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Note  For a description and a complete list of UI Objects, see UI Objects.

Works in combination with the data logger function to present a collection of data using time-based statistical charts. This object automatically adapts the graphical layout and size of the charts based on the overall object's size. The default presentation can be customized using several optional attributes. A datalogger can have a browser mode (if available server-side) for consulting past data. If a datalogger in browser mode isn't visible for more than a minute, it automatically resets to live mode.

UI Object datalogger.1.pngUI Object datalogger.2.pngUI Object datalogger.3.png


  • id: the object's ID, used by UISets. Optional
  • loggerID: the datalogger ID (or comma-separated list of multiple IDs)
  • position: the object's position. Use the pixels or rows and columns coordinates format
  • size: the chart's area's width and height
  • unit: list of values axis labels. If the datalogger has slots, one unit for each slot. If there are multiple datalogger ids, one unit for each datalogger
  • attributes: list of UI attribute names and values defining the chart's aspect and data. Setting this parameter is the same as setting each UI attribute with a UISet


(datalogger[!<id>] <loggerID>; <pos>; <width>; <height>; <label>; <attributes>)


(datalogger!datalogger1 edl; x80y60; 820; 500; kWh; controls=toolbar)


There are 5 different options to display data, which correspond to five possible values of the type attribute.

UI Object datalogger.bars.png
UI Object datalogger.points.png
UI Object datalogger.line.png
UI Object datalogger.spline.png


The pie type is particularly useful to compare multiple dataloggers.

The optional pielegendposition attribute determines the legend position relative to the pie chart.

UI Object datalogger.pie.1.png
type="pie" (with pielegendposition="right")
UI Object datalogger.pie.2.png


In browser mode, it is possible to display a high definition version of the current resolution, which selects and displays values from the next resolution available. For example when HD is active, the "month" resolution will display all the data from the "day" resolution, so it will show 744 (31*24) values instead of 31. HD is displayed only when available (if the next resolution data is available and not consolidated).

HD is controlled by the hd attribute, which can be either "true"/"false" or "toggle" which will show an icon and let the user control it.

UI Object datalogger.4.pngUI Object datalogger.5.png

Multiple Dataloggers

The Datalogger object can be configured to show multiple dataloggers at once. The loggerID parameter (or loggerid attribute) can contain a list of IDs of visible dataloggers.

To give the user the option to select which dataloggers to show, the list attribute can be used. If a list is set, a drop down menu will appear in the top left of the toolbar (which is visible only if controls is set to toolbar). The names attribute allows to associate a name to each datalogger of the list (or each datalogger specified in loggerid, if the list is empty).

UI Object datalogger.6.png

By default, all dataloggers are merged on the same scale. The multirange attribute allows each datalogger to have its own range, with its scale shown on the left of the chart.

UI Object datalogger.7.png

The rangegroups attribute allows dataloggers to be grouped to a common range.

UI Object datalogger.8.png

The valuecolor[n] attribute (where n is an index starting from 1) changes the value color of a specific datalogger.

In a datalogger with type range, the value is used for average, while colors for maximum and minimum are automatically calculated by changing the brightness. Use only colors in rgb or hex formats.

Note  To avoid strange behaviors when displaying multiple dataloggers, it's better to choose dataloggers that have common properties (such as origin, range, consolidation).


The datalogger object has a fullscreen mode, that can be toggled by clicking the fullscreen icon, or by setting the value of the "fullscreen" UI Attribute.

The fullscreen mode will hide any other object and scale the datalogger to cover the whole screen.

If the URL query "fullwindow" is present, the datalogger will just expand inside the browser's window instead of actually going fullscreen.

UI Attributes

Common attributes

Name Value Description
pos x<x>y<y> Position specified as x/y coordinates. E.g. x-5y10
visible true Default. Show the object
false Hide the object
blink true | slow Blink the object at a slow speed
fast Blink the object at a fast speed
false Stop the blinking
opacity 0.0 ... 1.0 Object opacity from 0 (not visible) to 1 (fully visible)
rotation 0 ... 360 Object rotation in degrees. Images are rotated around the center point, all other objects are rotated around the top left corner

