openHAB widget - Component 'label' round decimal number


it’s my first attempt to create a widget with the new openHAB toolset and I’m using this widget from the community as template: Multi Sensor (Fibaro/Aeon/Philio/Aeotec) - Add-on Marketplace / UI Widgets - openHAB Community

The component “label” is responsible for displaying the value of an item:

  - component: Label
	  text: =items[(props.item2)].state + " Watt"
		font-size: 18px
		font-weight: 400

Is it possible to round a large decimal number here and if yes, how?
Thanks in advance!

In the widget code you have access to the js Math object and Number object. This gives you several different choices here. The easiest is probably just to parse the state string directly into an integer:

text: =Number.parseInt(items[(props.item2)].state) + " Watt"

That will always just truncate the string at the the decimal point (i.e., even 3.999 will become 3). If you would prefer actual up and down rounding of the number then you can use:

text: =Math.round(items[(props.item2)].state) + " Watt"

and if you would always like the number rounded up to the next higher integer:

text: =Math.ceil(items[(props.item2)].state) + " Watt"
1 Like

Great, thank you very much! Works as expected.