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Thursday, 24 April 2014

Clear af:table filter programmaticallty , reset table filter in 12C (ADF)

Code to reset or clear af:table filter- here searchTabBind is the binding of af:table




    /**
     * method to reset filter attributes on an af:table
     * @param actionEvent event which triggers the method
     */
    public void resetTableFilterAction(ActionEvent actionEvent) {
        FilterableQueryDescriptor queryDescriptor = (FilterableQueryDescriptor) getSearchTabBind().getFilterModel();
        if (queryDescriptor != null && queryDescriptor.getFilterConjunctionCriterion() != null) {
            ConjunctionCriterion cc = queryDescriptor.getFilterConjunctionCriterion();
            List<Criterion> lc = cc.getCriterionList();
            for (Criterion c : lc) {
                if (c instanceof AttributeCriterion) {
                    AttributeCriterion ac = (AttributeCriterion) c;
                    ac.setValue(null);
                }
            }
            getSearchTabBind().queueEvent(new QueryEvent(getSearchTabBind(), queryDescriptor));
        }
    }

use this method on any button or link to clear af:table filter

Thursday, 17 April 2014

ViewObject Validation rules for transient attributes (Model level validation in ADF)

Hello All,
this post is about model level validation for transient attributes, often we need to apply some common types of validation on transient attributes (as for negative value, for email, for phone number)
in ADF ViewObject there is a editor for validation rules for transient attributes, so now see how to use that editor and rules


  • Create a fusion web application and prepare model layer using Departments table of HR schema


  • Then create a transient attribute in viewObject and you can see that Validation Rules tab appears only in case of transient attribute



  • Now click on add icon to add new validation rule for attribute, you can see there are multiple types for that validation rule 





  • In this post i have used Compare and Regular Expression rules, suppose i have to check that value of transient attribute must not be 100 , so for that rule will be like this, and write a proper message for failure handling 



  • Now run your BC4J tester and check , a window with error message appears there in case of failure


  • You can also check this validation on your page, some more- i have added one more transient field for Email Address and applied a regular expression to validate this field (ADF by default provides regular expression for Email and Phone Number pattern for others you can use your own pattern)


  • After model level configurations , i have dropped Departments ViewObject on page as ADF form, here you can see both validation are working 




Cheers :-) Happy Learning

Thursday, 10 April 2014

Pagination in ADF table with Jdeveloper 12.1.2 (ADF 12C) - returned back

Hello All,
Pagination in ADF table was very requested feature after Jdev & ADF 10g.
now in 12C again it is here and quite simple

  • Created a fusion web application using Departments table of HR Schema and dropped it on page as ADF table


  • Now suppose i want to show pagination after 5 rows so to achieve this follow these steps
  • Select table in structure window and go to property inspector change it's scrollPolicy to page ,scrollPolicy is mechanism to scroll data inside table




  • Now select table on page and go to binding tab and select IteratorBinding of Departments table and change rangeSize to 5, by default it is 25 (means fetched 25 rows at a time)


  • Set autoheightRows to 0 and styleClass to AFStretchWidth and you are done now run your page


  • It works good in mozilla ,chrome and IE, but sometimes you can face a problem of finding current row as it may be in second page :-(

Monday, 7 April 2014

Get updated model values in value change listener instantly, ProcessUpdates in ADF (a beauty)

Hello All,

This posts talks about updating model instantly when a attribute is changed on page level.
In ValueChangeListener of component if we try to get new value from Model layer, it always returns old value, then we have only one option to get new value, use event object (evt.getNewValue();)
but sometimes we need to update model same time
So how to do this-

  • Created a Fusion Web Application using Departments table of HR Schema (Oracle)


  • Dropped Departments Vo on page as a form, and created ValueChangeListener on DepartmnetName field to get new value 





  • Now i have written a code to get DepartmentName from current row of Departments VO (ViewObject) and to get from ValueChangeEvent

  • Method in AMImpl- Called in ValueChangeListener through binding Layer

    /**Method to print Department Name */
        public void getDeptNameAction() {
            ViewObject depart = this.getDepartments1();
            Row curRow = depart.getCurrentRow();
            if (curRow != null) {
                System.out.println("Current Department from model is-" + curRow.getAttribute("DepartmentName"));
            }
        }
    


    Code in ValueChangeListener - AM Method Called and Code to get new value from event itself

        /**Value change listener for Department Name
         * @param vce
         */
        public void deptNmVCE(ValueChangeEvent vce) {
            if (vce.getNewValue() != null) {
                System.out.println("New Value in VCE-" + vce.getNewValue());
                BindingContainer bc = BindingContext.getCurrent().getCurrentBindingsEntry();
                OperationBinding ob = bc.getOperationBinding("getDeptNameAction");
                ob.execute();
            }
        }
    

