CyberTracker XlsForm Reference Manual

Overview

CyberTracker is a universal data collection application which runs on mobile devices. One of the supported formats is XlsForm.

XlsForm has an extension mechanism which allows users to activate CyberTracker behavior without affecting the semantics of the form.

This reference manual descibes the CyberTracker extensions. Note that XlsForms are simply an Excel files and the extensions are columns in the worksheets.

There are three kinds of customization:

• Views, e.g. grid styles for single and multi-select lists
• Behaviors, e.g. GPS track logs and save targets
• Developer code, e.g. a new widget

Backend

CyberTracker supports ODK Central, KoBoToolbox and Survey123.

The CyberTracker extensions do not affect the semantics of the form and are transparent to backends. It is possible to use the same form to collect data across platforms (web, ODKCollect, etc) with a single form. In this scenario, CyberTracker would be chosen as a way to meet the needs of specific field workers.

Limitations

While CyberTracker supports most of the commonly used XlsForm features, it is not as mature as the existing data collection tools like ODK Collect, Kobo Collect and Survey123. Users should prefer to use those tools for mission critical projects.

Table of Contents

• Initial setup
  • namespace (required)
  • version (recommended)
• Settings
  • immersive
  • wizardMode
  • summaryText and summaryIcon
  • colors
  • icon, iconDark and subtitle
  • offlineMapUrl
  • locationServiceUrl
  • sendLocationInterval
  • submitInterval
• Header
  • color and colorDark
  • text
  • topText
  • button
  • homeIcon
  • cancelIcon
  • confirmIcon
  • hideHome
  • hidden
  • qml
  • qmlBase64
  • qmlFile
• Content
  • color and colorDark
  • frameWidth
  • style
  • padding
  • columns
  • lines
  • border
  • borderWidth
  • fontSize
  • fontBold
  • itemHeight
  • qml
  • qmlBase64
  • qmlFile
• Footer
  • buttons
  • home button
  • back button
  • next button
  • save button
  • nextOrSave button
  • index button
  • options button
  • map button
  • Custom button icons
  • color and colorDark
  • buttonColor and buttonColorDark
  • buttonScale
  • hidden
  • qml
  • qmlBase64
  • qmlFile
• Save
  • snapLocation
  • targets
  • track
• Offline maps
  • What is an offline map?
  • Packages
  • Package installation
  • Layer order and opacity
  • Sharing
  • Zoom to layer
  • Supported formats
  • WMS layers
• Miscellaneous
  • fixCount
  • track file format
• Developers
  • Introduction
  • Setup
  • Page layout
  • recordUid and fieldUid
  • Setting form values
• Frequently Asked Questions
  • Which backends support XlsForm?
  • Are CyberTracker extensions visible to other tools?

Initial setup

The following columns on the settings sheet are needed to begin using the CyberTracker extensions.

namespace (required)

The ct namespace tells other XlsForm tools to ignore columns starting with bind::ct:.

title	version	namespaces
My Form	2022101001	ct="http://cybertracker.org/xforms"
surveychoicessettings

version (recommended)

The version field is used to track form versions over time. While not strictly required, it is a best practice to keep this field up to date. The XlsForm specification recommends the convention of ‘yyyymmddrr’. For example, 2022021501 is the 1st revision from Feb 15th, 2022.

Settings

immersive

Setting this to yes causes the UI to use the wizard exclusively, i.e. there is no Home page. Default is no.

title	bind::ct:immersive
My Form	yes
surveychoicessettings

In the table below, the user context is always within a sighting and each page typically holds one question. Pressing the options button (highlighted in the first image) navigates to a new page which shows the current sighting on one tab and all sightings on the other. The user can edit previous sightings, but when editing is complete, the wizard will revert to the original sighting.

wizardMode

If the immersive column is missing or set to no, then the UI reverts to non-immersive mode. In this case, there is a Home page which shows all sightings. The user returns to this page after saving a sighting.

title	bind::ct:wizardMode
My Form	yes
surveychoicessettings

If wizardMode is set to no, then all questions show on a single page. This mode is recommended when wanting to show all sighting data at once and is the most conventional.

