I'm having trouble getting Handlebars helpers to function properly with arguments on MeteorJS

Question

I'm having trouble getting Handlebars helpers to function properly with arguments on MeteorJS

I'm attempting to utilize a basic handlebars helper, with arguments, in the framework of MeteorJS.

Allow me to provide an example:

{{#myList data className="myClassName"}}
  {{name}}
{{/myList}}

The helper function is defined as follows:

Handlebars.registerHelper('myList', function(context, options) {
  if (context && context.length){
    var className = options.hash.className || "", 
       ret = "<ul class='"+ className +"'>";

    for(var i=0, j=context.length; i<j; i++) {
      ret = ret + options.fn(context[i]);
    }

    return ret + "</ul>";
  }
});

However, the "hash" property always seems to be an empty array.

If I try a version like this one:

{{#myList data "myClassName"}}
  {{name}}
{{/myList}}

The callback method never seems to receive the second argument.

Could there be something amiss in my approach?

javascript meteor handlebars.js

Answer 1

Answer №1

According to information found on meteor/handlebars:

In the context of Meteor, block helpers differ from non-block helpers in that they do not accept random positional and keyword arguments. Instead, all the arguments are considered as a nested Handlebars helper invocation expression.

However, it is still possible to pass only keyword arguments:

The specific condition for invoking a block helper is that it can have no arguments, one positional argument (without any keyword arguments), or solely keyword arguments. If there is any non-keyword argument present, such as 'foo' in the example above, then all subsequent positional and keyword arguments will be passed to 'foo' (if it's a function) or disregarded. On the other hand, if only keyword arguments exist, they will be passed to the helper, allowing you to create a block helper that accepts multiple arguments by assigning them names: {{#helper x=1 y=2 z=3}}...{{/helper}}.

The following code snippet should function correctly:

{{#myList myData=data className="myClassName"}}
  {{name}}
{{/myList}}

Answer 2

According to information found on meteor/handlebars:

In the context of Meteor, block helpers differ from non-block helpers in that they do not accept random positional and keyword arguments. Instead, all the arguments are considered as a nested Handlebars helper invocation expression.

However, it is still possible to pass only keyword arguments:

The specific condition for invoking a block helper is that it can have no arguments, one positional argument (without any keyword arguments), or solely keyword arguments. If there is any non-keyword argument present, such as 'foo' in the example above, then all subsequent positional and keyword arguments will be passed to 'foo' (if it's a function) or disregarded. On the other hand, if only keyword arguments exist, they will be passed to the helper, allowing you to create a block helper that accepts multiple arguments by assigning them names: {{#helper x=1 y=2 z=3}}...{{/helper}}.

The following code snippet should function correctly:

{{#myList myData=data className="myClassName"}}
  {{name}}
{{/myList}}

I'm having trouble getting Handlebars helpers to function properly with arguments on MeteorJS

Answer №1

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