In Wicket, you can access or manipulate the HTML tag easily. Let say, you have a HTML text box component and wrap by a div tag, and the div tag should be highlighted in error color if textbox validation is failed.

In above case, you can implement “AbstractBehavior” class, to add attribute to a HTML tag dynamically. See following example,

Original HTML

<div wicket:id="wicket_id_test">
    Hello ~ Wicket leaning curve is high, do you?
</div>

Modify with Wicket AbstractBehavior

    WebMarkupContainerWithAssociatedMarkup divtest = 
        new WebMarkupContainerWithAssociatedMarkup("wicket_id_test");
 
    //validation failed , add AbstractBehavior to the div test container
    divtest.add(new AbstractBehavior() {
 
	    public void onComponentTag(Component component, ComponentTag tag) {
			tag.put("style", "background-color:red");
	    }
	});

Result like this :

<div wicket:id="wicket_id_test" style="background-color:red">
    Hello ~ this is testing for adding attribute into above tag in Wicket ~
</div>
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[ Read More ] You can find more similar articles at Apache Wicket Tutorials