How can I use the Extended Choice Parameter plugin in a Jenkins pipeline script?

Question

The Extended Choice Parameter plugin is great and I use it in jobs configured via the UI https://wiki.jenkins-ci.org/display/JENKINS/Extended+Choice+Parameter+plugin

How

Answer 1

Use the below code to build multichoice checkbox parameter:

parameters {
  extendedChoice description: '', multiSelectDelimiter: ',', name: 'a', quoteValue: false, saveJSONParameterToFile: false, type: 'PT_CHECKBOX', value: 'a,b,c', visibleItemCount: 3
}

It looks like in Jenkins UI:

Use Declarative Directive Generator to generate various pipeline source code which uses Extended Choice Parameter plugin