Tag: Set

Requirement – how to set value of attribute value in binding…

Solutions – you can use this expression –

JsfUtils.setExpressionValue("#{ManagedBean.empName}", "Vinay"); 

You have to add this method in JsfUtils class.

Note to call the getters and setters via your EL expression, you don’t include the get/set prefix.

 public static void setExpressionValue(String expression, Object newValue) {
    FacesContext facesContext = getFacesContext();
    Application app = facesContext.getApplication();
    ExpressionFactory elFactory = app.getExpressionFactory();
    ELContext elContext = facesContext.getELContext();
    ValueExpression valueExp = elFactory.createValueExpression(elContext, expression, Object.class);

    //Check that the input newValue can be cast to the property type
    //expected by the managed bean.
    //If the managed Bean expects a primitive we rely on Auto-Unboxing
    //I could do a more comprehensive check and conversion from the object
    //to the equivilent primitive but life is too short
    Class bindClass = valueExp.getType(elContext);
    if (bindClass.isPrimitive() || bindClass.isInstance(newValue)) {
      valueExp.setValue(elContext, newValue);
    }
  }

Happy coding in Techartifact with Vinay…