handlebars-helpers

Tons of awesome helpers for Handlebars

This library is used for templates in Wirechunk.

Browsers are supported

Though this is a fork of helpers/handlebars-helpers, this package only has helpers that work both in Node.js and in browsers.

See how to use handlebars-helpers in the browser.

Usage

Install this library:

npm install useful-handlebars-helpers

The main file (index.js) exports groups of helpers. See it for a list of all the groups.

Import the groups you want and register each as a helper:

import handlebars from 'handlebars';
import { array, collection, math, number } from 'useful-handlebars-helpers';

[array, collection, math, number].forEach(
  (helper) => {
    Handlebars.registerHelper(helper);
  },
);

You need to have Handlebars as a dependency yourself: it is declared as a peer dependency here.

Also, if you use syntax highlighting when rendering Markdown to HTML with the helper-markdown module, you need to have highlight.js as a dependency yourself; it too is a peer dependency here.

Helper categories

Currently 150 helpers in 17 categories:

All helpers

abs (code | [no tests])
add (code | tests)
avg (code | [no tests])
ceil (code | tests)
divide (code | tests)
floor (code | tests)
multiply (code | tests)
random (code | tests)
remainder (code | tests)
round (code | tests)
subtract (code | tests)
sum (code | tests)

Misc helpers

Visit the: code | unit tests | issues

option (code | tests)
noop (code | tests)
typeOf (code | [no tests])
withHash (code | tests)

Number helpers

Visit the: code | unit tests | issues

bytes (code | tests)
addCommas (code | tests)
phoneNumber (code | tests)
toAbbr (code | tests)
toExponential (code | tests)
toFixed (code | tests)
toFloat (code | tests)
toInt (code | tests)
toPrecision (code | tests)

Object helpers

Visit the: code | unit tests | issues

extend (code | tests)
forIn (code | tests)
forOwn (code | tests)
toPath (code | tests)
get (code | tests)
getObject (code | tests)
hasOwn (code | tests)
isObject (code | tests)
JSONparse (code | tests)
JSONstringify (code | tests)
merge (code | tests)
pick (code | tests)

Path helpers

Visit the: code | unit tests | issues

dirname (code | tests)
relative (code | tests)
basename (code | tests)
stem (code | tests)
extname (code | tests)
segments (code | tests)

Regex helpers

Visit the: code | unit tests | issues

toRegex (code | [no tests])
test (code | [no tests])

String helpers

Visit the: code | unit tests | issues

append (code | [no tests])
camelcase (code | tests)
capitalize (code | tests)
capitalizeAll (code | tests)
center (code | tests)
chop (code | tests)
dashcase (code | tests)
dotcase (code | tests)
ellipsis (code | tests)
hyphenate (code | tests)
isString (code | tests)
lowercase (code | tests)
occurrences (code | tests)
pascalcase (code | tests)
pathcase (code | tests)
plusify (code | tests)
prepend (code | [no tests])
raw (code | [no tests])
remove (code | [no tests])
removeFirst (code | [no tests])
replace (code | tests)
replaceFirst (code | [no tests])
sentence (code | tests)
snakecase (code | tests)
split (code | tests)
startsWith (code | tests)
titleize (code | tests)
trim (code | tests)
trimLeft (code | [no tests])
trimRight (code | [no tests])
truncate (code | tests)
truncateWords (code | [no tests])
uppercase (code | tests)

URL helpers

Visit the: code | unit tests | issues

decodeURIComponent (code | tests)
encodeURIComponent (code | tests)
urlResolve (code | tests)
urlParse (code | tests)
stripQuerystring (code | tests)

array

after

Returns all of the items in an array, or characters in a string, after the specified index.

Params

array {Array|String}: Collection
n {Number}: Starting index (number of items to exclude)
returns {Array|String}: Array or string excluding n items.

Example

<!-- array: ['a', 'b', 'c'] -->
{{after array 1}}
<!-- results in: '["c"]' -->

<!-- str: "abcd" -->
{{after str 2}}
<!-- results in: 'cd' -->

eachIndex

Params

array {Array}
options {Object}
returns {String}

Example

<!-- array: ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h'] -->
{{#eachIndex array}}
  {{item}} is {{index}}
{{/eachIndex}}

filter

Returns an array with the given array's elements filtered for elements that equal a specified value or, if a hash argument with a "property" key is provided, for elements that have the specified property equal to a specified value.

