how to set to OldValue the primefaces selectOneMenu programmatically

Question

Java / PrimeFaces 3.5

I would like to rollback primeFaces selectOneMenu Old Value and reload it updating the component at screen.

The selectOneMenu is loaded with FIRST, SECOND , THIRD values and default value is setted with FIRST

If I change the selectOneMenu value From FIRST to THIRD, I would like to set it to FIRST again.

<p:selectOneMenu id="statusProposta"
   value="#{propostaBean.propostaComercial.proposta_Status}"
     items="#{propostaBean.statusProposta}"
     valueChangeListener="#{propostaBean.regraStatusProposta}" >
     <p:ajax  event="change"  
       process="statusProposta" update="statusProposta" />
     <f:selectItem itemLabel="" itemValue="" />
     <f:selectItems value="#{propostaBean.statusProposta}" />
</p:selectOneMenu>

StatusProposta :

public enum StatusProposta { FIRST,SECOND and THIRD .....

Bean :

public void regraStatusProposta(ValueChangeEvent ev){
   **I dont know how to set the old value and update it in screen.**
   ...

I need to set to OldValue the selectOneMenu and update the oldvalue in the screen @Makky — Al2x, Feb 17 '14 at 14:40
when Im going to be to change the value to a new one clicking on it, the old value has to be setted and updated on selectOneMenu component screen — Al2x, Feb 17 '14 at 15:04
oh so you want to display the last selected value somewhere when a user select different value ,right ?? — Makky, Feb 17 '14 at 15:32

score 0 · Answer 1 · answered Feb 17 '14 at 15:40

0

public void regraStatusProposta(ValueChangeEvent ev){    
//get old value first 
Object oldValue=ev.getOldValue();    
}

More on ValueChangeEvent API

answered Feb 17 '14 at 15:40

Makky

17,117
17
63
86

Thats no make sense. where will I set oldValue in the component ? you are setting just an oldValue Object. – Al2x Feb 17 '14 at 16:11
@Al2x I think you either very new to Java or its your bad day today. This makes sense dude. You get the old value now its upto you where you assign it . We're here to help you not to complete your whole assignment. – Makky Feb 17 '14 at 16:36
I set my entity property to the oldValue and update it with ajax but the new value keeps on the component screen – Al2x Feb 17 '14 at 16:49
1. The selectOneMenu is previously loaded with FIRST,SECOND AND THIRD values. when I load my form it comes with default the FIRST one. 2- If I choose THIRD value, I need my bean set the default selectOneMenu value to FIRST again automatically and refresh the component at screen. got it ? – Al2x Feb 17 '14 at 16:55
@Al2x Why would you want your selectOneMenu to go back to FIRST value again ,explain that? – Makky Feb 17 '14 at 16:57
Its my business rule. If customer select one option differente from what is expected I need to set the component with the old value again. got it ? – Al2x Feb 17 '14 at 17:35

score 0 · Accepted Answer · answered Feb 18 '14 at 10:47

http://forum.primefaces.org/viewtopic.php?f=3&t=36447

resetinput

blog post: Reset Values for JSF 2.2

posted by Howard at primefaces forum

http://www.primefaces.org/showcase/ui/resetInput.jsf

public void reset() {  
    RequestContext.getCurrentInstance().reset("form:panel");  
}

score 0 · Answer 3 · answered Dec 30 '21 at 13:34

I've created this utility for PrimeFaces which checks if the component is visible, otherwise it would log a WARN on console.

public static void resetUIComponents(String... componentsId) {
    for (String id : componentsId) {
        if (FacesContext.getCurrentInstance().getViewRoot().findComponent(id) != null) {
            PrimeFaces.current().resetInputs(id);
        }
    }
}

So you can use it like this:

ViewUtils.resetUIComponents("form:id1", "form:id2")

how to set to OldValue the primefaces selectOneMenu programmatically

3 Answers3