Validation for transient VO/table rows

Question

Hi,
I have 2 pages:
1. First page is an entry page with an editable table like this (It's backed by a transient VO which I initialize with some blank lines.) and a submit button:
Part Type (dropdown)          Part num (text box)          Quantity (text box)     
2. Second page is a read only table that shows results from the same transient VO with additional info.
Part Type          Part num          quantity     price
When hitting the submit button on the first page, I'd like to run a custom validator that validates each row in the entry page table.
Since it's a transient VO and has no entity object, I didn't know how to do it in the model. The validation should use the part type and part code values and call a database API to do tha validation, and then display the message from the API in the part code text box.
I got it to (sort of) work using a validator method in a backing bean.
This is how I implemented the part validation (on first page).
     - Make part type autosubmit = true.
     - Make the editable table bind to the backing bean - it basically has a getTable1() and setTable1 method.
     - Add validator to Part num column.
     - In the validator code in the backing bean, use
          it3_validator(FacesContext facesContext,
                              UIComponent uIComponent, Object object)
             FacesCtrlHierNodeBinding q = (FacesCtrlHierNodeBinding)this.getTable1().getRowData();
             Row currentRow  = q.getRow();
          OperationBinding method = getBindings().getOperationBinding("validateItem");  //call database api in AM
                 method.getParamsMap().put("item_number_in",(String)object);
             method.getParamsMap().put("item_type_in",(String)currentRow.getAttribute("PartType"));
          map = (HashMap)method.execute();
             if (map.get("valid_item")!= null && map.get("valid_item").toString().compareToIgnoreCase("Y") != 0)
                      String msgS = (String)map.get("error_msg");
                      FacesMessage message = new FacesMessage(FacesMessage.SEVERITY_ERROR, msgS, msgS);
                      facesContext.addMessage(uIComponent.getClientId(facesContext), message);
                      ((RichInputText)uIComponent).setValid(false);                        
     It works, but once a part no in a row becomes invalid it doesn't recognize changes in the part type in that row. How can I set it so that when I change part type, the validation recognizes that I've change the part type? So if I enter a correct part num but wrong pary type, and then change part type to correct value, it should not throw error message again.
Should I even be doing this in the backing bean? Is there some way I can just implement it in the model so I don't have to worry about getting row level info from getTable1?
I'd posted on this before, but the solution I tried didn't really work at all (the implementing-custom-generic-plsql uses entity object to execute the db api)
Re: Validation using a DB function
I'm using JDev 11.1.1.2.0
thanks,
Kalp

Answer 1

Thank you Timo that helps me understand the validation behavior..
I added this in the AM and it'scalling the validation:
        Row[] rows = vo.getAllRowsInRange();
        for (Row row : rows)
            row.validate();
        }and I added more code to the validation:
    @Override
    public void validate(){
        System.out.println("Validate in transient vo");
        System.out.println("getPartType from rowimpl:"+getPartType());
        System.out.println("getPartCode from rowimpl:"+getPartCode());       
        HashMap map = new HashMap();
        map = validateItem(getPartCode().toString(),getPartType().toString());
        if (map.get("valid_item")!= null && map.get("valid_item").toString().compareToIgnoreCase("Y") != 0)
            throw new JboException(map.get("error_msg").toString());
        super.validate();
    }   The message then appears as a popup which shows the error message for the first invalid row and also doesnt stop the navigation to next page.
So I changed to:
   @Override
    public void validate(){
        System.out.println("Validate in transient vo");
        System.out.println("getPartType from rowimpl:"+getPartType());
        System.out.println("getPartCode from rowimpl:"+getPartCode());       
        HashMap map = new HashMap();
        map = validateItem(getPartCode().toString(),getPartType().toString());
        if (map.get("valid_item")!= null && map.get("valid_item").toString().compareToIgnoreCase("Y") != 0)
            FacesContext fctx = FacesContext.getCurrentInstance();
            String msgS = (String)map.get("error_msg");
            FacesMessage message = new FacesMessage(FacesMessage.SEVERITY_ERROR, msgS, msgS);
            fctx.addMessage(null, message);
        super.validate();
    }   This is better, but still I don't know how to tie the error message to a UI component. This shows the list of validation messages in the popup but I want to tie the corresponding error message to the part code for the invalid row in the editable table UI.
I want it to have the same look/feel/behavior as when I add something like a Compare validator on an attribute in the VO. If I add a validator like Compare to 10, then the message is tied to the specific cell
in the UI table and it stops navigation.
How can I mimic this "seeded" type of behavior?
Thanks for your help on this!
thanks,
Kalp