Developing the desired action using JavaScript.įor very simple rules, step 2 can also be replaced by simply setting the actions without coding, directly in the UI.Creating the rule in the OpenHAB 3 UI, giving it a name, and setting the triggers when the rule should be executed.We will now split the rule-creation process into two parts: All this is done in textual notation using the OpenHAB DSL. We give each rule a name, define one or more triggers, and specify the action that should be executed when the given trigger fires. In OpenHAB 2, this was a feature within the PaperUI, since OpenHAB 3, rules can be directly created and edited in the main UI. Since OpenHAB 2.4, it is possible to create rules using a graphical interface or using a scripting language like JavaScript or Groovy. But when computations with dates and timestamps, string manipulations, and API calls become necessary, it is often very annoying not having a “real” programming language. Within such a file, each rule has the following format: rule "name_of_the_rule" when then endįor very simple things, this way of creating rules is absolutely sufficient. Up to version 2, rules had to be created in *.rule files using a domain-specific language (DSL based on Xbased, similar to the language Xtend). Read here: Improved JavaScript-Rule Features in openHAB 3.2 Rules in OpenHAB 1 and 2 !!! In the recent December 2021 release (openHAB 3.2), the JavaScript commands changed.
In this article, you will learn the steps and commands to create powerful rules in OpenHAB 3 using the language JavaScript. OpenHAB 3 added a completely new rule engine, new scripting languages, and an interactive web interface to create rules. How to Create Rules in OpenHAB 3 using JavaScript / ECMAScript
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