In the previous receipt about Drop-down list for values we learned how-to choice any component from Jira or project name from Gitlab.
On the next step we need in branch selector for choosen project.
Prerequisites:
- Active Choices plugin
- Gitlab token for API
Step 1: In job configuration add parameter Active Choice Reactive Parameter
Step 2: Set name for your parameter (for example GIT_BRANCH)
Step 3: Set value for Referenced parameters as COMPONENT
Step 4: Select Groovy script and add next groovy-code
import groovy.json.JsonSlurperClassic def projectName = COMPONENT def gitlabUrl = "https://gitlab.domain.org" def gitlabApiToken = "SecretToken" def per_page = 128 def url = "curl -k -H PRIVATE-TOKEN:${gitlabApiToken} ${gitlabUrl}/api/v4/projects?search=$projectName" def json = url.execute().text.replaceAll("\r\n", "") def data = new JsonSlurperClassic().parseText(json) def project = data.find { it.name == projectName } def projectId = project.id url = "curl -k -H PRIVATE-TOKEN:${gitlabApiToken} ${gitlabUrl}/api/v4/projects/${projectId}/repository/branches?per_page=${per_page}" json = url.execute().text.replaceAll("\r\n", "") data = new JsonSlurperClassic().parseText(json) def list = [] data.each { branch -> list += branch.name } return list 
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