Array has at least 1 item - Dust.js

Question

I'm looking for a clever way in dust.js to determine if an array of objects (let's say items) has at least one item preferably without using @if or looping through every item

It would be nice if this worked, but it doesn't :(

{@size key=items}
    {@gt value=0}
        asdf
    {/gt}
{/size}

It's actually an empty object, not an array but still having the issue — mbuff24
– mbuff24, Commented Jan 17, 2014 at 15:45

rashad · Accepted Answer · 2014-01-20 09:28:48Z

1

I've created an issue with the same requirement. Typically you should create an alternative helper which should accept inner blocks, and this helper will internally call @size helper.

Let's name it @sizeOf:

dust.helpers.sizeOf = function(chunk, context, bodies, params) {
  var value = this.size(chunk, context, bodies, params);
  return (bodies && bodies.block) ? chunk.render(bodies.block, context.push({ isSelect: true, isResolved: false, selectKey: value })) : value;
};

And we should use it like this:

{@sizeOf key=items}
  {@gt value=0}
    asdf
  {/gt}
{/size}

answered Jan 20, 2014 at 9:28

rashad

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1 Comment

mbuff24 Over a year ago

This is awesome, I didn't think of a dust helper. I ended up using explicit arrays at the data level so I can use the simple {?data}{/data} check

Deniz Ozger · Accepted Answer · 2014-04-23 22:38:08Z

1

Assuming items is an empty array, this should work:

{?items}
    {#items}
        ...
    {/items}    
{:else}
    There are no results
{/items}

answered Apr 23, 2014 at 22:38

Deniz Ozger

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