just add a behavior to the link which ads a javascript 'onclick':
public class JavascriptEventConfirmation
extends AttributeModifier
{
private static final long serialVersionUID = 1L;
public JavascriptEventConfirmation( final String event, final String msg )
{
super( event, true, new Model( msg ) );
}
@Override
protected String newValue( final String currentValue, final String
replacementValue )
{
if( currentValue != null && currentValue.length() != 0 )
{
StringBuilder result = new StringBuilder( 256 );
result.append( "if( confirm('" );
result.append( escape( replacementValue ) );
result.append( "') ){" );
result.append( currentValue );
result.append( "} else return false;" );
return (result.toString());
}
else
{
return ("return confirm('" + escape( replacementValue ) + "')");
}
}
private String escape( final String text )
{
if( text == null )
{
return (null);
}
return (text.replaceAll( "\"", """ ));
}
}
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