Hello All,
This post is about a common requirement of getting selected value & display value of af:selectOneChoice in the managed bean
normally when we try to get selected value of selectOneChoice in the managed bean (in ValueChange/ Validator or using binding) it returns the index of that row
so there is a little piece of code using that we can get selected value of choice component
This post is about a common requirement of getting selected value & display value of af:selectOneChoice in the managed bean
normally when we try to get selected value of selectOneChoice in the managed bean (in ValueChange/ Validator or using binding) it returns the 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 the sample and created a lov on a transient field
- Now dropped that ViewObject on the page as a table
- Created a value change listener in managed bean fro DeptIdTrans but it returns the index of the 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 the page and select any value in selectOneChoice (LOV) and see the result
