Pass list into a form property

[jwistrom]

Hi
I am rather new to Activiti but I have some knowledge. I am using Vaadin to render the forms. I have created my own fields for rendering. Now I want to create a form property (or something) so I can render a component with two tables (available values and assigned values) in the Bpmn xml I want to be able to specify a list of available values and the table of assigned values should be the values already selected in the corresponding process variable (this will be a recurring task)
How would I go about to accomplish this?

Very greatful for any answers

Regards
Johan

[trademak]

Hi Johan,

You would need to store the variables in the process context in the form field type converter.

Best regards,

[jwistrom]

Thank you. I will see what I can do about it. Do you know of any example I can look at? I am not so experienced so I haven't heard of "form field converter"

[trademak]

You can look at the Date converter as an example:

https://github.com/Activiti/Activiti/blob/master/modules/activiti-engine/src/main/java/org/activiti/...

Best regards,

[jwistrom]

Hi
From what I understand. The Date converter parses the string to a date format. In my case i pass in an expression that returns a list. How do I parse the string I pass in to an expression and then execute the expression in my custom form type (or custom form field)?

Best Regards

[jbarrez]

Pretty much the same way as the date, you just need to decide on a way to store the list as a string and then serialize/deserialize when needed.

[jwistrom]

Don't I need to pass in the list with the extension activiti:value in the xml? If so, what I understand expression can not be passed in, right? Isn't the date pattern passed in that way?

Regards
Johan

[jbarrez]

You would indeed need something like
<code>
<activiti:value id="left" name="Go Left" />
</code>
and then in the FormType implementation do something like .getInformation("left")

[jwistrom]

Then I will pass in a String right? If I pass in an expression, say
<code>${1+1}</code>

I have done like this in my custom form type.

<code>
for(FormValue fv : formProperty.getFormValues()){
         if (fv.getId().equals("myId")){
            myExpression = fv.getName();
         }
      }
</code>

But how do I interpret the incoming string as an expression because I do not get 2 in my form values, I get the string "${1+1}"

Rgds
Johan

[jbarrez]

Hmm you would to make it an Expression object, from the String (get the ExpressionManager from the ProcessEngineConfiguration), but you would need something to resolve it against (eg an execution).