custom Handlebars helper - parameter is not resolved

Question

# here is CreditCards controller context
{{#with controllers.currentCardCategory}}
  {{#each property in cardProperties}}
    {{#is property.symbol \'your_savings\'}         


        

Answer 1

I am not certain about the context of your code, but it seems like you are looking for registerBoundHelper with a block helper. This isn't supported. You will run into this warning,

Assertion failed: registerBoundHelper-generated helpers do not support use with Handlebars blocks.

An alternative way to do what you are doing is to use a view helper instead. A view helper is like a helper but can render with a custom template.

For instance a CardItemView would be,

App.CardItemView = Em.View.extend({
  templateName: 'cardItemTemplate'
});

Em.Handlebars.registerHelper('cardItem', App.CardItemView);

Where the cardItemTemplate is,

<script type='text/x-handlebars' data-template-name='cardItemTemplate'>
  {{#if view.property.symbol}}
    <td class="td">{{yourSavings}}</td>
  {{else}}
    <td class="td">{{cardProperty view.property.symbol}}</td>
  {{/if}}
</script>

And you could use the helper like so,

{{#with controllers.currentCardCategory}}
  {{#each property in cardProperties}}
    {{cardItem property=property etc}}
  {{/each}}
{{/with}}

You can pass in any number of properties as attributes. These will be bound to the CardItemView. And since it's a view anything a view does, like custom computed properties, can be done in CardItemView.