements

If you want to import a dataset, make sure that:

1. The dataset to import has a suitable license
2. The community has been informed of the import
3. All other requirements of the [import guidelines](https://wiki.openstreetmap.org/wiki/Import/Guidelines) have been followed

There are also some technicalities in your theme to keep in mind:

1. The new feature will be added and will flow through the program as any other new point as if it came from OSM.
    This means that there should be a layer which will match the new tags and which will display it.
2. The original feature from your geojson layer will gain the tag '_imported=yes'.
    This should be used to change the appearance or even to hide it (eg by changing the icon size to zero)
3. There should be a way for the theme to detect previously imported points, even after reloading.
    A reference number to the original dataset is an excellent way to do this
4. When importing ways, the theme creator is also responsible of avoiding overlapping ways.

#### Disabled in unofficial themes

The import button can be tested in an unofficial theme by adding `test=true` or `backend=osm-test` as [URL-paramter](URL_Parameters.md).
The import button will show up then. If in testmode, you can read the changeset-XML directly in the web console.
In the case that MapComplete is pointed to the testing grounds, the edit will be made on https://master.apis.dev.openstreetmap.org

| name | default | description |
-----|-----|----- |
| targetLayer | _undefined_ | The id of the layer where this point should end up. This is not very strict, it will simply result in checking that this layer is shown preventing possible duplicate elements |
| tags | _undefined_ | The tags to add onto the new object - see specification above. If this is a key (a single word occuring in the properties of the object), the corresponding value is taken and expanded instead |
| text | Import this data into OpenStreetMap | The text to show on the button |
| icon | ./assets/svg/addSmall.svg | A nice icon to show in the button |
| way_to_conflate | _undefined_ | The key, of which the corresponding value is the id of the OSM-way that must be conflated; typically a calculatedTag |

#### Example usage of conflate_button

<code>`{conflate_button(,,Import this data into OpenStreetMap,./assets/svg/addSmall.svg,)}`</code>

### direction_absolute

Converts compass degrees (with 0° being north, 90° being east, ...) into a human readable, translated direction such as 'north', 'northeast'

| name | default | description |
-----|-----|----- |
| key | _direction:centerpoint | The attribute containing the degrees |

#### Example usage of direction_absolute

<code>`{direction_absolute(_direction:centerpoint)}`</code>

### direction_indicator

Gives a distance indicator and a compass pointing towards the location from your GPS-location. If clicked, centers the map on the object

#### Example usage of direction_indicator

<code>`{direction_indicator()}`</code>

### export_as_geojson

Exports the selected feature as GeoJson-file

#### Example usage of export_as_geojson

<code>`{export_as_geojson()}`</code>

### export_as_gpx

Exports the selected feature as GPX-file

#### Example usage of export_as_gpx

<code>`{export_as_gpx()}`</code>

### fediverse_link

Converts a fediverse username or link into a clickable link

| name | default | description |
-----|-----|----- |
| key | _undefined_ | The attribute-name containing the link |

#### Example usage of fediverse_link

<code>`{fediverse_link()}`</code>

### group

A collapsable group (accordion)

| name | default | description |
-----|-----|----- |
| header | _undefined_ | The _identifier_ of a single tagRendering. This will be used as header |
| labels | _undefined_ | A `;`-separated list of either identifiers or label names. All tagRenderings matching this value will be shown in the accordion |

#### Example usage of group

<code>`{group(,)}`</code>

### histogram

Create a histogram for a list of given values, read from the properties.

| name | default | description |
-----|-----|----- |
| key | _undefined_ | The key to be read and to generate a histogram from |
| title | _empty string_ | This text will be placed above the texts (in the first column of the visulasition) |
| countHeader | _empty string_ | This text will be placed above the bars |
| colors* | _undefined_ | (Matches all resting arguments - optional) Matches a regex onto a color value, e.g. `3[a-zA-Z+-]*:#33cc33` |

#### Example usage of histogram

<code>`{histogram('some_key')}` with properties being `{some_key: ["a","b","a","c"]} to create a histogram</code>

### import_button

This button will copy the point from an external dataset into OpenStreetMap

Note that the contributor must zoom to at least zoomlevel 18 to be able to use this functionality.
    It is only functional in official themes, but can be tested in unoffical themes.

#### Specifying which tags to copy or add

    The argument `tags` of the import button takes a `;`-seperated list of tags to add (or the name of a property which contains a JSON-list of properties).

