Reassign a user task | Change Assignee

Camunda 7 Topics Discussion & Questions
1

Hello everybody,
I would like to change the assignee of a user task.
The following conditions are given.
User A gets assigned to the Usertask1 (“Fehler lösen”) . User A knows that User B has to fulfill the Usertask1, so User A should assign UserB to this Task.
Changing the Assgnee with the assigneefield on the top of the Form is no Option, cause nobody Knows all the Usernames and I dont want to grant the user authorization to change fields at the Top.
My Idea is to Create an dropdown field in the form where User A can choose the new assignee.
If this field is not null, there will be a service Task which changes the variable which is for the assignee.

The problem in conclusion my way doesnt Work.
Does anybody know a good way to handle?

2022-07-13 12_43_54-Camunda Modeler

Best regards!

2

Hey @photowinget,

Could you share your diagram and your code? Could you define a little bit more in detail what “does not work” mean? Do you get an error, or is it just not assigning the new person?

Kind regards
Nele

3

Hello Nele,
thanks for your response. I try to explain my situation better.

My target is to get a dropdown box which lists the possible users after that i would like to update the User Task and assign the new user to the task

I tried different solutions.
First I tried to add a tasklistener at the update Event with the following Code and Diagramm (first_try.bpmn)
first_try.bpmn (3.7 KB)
I didn’t get an error but i can’t submit the Form anymore.

task.setAssignee(task.getVariable('newassignee'));

The second try was to create set the variable newassigne to assigne during a servicetask and update the assignee from the User task with an execution listener at start event.
second_try.bpmn (5.8 KB)
Then i got this error:
Cannot instantiate process definition UserAssign_Test:6:a2f402d6-0379-11ed-8fdc-00155d1e728a: Unable to evaluate script while executing activity ‘Activity_03g2wgr1’ in the process definition with id ‘UserAssign_Test:6:a2f402d6-0379-11ed-8fdc-00155d1e728a’:ReferenceError: “assignee” is not defined in at line number 1

Is there a generel recommend way to change the assignee of an existing user task?

4

Hello everyone
Does anyone know if it is possible to change the assignment of a user task with the rest of the service? Is it possible to call the rest service from an embedded form? I don’t know Javascript and cam-script that well? Does anyone know a solution? I am grateful for any help!

5

Hi @photowinget,

you can use this REST Api to set the assignee of a user task: Set Assignee | docs.camunda.org.

Hope this helps, Ingo

6

Hello Ingo,
thanks for your response. I tried your solution, but now my tasks only gets unclaimed. The newassignee doesn’t get assigned. Do you have an idea whats my issue?
Thanks a lot!

<form>
  <div class="form-group">
    <label class="control-label col-md-4" for="newassignee">Neuzuweisung an:</label>
    <div class="controls">
      <select cam-variable-name="newassignee" cam-variable-type="String" class="form-control" id="newassignee">
        <option>---</option>
        <option>user1</option>
        <option>user2</option>
        <option>user3</option>
        <option>user4</option>
      </select>
    </div>
  </div>

  <script cam-script type="text/form-script">
  inject(['$http', 'Uri', function($http, Uri) {
  camForm.on('variables-stored', function() {
        var Taskid = camForm.taskId;
        var variableManager = camForm.variableManager;
        var newassignee = variableManager.variableValue('newassignee');
        if(newassignee === '---')
        {
          alert("keine neuzuweisung");
        }
        else
        {
          alert("Der Task: " + Taskid +" wurde dem Benutzer: " + newassignee +" zugewiesen.");
          $http.post(Uri.appUri('http://hostname:8080/engine-rest/task/' + Taskid + '/assignee'), { headers: { 'Content-Type': "application/json;charset=utf-8"},body: 'userId': newassignee } );
        }
    });
}]);
</script>


</form>
7