[SOLVED] - Clear SelectManyChoice selected values

Question

I am using JDeveloper 11.1.1.3.
I have a selectManyChoice on multiple pages throughout my app. Some selectManyChoice utilize the same Iterator.
Scenero 1 :
I go to a page A, select values from the selectManyChoice drop down, and click a commandButton to execute code in the backing bean (to iterate over the selected values and build a whereClause).
I then navigate to page B (which utilizes the same Iterator). The selectManyChoice drop down, on Page B, has the same values checked that were checked on page A.
Scenero 2 :
If I select values on page A and do not click the commandButton, then the values are NOT checked when I navigate to page B.
How do I clear checked values in a selectManyChoice drop down?
Edited by: Kennith B on Mar 16, 2011 12:17 PM
Edited by: Kennith B on Mar 16, 2011 12:17 PM

Answer 1

I was nulling out the selected values using the setValue() on the component; however, the selected values were still being displayed on the screen. To actually null out and make the selected values disappear from the screen , I had to set the value binding of the selectManyChoice (#{bindings.Category.inputValue}) to null. The code is below:
<b>Code in JSFUtils</b>
    public static void setExpressionValue(String expression,
                                          Object newValue) {
        FacesContext ctx = getCurrentFacesContext();
        Application app = ctx.getApplication();
        ExpressionFactory elFactory = app.getExpressionFactory();           
        ELContext elContext = ctx.getELContext();                  
        ValueExpression valueExp = elFactory.createValueExpression(elContext, expression, Object.class);
        valueExp.setValue(elContext, newValue);
}<b>Code in backing bean</b>
  public void doClear_action(ActionEvent actionEvent) {
    JSFUtils.setExpressionValue("#{bindings.Category.inputValue}", null);
  }<b>Code in JSPX</b>
                      <af:selectManyChoice value="#{bindings.Category.inputValue}"
                                           label="Category"
                                           binding="#{backingBeanScope.backing_reports_openDispatchRequests.smc1}"
                                           id="smc1"
                                           contentStyle="width:800.0px;"
                                           valuePassThru="true">
                        <f:selectItems value="#{bindings.Category.items}"
                                       binding="#{backingBeanScope.backing_reports_openDispatchRequests.si1}"
                                       id="si1"/>
                      </af:selectManyChoice>
                      <af:commandButton text="Clear"
                                      binding="#{backingBeanScope.backing_reports_openDispatchRequests.cb3}"
                                      id="cb3"
                                      actionListener="#{backingBeanScope.backing_reports_openDispatchRequests.doClear_action}"/>Also, the value binding needs to be initialized on page load when switching between pages that utilize the same Iterator . When values are selected and the clear button is not clicked, then the values will be displayed on all pages that utilize that Iterator.
To correct this, the following code needs to be added to the accessor of the selectManyChoice component:
public RichSelectManyChoice getSmc1(){
    JSFUtils.setExpressionValue("#{bindings.Category.inputValue}", null);
}Edited by: Kennith B on Mar 16, 2011 12:39 PM
Edited by: Kennith B on Mar 16, 2011 1:01 PM