These can either be a tag to add, such as `amenity=fast_food` or can use a substitution, e.g. `addr:housenumber=$number`.
This new point will then have the tags `amenity=fast_food` and `addr:housenumber` with the value that was saved in `number` in the original feature.

If a value to substitute is undefined, empty string will be used instead.

This supports multiple values, e.g. `ref=$source:geometry:type/$source:geometry:ref`

Remark that the syntax is slightly different then expected; it uses '$' to note a value to copy, followed by a name (matched with `[a-zA-Z0-9_:]*`). Sadly, delimiting with `{}` as these already mark the boundaries of the special rendering...

Note that these values can be prepare with javascript in the theme by using a [calculatedTag](calculatedTags.md#calculating-tags-with-javascript)
 
#### Importing a dataset into OpenStreetMap: requirements

If you want to import a dataset, make sure that:

1. The dataset to import has a suitable license
2. The community has been informed of the import
3. All other requirements of the [import guidelines](https://wiki.openstreetmap.org/wiki/Import/Guidelines) have been followed

There are also some technicalities in your theme to keep in mind:

1. The new feature will be added and will flow through the program as any other new point as if it came from OSM.
    This means that there should be a layer which will match the new tags and which will display it.
2. The original feature from your geojson layer will gain the tag '_imported=yes'.
    This should be used to change the appearance or even to hide it (eg by changing the icon size to zero)
3. There should be a way for the theme to detect previously imported points, even after reloading.
    A reference number to the original dataset is an excellent way to do this
4. When importing ways, the theme creator is also responsible of avoiding overlapping ways.

#### Disabled in unofficial themes

The import button can be tested in an unofficial theme by adding `test=true` or `backend=osm-test` as [URL-paramter](URL_Parameters.md).
The import button will show up then. If in testmode, you can read the changeset-XML directly in the web console.
In the case that MapComplete is pointed to the testing grounds, the edit will be made on https://master.apis.dev.openstreetmap.org

| name | default | description |
-----|-----|----- |
| targetLayer | _undefined_ | The id of the layer where this point should end up. This is not very strict, it will simply result in checking that this layer is shown preventing possible duplicate elements |
| tags | _undefined_ | The tags to add onto the new object - see specification above. If this is a key (a single word occuring in the properties of the object), the corresponding value is taken and expanded instead |
| text | Import this data into OpenStreetMap | The text to show on the button |
| icon | ./assets/svg/addSmall.svg | A nice icon to show in the button |
| snap_onto_layers | _undefined_ | If a way of the given layer(s) is closeby, will snap the new point onto this way (similar as preset might snap). To show multiple layers to snap onto, use a `;`-seperated list |
| max_snap_distance | 5 | The maximum distance that the imported point will be moved to snap onto a way in an already existing layer (in meters). This is previewed to the contributor, similar to the 'add new point'-action of MapComplete |
| note_id | _undefined_ | If given, this key will be read. The corresponding note on OSM will be closed, stating 'imported' |
| maproulette_id | _undefined_ | The property name of the maproulette_id - this is probably `mr_taskId`. If given, the maproulette challenge will be marked as fixed. Only use this if part of a maproulette-layer. |
| to_point | _undefined_ | If set, a feature will be converted to a centerpoint |

#### Example usage of import_button

<code>`{import_button(,,Import this data into OpenStreetMap,./assets/svg/addSmall.svg,,5,,,)}`</code>

### import_way_button

This button will copy the data from an external dataset into OpenStreetMap, copying the geometry and adding it as a 'line'

Note that the contributor must zoom to at least zoomlevel 18 to be able to use this functionality.
    It is only functional in official themes, but can be tested in unoffical themes.

#### Specifying which tags to copy or add

    The argument `tags` of the import button takes a `;`-seperated list of tags to add (or the name of a property which contains a JSON-list of properties).

These can either be a tag to add, such as `amenity=fast_food` or can use a substitution, e.g. `addr:housenumber=$number`.
This new point will then have the tags `amenity=fast_food` and `addr:housenumber` with the value that was saved in `number` in the original feature.

If a value to substitute is undefined, empty string will be used instead.

This supports multiple values, e.g. `ref=$source:geometry:type/$source:geometry:ref`

Remark that the syntax is slightly different then expected; it uses '$' to note a value to copy, followed by a name (matched with `[a-zA-Z0-9_:]*`). Sadly, delimiting with `{}` as these already mark the boundaries of the special rendering...

