Blocking row navigation in af:table , synchronize row selection with model in case of validation failure- Oracle ADF

In ADF we often work on editable af:table and when we use af:table to insert ,update or delete data, it is normal to use some validation
but problem is when some validation failure occurs on page (in af:table) ,still we can select another row and it shows as currently selected Row
this is a bit confusing for user as Row Selection of af:table is not synchronized with model or binding layer

See Problem- 

• I have an editable table on page





• Added a validation to check negative value in field of LocationId, now navigate to another row





• See selected focus is on Academic, but problem is when there is validation failure, why it is showing other row as selected ? 




• If you check in ViewObject , you will find that row with DepartmentName Human Resource is current row

ADF framework provides a property in af:table to control navigation in af:table when there is some error or validation failure- blockRowNavigationOnError
See in oracle docs about this proprty-

Valid Values: always, never, auto


Whether we want to block row navigation in case of validation failure.
This is when you select a row and do some editing inside the table or in a related form, and this editing causes some validation failures. At this time, if you click on a different row in table, we want to block you from moving to the new row.
possible values are: always, never and auto. default value is auto.

• always means we block the row navigation
• never means we don't block and let the row navigation happen
• auto means the framework will make the decision

by default in af:tabel it's value is <auto>

Change it to <always> and now see behavior on page

 now if you try to select another row, it is not get selected and selected focus is on row with validation

Sample ADF Application-Download
Cheers - Happy Learning :-)

Overriding Reset button action (QueryOperationListener) of af:query, Changing query mode, Handling QueryOperationEvent programmatically-Oracle ADF

Hello All ,
previously i had a requirement of validating af:query fields so i have found two ways to do that
see -Overriding default query listener ,field validation of af:query- Oracle ADF

now i have to set some values in af:query when user clicks on Reset button of query so to do that i have to override default QueryOperationListener in order to handle QueryOperationEvent  



Oracle docs says-

af:query- The query component provides the user the ability to perform a query based on a saved search or personalize saved searches in Oracle ADF. The component displays a search panel with various elements, each of which help the user to accomplish various tasks. 

QueryOperationListener- QueryOperationListener class. A registered queryOperationListener is invoked when the user's action results a queue and broadcast of QueryOpertionEvent on the component. For example, click the delete icon in the QuickCriteria component or click "Save", "Reset" etc buttons in Query component to perform a Query Operation.

 QueryOperationEvent-A user can perform various operations on saved searches while interacting with a query component. These actions include creating, overriding, deleting, duplicating, selecting, resetting and updating a saved search

want to read more-  
http://docs.oracle.com/cd/E17904_01/apirefs.1111/e10684/oracle/adf/view/rich/event/QueryOperationListener.html
http://jdevadf.oracle.com/adf-richclient-demo/docs/apidocs/oracle/adf/view/rich/event/QueryOperationEvent.html  

so i have created a QueryOperationListener in managed bean that communicates with QueryOperationEvent

in this method we can capture various events of af:query as reset,update
so for this use-case i have to capture reset and set desired values in query attribute (viewObject's bind variable) , here i am using Departments table of HR Schema

now see the code (i have to set Human Resource department on reset in search panel) - how to capture raised event when user clicks on Reset button of af:query

    /**Custom QueryOperationListener that hadles variois events raised by af:query
     * @param queryOperationEvent
     */
    public void deptSeacrhQueryOperationList(QueryOperationEvent queryOperationEvent) {
        //Invoke default operation listener
        invokeEL("#{bindings.DepartmentsVOCriteriaQuery.processQueryOperation}", Object.class,
                 QueryOperationEvent.class, queryOperationEvent);

        System.out.println("Query Event is-" + queryOperationEvent.getOperation().name());
        //Check that current operation is RESET
        if (queryOperationEvent.getOperation().name().equalsIgnoreCase("RESET")) {
            DCIteratorBinding iter = (DCIteratorBinding) getBindings().get("Departments1Iterator");

            ViewObjectImpl vo = (ViewObjectImpl) iter.getViewObject();
            // Setting the value of bind variable
            vo.ensureVariableManager().setVariableValue("BindDeptNm", "Human Resource");
        }
    }

to invoke Expression use this method

    /**
     * @param expr
     * @param returnType
     * @param argTypes
     * @param args
     * @return
     */
    public Object invokeMethodExpression(String expr, Class returnType, Class[] argTypes, Object[] args) {
        FacesContext fc = FacesContext.getCurrentInstance();
        ELContext elctx = fc.getELContext();
        ExpressionFactory elFactory = fc.getApplication().getExpressionFactory();
        MethodExpression methodExpr = elFactory.createMethodExpression(elctx, expr, returnType, argTypes);
        return methodExpr.invoke(elctx, args);
    }