If wizardMode is set to yes, then each question will appear on its own page with Back and Next toolbar buttons to navigate between questions. The user will still return to the Home page between sightings. wizardMode appears on the Settings page as Page mode.

summaryText and summaryIcon

The summary attribute specifies which fields to use as the summary of a sighting on the Home page. For example:

type	name	label
text	f_initial_text	Initial note
select_one animal	f_animal	Animal
select_multiple behavior	f_behavior	Behavior
text	f_final_text	Final note
surveychoicessettings

The following setting will ensure that the summary text only uses the f_animal and f_behavior questions. Similarly, the summary icon will be taken from the f_animal question.

title	bind::ct:summaryText	bind::ct:summaryIcon
My Form	f_animal f_behavior	f_animal
surveychoicessettings

colors

The colors attribute specifies the color scheme used on the form. It follows the Material Design system:

title	bind::ct:colors.primary	bind::ct:colors.accent
My Form	#6200EE	green
surveychoicessettings

The following color fields are supported:

• primary & primaryDark
• accent & accentDark
• foreground & foregroundDark
• background & backgroundDark

Colors suffixed with ‘dark’ will be used when dark mode is activated. If dark colors are not provided, then ‘primary’ and ‘accent’ colors will be used, but ‘foreground’ and ‘background’ colors will be ignored.

Colors can also be provided as a JSON object:

title	bind::ct:colors
My Form	{ "primary": "#6200EE", "accent": "green" }
surveychoicessettings

icon, iconDark and subtitle

The icon attribute specifies the icon used to display the project. iconDark is optional and will used when dark mode is enabled.

The subtitle attribute specifies the text just below the form name.

title	bind::ct:icon	bind::ct:subtitle
My Form	gorilla.png	Custom subtitle
surveychoicessettings

The icon image should be added to the form as an attached media file. In KoBoToolbox, this is done under the form settings option:

offlineMapUrl

The offlineMapUrl attribute specifies a url to a downloadable zip file containing map layers. Offline maps can be added manually using the mobile app, but this provides a way to specify them with the form. The map will be downloaded, installed and updated as part of the form.

title	bind::ct:offlineMapUrl
My Form	https://cybertrackerwiki.org/assets/xlsform/offlinemap.zip
surveychoicessettings

See the section on Offline maps for more information.

locationServiceUrl

When using Survey123, CyberTracker supports uploading locations and tracks to a hosted feature service. In this case, the feature service is specified in the bind::ct:locationServiceUrl column:

title	bind::ct:locationServiceUrl
My Form	https://services6.arcgis.com/.../FeatureServer
surveychoicessettings

The feature service can be created using the CyberTracker Mobile application from the Settings page of a Survey123 project or using the Desktop Simulator (see Download page). There is an option off the Tools menu called Create ArcGIS location service. This tool will automatically create and configure a hosted service which is compatible with CyberTracker:

After clicking Start, the tool will display the following:

The feature service contains three layers: Tracks (point layer), Last Known Locations (point layer) and Track Lines (Polyline layer).

If this service is not specified, then tracks are placed in a file type question of the sighting. See Tracks.

sendLocationInterval

If using Survey123, CyberTracker can send the current location at regular intervals - separately from tracks. The value is in seconds and is user configurable via the form Settings page on the device. This specifies the default value. bind::ct:locationServiceUrl must be configured.

title	bind::ct:sendLocationInterval
My Form	30
surveychoicessettings

submitInterval

Auto-submit at a timer interval. The value is in seconds and is user configurable via the form Settings page on the device. It is equivalent to manually pressing the Submit button. The default value is 0 meaning auto-submission is disabled. A value of 1 means that submit is combined with the save operation.

title	bind::ct:submitInterval
My Form	300
surveychoicessettings

Header

The header object supports custom header attributes. If no header object is specified, then the default header is used. By default, the header title is taken from the question label.

color and colorDark

By default, the header background color is taken from the settings sheet. However, it is possible to override it on an individual page.

type	bind::ct:header.color	bind::ct:header.colorDark
select_one...	#ff0000	#800000
surveychoicessettings

text

Custom header text.

type	name	bind::ct:header.text
select_one animal	Animal	Custom question text
surveychoicessettings

topText

Custom smaller text above main title.

type	name	bind::ct:header.topText
select_one animal	animal	Custom top text
surveychoicessettings

button

Type of the button in the top-right corner. Valid values are:

• empty - by default no button is shown
• track - the current state of the GPS track system
• battery - the current state and level of the battery

type	name	bind::ct:header.button
select_one animal	animal	track
surveychoicessettings

Tapping on the button will provide more information, e.g. the track frequency or the battery level.

homeIcon

Override the home icon with a custom icon.

type	name	bind::ct:header.homeIcon
select_one animal	animal	my_home_icon.svg
surveychoicessettings

cancelIcon

When editing a sighting in immersive mode, the system puts a Cancel button in the top left corner. Clicking this button will discard any edits. This property overrides the default icon used.