Note that these values can be prepare with javascript in the theme by using a [calculatedTag](calculatedTags.md#calculating-tags-with-javascript)
 
#### Importing a dataset into OpenStreetMap: requirements

If you want to import a dataset, make sure that:

1. The dataset to import has a suitable license
2. The community has been informed of the import
3. All other requirements of the [import guidelines](https://wiki.openstreetmap.org/wiki/Import/Guidelines) have been followed

There are also some technicalities in your theme to keep in mind:

1. The new feature will be added and will flow through the program as any other new point as if it came from OSM.
    This means that there should be a layer which will match the new tags and which will display it.
2. The original feature from your geojson layer will gain the tag '_imported=yes'.
    This should be used to change the appearance or even to hide it (eg by changing the icon size to zero)
3. There should be a way for the theme to detect previously imported points, even after reloading.
    A reference number to the original dataset is an excellent way to do this
4. When importing ways, the theme creator is also responsible of avoiding overlapping ways.

#### Disabled in unofficial themes

The import button can be tested in an unofficial theme by adding `test=true` or `backend=osm-test` as [URL-paramter](URL_Parameters.md).
The import button will show up then. If in testmode, you can read the changeset-XML directly in the web console.
In the case that MapComplete is pointed to the testing grounds, the edit will be made on https://master.apis.dev.openstreetmap.org

| name | default | description |
-----|-----|----- |
| targetLayer | _undefined_ | The id of the layer where this point should end up. This is not very strict, it will simply result in checking that this layer is shown preventing possible duplicate elements |
| tags | _undefined_ | The tags to add onto the new object - see specification above. If this is a key (a single word occuring in the properties of the object), the corresponding value is taken and expanded instead |
| text | Import this data into OpenStreetMap | The text to show on the button |
| icon | ./assets/svg/addSmall.svg | A nice icon to show in the button |
| snap_to_point_if | _undefined_ | Points with the given tags will be snapped to or moved |
| max_snap_distance | 0.05 | If the imported object is a LineString or (Multi)Polygon, already existing OSM-points will be reused to construct the geometry of the newly imported way |
| move_osm_point_if | _undefined_ | Moves the OSM-point to the newly imported point if these conditions are met |
| max_move_distance | 0.05 | If an OSM-point is moved, the maximum amount of meters it is moved. Capped on 20m |
| snap_onto_layers | _undefined_ | If no existing nearby point exists, but a line of a specified layer is closeby, snap to this layer instead |
| snap_to_layer_max_distance | 0.1 | Distance to distort the geometry to snap to this layer |

#### Example usage of import_way_button

<code>`{import_way_button(,,Import this data into OpenStreetMap,./assets/svg/addSmall.svg,,0.05,,0.05,,0.1)}`</code>

### language_chooser

The language element allows to show and pick all known (modern) languages. The key can be set

| name | default | description |
-----|-----|----- |
| key | _undefined_ | What key to use, e.g. `language`, `tactile_writing:braille:language`, ... If a language is supported, the language code will be appended to this key, resulting in `language:nl=yes` if nl is picked  |
| question | _undefined_ | What to ask if no questions are known |
| render_list_item | {language()} | How a single language will be shown in the list of languages. Use `{language}` to indicate the language (which it must contain). |
| render_single_language | _undefined_ | What will be shown if the feature only supports a single language |
| render_all | {list()} | The full rendering. Use `{list}` to show where the list of languages must come. Optional if mode=single |
| no_known_languages | _undefined_ | The text that is shown if no languages are known for this key. If this text is omitted, the languages will be prompted instead |

#### Example usage of language_chooser

<code>`{language_chooser(,,{language()},,{list()},)}`</code>

### language_picker

A component to set the language of the user interface

#### Example usage of language_picker

<code>`{language_picker()}`</code>

### link

Construct a link. By using the 'special' visualisation notation, translations should be easier

| name | default | description |
-----|-----|----- |
| text | _undefined_ | Text to be shown |
| href | _undefined_ | The URL to link to. Note that this will be URI-encoded before  |
| class | _undefined_ | CSS-classes to add to the element |
| download | _undefined_ | Expects a string which denotes the filename to download the contents of `href` into. If set, this link will act as a download-button. |
| arialabel | _undefined_ | If set, this text will be used as aria-label |
| icon | _undefined_ | If set, show this icon next to the link. You might want to combine this with `class: button` |

