Question: how to use the non-global viewmodel in an {{IF}} block?

[scottmessinger]

How do I use the non-global viewmodel in an {{IF}} block? For instance, in the code below, nested_children is a property on the unit view model, not the global view model. How do I get it to work?

  {{if nested_children == false}}
    <p> stuff </p>
  {{else}}
    <p> other stuff </p>
  {{/if}}

Thanks! Scott

[hunterloftis]

Scott,

I can't speak directly to your problem because I've avoided messing with templating in KO too much (it's implemented in a complicated way, imho).

A workaround for your example that might let you avoid headaches is:

<p data-bind-namespace='visible: (nested_children() === false)'> stuff </p>
<p data-bind-namespace='visible: (nested_children() === true)'> other stuff </p>

In some cases, since namespacing is not part of the core design of KO, it can be like fitting a square peg into a round hole. I have considered implementing templating such that all templates would 'inherit' the namespace that called them. For example, you might use data-bind-namespace='template...' and then within the template data-bind='stuff' would automatically be bound to 'namespace.' That has the potential to avoid a lot of the complexity of KO templating, and could probably provide the right context for your issue above (using template statements like 'if').

Would that work within your application?

[scottmessinger]

Thanks for reply.

RE: data-bind-namesapce : "template ...' I thought that's how it worked now. At least, that how it seems to work. However, I've found that within that template, I can't pass templateOptions to any subtemplates.

RE: KO templating.... I see you're working on okay.js. How is that coming? Does it make templating simpler? Also, what do you think of DOMJuice? It seems like knockout.js for backbone.js...potentially a winning combination.

[scottmessinger]

A couple things...

"However, I've found that within that template, I can't pass templateOptions to any subtemplates." I found the problem: I wasn't putting a space between my curly braces }} !== } }.

Based on your comments, I've decided to just namespace my viewmodels within the master view model. It's easier and accomplishes the same goal without the hassle.

Thanks!