  • In this case when i have changed value on page 



  • see the result -output from valuechangelistener- Model layer returns old value :-(


  • Now to update value in Model layer , i have just called processUpdates in ValueChangeListener- See the code

  •     /**Value change listener for Department Name
         * @param vce
         */
        public void deptNmVCE(ValueChangeEvent vce) {
            if (vce.getNewValue() != null) {
                //Method to update Model in VCE
                vce.getComponent().processUpdates(FacesContext.getCurrentInstance());
                System.out.println("New Value in VCE-" + vce.getNewValue());
                BindingContainer bc = BindingContext.getCurrent().getCurrentBindingsEntry();
                OperationBinding ob = bc.getOperationBinding("getDeptNameAction");
                ob.execute();
            }
        }
    

  • see the result -Value is updated in model instantly (in VCE)

so this is how processUpdates works, Cheers :-)
See one more post on this concept with different usecase- Update Model Values while Validation (Exception) occurs on page on Value Change event
Happy Learning

Wednesday, 2 April 2014

Performing Partial Rollback (Undo Changes) operation in ADF, Stay on current row after rollback

Hello All ,
This post talks about a common requirement of using partial rollback in ADF

Suppose there is two tables on page Departments and Employees, and i have changed one row in Departments table and same time created a row in Employees table, now i want to rollback the changes done in Departments table only

In this case if i use default Rollback operation then it will not only undo the changes of Department table but also remove the newly created row of Employees table
but this was not my purpose.

So to do this kind of things we can use partial rollback operation
  • I have created a fusion web application (Model & VC) using Departments & Employees Table of Oracle's default HR Schema

  • Now drop departments & employees VO on page with it's default operations (CreateInsert, Delete, Execute, Commit & Rollback) and a button to execute partial rollback of departments ViewObject


  • Here in this example i am creating partial rollback for Departments VO only, so to do this add a new transient attribute in Departments Vo to get current state of each row




  • How to get state of each row , in RowImpl class of departments ViewObject , write this code in getter of transient attribute or see my previous blog-post Identifying Modified/newely added row in af:table, get all modified rows of viewobject in bean

  •     /**
         * Gets the attribute value for the calculated attribute RowStatusTrans.
         * @return the RowStatusTrans
         */
        public Integer getRowStatusTrans() {
            /*here row is reference variable of collection, this expression returns an int value if it is
             2-Modified
             0-New
             1-Unmodified
            -1-Initialized
            */
            byte entityState = this.getEntity(0).getEntityState();
            return new Integer(entityState);
        }
    

  • Have created a method to remove newly added row , and to undo changes in existing rows of departments VO in Impl class

  •     /**Method to revert changes of current row
         * @param curRow
         */
        public void revertChangesCurrentRow(Row curRow) {
            if (curRow != null) {
                curRow.refresh(Row.REFRESH_UNDO_CHANGES | Row.REFRESH_WITH_DB_FORGET_CHANGES);
            }
        }
    
        /**Method to check whether row should be removed or not 
         * If it is new - removed
         * If old one- Undo Changes
         * */
        public void revertOrremoveRowValues() {
            ViewObject deptVo = this;
            RowSetIterator deptIter = deptVo.createRowSetIterator(null);
            while (deptIter.hasNext()) {
                Row nextRow = deptIter.next();
                if (nextRow.getAttribute("RowStatusTrans") != null) {
                    Integer rowStatus = (Integer) nextRow.getAttribute("RowStatusTrans");
                    if (rowStatus == 2) {
                        System.out.println("Modified Rows-" + nextRow.getAttribute("DepartmentId"));
                        revertChangesCurrentRow(nextRow);
                    } else if (rowStatus == 0) {
                        System.out.println("New Row Removed");
                        nextRow.remove();
                    }
                }
            }
            this.executeQuery();
        }
    

  • To read more about REFRESH_UNDO_CHANGES and other constants -http://docs.oracle.com/cd/B14099_19/web.1012/b14022/oracle/jbo/Row.html
  • Exposed this method to client and added it to page bindings then called it on Partial Rollback button


  • After running application, i have changed some rows of Departments table and created a new row in employees table


  • Now if i use rollback, it will also remove the new row of employees table, this is the dis-advantage of using rollback


  • Again i have changed some rows of departments table and created a new row in employees table


  • Now see when i click on partial rollback button, it will only undo changes done in department table and employee table is untouched


  • And to stay on current row after partial rollback operation just remove executeQuery from revertOrremoveRowValues() method
Download Sample App
Cheers :-)  Happy Learning