Dynamic List with forms properties?

marc_carrio — Mon, 24 Oct 2011 08:30:16 GMT

Hi guys!How we can create list (enum) with the dynamic options, filling options in java class or with UEL expressions? In forms (act 5.6) I used:<select name="listCategory">${myVariable == 'A'?'<option value="a1">A1</option><option value="a2">A2</option>':' '}${myVariab

Re: Dynamic List with forms properties?

trademak — Mon, 24 Oct 2011 20:42:04 GMT

Hi,

It may be a good idea to implement your own custom form type.
In the Activiti Explorer you can find a UserFormType which is also an example of a flexible number of items.

Best regards,

Re: Dynamic List with forms properties?

marc_carrio — Tue, 25 Oct 2011 06:49:48 GMT

Finally I add code to the EnumFormPropertyRenderer.
I put the class and method in option values and I use java.reflect for call my Java that return a Map<String,String>.

I know that isn't the better solution :roll: , but works and is quick.

EnumFormPropertyRenderer code:


@SuppressWarnings("unchecked")
  @Override
  public Field getPropertyField(FormProperty formProperty) {
   
    ComboBox comboBox = new ComboBox(getPropertyLabel(formProperty));
    comboBox.setRequired(formProperty.isRequired());
    comboBox.setRequiredError(getMessage(Messages.FORM_FIELD_REQUIRED, getPropertyLabel(formProperty)));
    comboBox.setEnabled(formProperty.isWritable());

    String classe = null;
    String metode = null;
    String param = null;
    Map<String, String> llista = null;
     
    Map<String, String> values = (Map<String, String>) formProperty.getType().getInformation("values");
       
    if (values != null) {
        for (Entry<String, String> enumEntry : values.entrySet()) {
         if ("classe".equals(enumEntry.getKey())) {
          classe = enumEntry.getValue();
         }
         if ("metode".equals(enumEntry.getKey())) {
          metode = enumEntry.getValue();
         }
         if ("param".equals(enumEntry.getKey())) {
          param = enumEntry.getValue();
         }
        }
     }   
    
    if (classe == null ){
        if (values != null) {
          for (Entry<String, String> enumEntry : values.entrySet()) {
            // Add value and label (if any)
            comboBox.addItem(enumEntry.getKey());
            if (enumEntry.getValue() != null) {
              comboBox.setItemCaption(enumEntry.getKey(), enumEntry.getValue());
            }
          }
        }
        return comboBox;
    }
    
    try {
     
     Class<?> classeCombo = Class.forName(classe);
     
        Class<?> partypes[] = new Class[1];
        partypes[0] = String.class;
        
        Constructor<?> ct = classeCombo.getConstructor();
        Object retObj = ct.newInstance();
  Method metodeCombo = classeCombo.getDeclaredMethod(metode, partypes);

  llista = (Map<String, String>) metodeCombo.invoke(retObj, param);
  
 } catch (ClassNotFoundException e) {
  e.printStackTrace();
 } catch (SecurityException e) {
  e.printStackTrace();
 } catch (NoSuchMethodException e) {
  e.printStackTrace();
 } catch (IllegalArgumentException e) {
  e.printStackTrace();
 } catch (IllegalAccessException e) {
  e.printStackTrace();
 } catch (InvocationTargetException e) {
  e.printStackTrace();
 } catch (InstantiationException e) {
  e.printStackTrace();
 }
    
     
  if (llista != null) {
       for (Entry<String, String> enumEntry : llista.entrySet()) {
         // Add value and label (if any)
         comboBox.addItem(enumEntry.getKey());
         if (enumEntry.getValue() != null) {
           comboBox.setItemCaption(enumEntry.getKey(), enumEntry.getValue());
         }
       }
  }

    return comboBox;
  }

bpmn20.xml code:

<activiti:formProperty id="sel1" name="sel1" type="enum" required="true" readable="true" writable="true">
   <activiti:value id="classe" name="org.cgc.myProcess.bean.MyClass" />
   <activiti:value id="metode" name="getList" />
   <activiti:value id="param" name="${myVar}" />
</activiti:formProperty>

And MyClass code:

public class MyClass{

 public Map<String,String> getList(String myvar){
  
  Map<String,String> llista = new HashMap<String, String>();

  if ("A".equals(myvar)){
   llista.put("a1", "A1");
   llista.put("a2", "A2");
  }else{
   llista.put("b1", "B1");
   llista.put("b2", "B2");
  }
  
  return llista;
 }
}

Best Regards!

Re: Dynamic List with forms properties?

marc_carrio — Tue, 25 Oct 2011 11:48:33 GMT

I don't understand why the variable isn't evaluated… =S

<activiti:value id="param" name="${myVar}" />
Somebody knows why? and where I will touch for fix ?

Thanks!

Re: Dynamic List with forms properties?

marc_carrio — Wed, 26 Oct 2011 11:19:51 GMT

Ok, FormProperty values… not support Expressions… :roll:

I solved the problem changing it in activiti-engine.

Best regards!

Re: Dynamic List with forms properties?

jwistrom — Sun, 07 Jun 2015 11:14:16 GMT

How did you manage to make form property values accept expressions?

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