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Monday, 12 May 2014

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

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