THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
It's common to want the user to confirm his action if it would be hard to reverse, e.g. if he asked to delete something. The confirmation can be easily obtained via a javascript confirm dialog box. If you'd rather not use javascript, another approach is outlined below.
Using Javascript
Wicket 6.x
This is a solution from Sven Meier - 'overwrite #updateAjaxAttributes in your behavior or AjaxLink'. To make a reusable Component, simply create an abstract base class:
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public abstract class ConfirmationLink<T> extends AjaxLink<T>
{
private static final long serialVersionUID = 1L;
private final String text;
public ConfirmationLink( String id, String text )
{
super( id );
this.text = text;
}
@Override
protected void updateAjaxAttributes( AjaxRequestAttributes attributes )
{
super.updateAjaxAttributes( attributes );
AjaxCallListener ajaxCallListener = new AjaxCallListener();
ajaxCallListener.onPrecondition( "return confirm('" + text + "');" );
attributes.getAjaxCallListeners().add( ajaxCallListener );
}
}
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Earlier Wicket versions
Here's one way to do get confirmation, using Javascript:
...
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public class JavascriptEventConfirmation extends AttributeModifier {
public JavascriptEventConfirmation(String event, String msg) {
super(event, true, new Model(msg));
}
protected String newValue(final String currentValue,
final String replacementValue) {
String resultprefix = "returnvar conf = confirm('" + replacementValue + "'); " +
"if (!conf) return false; ";
String result = prefix;
if (currentValue != null) {
result = currentValueprefix + "; " + resultcurrentValue;
}
return result;
}
}
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Then we attach the modifier to the link:
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abstract public class ConfirmLink extends Link {
public ConfirmLink(String id, String msg) {
super(id);
add(new JavascriptEventConfirmation("onclick", "are you sure?"));
}
@Override
abstract public void onClick();
}
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(The subclass could of course use SimpleAttributeModifier instead.)
...