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java |
| title |
HelloWorld.java |
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package org.example.myapp.components;
public class HelloWorld
{
}
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<html>
Bonjour from HelloWorld component.
</html>
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|
java |
| title |
HelloWorld.java -- without a template |
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package org.example.myapp.components;
import org.apache.tapestry5.MarkupWriter;
import org.apache.tapestry5.annotations.BeginRender;
public class HelloWorld
{
@BeginRender
void renderMessage(MarkupWriter writer)
{
writer.write("Bonjour from HelloWorld component.");
}
}
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Be aware that you will need to provide getter and setter methods to access your classes' instance variables. Tapestry does not do this automatically unless you provide the @Property annotation on the field.
| since |
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Since release 5.3.2, instance variables may be protected, or package private (that is, no access modifier). Under specific circumstances they may even be public (public fields must either be final, or have the @[Retain|http://tapestry.apache.org/current/apidocs/org/apache/tapestry5/annotations/Retain.html] annotation).
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Injection of dependencies occurs at the field level, via additional annotations. At runtime, fields that contain injections become read-only.
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@Inject // inject a resource
private ComponentResources componentResources;
@Inject // inject a block
private Block foo;
@Inject // inject an asset
@Path("context:images/top_banner.png")
private Asset banner;
@Inject // inject a service
private AjaxResponseRenderer ajaxResponseRenderer;
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You can define the type of component inside template, or you can create an instance variable for the component and use the @Component annotation to define the component type and parameters.
Example:
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package org.example.app.pages;
import org.apache.tapestry5.annotations.Component;
import org.apache.tapestry5.annotations.Property;
import org.example.app.components.Count;
public class Countdown
{
@Component(parameters =
{ "start=5", "end=1", "value=countValue" })
private Count count;
@Property
private int countValue;
}
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Component Classes 