type	name	bind::ct:header.cancelIcon
select_one animal	animal	my_edit_cancel_icon.svg
surveychoicessettings

confirmIcon

When editing a sighting in immersive mode, the system puts a Confirm button in the top right corner. Clicking this button will accept edits made to the sighting. This property overrides the default icon used.

type	name	bind::ct:header.confirmIcon
select_one animal	animal	my_edit_confirm_icon.svg
surveychoicessettings

hideHome

If yes then the home button is hidden. Default is no.

type	name	bind::ct:header.hideHome
select_one animal	animal	yes
surveychoicessettings

hidden

If yes then the header is hidden. Default is no.

type	name	bind::ct:header.hidden
select_one animal	animal	no
surveychoicessettings

qml

A QML fragment to use instead of the built-in header. See Developer section. For example:

type	name	bind::ct:header.qml
select_one animal	animal	qml fragment
surveychoicessettings

To set the header to a blue rectangle, replace qml fragment above with the following:

import QtQuick 2.15

Rectangle {
    color: "blue"
    height: 64
}

qmlBase64

Base64 encoded QML (see qml above).

qmlFile

Name of a QML file which exists alongside other project files. This is not supported on ODK or KoBoToolbox, but can be used in Survey123.

Content

The content section is the middle part of the screen between the header and footer. By default it automatically selects a control for the question type, e.g. a date selector for a date question. By specifying a custom content object, more styles are available. This is especially useful for customizing lists.

color and colorDark

By default, the content background color is taken from the settings sheet. However, it is possible to override it on an individual page.

type	bind::ct:content.color	bind::ct:content.colorDark
select_one...	#a0b0c0	#102030
surveychoicessettings

frameWidth

Frame width around the content area of the page. Default is 16.

type	name	bind::ct:content.frameWidth
select_one animal	animal	0
surveychoicessettings

In this case, frameWidth was set to 0 in the second image.

style

The visual appearance of the question.

type	name	bind::ct:content.style
select_one animal	animal	IconOnly
surveychoicessettings

For select_one questions

• (not specified)
• IconOnly
• TextOnly
• TextBesideIcon
• TextUnderIcon

For select_multiple questions:

• (not specified)
• IconInlay
• IconOnly
• TextOnly
• TextBesideIcon

For number list groups:

• (not specified)
• IconOnly
• TextOnly
• TextBesideIcon

Number lists are a set of questions inside a group. The appearance column must be set to field-list to force all group questions to appear on the same page:

type	name	label	bind::ct:content.style	appearance
begin group	numberlist	Number list	IconOnly	field-list
integer	number1	Number 1
integer	number2	Number 2
integer	number3	Number 3
integer	number4	Number 3
integer	number5	Number 5
end group
surveychoicessettings

For range questions:

type	name	parameters	bind::ct:content.style	bind::ct:content.columns
range	animal_count	start=1 end=100 step=1	Grid	5
surveychoicessettings

For a fixed number of image questions:

type	name	label	bind::ct:content.style	appearance
begin group	photogroup	Group photos	Grid	field-list
image	image1	Photo
image	image2	Photo 2
image	image3	Photo 3
image	image4	Photo 4
end group
surveychoicessettings

For a dynamic number of image questions:

type	name	label	bind::ct:content.style
begin repeat	photogroup	Repeat photos	Grid
image	image	Photo
end repeat
surveychoicessettings

Ignored for other question types.

padding

The padding space between grid items. Requires style to be set.

type	name	bind::ct:content.padding
select_one animal	animal	8
surveychoicessettings

Padding values are 0, 4 and 8.

columns

Number of columns for grids. Requires style to be set. Defaults to 2.

type	name	bind::ct:content.style	bind::ct:content.columns
select_one animal	animal	Grid	4
surveychoicessettings

For example, column values below are 3, 5 and 10.

lines

Show lines between cells for grids. Requires style to be set. Defaults to true.

type	name	bind::ct:content.style	bind::ct:content.lines
select_one animal	animal	IconOnly	no
surveychoicessettings

lines value below is yes and no.

border

Show border around the outside of a grid. Requires style to be set. Defaults to no if frameWidth is 0, yes otherwise.

type	name	bind::ct:content.style	bind::ct:content.border
select_one animal	animal	IconOnly	yes
surveychoicessettings

Border value is yes and no.

borderWidth

Border width for grid lines. Requires style to be set. Defaults to 2.

