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up vote 2 down vote favorite

I'm trying to use the following 'with' binding in knockout:

<td data-bind="with: $data.tiers()[$parents[1].Index]">
    ...
</td>

But I'm getting the error "Unexpected token );". If I just use $data.tiers()[0] it works, and I know that $parents[1].Index evaluates to a number. Is this just a limitation of knockout, that you can't use nested index accessors?

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Which KO version are you using? Can you try it with the latest 3.0 RC version knockoutjs.com/downloads/knockout-3.0.0rc.js? –  nemesv Oct 15 '13 at 13:59
    
I'm using 2.2.1. I just tried 3.0 RC, but it broke a whole host of other stuff, so I think I'll give that a miss. :P –  Tom Oct 15 '13 at 14:09
2  
Every day I see people here at SO that put alot of code in the View, it makes me sad because it defeats the purpose of MVVM –  Anders Oct 15 '13 at 14:29
    
Yeah, I am trying to minimise the code as much as I can, but it's quite a complex view, so it's quite hard to avoid. I'm fairly new to KO as well. –  Tom Oct 15 '13 at 14:42
2  
This is a known issue: ko.expressionRewriting.preProcessBindings failing at array expressions which should be fixed in version 3.0. You can find a possible workaround in the linked github issue. –  nemesv Oct 15 '13 at 14:52

1 Answer 1

up vote 0 down vote

This is a known issue: ko.expressionRewriting.preProcessBindings failing at array expressions which was be fixed in KO version 3.0.

If you cannot upgrade to 3.0 you can find a possible workaround in the linked github issue, so you just need to change your expression to:

<td data-bind="with: ($data.tiers()[$parents[1].Index])">
    ...
</td>

Demo JSFiddle.

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