    /**
     * @param expr
     * @param returnType
     * @param argType
     * @param argument
     * @return
     */
    public Object invokeEL(String expr, Class returnType, Class argType, Object argument) {
        return invokeMethodExpression(expr, returnType, new Class[] { argType }, new Object[] { argument });
    }

now run this page and check on click of reset button this listener is invoked and sets the value of af:query field
Default page view -on-load

 after click on Reset-

other than this reset we can handle other events of af:query (for saved search there are various events based on corresponding operations) as DELETE, UPDATE, CREATE

on clicking various button of this personalized search box we get respective operation  name in managed bean and can handle as  done for RESET operation

Changing mode of default search panel (af:query) of ADF-
this is nothing but  2 lines that changes the mode of af:query - Basic to Advanced & Advanced to Basic

so dropped a button on page to change af:query search mode and see the code of ActionListener for this

//Binding of af:query in managed bean  
  private RichQuery queryPanelDept;
    
    public void setQueryPanelDept(RichQuery queryPanelDept) {
        this.queryPanelDept = queryPanelDept;
    }
    public RichQuery getQueryPanelDept() {
        return queryPanelDept;
    }

    private String current_mode = "B";

    /**Method Action to change mode of af:query
     * @param actionEvent
     */
    public void changeModeAction(ActionEvent actionEvent) {
        if (current_mode == "B") {
            getQueryPanelDept().getValue().changeMode(QueryDescriptor.QueryMode.ADVANCED);
            current_mode = "A";
        } else if (current_mode == "A") {
            getQueryPanelDept().getValue().changeMode(QueryDescriptor.QueryMode.BASIC);
            current_mode = "B";
        }
    }

now run page and see-

Cheers - Happy learning :-) Download Sample ADF App

Getting selected value (not index) & display value of select one choice programmatically in ADF

Hello All,
This post is about a common requirement of getting selected value & display value of af:selectOneChoice in managed bean
normally when we try to get selected value of  selectOneChoice in managed bean (in ValueChange/ Validator or using binding) it returns index of that row
so there is a little piece of code using that we can get selected value of choice component

• I have used Departments table of HR Schema in sample and created a lov on a transient field





• Now dropped that ViewObject on page as a table 





• Created a value change listener in managed bean fro DeptIdTrans but it return index of selected value










• Then i googled about it and used this method to solve my headache, try to get attributeValue instead of inputValue, see the code written in valueChaneListener in managed bean



    /**Value Change Listener of DeptIdTrans (to get selected and display value)
     * @param vce
     */
    public void deptIdVCE(ValueChangeEvent vce) {
        System.out.println("New Value is-" + vce.getNewValue());
        if (vce.getNewValue() != null) {
            this.setvalueToExpression("#{row.bindings.DeptIdTrans.inputValue}",
                                      vce.getNewValue()); //Updating Model Values
            Integer selectedCode =
                Integer.parseInt(this.getValueFrmExpression("#{row.bindings.DeptIdTrans.attributeValue}").toString());

            System.out.println("******** Selected Value in List***** " + selectedCode);
            System.out.println("*******Display Value in List ****" +
                               getValueFrmExpression("#{row.bindings.DeptIdTrans.selectedValue.attributeValues[1]}"));

        }
    }



• There is two methods to set and get value in expression (EL)



    /**Method to set value in Expression (EL)
     * @param el
     * @param val
     */
    public void setvalueToExpression(String el, Object val) {
        FacesContext facesContext = FacesContext.getCurrentInstance();
        ELContext elContext = facesContext.getELContext();
        ExpressionFactory expressionFactory = facesContext.getApplication().getExpressionFactory();
        ValueExpression exp = expressionFactory.createValueExpression(elContext, el, Object.class);
        exp.setValue(elContext, val);
    }

    /**Method to get value from Expression (EL)
     * @param data
     * @return
     */
    public String getValueFrmExpression(String data) {
        FacesContext fc = FacesContext.getCurrentInstance();
        Application app = fc.getApplication();
        ExpressionFactory elFactory = app.getExpressionFactory();
        ELContext elContext = fc.getELContext();
        ValueExpression valueExp = elFactory.createValueExpression(elContext, data, Object.class);
        String Message = null;
        Object obj = valueExp.getValue(elContext);
        if (obj != null) {
            Message = obj.toString();
        }
        return Message;
    }



• Again run page and select any value in selectOneChoice (lov) and see the result

Cheers :-) Happy Learning

Reference-https://blogs.oracle.com/shay/entry/getting_the_value_from_a_selec