Accessing array/object variables by key, within a handlebars mustache

Question

I can't seem to find a way of doing this, and have tried subexpressions and various other answers posted on StackOverflow - but they all seem to assume that I know the key I'm using in advance.

I have the following object:

{
    fields: {
        1: {
            complete: 1,
            submitted: 0
        },
        2: {
            complete: 1,
            submitted: 0
        }
}

etc. etc.

In my Handlebars template, I'm looping through an array of objects. Each object in that array has a field_id key which is a number that matches up to the 1 or 2 in the above example.

I need to access the variables in the above array structure, based on the current field_id being looped. I've tried:

{{fields[(field_id)].complete}}

{{fields[{{field_id}}].complete}}

{{fields.(field_id).complete}}

{{fields.({{field_id}}).complete}}

And none of them work.

Is there a way of doing this?

Where does field_id come from?

76484
– 76484

2016-09-03 20:23:47 +00:00
Commented Sep 3, 2016 at 20:23 — 76484
– 76484, Commented Sep 3, 2016 at 20:23

76484 · Accepted Answer · 2016-09-03 20:59:47Z

1

I would not create a custom helper for this. Instead, I would use the existing Lookup helper partnered with the with block helper:

{{#with (lookup fields field_id) as |field|}}
    {{field.complete}}
{{/with}}

Alternatively you could use the lookup helper with a subexpression:

{{lookup (lookup fields field_id) 'complete'}}

answered Sep 3, 2016 at 20:59

76484

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1 Comment

gazchap Over a year ago

I used the latter solution here, much neater than my custom helper. Thank you muchly!

gazchap · Accepted Answer · 2016-09-03 14:43:06Z

0

I made this work by registering a custom helper:

Handlebars.registerHelper( 'getfield', function ( data, field_id, key ) {
    var val = ( data[ field_id ] ) ? data[ field_id ][ key ] : '';
    return val;
} );

and then made use of this in my templates with:

{{getfield fields field_id 'complete'}}

answered Sep 3, 2016 at 14:43

gazchap

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