Package ratpack.handlebars

Interface NamedHelper<T>

  • Type Parameters:
    T - The context object type.
    All Superinterfaces:
    com.github.jknack.handlebars.Helper<T>
    public interface NamedHelper<T>
extends com.github.jknack.handlebars.Helper<T>
    Implementations of this interface bound with Guice will be automatically registered as handlebars helpers. 
    
 import com.github.jknack.handlebars.Options;
 import ratpack.guice.Guice;
 import ratpack.handlebars.HandlebarsModule;
 import ratpack.handlebars.NamedHelper;
 import ratpack.test.embed.EphemeralBaseDir;
 import ratpack.test.embed.EmbeddedApp;

 import java.io.IOException;
 import java.nio.file.Path;

 import static ratpack.handlebars.Template.handlebarsTemplate;
 import static org.junit.jupiter.api.Assertions.*;

 public class Example {

   public static class HelloHelper implements NamedHelper<String> {
     public String getName() {
       return "hello";
     }

     public CharSequence apply(String context, Options options) throws IOException {
       return "Hello " + context.toUpperCase() + "!";
     }
   }

   public static void main(String... args) throws Exception {
     EphemeralBaseDir.tmpDir().use(baseDir -> {
       baseDir.write("handlebars/myTemplate.html.hbs", "{{hello \"ratpack\"}}");
       EmbeddedApp.of(s -> s
         .serverConfig(c -> c.baseDir(baseDir.getRoot()))
         .registry(Guice.registry(b -> b
           .module(new HandlebarsModule())
           .bind(HelloHelper.class)
         ))
         .handlers(chain -> chain
           .get(ctx -> ctx.render(handlebarsTemplate("myTemplate.html")))
         )
       ).test(httpClient -> {
         assertEquals("Hello RATPACK!", httpClient.getText());
       });
     });
   }
 }

    • Method Detail