How to keep expressions in HandleBars.Net for later evaluation?

Question

This seems to be a simple matter and maybe it's solved already, but I'm not sure how to do it. I'd like to keep arbitrary unresolved expressions for later evaluation. Note that I still don't know which expressions are already defined.

For example, suppose I have the expression...

{{source.path}}/mainmenu{{ext}}"

...and the context defines ext as .js, but source.path is still undefined. What I get is/mainmenu.js", but I'd like to get {{source.path}}/mainmenu.js" instead so that I can evaluate {{source.path}} at a later time. HandlebarsConfiguration.UnresolvedBindingFormatter seemed promising, but it doesn't handle the complete original expression. HandlebarsConfiguration.ExpressionNameResolver also didn't help.

So, is it possible to do this at all? Thanks in advance for any help.

Hi there, handlebars.net author here. At the time of this writing, that's not possible. Suggest you open an issue on Github or, even better, submit a pull request to add it! — Rex M
– Rex M, Commented Jul 27, 2019 at 1:36
I've requested the implementation of the "missing" hooks here. In Handlebarsjs we successfully used the "missingHelper" to implement what you need. — sferencik
– sferencik, Commented May 28, 2020 at 10:38
Thanks, @sferencik. I've moved to Nunjucks for some time now because I realized I neeed more powerful templates. Good to know that Handlebars is evolving. — Rubem Pechansky
– Rubem Pechansky, Commented May 28, 2020 at 14:12

Anton Marchanka · Accepted Answer · 2024-12-24 21:00:06Z

1

the easiest way to handle this issue is to set the default value of the variable as a variable name.

{ name: '{{source.path}}', value: some.real.value || '{{source.path}}' }

edited Dec 24, 2024 at 21:00

Anton Marchanka

5578 silver badges21 bronze badges

answered Dec 11, 2024 at 10:46

Anton Kameniev

111 bronze badge

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