onchange control visibility according to multiple controls values

[Entropy <bl...@gmail.com>]

I have a requirement to control the visibility of some controls and the
enabling of others based on certain legal combinations of values of various
controls on the page.  I attached AjaxEventBehaviors to each control that is
needed as input to this, but it seems like the values are other controls
aren't included, which is not terribly surprising.

How can I get wicket to supply those values so I can make the decision of
what to enable/show/hide/disable?

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Re: onchange control visibility according to multiple controls values

[Sebastien <se...@gmail.com>]

Hi,

Maybe you need to look at the Event Bus, This will ease the communication
between components and you will be able to supply a payload with your
desired info/value/object...

https://wicket.apache.org/guide/guide/single.html#advanced_2
(Wicket events infrastructure)

Hope this helps,
Sebastien.

Re: onchange control visibility according to multiple controls values

[mscoon <ms...@gmail.com>]

Hi,

This is kind of tricky.

What you need is to attach AjaxFormSubmitBehavior's to the components that
trigger changes, so that the entire form is submitted whenever a control's
value changes. Then you can access the other controls' values through the
form's model.

The tricky part is that if some components have been marked as required or
have validators, if these cheeks do not pass, their model won't be updated
and you will get the last valid model value for those and not the current
user input.

So what I usually end up doing in situations like this is not mark any
components as required and have all validation run in
form.onModelValidating(). This has the effect that the
AjaxFormSubmitBehavior's always (actually almost always, see below) update
the form's model and the entire model is synchronized with the user's input
at all times.

The "almost always" above is because if the user's input violates the
component's data type (e.g. if you have an Integer TextField and the user
types in some alphanumeric string) then the component's model is not
updated when you submit the entire form. In this case you need to
handle/show the component's error.

Perhaps someone has a better solution. Perhaps using simple
AjaxFormComponentUpdatingBehavior's customized to also post the values of
some additional controls will work better, I am not sure. I have not
investigated this path as the approach I described above is a server-side
solution that works.

Marios

On Wed, Apr 1, 2015 at 2:08 AM, Entropy <bl...@gmail.com> wrote:

> I have a requirement to control the visibility of some controls and the
> enabling of others based on certain legal combinations of values of various
> controls on the page.  I attached AjaxEventBehaviors to each control that
> is
> needed as input to this, but it seems like the values are other controls
> aren't included, which is not terribly surprising.
>
> How can I get wicket to supply those values so I can make the decision of
> what to enable/show/hide/disable?
>
> --
> View this message in context:
> http://apache-wicket.1842946.n4.nabble.com/onchange-control-visibility-according-to-multiple-controls-values-tp4670130.html
> Sent from the Users forum mailing list archive at Nabble.com.
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@wicket.apache.org
> For additional commands, e-mail: users-help@wicket.apache.org
>
>