Question

When a new app is created, two views are main.html and index.html. main is never explicitly rendered, it is extended as

#{extends 'main.html' /}

How do I pass a variable to a view (main.html), when its only extended from another view (index.html)?

Answer 1

If it is passed to the render method, it will be available as per normal. The entire view, including extends and includes are rendered by the Groovy template engine.

However, in the case of the main.html which is usually extended on every view, the best option is to always add it to the renderArgs map using the @Before annotation, as follows. This ensure that it is always available, and you Do Not Repeat Yourself (DRY).

@Before
private void setup() {
    renderArgs.put("somekey", "somevalue");
}

This way, you don’t need to pass somekey into the render method on every render call.

Then, in your main.html, you can access somekey simply using the standard method of $somekey.