Params

array {Array}
value {any}
options {Object}
returns {Array}

Example

<!-- array: ['a', 'b', 'a', 'c'] -->
{{filter array "a"}}
<!-- results in: ['a', 'a'] -->

<!-- array: [{ x: 'a' }, { x: 'b' }, { x: 'a' }, { x: 'c' }] -->
{{filter array "a" property="x"}}
<!-- results in: [{ x: 'a'}, { x: 'a' }] -->

first

Returns the first item, or first n items of an array.

Params

array {Array}
n {Number}: Number of items to return, starting at 0.
returns {Array}

Example

{{first "['a', 'b', 'c', 'd', 'e']" 2}}
<!-- results in: '["a", "b"]' -->

forEach

Iterates over each item in an array and exposes the current item in the array as context to the inner block. In addition to the current array item, the helper exposes the following variables to the inner block:

index
total
isFirst
isLast Also, @index is exposed as a private variable, and additional private variables may be defined as hash arguments.

Params

array {Array}
returns {String}

Example

<!-- accounts = [
{'name': 'John', 'email': 'john@example.com'},
{'name': 'Malcolm', 'email': 'malcolm@example.com'},
{'name': 'David', 'email': 'david@example.com'}
] -->

{{#forEach accounts}}
  <a href="mailto:{{ email }}" title="Send an email to {{ name }}">
    {{ name }}
  </a>{{#unless isLast}}, {{/unless}}
{{/forEach}}

inArray

Block helper that renders the block if an array has the given value. Optionally specify an inverse block to render when the array does not have the given value.

Params

array {Array}
value {any}
options {Object}
returns {String}

Example

<!-- array: ['a', 'b', 'c'] -->
{{#inArray array "d"}}
  foo
{{else}}
  bar
{{/inArray}}
<!-- results in: 'bar' -->

isArray

Returns true if value is an es5 array.

Params

value {any}: The value to test.
returns {Boolean}

Example

{{isArray "abc"}}
<!-- results in: false -->

<!-- array: [1, 2, 3] -->
{{isArray array}}
<!-- results in: true -->

itemAt

Returns the item from array at index idx.

Params

array {Array}
idx {Number}
returns {any} value

Example

<!-- array: ['a', 'b', 'c'] -->
{{itemAt array 1}}
<!-- results in: 'b' -->

join

Join all elements of array into a string, optionally using a given separator.

Params

array {Array}
separator {String}: The separator to use. Defaults to ,.
returns {String}

Example

<!-- array: ['a', 'b', 'c'] -->
{{join array}}
<!-- results in: 'a, b, c' -->

{{join array '-'}}
<!-- results in: 'a-b-c' -->

hasLength

Returns true if the the length of the given value is equal to the given length. Can be used as a block or inline helper.

Params

value {Array|String}
length {Number}
options {Object}
returns {String}

last

Returns the last item, or last n items of an array or string. Opposite of first.

Params

value {Array|String}: Array or string.
n {Number}: Number of items to return from the end of the array.
returns {Array}

Example

<!-- var value = ['a', 'b', 'c', 'd', 'e'] -->

{{last value}}
<!-- results in: ['e'] -->

{{last value 2}}
<!-- results in: ['d', 'e'] -->

{{last value 3}}
<!-- results in: ['c', 'd', 'e'] -->

length

Returns the length of the given string or array.

Params

value {Array|Object|String}
returns {Number}: The length of the value.

Example

{{length '["a", "b", "c"]'}}
<!-- results in: 3 -->

<!-- results in: myArray = ['a', 'b', 'c', 'd', 'e']; -->
{{length myArray}}
<!-- results in: 5 -->

<!-- results in: myObject = {'a': 'a', 'b': 'b'}; -->
{{length myObject}}
<!-- results in: 2 -->

map

Returns a new array, created by calling function on each element of the given array. For example,

Params

array {Array}
fn {Function}
returns {String}

Example

<!-- array: ['a', 'b', 'c'], and "double" is a
fictitious function that duplicates letters -->
{{map array double}}
<!-- results in: '["aa", "bb", "cc"]' -->

pluck

Map over the given object or array or objects and create an array of values from the given prop. Dot-notation may be used (as a string) to get nested properties.