Datalogger attributes

Name Value Description
avgvalues true Show average values, if in range mode
false Hide average values
axiscolor <CSS color> Axis color
browserdate date and time, in the "yyyymmddhh" format Set the browser date and time. These formats will also be accepted: "yyyy", "yyyymm", "yyyymmdd"
browserscale 10y Set the live scale to 10 years
year Set the browser scale to year
month Set the browser scale to month
day Set the browser scale to day
hour Set the browser scale to hour
byday true Show daily data (hours)
false Hide daily data
byhour true Show hourly data (minutes)
false Hide hourly data
byminute true Show data by minute (seconds)
false Hide data by minute
bymonth true Show monthly data (days)
false Hide monthly data
controls tabs Show tabs on live mode for scale and slots
toolbar Show a toolbar to control live and browser modes
none Don't show any controls
csvseparator <character> Specifies a character used to separate columns in the generated csv file. Rows are separated with the newline character.
download true Display a button in browser mode that downloads a CSV file with the currently displayed data
false Default. No download icon
drawaxis true Default. The axes are visible (also notches and labels)
false The axes are not visible (also notches and labels)
fullscreen true Enables fullscreen mode
false Disables fullscreen mode
group <value> Name of a group. Dataloggers with the same group are synchronized (controlling one affects the others)
hd true Enables HD
false Disables HD
toggle Shows an HD icon that lets the user toggle HD on and off
labelcolor <CSS color> Color of the axis and bars labels
legend true Show all legends
false Hide legends
<comma-separated list of values> List of legends (min, avg, max) to show
list <comma-separated list of datalogger IDs> List of IDs of dataloggers selectable by the user. Shows an icon in the control bar that displays the list
loggerid <comma-separated list of datalogger IDs> List of IDs, to change it dynamically
maxvalues true Show maximum values, if in range mode
false Hide maximum values
minvalues true Show minimum values, if in range mode
false Hide minimum values
mode live Live mode
browser Browser mode
multichart true Show multiple charts on live mode
false Show a single chart in live mode, based on the selected scale
multirange true For multiple datalogger ids only. Show multiple ranges for each datalogger id: each chart has multiple value axes.
false Default. Single range for each datalogger
names <comma-separated list of values> Sets the dataloggers names (relative to the list attribute or, if list is empty, the loggerid attribute), displayed in the legend, list popup and csv header
notchcolor <CSS color> Color of the axis notches
notches <value> Number of notches on the y-axis
panel true Show background panel
false Hide background panel
pastperiod true Show past period (only available for single datalogger id)
false Hide past period
pastvaluecolor <CSS color> A color that applies to all past values
<CSS color>,<CSS color>,<CSS color> Colors that apply respectively to minimum, average and maximum past values
pielegendposition top Default value. Applies to "pie" type, shows the legend on the top of the pie chart
right Applies to "pie" type, shows the legend on the right of the pie chart
pointsize number of pixels Point size (use for the points chart type)
presentvaluecolor <CSS color> A color that applies to all present values
<CSS color>,<CSS color>,<CSS color> Colors that apply respectively to minimum, average and maximum present values
rangegroups <comma-separated list of values> List of group names, one for each datalogger id (specified in list or in loggerid, if the list is empty). Dataloggers with the same group name are grouped together in a single range.
scale year Set the live scale to year
month Set the live scale to month
day Set the live scale to day
hour Set the live scale to hour
refreshinterval <number> Specifies the live refresh interval in seconds. Default is 5
slot <number> Show a specific slot, from 0 to the number of slots-1
stroke number of pixel Pixel size of the stroke that applies to line and spline chart's types
thresholdcolor <CSS color> Color of threshold lines. Not supported with multiple dataloggers with different scales/units.
thresholdcolors <comma-separated list of CSS colors> List of colors of threshold lines, one value each line. Not supported with multiple dataloggers with different scales/units.
thresholds <comma-separated list of values> List of values at which to display a line (threshold). Not supported with multiple dataloggers with different scales/units.
totals true Show totals
false Hide totals
type bars Draw bars
points Draws points
line Draws a line connecting the values
spline Draws a spline connecting the values
pie Draws a pie chart, each slice representing a datalogger (if multiple dataloggers are visible), or past/present values. Percentage is shown in the legend
units <comma-separated list of values> Units to display on the top left of each chart. If the datalogger has slots, one unit for each slot. If there are multiple datalogger ids, one unit for each datalogger
valuecolor[n] <CSS color> Available only with multiple dataloggers. Specifies the value color of the datalogger with index n (starting from 1). Accepted color formats: rgb and hex.
valuelabelcolor <CSS color> Value label's color
valuelabeltype inside Value labels are shown inside (if "type" is bars, points or gauge) or over (if "type" is line or spline)
outside Value labels are shown above or below
popup Value labels are shown on mouseover, or on touch (if on a touch-enabled device)
A CSS color can be specified as
  • hex value: #<rr><gg><bb> E.g. #FF1010
  • color name: red, blue, white...
  • as rgb: rgb(<r>,<g>,<b>) E.g. rgb(255,30,30)
  • as rgba: rgba(<r>,<g>,<b>,<alpha>) E.g. rgba(255,30,30,0.5)