@converter([EL-expression], [arbitraryKey]=[EL-expression])
Target Attribute: any (except viewModel, validationMessages, form, and event attributes)
Purpose: It should be used with @bind, @load, @save. It applies a converter to convert data during transformation between UI components and ViewModel.
The evaluation result of EL expression should be a Converter object. You can append arbitrary arguments in key-value pair with a comma for separation to pass it to the Converter object. Built-in Converter is referenced by a string literal as its name.
[arbitraryKey]=[EL-expression]
Basically, it uses key-value pairs. You can write multiple key-value pairs with different key names.
An EL expression without a key is set to a default key named "value" implicitly.
Since each annotation has different functions, some annotations may ignore key-value pair expressions other than the default key, e.g.@id.
[arbitraryKey]
It could be any name. It's used as a key for parameter related Java annotation in a ViewModel.
<label value="@load(item.price) @converter('formatedNumber', format='###,##0.00')"/><label value="@load(vm.selected.totalPrice) @converter(vm.totalPriceConverter)"/>