#### Example usage of link

<code>`{link(,,,,,)}`</code>

### linked_data_from_website

Attempts to load (via a proxy) the specified website and parsed ld+json from there. Suitable data will be offered to import into OSM

| name | default | description |
-----|-----|----- |
| key | website | Attempt to load ld+json from the specified URL. This can be in an embedded <script type='ld+json'> |
| useProxy | yes | If 'yes', uses the provided proxy server. This proxy server will scrape HTML and search for a script with `lang='ld+json'`. If `no`, the data will be downloaded and expects a linked-data-json directly |
| host | _undefined_ | If not using a proxy, define what host the website is allowed to connect to |
| mode | _undefined_ | If `display`, only show the data in tabular and readonly form, ignoring already existing tags. This is used to explicitly show all the tags. If unset or anything else, allow to apply/import on OSM |
| collapsed | yes | If the containing accordion should be closed |

#### Example usage of linked_data_from_website

<code>`{linked_data_from_website(website,yes,,,yes)}`</code>

### mapillary_link

Adds a button to open mapillary on the specified location

| name | default | description |
-----|-----|----- |
| zoom | 18 | The startzoom of mapillary |

#### Example usage of mapillary_link

<code>`{mapillary_link(18)}`</code>

### maproulette_set_status

Change the status of the given MapRoulette task

| name | default | description |
-----|-----|----- |
| message | _undefined_ | A message to show to the user |
| image | confirm | Image to show |
| message_confirm | _undefined_ | What to show when the task is closed, either by the user or was already closed. |
| status | 1 | A statuscode to apply when the button is clicked. 1 = `close`, 2 = `false_positive`, 3 = `skip`, 4 = `deleted`, 5 = `already fixed` (on the map, e.g. for duplicates), 6 = `too hard` |
| maproulette_id | mr_taskId | The property name containing the maproulette id |
| ask_feedback | _empty string_ | If not an empty string, this will be used as question to ask some additional feedback. A text field will be added |

#### Example usage of maproulette_set_status

<code> The following example sets the status to '2' (false positive)

```json
{
   "id": "mark_duplicate",
   "render": {
      "special": {
         "type": "maproulette_set_status",
         "message": {
            "en": "Mark as not found or false positive"
         },
         "status": "2",
         "image": "close"
      }
   }
}
```</code>

### maproulette_task

Fetches the metadata of MapRoulette campaign that this task is part of and shows those details (namely `title`, `description` and `instruction`).

This reads the property `mr_challengeId` to detect the parent campaign.

#### Example usage of maproulette_task

<code>`{maproulette_task()}`</code>

### multi

Given an embedded tagRendering (read only) and a key, will read the keyname as a JSON-list. Every element of this list will be considered as tags and rendered with the tagRendering

| name | default | description |
-----|-----|----- |
| key | _undefined_ | The property to read and to interpret as a list of properties |
| tagrendering | _undefined_ | An entire tagRenderingConfig |
| classes | _undefined_ | CSS-classes to apply on every individual item. Seperated by `space` |

