Attribute Led Display

The widget evaluates a simple condition and displays a green LED when the condition is met, or a red LED when it is not.

Widget setting

It is possible to set the widget in the backend. The following image shows an example of a widget setting.

The widget takes the actual value of the selected device’s attribute. In this example, the attribute is double_scalar attribute from the sys/tg_test/1 device. The value is compared to a defined ‘Compare value’ using a relation. In this case, is more than. If the value matches the condition, the LED widget displays a LED based on the selected style, in this example it is orange.

It is possible to customize the widget settings from the inspector panel (in edit mode), as shown below:

Input value	Description
Device	Type in a device name (or * to list all devices)
Attribute	Once a device is selected, type in an attribute name (or * to list all available attributes)
Relation	Specify the type of relation. It could be: “is more than”, “is less than”, “is equal to”, “is more than or equal to”, “is less than or equal to”
Compare	Specify the target value (number or string)
True Color	Specify the color that the led assumes when the actual value matches the condition
False Color	Specify the color that the led assumes when the actual value doesn’t match the condition
Size of LED	The size of the LED. It is express in units
Text Size (in units)	The size of the text. It is express in units
Show Attribute Value	shows the actual value to the right of the LED when enabled
Show Device Name	Displays the tango database name when enabled
Attribute Display	Select the Label, Name, or None for the attribute
Align Text on Center	Aligns the text to the center when enabled
Align Value on Right	Aligns the value to the right when enabled
Custom CSS	Write custom CSS for the widget container. The syntax is the same as standard CSS used in HTML files