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  • Adding a markup filter
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{composition-setup} cloak.memory.duration = 3 {composition-setup}

Adding a markup filter

In some very rare cases it might be necessary to add an additional markup filter to the default list. Lets say you want to log a warning or throw an exception in case of an empty src attribute like <img src="">. The Image component is not able to handle it because the wicket id is missing. A markup filter in contrast iterates over all xml tags and is able to detect the problem and to throw an exception.

Note: a markup filter is not able to detect an AttributeModifier changing the src attribute to an empty string.

Wicket 1.4:

public class MyApplication extends Application { protected void init() { ... getMarkupSettings().setMarkupParserFactory( new MyMarkupParserFactory()); ... } } public class MyMarkupParserFactory implements IMarkupParserFactory { @Override public MarkupParser newMarkupParser(MarkupResourceStream resource) { MarkupParser parser = new MarkupParser(new XmlPullParser(), resource); parser.appendMarkupFilter(new MyMarkupFilter()); return parser; } }

It's maybe a good idea to allow your MarkupParserFactory accept a list of filters which might get appended on creation of the parser in 'newMarkupParser'.

Wicket 1.2:

public class MyApplication extends Application { protected void init() { IMarkupFilter filter = new HtmlProblemFinder(HtmlProblemFinder.ERR_THROW_EXCEPTION); getMarkupSettings().setMarkupParserFactory(new MarkupParserFactory(this, filter)); } }

Wicket 1.1

public class MyApplication extends Application { public MarkupParser newMarkupParser() { final MarkupParser parser = new MarkupParser(container, new XmlPullParser(settings.getDefaultMarkupEncoding()) { public void initFilterChain() { appendMarkupFilter(new HtmlProblemFinder(HtmlProblemFinder.ERR_THROW_EXCEPTION)); } } ); parser.configure(getSettings()); return parser; } }
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