type	name	bind::ct:content.style	bind::ct:content.borderWidth
select_one animal	animal	IconOnly	2
surveychoicessettings

borderWidth value is 2 and 4.

fontSize

Size text font size. Requires style to be set. Defaults to 16. Note that the font is subject to scaling according to the Font size in the main Settings page.

type	name	bind::ct:content.style	bind::ct:content.fontSize
select_one animal	animal	IconOnly	14
surveychoicessettings

fontSize values are 10, 14 and 18.

fontBold

Set font to bold. Requires style to be set. Defaults to false.

type	name	bind::ct:content.style	bind::ct:content.fontBold
select_one animal	animal	IconOnly	yes
surveychoicessettings

itemHeight

Set height of individual items. Requires style to be set. Defaults to 48.

type	name	bind::ct:content.style	bind::ct:content.itemHeight
select_one animal	animal	IconOnly	48
surveychoicessettings

itemHeight values are 48, 64 and 128.

qml

A QML fragment to use instead of the built-in content. See Developer section. For example:

type	name	bind::ct:content.qml
integer	animal_count	qml fragment
surveychoicessettings

To set the content to a blue rectangle, replace qml fragment above with the following:

import QtQuick 2.15
import QtQuick.Controls 2.15

Rectangle {
    color: "blue"
    Button {
        anchors.centerIn: parent
        text: "Click me"
        onClicked: parent.color = "red"
    }
}

In the example, the content is blue, then changes to red when the button is clicked.

qmlBase64

Base64 encoded QML (see qml above).

qmlFile

Name of a QML file which exists alongside other project files. This is not supported on ODK or KoBoToolbox, but can be used in Survey123.

Footer

The footer object supports custom control buttons, e.g. home, back, next, save, etc. If no footer object is specified, then the default control is used.

buttons

buttons is text which specifies which buttons should be shown on the footer toolbar.

type	name	bind::ct:footer.buttons
select_one	animal	back next index save map
surveychoicessettings

home button

The home button returns to the Home page. In immersive mode, this returns to the Projects page, otherwise it returns to the project home page.

back button

The back button navigates to the prior question on the form. If the wizard is at the start of the form, the back button is hidden.

next button

The next button navigates to the next question on the form. If there is no next question, then the next button is hidden.

save button

The save button will attempt to save the current sighting. If the sighting has invalid data, then the Index page will be shown with invalid fields highlighted.

nextOrSave button

The nextOrSave button will show as a next button unless there are no more questions, in which case it will become a save button.

index button

The index button displays a list of all the form questions. Selecting a question will navigate the wizard to it directly. A jump-to-last button on the top right of the header will jump to the next required question. If all required questions are filled in, then it jumps to the last question.

options button

The options button is only available in immersive mode. In non-immersive mode, it becomes the index button (see above).

The options button shows an options page with two tabs: current sighting and saved sightings:

map button

The map button opens the map dialog.

Custom button icons

The button icons can be overridden with custom ones. To do this, create columns with the name of the button followed by Icon. For example:

• homeIcon
• backIcon
• nextIcon
• saveIcon
• indexIcon
• optionsIcon
• mapIcon

type	name	bind::ct:footer.mapIcon
select_one	animal	my_custom_map_icon.svg
surveychoicessettings

color and colorDark

By default, the footer background color is taken from the settings sheet. However, it is possible to override it on an individual page.

type	bind::ct:footer.color	bind::ct:footer.colorDark
select_one...	#0000ff	#000080
surveychoicessettings

buttonColor and buttonColorDark

Override the default button color with a custom one. This applies to all buttons.

type	bind::ct:footer.buttonColor	bind::ct:footer.buttonColorDark
select_one...	#00a000	#20f020
surveychoicessettings

buttonScale

An additional scaling factor to apply to the button size. This is typically useful for increasing the size of footer buttons. The scaling factor will be capped to allow at least 6 buttons to fit in the footer.

type	bind::ct:footer.buttonScale
select_one...	3.5
surveychoicessettings

hidden

If yes then the footer is hidden. Default is no.

type	name	bind::ct:footer.hidden
select_one animal	animal	no
surveychoicessettings

qml

A QML fragment to use instead of the built-in footer. See Developer section. For example:

type	name	bind::ct:footer.qml
integer	animal_count	qml fragment
surveychoicessettings

To set the footer to a blue rectangle, replace qml fragment above with the following:

import QtQuick 2.15

Rectangle {
    color: "blue"
    height: 64
}

qmlBase64

Base64 encoded QML (see qml above).

qmlFile

Name of a QML file which exists alongside other project files. This is not supported on ODK or KoBoToolbox, but can be used in Survey123.

