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Thursday, March 27, 2014

Identifying Modified/newely added row in af:table, get all modified rows of viewobject in bean

This post talks about two requirements-

  1. Want to highlight modified rows only on page
  2. Want to get modified rows in managed bean
First One could be achieved without writing a single line of code only using expression, a row in table or view object has four state-
  • New
  • Modified
  • Un-Modified
  • Initialized


/* this expression returns state of current row in collection such as table or treeTable*/
#{row.row.entities[0].entityState} 

/*here row is reference variable of collection, this expression returns an int value if it is 
 2-Modified
 0-New
 1-Unmodified
-1-Initialized
*/

  • I'm using Departments table of HR Schema to implement this sample app
  • after business components configuration ,Drop departments VO from data control on page as af:table
  • Now to check row status , i have written following expression in inline style of af:column of af:table, so that it can check state of all rows of table 

    • #{row.row.entities[0].entityState==2 ? 'background-color:orange' : row.row.entities[0].entityState==0 ? 'background-color:darkgreen' : ''}

  • Now Run your page and change any value of table
       After Updating Values in Row- see modified rows are highlighted
  •  Now you are done with first requirement , if we talk about second one, in case you want to get all modified rows in managed bean to perform some operation
  • To achieve this i have used a transient attribute in Departments view Object to store state of each row
  • Now in RowImpl of departments viewobject i have to write some code to get current state of Row, see the getter method of transient attribute in RowImpl

    •     /**
     * Gets the attribute value for the calculated attribute CheckRowStatus.
     * @return the CheckRowStatus
     */
    public Integer getCheckRowStatus() {
        byte entityState = this.getEntity(0).getEntityState();
        return new Integer(entityState);

        // return (Integer) getAttributeInternal(CHECKROWSTATUS);
    }

  • Now i have placed a button on page to get all modified rows and show a message on page through managed bean
  • See the method written in ApplicationModuleImpl class and then exposed to client to be used in managed bean action event

    •     /**Method to get all modified rows and store corresponding Department Name in an ArrayList
     * @return
     */
    public ArrayList<String> getModifiedRows() {
        ArrayList<String> deptNm = new ArrayList<String>();
        ViewObject deptVo = this.getDepartmentsView1();
        RowSetIterator deptIter = deptVo.createRowSetIterator(null);
        while (deptIter.hasNext()) {
            Row nextRow = deptIter.next();
            if (nextRow.getAttribute("CheckRowStatus") != null) {
                Integer rowStatus = (Integer)nextRow.getAttribute("CheckRowStatus");
                if (rowStatus == 2) {
                    deptNm.add(nextRow.getAttribute("DepartmentName").toString());
                }
            }
        }
        return deptNm;

    }

  • Now call this method in managed bean through Binding Layer

    •     /**Method to get BindingContainer of current page
     * @return
     */
    public BindingContainer getBindings() {
        return BindingContext.getCurrent().getCurrentBindingsEntry();
    }

    /**Method to call AM method and to show modified rows on page in FacesMessage
     * @param actionEvent
     */
    public void getModifiedRows(ActionEvent actionEvent) {
        OperationBinding ob = getBindings().getOperationBinding("getModifiedRows");
        ob.execute();
        if (ob.getResult() != null) {
            ArrayList<String> deptName = (ArrayList<String>)ob.getResult();
            StringBuilder saveMsg =
                new StringBuilder("<html><body><b><p style='color:red'>Modified Rows in Departments table are-</p></b>");

            saveMsg.append("<ul>");
            for (String name : deptName) {
                System.out.println(name);
                saveMsg.append("<li> <b>" + name + "</b></li>");
            }

            saveMsg.append("</ul><br>");
            saveMsg.append("</body></html>");
            FacesMessage msg = new FacesMessage(saveMsg.toString());
            FacesContext.getCurrentInstance().addMessage(null, msg);
        }
    }

  • Now again run this page and change some departments then click on get modified rows, it will show currently modified rows

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