active choice

Jenkinsfile

@@ -1,11 +1,16 @@
 properties([parameters([[$class: 'DynamicReferenceParameter', choiceType: 'ET_FORMATTED_HTML', name: 'General', omitValueField: false, randomName: 'choice-parameter-517572555514769', referencedParameters: '', script: [$class: 'GroovyScript', fallbackScript: [classpath: [], oldScript: '', sandbox: false, script: ''], script: [classpath: [], oldScript: '', sandbox: true, 
 script: '''
-def verCode = UUID.randomUUID().toString()
-test="hallo"
+def generator = { String alphabet, int n ->
+  new Random().with {
+    (1..n).collect { alphabet[ nextInt( alphabet.length() ) ] }.join()
+  }
+}
+randomValue = generator( (('A'..'Z')+('0'..'9')+('a'..'z')).join(), 9 )
+
 vappHtml = """
 <ul style="list-style-type: none">
     <li style="padding: 5px">
-    <label>${verCode}</label>
+    <label>${randomValue}</label>
     <input type="text" class="jenkins-input" name="value">
   </li>
 </ul>