Trait handlebars::HelperDef [−] [src]

pub trait HelperDef: Send + Sync {
    fn call(&self, ctx: &Context, h: &Helper, r: &Registry, rc: &mut RenderContext) -> Result<(), RenderError>;
}

Helper Definition

Implement HelperDef to create custom helper. You can retrieve useful information from these arguments.

  • &Context: the context you are rendering
  • &Helper: current helper template information, contains name, params, hashes and nested template
  • &Registry: the global registry, you can find templates by name from registry
  • &mut RenderContext: you can store variables (starts with @) in render context, for example, @index of #each.

By default, you can use bare function as helper definition because we have supported unboxed_closure. If you have stateful or configurable helper, you can create a struct to implement HelperDef.

Required Methods

Implementors