Thanks to all for your help and suggestions.
I wrote an AjaxFallbackSubmitButton component as Igor suggested. It
inherits from Button and checks if javascript is enabled in the
onSubmit() (non-ajax) method. There it can decide whether to call
onSubmit(AjaxRequestTarget,Form) with null parameters (js not enabled),
or do nothing because the onSubmit(AjaxRequestTarget,Form) will be
called by ajax.
I used
((WebClientInfo)getSession().getClientInfo()).getProperties().getBoolean(ClientProperties.NAVIGATOR_JAVA_ENABLED)
to check if javascript is enabled, but it throws a
RestartResponseAtInterceptPageException when it is called for the first
time (thrown from WebRequestCycle.newClientInfo()), and then a blank
page is shown. There's a message 'If you see this, it means that both
javascript and meta-refresh are not support by your browser
configuration. Please click here to continue to the original
destination' . Anyone knows why is this? I'm using wicket 1.2.3. Firefox
2. javascript is enabled.
(I am doing getRequestCycleSettings().setGatherExtendedBrowserInfo(true)
in my application init() method, as indicated by Eelco.)
Anyone knows why this might be happening? Any way to prevent that page
from showing? Otherwise it works.
This is the class:
/**
* Ajax submit button that can fallback to a normal request if
javascript is not enabled.
* It checks if javascript is enabled calling
* <code>new WebClientInfo((WebRequestCycle)
getRequestCycle()).getProperties().getBoolean(ClientProperties.NAVIGATOR_JAVA_ENABLED)</code>
* When javascript is not enabled, the methods
onSubmit(AjaxRequestTarget, Form) is
* called with null parameters.
*
* This class goal is to combine the behavior of a an AjaxSubmitButton
with fallback behavior if js is not present.
*
* @author flavia.paganelli
*
*/
public abstract class AjaxFallbackSubmitButton extends Button {
public AjaxFallbackSubmitButton(String id, final Form form) {
super(id);
add(new AjaxFormSubmitBehavior(form, "onclick")
{
private static final long serialVersionUID = 1L;
protected void onSubmit(AjaxRequestTarget target)
{
AjaxFallbackSubmitButton.this.onSubmit(target, form);
}
protected void onError(AjaxRequestTarget target)
{
AjaxFallbackSubmitButton.this.onError(target, form);
}
protected CharSequence getEventHandler()
{
return new
AppendingStringBuffer(super.getEventHandler()).append("; return false;");
}
protected IAjaxCallDecorator getAjaxCallDecorator()
{
return new
CancelEventIfNoAjaxDecorator(AjaxFallbackSubmitButton.this
.getAjaxCallDecorator());
}
});
}
/**
* Returns the [EMAIL PROTECTED] IAjaxCallDecorator} that will be used to
modify the
* generated javascript. This is the preferred way of changing the
* javascript in the onclick handler
*
* @return call decorator used to modify the generated javascript or
null
* for none
*/
protected IAjaxCallDecorator getAjaxCallDecorator()
{
return null;
}
protected void onComponentTag(ComponentTag tag)
{
checkComponentTag(tag, "input");
final String type = tag.getAttributes().getString("type");
if (!"button".equals(type) && !"image".equals(type) &&
!"submit".equals(type))
{
findMarkupStream().throwMarkupException(
"Component " + getId() + " must be applied to a tag
with 'type'"
+ " attribute matching 'submit', 'button' or
'image', not '" + type
+ "'");
}
super.onComponentTag(tag);
}
/**
* Listener method invoked on form submit with no errors
*
* @param target
* @param form
*/
protected abstract void onSubmit(AjaxRequestTarget target, Form form);
/**
* Listener method invoked on form submit with errors
*
* @param target
* @param form
*
*/
protected void onError(AjaxRequestTarget target, Form form) {
}
/**
* If javascript is not enabled, the method onSubmit() is called
with null values as parameters.
* Otherwise, this method does nothing.
*/
@Override
protected void onSubmit() {
if (!isJavascriptEnabled()) {
// call the ajax onSubmit method with target = null only if
java is disabled
onSubmit(null, null);
}
}
private boolean isJavascriptEnabled() {
return
((WebClientInfo)getSession().getClientInfo()).getProperties().getBoolean(ClientProperties.NAVIGATOR_JAVA_ENABLED);
}
}
I'd like to understand why that page is shown the first time I try to
access the properties (when the newClientInfo() method is called). For
the rest, I guess the class works ok...
saludos,
Flavia
From: "Igor Vaynberg" <[EMAIL PROTECTED]>
you say you want it to work even if javascript is disabled, but then you
cannot submit the form using a link! so you have to user a button to
submit
it, and that is easy then, just look at the sourcecode from
AjaxFallbackLink
and add the ajax behavior to a button instead of a link.
-igor
On 1/30/07, Flavia Paganelli <[EMAIL PROTECTED]> wrote:
> >
> > Hi!
> >
> > I'm working on a page that provides ajax behavior but also supports
> > simple request-response without javascript.
> > I realized I need a component that provides the behavior of both
> > AjaxFallbackLink and AjaxSubmitLink at the same time. On one hand I need
> > it to be a submit link, because on click it has to access the data
> > entered by the user. And on the other hand I also would like that my
> > form worked even when javascript is not enabled.
> >
> > Both requirements don't seem so odd, so I wonder if someone already had
> > the same problem and found a solution for it. I've been looking at the
> > classes to try to implement a new component with this characteristics,
> > but I got lost.
> >
> > Maybe there is an alternative solution that I'm not seeing...
> >
> > Any help will be very much appreciated.
> >
> > saludos,
> >
> > Flavia
> >
> >
--
Flavia Paganelli
Func. Internet Integration
W http://www.func.nl
T +31 20 4230000
F +31 20 4223500
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