Handlepers

A small collection of usefull helpers collection for express-hbs and Handlebars.js.

Forked from danharper/Handlebars-Helpers

To use, just include helpers.js after you include Handlebars. Or, if you're using AMD/Node, just require the file.

Provided Helpers

Comparisons

Given one argument, is acts exactly like if:

{{#is x}} ... {{else}} ... {{/is}}

Given two arguments, is compares the two are equal (a non-strict, == comparison, so 5 == '5' is true)

{{#is x y}} ... {{else}} ... {{/is}}

Given three arguments, the second argument becomes the comparator.

{{#is x "not" y}} ... {{else}} ... {{/is}}
{{#is 5 ">=" 2}} ... {{else}} ... {{/is}}

Several comparators are built-in:

• == (same as not providing a comparator)
• !=
• not (alias for !=)
• ===
• !==
• >
• >=
• <
• <=
• in (check a value exists in either a comma-separated string, or an array, see below)

// Loose equality checking
{{#is x y}} ... {{else}} ... {{/is}}
{{#is x "==" y}} ... {{else}} ... {{/is}}

{{#is x "!=" y}} ... {{else}} ... {{/is}}
{{#is x "not" y}} ... {{else}} ... {{/is}}

// Strict equality checking
{{#is x "===" y}} ... {{else}} ... {{/is}}
{{#is x "!==" y}} ... {{else}} ... {{/is}}

// Greater/Less Than
{{#is x ">" y}} ... {{else}} ... {{/is}}
{{#is x ">=" y}} ... {{else}} ... {{/is}}

{{#is x "<" y}} ... {{else}} ... {{/is}}
{{#is x "<=" y}} ... {{else}} ... {{/is}}

// In comma separated list, or array
{{#is x "in" "foo,bar"}} ... {{else}} ... {{/is}}
{{#is x "in" anArray}} ... {{else}} ... {{/is}}

Registering Custom is comparators

You can extend the provided comparators by registering your own, like so:

// in browser
HandlebarsHelpersRegistry.add('same', function (left, right) { return left === right; });

// with AMD/Node
var HandlebarsHelpersRegistry = require('path/to/helpers');
HandlebarsHelpersRegistry.add('same', function (left, right) { return left === right; });

// usage
var template = '{{#is x "same" y}} Are the same {{else}} Not the same {{/is}}';
Handlebars.compile(template)({ x: 5, y: '5' }); // => " Not the same "

With

You can change context of the block

{{#with newContext}} ... {{/with}}
// or
{{#with newContextVar=oldContextVar}} ... {{/with}}
// or both
{{#with newContext var1=oldVar1 var2=oldVar2}} ... {{/with}}

Switch

Returns value, that matches one of hash key or default value

{{switch conditionVar X='val1' Y=var1 default='default value'}}

Logging

Log one or multiple values to the console:

{{log foo bar}}

Log one or multiple values to the console, with the current context:

{{debug foo bar}}

nl2br

Convert new lines (\r\n, \n\r, \r, \n) to line breaks

{{nl2br description}}

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