JS script uses old Item value

Setup, Configuration and Use Scripts & Rules
1

I’ve got this rule:

version: 1
rules:
  haarden-onverwachte-doving:
    label: Haarden - Onverwachte afkoeling
    description: Soms gaan de haarden onverwacht uit. Dit kan misschien opgemerkt worden middels de temperatuurssensors.
    triggers:
      - id: "1"
        config:
          itemName: haard_eetkamer_temperatuur
        type: ItemChanged
      - id: "2"
        config:
          itemName: haard_salon_temperatuur
        type: ItemChanged
    actions:
      - id: "3"
        config:
          type: JavaScript
          script: [see below]
        type: Script

const eventitemnaam = event.itemName;
const nieuwenumericstatusitem = items.getItem(eventitemnaam).numericState;
const oudenumericstatusitem = items.getItem(eventitemnaam).previousNumericState;

function main() {
  if (nieuwenumericstatusitem < oudenumericstatusitem && nieuwenumericstatusitem > 40) {
    const statusitemsuffix = "_gewenste_status";
    const haardprefix = eventitemnaam.split("_temperatuur")[0];
    const haardstatusitemstring = haardprefix + statusitemsuffix;
    const haardstatusitem = items.getItem(haardstatusitemstring);
    const haardstatus = haardstatusitem.boolState;
    if (haardstatus) {
      const melding = haardprefix + " is aan het afkoelen, maar " + haardstatusitemstring + " = " + haardstatus;
      rules.runRule("melding_gsm_DBE", { 'gsm': true, 'melding': melding });
      console.log(melding);
    }
  }
}

main();

Now see this chain of logging events:
events.log:

2026-11-07 14:46:52.484 [INFO ] [openhab.event.ItemStateChangedEvent  - 429       ] - Item 'haard_eetkamer_gewenste_status' changed from OFF to ON (source: org.openhab.core.autoupdate)
[...]
2026-11-07 14:47:35.515 [INFO ] [openhab.event.ItemStateChangedEvent  - 429       ] - Item 'haard_eetkamer_temperatuur' changed from 91.25 °C to 87 °C (source: org.openhab.core.thing$esphome:device:haard-eetkamer:temperatuur)

openhab.log:

2026-11-07 14:47:35.520 [INFO ] [ting.rule.haarden-onverwachte-doving - 41765     ] - haard_eetkamer is aan het afkoelen, maar haard_eetkamer_gewenste_status = true

Why does the script use a value of haard_eetkamer_gewenste_status that’s already been changed?

2

use event.state (or however it is done in js). Don’t get it from the item itself, because it may not have been updated when your event is triggered.

3

I wanted to do that, but then I get a string like 87 °C. It doesn’t look like there’s something like event.numericNewState and event.numericOldState…
Edit: it looks like parseFloat(event.newState); and parseFloat(event.oldState); will work.

But I think the problem is not that (nieuwenumericstatusitem < oudenumericstatusitem && nieuwenumericstatusitem > 40) was evaluated as true, but that (haardstatus) was. And that Item had received a new state 43 seconds before this rule was triggered.