I'm building a Workspace add-on using the JSON Card API (i.e. not via Apps Script. I couldn't find a SO tag for this): https://developers.google.com/workspace/add-ons/reference/rpc/google.apps.card.v1 .
Forms elements are declared with the SelectionInput object :
I want the form to be sent only by clicking on a "Send" button.
How is form submission handled when onChangeAction is not specified ? I see "If specified, the form is submitted when the selection changes. If not specified, you must specify a separate button.", but what if the Card has more than one button ? The documentation and the API don't seem to account for this.
CodePudding user response：
The answer seems to be : all button clicks implicitly send all form data inside the commonEventObject.formInputs field of the JSON request body.
For instance, if we have a form named form_test with radio buttons having values 1, 2, 3 and select the first one, formInputs will be :
{"form_test":{"stringInputs":{"value":["1"]}}}
Thank you Google for not documenting the semantics of your APIs!