Howto: Drop-down list for values in Jenkins

How to create drop-down list in Jenkins with predefined items.

Prerequisites:

• Extended choice parameter plugin

Step 1: create in Global properties at http://jenkins.domain.org/configure property with name PROJECTS and comma-separated list of your projects

Step 2: In job configuration add parameter Extended choice parameter
Set name for your parameter (for example JIRA_PROJECT)
Select Groovy script and add next groovy-code

    import jenkins.model.*
    nodes = Jenkins.instance.globalNodeProperties
    nodes.getAll(hudson.slaves.EnvironmentVariablesNodeProperty.class)
    envVars = nodes[0].envVars
    return "${envVars['PROJECTS']}".split(',')

Step 3: Enjoy!