Verify the presence of a boolean false value in mustache.js

As stated in this particular query, the method of checking for false within a json object passed to a mustache template is as follows:

{{^like}}
    it is false
{{/like}}
{{#like}}
    it is true
{{/like}}

Assuming our json data appears like this {"like":true}

However, experimenting with this on the official Mustache demo page does not yield the anticipated results. The resulting html code looks like this:

it is true
it is false
{{/like}}

What could be causing the issue when utilizing {{^whatever}} within your template? Is this not the correct approach to verifying false?

jsontemplatesbooleanmustache

Answer №1

The inverted sections (^) feature is included in the Mustache github, but unfortunately, the MustacheDemoIO uses an outdated version of the library that does not support it. In the old code snippet provided:

// for each {{#foo}}{{/foo}} section do...
  return template.replace(regex, function(match, name, content) {
    var value = that.find(name, context);
    if(that.is_array(value)) { // Enumerable, Let's loop!
      return that.map(value, function(row) {
        return that.render(content, that.merge(context,
                that.create_context(row)), partials, true);
      }).join("");
    } else if(value) { // boolean section
      return that.render(content, context, partials, true);
    } else {
      return "";
    }
  });

However, there is no support for {{^foo}} {{/foo}} in the old version. This causes issues with your example.

Fortunately, this should not be a significant concern because the latest version available on the Mustache github includes this functionality.

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