Checkbox in a Camunda 8 connector template

Camunda 8 Topics Discussion & Questions
6

It should appear as an input variable? If checked then it is true, if not checked then it is false?

In this case you want an input mapping (zeebe:input), because that is what will bind to a variable at run-time. However binding zeebe:input to Boolean / checkbox is currently not supported (Support Boolean conditions in templates · Issue #768 · bpmn-io/bpmn-js-properties-panel · GitHub).

Cf.

{
  "$schema": "https://unpkg.com/@camunda/zeebe-element-templates-json-schema/resources/schema.json",
  "name": "BooleanBindingTemplate",
  "id": "boolean-binding-template",
  "version": 1,
  "description": "Configure boolean value for input binding",
  "category": {
    "id": "connectors",
    "name": "Connectors"
  },
  "appliesTo": [
    "bpmn:Task"
  ],
  "elementType": {
    "value": "bpmn:ServiceTask"
  },
  "properties": [
    {
      "type": "Boolean",
      "value": "= true",
      "binding": {
        "type": "zeebe:input",
        "name": "someVariable"
      }
    }
  ]
}

To validate the direction we’d like to pursue as we pick up this topic:

  • We want to allow you to bind any value if the user checked the box and provide no binding if they did not.
  • That allows us to support a large amount of use cases, including but not limited to binding basic boolean (true or not defined), expressions (set discountedPrice to = 0.9*price if discount is desired), but also static values (SOME_STATIC_STRING).
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