Save

When the user presses the Save button, this triggers the save behavior.

snapLocation

Setting snapLocation to the name of a geopoint question will create a popup to acquire the GPS location. This feature is only active when wizardMode is enabled.

type	name	label
geopoint	f_location	Location
select_one animal	f_animal	Animal
text	f_note	Note
surveychoicessettings

title	bind::ct:save.snapLocation
My form	f_location
surveychoicessettings

In this example, the user flow will be:

targets

In the example below, the user will be presented with a popup containing the choices Restart or Another. After the sighting is saved, a new sighting will be created starting at the targeted question. All prior question data will be replicated into the new sighting.

This value must be a valid JSON array.

type	name	label
select_one animal	f_animal	Animal
select_multiple behavior	f_behavior	Behavior
text	f_note	Note
surveychoicessettings

restart and another are taken from the choices sheet in the saveTargets list name.

list_name	name	label
saveTarget	restart	Restart
saveTarget	another	Another
surveychoicessettings

Note that question is the name of the targeted question in the survey table. If the question is not relevant, then this choice will be hidden.

title	bind::ct:save.targets
My form	[{ "choice": "restart", "question": "f_animal"}, { "choice": "another", "question": "f_behavior"}]
surveychoicessettings

Note that if immersive is set to false, then the target list will automatically contain the home button. This option will save and return to the Home page without automatically creating a new sighting.

track

In the example below, there is a select_one question called f_track with choices start, stop and nochange. When the user presses Save, the track timer is adjusted depending on which choice was selected. The values in updateIntervalSeconds and distanceFilterMeters are the new track settings.

This value must be a valid JSON array.

type	name	label	appearance
file	f_track_file	Track file	hidden
select_one track_items	f_track	Configure track
text	f_note	Note
surveychoicessettings

list_name	name	label
track_items	start	Start
track_items	stop	Stop
track_items	nochange	No change
surveychoicessettings

title	bind::ct:save.trackFile	bind::ct:save.track
My form	f_track_file	[{ "condition": "selected(${f_track}, 'start')", "updateIntervalSeconds": 5, "distanceFilterMeters": 10 }, { "condition": "selected(${f_track},'stop')", "updateIntervalSeconds": 0, "snapTrack": true }]
surveychoicessettings

condition is an XlsForm expression which activates this option if matched, e.g. ${start_stop}=’start’. Check out the ODK Form Logic documentation.

updateIntervalSeconds is the number of seconds between GPS readings. Set to 0 to disable the track timer.

distanceFilterMeters is the minimum distance between readings in meters. This is optional and by default no distance filter is used.

snapTrack causes the system to snapshot all the track points (since prior snap).

If using Survey123 and locationServiceUrl is specified, then the track data will be sent to the feature service. Otherwise, a track file will be created and added to a file type question in the form. See the section on the track file here.

Offline maps

What is an offline map?

Offline maps are map layers that are installed in CyberTracker. They can be used on the Map page. With the exception of WMS layers, they do not require a network connection.

Packages

An offline map package is a zip file containing one or more layer files. See this sample file. Note that the layers.json file is optional - by default the system will automatically discover files with supported extensions. Many map layers require several files with the same base name, for example shape files require a .shp, .shx, .dbf and .prj file. These should all be in the base directory of the zip file.

Package installation

On desktop, a map package can be installed using Install package from the File menu.

On mobile, maps can also be installed directly from the Offline maps page. This can be reached via Settings or the gear icon on the Map Layers page:

Layer order and opacity

CyberTracker will discover and install layers in a zip file automatically. While this is often acceptable, when there are multiple layers, it is useful to specify the order and opacity of each. To do this, add a layers.json file to the zip and specify each of the layers:

[
    {
        "filename": "Gabon.mbtiles",
        "name": "Gabon",
        "active": true,
        "opacity": 1.0
    },
    {
        "filename": "Country.shp",
        "name": "World countries",
        "active": true,
        "opacity": 0.5
    }
]

Note that the Settings page for offline maps also supports re-ordering the layers, sharing with others and even deleting them:

Sharing

Offline map packages can be shared to other devices. This shares the entire original package, not just the selected layer.

Zoom to layer

On the Map Layers page, selecting the Zoom to button will zoom to the entire extent of the layer.

