How to check for empty-string, null or white-spaces in handlebar?

Question

I need to check for null values, empty-strings and strings with whitespaces only and substitute them with "No Content".

I tried this but it worked only for null and empty string not for whitespaces-only strings.

{{#if value}}
    {{value}}
{{else}}
    <p>No Content</p>
{{/if}}

How to do it? Is helpers the only option?

Answer 1

This is a useful Helper.

Handlebars.registerHelper('check', function(value, comparator) {
    return (value === comparator) ? 'No content' : value;
});

Tests template

{{#check value ""}}
  {{this}}
{{/check}}

{{#check value null}}
  {{this}}
{{/check}}

{{#check value undefined}}
  {{this}}
{{/check}}