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.
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}}
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 "You can change context of the block
{{#with newContext}} ... {{/with}}
// or
{{#with newContextVar=oldContextVar}} ... {{/with}}
// or both
{{#with newContext var1=oldVar1 var2=oldVar2}} ... {{/with}}
Returns value, that matches one of hash key or default value
{{switch conditionVar X='val1' Y=var1 default='default value'}}
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}}
Convert new lines (\r\n, \n\r, \r, \n) to line breaks
{{nl2br description}}
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