Supported formats

The following layer formats are supported:

• ESRI formats: shapefile (shp), tile package (tpk), vector tiles package (vtpk)
• ASRP/USRP
• CIB1, 5, 10
• DTED0, 1, 2
• GeoTIFF
• HFA
• HRE
• IMG
• JPEG
• JPEG 2000
• NITF
• PNG
• RPF
• SRTM1, 2
• Mosaic Dataset in SQLite (read-only)
• MapBox: mbtiles
• Google: KML
• GeoJSON

WMS layers

Web Map Service is an online layer protocol. While these layers are actually online, they can be added as layers using the Offline map system. To do this, create a JSON file with the extension .wms and add it to the package zip file. For example:

{
    "layer": "0",
    "service": "https://basemap.nationalmap.gov/arcgis/services/USGSHydroCached/MapServer/WMSServer"
}

Miscellaneous

fixCount

For geopoint question types, the number of skipped readings before a fix is taken. The default value is 4. Some GPS devices return old readings before real readings. To overcome this, setting the fixCount will cause the system to require several readings before the final location is taken.

type	name	parameters
geopoint	f_location	fixCount=4
surveychoicessettings

track file format

When the user presses Save and creates a track file, it is stored in a file field specified in the settings sheet in the bind::ct:save.trackFile column.

By default the format of the track is zipped geojson, but this can be changed by using the format parameter of the question itself. Supported values are geojson and kmz (not supported on Survey123).

Survey123 users should prefer to use a location service - see locationServiceUrl. If a location service is specified, this question should be removed.

type	name	appearance	parameters
file	f_track_file	hidden	format=kmz
surveychoicessettings

title	bind::ct:save.trackFile
My form	f_track_file
surveychoicessettings

Developers

Introduction

CyberTracker is built on the Qt Framework. The Qt user-interface language is called QML and it provides a concise way to describe components and layouts. The scripting language is Javascript.

QML fragments can be added to an XlsForm. This enables a high degree of customization beyond what is already available. In particular it allows custom widgets and layouts to be used in data entry.

Setup

Install CyberTracker on your desktop computer by following the instructions on the Download page.

After launching, open the Window menu and select Toggle developer console.

Page layout

Each question in an XlsForm is given one page in the UI. The page is divided into 3 segments: header, content and footer:

Each can host QML and these are specified in the bind::ct:header.qml, bind::ct:content.qml and bind::ct:footer.qml columns. Note that you may also use qmlFile (file alongside project files) or qmlBase64 (base64 encoded QML).

recordUid and fieldUid

XlsForm question values are identified by their recordUid and fieldUid.

recordUid uniquely identifies the current record. For simple forms there is only record per sighting, but using repeats and groups, multiple records will be created.

fieldUid uniquely identifies the question within a form. It comes from the name column of the survey sheet.

Given the following form:

type	name	label	bind::ct:content.qmlFile
text	my_field_name	My field name	test.qml
surveychoicessettings

And the following test.qml:

import QtQuick 2.15

Item {
    property string recordUid
    property string fieldUid

    Component.onCompleted: {
        console.log("recordUid = " + recordUid)
        console.log("fieldUid = " + fieldUid)
    }
}

The developer console will output something like:

recordUid = 7f1ed933401b43878fee6f0d38c7f92a
fieldUid = my_field_name

Setting form values

Form values can be changed using a FieldBinding component. This enables change notifications so that the Label will automatically update when the button is clicked.

import QtQuick 2.15
import QtQuick.Controls 2.15
import CyberTracker 1.0 as C

Item {
    property alias recordUid: fieldBinding.recordUid
    property alias fieldUid: fieldBinding.fieldUid

    C.FieldBinding {
        id: fieldBinding
    }

    Label {
        x: 10
        y: 10
        text: fieldBinding.value
    }

    Button {
        anchors.centerIn: parent
        text: "Set field value"
        onClicked: {
            fieldBinding.setValue("Hello world!")
        }
    }
}

The console window will give an error of the form: Unable to assign [undefined] to QString when first launched, because fieldBinding.value is initially undefined. This is generally harmless, but can be removed by checking for undefined:

Label {
    x: 10
    y: 10
    text: fieldBinding.value || ""
}

Frequently Asked Questions

Which backends support XlsForm?

CyberTracker supports ODK Central, KoBoToolbox and Survey123.

Are CyberTracker extensions visible to other tools?

XlsForm extensions support custom columns by using the namespaces value in the settings sheet. Columns prefixed with bind::ct: are only used by CyberTracker and are ignored (but preserved) by other tools.