#### Example usage of multi

<code>```json
{
  "render": {
    "special": {
      "type": "multi",
      "key": "_doors_from_building_properties",
      "tagrendering": {
        "en": "The building containing this feature has a <a href='#{id}'>door</a> of width {entrance:width}"
      }
    }
  }
}
```</code>

### multi_apply

A button to apply the tagging of this object onto a list of other features. This is an advanced feature for which you'll need calculatedTags

| name | default | description |
-----|-----|----- |
| feature_ids | _undefined_ | A JSON-serialized list of IDs of features to apply the tagging on |
| keys | _undefined_ | One key (or multiple keys, seperated by ';') of the attribute that should be copied onto the other features. |
| text | _undefined_ | The text to show on the button |
| autoapply | _undefined_ | A boolean indicating wether this tagging should be applied automatically if the relevant tags on this object are changed. A visual element indicating the multi_apply is still shown |
| overwrite | _undefined_ | If set to 'true', the tags on the other objects will always be overwritten. The default behaviour will be to only change the tags on other objects if they are either undefined or had the same value before the change |

#### Example usage of multi_apply

<code>{multi_apply(_features_with_the_same_name_within_100m, name:etymology:wikidata;name:etymology, Apply etymology information on all nearby objects with the same name)}</code>

### nearby_images

A component showing nearby images loaded from various online services such as Mapillary. In edit mode and when used on a feature, the user can select an image to add to the feature

| name | default | description |
-----|-----|----- |
| mode | closed | Either `open` or `closed`. If `open`, then the image carousel will always be shown |
| readonly | _undefined_ | If 'readonly' or 'yes', will not show the 'link'-button |

#### Example usage of nearby_images

<code>`{nearby_images(closed,)}`</code>

### open_in_iD

Opens the current view in the iD-editor

#### Example usage of open_in_iD

<code>`{open_in_iD()}`</code>

### open_in_josm

Opens the current view in the JOSM-editor

#### Example usage of open_in_josm

<code>`{open_in_josm()}`</code>

### opening_hours_state

A small element, showing if the POI is currently open and when the next change is

| name | default | description |
-----|-----|----- |
| key | opening_hours | The tagkey from which the opening hours are read. |
| prefix | _empty string_ | Remove this string from the start of the value before parsing. __Note: use `&LPARENs` to indicate `(` if needed__ |
| postfix | _empty string_ | Remove this string from the end of the value before parsing. __Note: use `&RPARENs` to indicate `)` if needed__ |

#### Example usage of opening_hours_state

<code>`{opening_hours_state(opening_hours,,)}`</code>

### opening_hours_table

Creates an opening-hours table. Usage: {opening_hours_table(opening_hours)} to create a table of the tag 'opening_hours'.

| name | default | description |
-----|-----|----- |
| key | opening_hours | The tagkey from which the table is constructed. |
| prefix | _empty string_ | Remove this string from the start of the value before parsing. __Note: use `&LPARENs` to indicate `(` if needed__ |
| postfix | _empty string_ | Remove this string from the end of the value before parsing. __Note: use `&RPARENs` to indicate `)` if needed__ |

#### Example usage of opening_hours_table

<code>A normal opening hours table can be invoked with `{opening_hours_table()}`. A table for e.g. conditional access with opening hours can be `{opening_hours_table(access:conditional, no @ &LPARENS, &RPARENS)}`</code>

### pending_changes

A module showing the pending changes, with the option to clear the pending changes

#### Example usage of pending_changes

<code>`{pending_changes()}`</code>

### plantnet_detection

Sends the images linked to the current object to plantnet.org and asks it what plant species is shown on it. The user can then select the correct species; the corresponding wikidata-identifier will then be added to the object (together with `source:species:wikidata=plantnet.org AI`). 

| name | default | description |
-----|-----|----- |
| image_key | image,mapillary,image,wikidata,wikimedia_commons,image,panoramax,image | The keys given to the images, e.g. if <span class='literal-code'>image</span> is given, the first picture URL will be added as <span class='literal-code'>image</span>, the second as <span class='literal-code'>image:0</span>, the third as <span class='literal-code'>image:1</span>, etc... Multiple values are allowed if ';'-separated  |

#### Example usage of plantnet_detection

<code>`{plantnet_detection(image,mapillary,image,wikidata,wikimedia_commons,image,panoramax,image)}`</code>

### preset_description

Shows the extra description from the presets of the layer, if one matches. It will pick the most specific one (e.g. if preset `A` implies `B`, but `B` does not imply `A`, it'll pick B) or the first one if no ordering can be made. Might be empty

#### Example usage of preset_description

<code>`{preset_description()}`</code>

### preset_type_select

An editable tag rendering which allows to change the type

#### Example usage of preset_type_select

<code>`{preset_type_select()}`</code>

### questions

The special element which shows the questions which are unkown. Added by default if not yet there

| name | default | description |
-----|-----|----- |
| labels | _undefined_ | One or more ';'-separated labels. If these are given, only questions with these labels will be given. Use `unlabeled` for all questions that don't have an explicit label. If none given, all questions will be shown |
| blacklisted-labels | _undefined_ | One or more ';'-separated labels of questions which should _not_ be included |

#### Example usage of questions

<code>`{questions(,)}`</code>

