doubt in value change event

[Sylven Yip]

i fail to change the backing-bean's property in a value change event.
it seem's some process invoke the property's set method and set the property to old value.


the jsf fragment:

<h:inputText id="from" value="#{QueryBean.from}"/>
<h:selectOneMenu immediate="true" onchange="this.form.submit();" valueChangeListener="#{QueryBean.change}">
                    <f:selectItems value="#{QueryBean.stations}"/>
                </h:selectOneMenu>

the listener method:

    public void change(ValueChangeEvent event){
        System.out.println("event value:"+event.getNewValue());
        this.from=(String) event.getNewValue();
    }    

the binding property and bean methods:

private String from="start";
    public String getFrom() {
        System.out.println("get from:"+from);
        return from;
    }
    
    public void setFrom(String from) {
        System.out.println("set from:"+from);
        this.from = from;
    }
    

the code as above,i want to change the <h:inputText>'s value when i change the value of <selectOneMenu>.

but the output as follow:
event value:aaa
get from:aaa
set from:bbb
get from:bbb

can any one tell me how can i do this with value change event and who invoke the method set the property back to old value?
thanks!

[Mark Spritzler]

In your change method, at the very end, you need to forward JSF to the render phase. I forget the exact API call. But that is what I see missing, and something that everyone misses using value change event.

Mark

[Sylven Yip]

thanks Mark.
that it.

FacesContext.getCurrentInstance().renderResponse();

[Kumar Saravanan]

This is my listener method

value is an instance variable in my backing bean.

public void changeValue(ValueChangeEvent event) {
value = (String) event.getNewValue();
FacesContext.getCurrentInstance().renderResponse();
}

in my xhtml page,

<h:selectOneMenu valueChangeListener="#{mybean.changeValue}" immediate="true" onchange="submit();"
value="#{mybean.value}">
<f:selectItems value="#{mybean.options}"/>
</h:selectOneMenu>
<ui:include src="mypage.xhtml"/>

My problem here is before the value change listener is getting invoked the getter property which is referred in mypage.xhtml is getting invoked before the value change listener.

can anyone assist?

Thanks
Kumar
[ November 14, 2007: Message edited by: Kumar Saravanan ]

[Mark Spritzler]

Originally posted by Kumar Saravanan:
This is my listener method

value is an instance variable in my backing bean.

public void changeValue(ValueChangeEvent event) {
value = (String) event.getNewValue();
FacesContext.getCurrentInstance().renderResponse();
}

in my xhtml page,

<h:selectOneMenu valueChangeListener="#{mybean.changeValue}" immediate="true" onchange="submit();"
value="#{mybean.value}">
<f:selectItems value="#{mybean.options}"/>
</h:selectOneMenu>
<ui:include src="mypage.xhtml"/>

My problem here is before the value change listener is getting invoked the getter property which is referred in mypage.xhtml is getting invoked before the value change listener.

can anyone assist?

Thanks
Kumar

[ November 14, 2007: Message edited by: Kumar Saravanan ]

I am confused why you need a value= in your h:selectOneMenu

Mark

[Kumar Saravanan]

Hi Mark,

selected dropdown value needs to be selected once the page is refreshed (onsubmit()) and that is the reason i have value="" in h:selectOneMenu.

Thanks
Kumar