To validate a form component after page load add the following to the page
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...
protected void onBeforeRender()
{
super.onBeforeRender();
visitChildren(FormComponent.class, new IVisitor()
{
public Object component(Component component)
{
FormComponent formComponent = (FormComponent) component;
if (formComponent.isRequired())
{
// This can be any validator
formComponent.error((IValidationError)new ValidationError().addMessageKey("Required"));
}
return IVisitor.CONTINUE_TRAVERSAL_BUT_DONT_GO_DEEPER;
}
});
}
...
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