### send_email

Creates a `mailto`-link where some fields are already set and correctly escaped. The user will be promted to send the email

| name | default | description |
-----|-----|----- |
| to | _undefined_ | Who to send the email to? |
| subject | _undefined_ | The subject of the email |
| body | _undefined_ | The text in the email |
| button_text | _undefined_ | The text shown on the button in the UI |

#### Example usage of send_email

<code>`{send_email(,,,)}`</code>

### statistics

Show general statistics about the elements currently in view. Intended to use on the `current_view`-layer

#### Example usage of statistics

<code>`{statistics()}`</code>

### steal

Shows a tagRendering from a different object as if this was the object itself

| name | default | description |
-----|-----|----- |
| featureId | _undefined_ | The key of the attribute which contains the id of the feature from which to use the tags |
| tagRenderingId | _undefined_ | The layer-id and tagRenderingId to render. Can be multiple value if ';'-separated (in which case every value must also contain the layerId, e.g. `layerId.tagRendering0; layerId.tagRendering1`). Note: this can cause layer injection |

#### Example usage of steal

<code>`{steal(,)}`</code>

### tag_apply

Shows a big button; clicking this button will apply certain tags onto the feature.

The first argument takes a specification of which tags to add.
These can either be a tag to add, such as `amenity=fast_food` or can use a substitution, e.g. `addr:housenumber=$number`.
This new point will then have the tags `amenity=fast_food` and `addr:housenumber` with the value that was saved in `number` in the original feature.

If a value to substitute is undefined, empty string will be used instead.

This supports multiple values, e.g. `ref=$source:geometry:type/$source:geometry:ref`

Remark that the syntax is slightly different then expected; it uses '$' to note a value to copy, followed by a name (matched with `[a-zA-Z0-9_:]*`). Sadly, delimiting with `{}` as these already mark the boundaries of the special rendering...

Note that these values can be prepare with javascript in the theme by using a [calculatedTag](calculatedTags.md#calculating-tags-with-javascript)
 

| name | default | description |
-----|-----|----- |
| tags_to_apply | _undefined_ | A specification of the tags to apply. This is either hardcoded in the layer or the `$name` of a property containing the tags to apply. If redirected and the value of the linked property starts with `{`, the other property will be interpreted as a json object |
| message | _undefined_ | The text to show to the contributor |
| image | _undefined_ | An image to show to the contributor on the button |
| id_of_object_to_apply_this_one | _undefined_ | If specified, applies the the tags onto _another_ object. The id will be read from properties[id_of_object_to_apply_this_one] of the selected object. The tags are still calculated based on the tags of the _selected_ element |
| maproulette_id | _undefined_ | If specified, this maproulette-challenge will be closed when the tags are applied. This should be the ID of the task, _not_ the task_id. |

#### Example usage of tag_apply

<code>`{tag_apply(survey_date=$_now:date, Surveyed today!)}`, `{tag_apply(addr:street=$addr:street, Apply the address, apply_icon.svg, _closest_osm_id)</code>

### tags

Shows a (json of) tags in a human-readable way + links to the wiki

| name | default | description |
-----|-----|----- |
| key | value | The key to look for the tags |

#### Example usage of tags

<code>`{tags(value)}`</code>

### title

Shows the title of the popup. Useful for some cases, e.g. 'What is phone number of {title()}?'

#### Example usage of title

<code>`What is the phone number of {title()}`, which might automatically become `What is the phone number of XYZ`.</code>

### translated

If the given key can be interpreted as a JSON, only show the key containing the current language (or 'en'). This specialRendering is meant to be used by MapComplete studio and is not useful in map themes

| name | default | description |
-----|-----|----- |
| key | value | The attribute to interpret as json |

#### Example usage of translated

<code>`{translated(value)}`</code>

### upload_to_osm

Uploads the GPS-history as GPX to OpenStreetMap.org; clears the history afterwards. The actual feature is ignored.

#### Example usage of upload_to_osm

<code>`{upload_to_osm()}`</code>

### visualize_note_comments

Visualises the comments for notes

| name | default | description |
-----|-----|----- |
| commentsKey | comments | The property name of the comments, which should be stringified json |
| start | 0 | Drop the first 'start' comments |

#### Example usage of visualize_note_comments

<code>`{visualize_note_comments(comments,0)}`</code>

### wikidata_label

Shows the label of the corresponding wikidata-item

| name | default | description |
-----|-----|----- |
| keyToShowWikidataFor | wikidata | Use the wikidata entry from this key to show the label |

#### Example usage of wikidata_label

<code>`{wikidata_label()}` is a basic example, `{wikipedia(name:etymology:wikidata)}` to show the label itself</code>

### wikipedia

A box showing the corresponding wikipedia article(s) - based on the **wikidata** tag.

| name | default | description |
-----|-----|----- |
| keyToShowWikipediaFor | wikidata;wikipedia | Use the wikidata entry from this key to show the wikipedia article for. Multiple keys can be given (separated by ';'), in which case the first matching value is used |

#### Example usage of wikipedia

<code>`{wikipedia()}` is a basic example, `{wikipedia(name:etymology:wikidata)}` to show the wikipedia page of whom the feature was named after. Also remember that these can be styled, e.g. `{wikipedia():max-height: 10rem}` to limit the height</code>


This document is autogenerated from [src/UI/SpecialVisualizations.ts](https://github.com/pietervdvn/MapComplete/blob/develop/src/UI/SpecialVisualizations.ts)