Hi Martin!
As I know from the example 1 of the Apache MyFaces jsValueChangeListener Web
site, I don't need to use the $destElem to achieve a change in the target
element:
Example 1
Suppose we have two text fields on a page. We would like to keep the value
of the second text field in sync with the value of the first. This can be
accomplised with the following code:
<h:inputText id="text1">
<t:jsValueChangeListener for="text2" property="value"
expressionValue="$srcElem.va
lue" />
</h:inputText>
<h:inputText id="text2"/>
When the value of text1 changes, the 'onchange' event is triggered. The
javascript expression specified by 'expressionValue' is evaluated, and the
result is assigned to the specified property (in this case, 'value') of the
target control.
But I don't need to use JavaScript at the moment because of changing
requirements, so that's not an acute problem I'm working on. That's why I
won't debug the JavaScript for the moment, maybe it will be necessary
later...
Regards,
Matthias
> -----Ursprüngliche Nachricht-----
> Von: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] Auftrag
> von Martin Marinschek
> Gesendet: Donnerstag, 1. Dezember 2005 19:47
> An: MyFaces Discussion
> Betreff: Re: jsValueChangeListener - how to detect radio button
> selections
>
>
> no, no, it's surely not the expression syntax you need to use. This
> would be evaluated in the Faces-Subsystem, not by JavaScript.
>
> I wonder from your expression what you want to achieve - you'll need
> to set something to a destElem for the listener to make sense.
>
> In any case, your original string was correct, obviously it doesn't
> make any sense with the rest of your component tree, though.
>
> Fire up your JavaScript debugger and step into
>
> JSListener.js
>
> function orgApacheMyfacesJsListenerSetExpressionProperty(
> srcId, destId, property, expression)
> {
>
> to find out what happens.
>
> regards,
>
> Martin
>
> On 12/1/05, Matthias Kahlau <[EMAIL PROTECTED]> wrote:
> > Hi Rafael,
> >
> >
> > you're right, the JSF EL syntax must be used. The information on the
> > jsValueChangeListener Web page of the Apache MyFaces Web site seems
> > out-dated or obsolete:
> >
> > http://myfaces.apache.org/tomahawk/javascriptListener.html
> >
> > But despite of using the JSF EL syntax, the approach used to
> react to value
> > change events of radio button selections seems not to work. The
> first click
> > shows a reaction, setting false in the inputText. All following
> selections
> > doesn't change the inputText - true can never be set in the inputText,
> > although the selectOneRadio, which is the parent of the
> > jsValueChangeListener, has 4 radio buttons.
> >
> >
> > <t:jsValueChangeListener for="inputTextId"
> > property="value"
> > expressionValue="#{srcElem[2].checked ? 'true' :
> > 'false'}" />
> >
> >
> > Regards,
> > Matthias
> >
> > -----Ursprüngliche Nachricht-----
> > Von: [EMAIL PROTECTED]
> > [mailto:[EMAIL PROTECTED]
> > Auftrag von Rafael Nami
> > Gesendet: Donnerstag, 1. Dezember 2005 12:36
> > An: MyFaces Discussion
> > Betreff: Re: jsValueChangeListener - how to detect radio button
> selections
> >
> > Did you tried using #{srcElem[2].checked ? 'true' : 'false'} instead of
> > $srcElem[2].checked ? 'true' : 'false' ??
> >
> > Best Regards
> >
> > Rafael Mauricio Nami
> >
> > 2005/11/30, Matthias Kahlau <[EMAIL PROTECTED]>:
> > > Hi!
> > >
> > >
> > > I tried to use the t:jsValueChangeListener to react, when a
> specific radio
> > > button is selected or deselected, but got the following errors in the
> > > Firefox 1.0 JavaScript console (but didn't also work in
> Internet Explorer
> > > 6):
> > >
> > >
> > > uncaught exception: Error encountered : srcElem has no properties
> > > undefinedSource-Element id: _id1:ergPubBeginnRadios
> > > Source-element: null
> > > Type of source-element: object
> > >
> > >
> > > I used the following approach inside a selectOneRadio (with
> > > id="ergPubBeginnRadios") just to test:
> > >
> > > <t:jsValueChangeListener for="inputTextId"
> > > property="value"
> > > expressionValue="$srcElem[2].checked ?
> > 'true' : 'false'" />
> > >
> > >
> > > Does anybody know what's wrong?
> > >
> > >
> > > Regards,
> > > Matthias
> > >
> > >
> >
> >
>
>
> --
>
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