Params

collection {Array|Object}
prop {Function}
returns {String}

Example

// {{pluck items "data.title"}}
<!-- results in: '["aa", "bb", "cc"]' -->

reverse

Reverse the elements in an array, or the characters in a string.

Params

value {Array|String}
returns {Array|String}: Returns the reversed string or array.

Example

<!-- value: 'abcd' -->
{{reverse value}}
<!-- results in: 'dcba' -->
<!-- value: ['a', 'b', 'c', 'd'] -->
{{reverse value}}
<!-- results in: ['d', 'c', 'b', 'a'] -->

some

Block helper that returns the block if the callback returns true for some value in the given array.

Params

array {Array}
iter {Function}: Iteratee
{Options}: Handlebars provided options object
returns {String}

Example

<!-- array: [1, 'b', 3] -->
{{#some array isString}}
  Render me if the array has a string.
{{else}}
  Render me if it doesn't.
{{/some}}
<!-- results in: 'Render me if the array has a string.' -->

sort

Sort the given array. If an array of objects is passed, you may optionally pass a key to sort on as the second argument. You may alternatively pass a sorting function as the second argument.

Params

array {Array}: the array to sort.
key {String|Function}: The object key to sort by, or sorting function.

Example

<!-- array: ['b', 'a', 'c'] -->
{{sort array}}
<!-- results in: '["a", "b", "c"]' -->

sortBy

Sort an array. If an array of objects is passed, you may optionally pass a key to sort on as the second argument. You may alternatively pass a sorting function as the second argument.

Params

array {Array}: the array to sort.
props {String|Function}: One or more properties to sort by, or sorting functions to use.

Example

<!-- array: [{a: 'zzz'}, {a: 'aaa'}] -->
{{sortBy array "a"}}
<!-- results in: '[{"a":"aaa"}, {"a":"zzz"}]' -->

toArray

Combine the given values into an array.

Params

values {...any}
returns {Array}

Example

{{toArray "foo"}}
<!-- results in: [ "foo" ] -->

{{toArray "foo" "bar"}}
<!-- results in: [ "foo", "bar" ] -->

withAfter

Use the items in the array after the specified index as context inside a block.

Params

array {Array}
idx {Number}
options {Object}
returns {Array}

Example

<!-- array: ['a', 'b', 'c', 'd', 'e'] -->
{{#withAfter array 3}}
  {{this}}
{{/withAfter}}
<!-- results in: "de" -->

withFirst

Use the first item in a collection inside a handlebars block expression. Opposite of withLast.

Params

array {Array}
idx {Number}
options {Object}
returns {String}

Example

<!-- array: ['a', 'b', 'c'] -->
{{#withFirst array}}
  {{this}}
{{/withFirst}}
<!-- results in: 'a' -->

withGroup

Block helper that groups array elements by given group size.

Params

array {Array}: The array to iterate over
size {Number}: The desired length of each array "group"
options {Object}: Handlebars options
returns {String}

Example

<!-- array: ['a','b','c','d','e','f','g','h'] -->
{{#withGroup array 4}}
  {{#each this}}
    {{.}}
  {{each}}
  <br>
{{/withGroup}}
<!-- results in: -->
<!-- 'a','b','c','d'<br> -->
<!-- 'e','f','g','h'<br> -->

withLast

Use the last item or n items in an array as context inside a block. Opposite of withFirst.

Params

array {Array}
idx {Number}: The starting index.
options {Object}
returns {String}

Example

<!-- array: ['a', 'b', 'c'] -->
{{#withLast array}}
  {{this}}
{{/withLast}}
<!-- results in: 'c' -->

withSort

Block helper that sorts a collection and exposes the sorted collection as context inside the block.

Params

array {Array}
prop {String}
options {Object}: Specify reverse="true" to reverse the array.
returns {String}

Example

<!-- array: ['b', 'a', 'c'] -->
{{#withSort array}}{{this}}{{/withSort}}
<!-- results in: 'abc' -->

union

Returns an array of all of the unique values from the two given arrays. Elements are compared using SameValueZero, which is similar to strict equality except that NaN is considered equal to NaN.

Params

array1 {Array}
array2 {Array}
returns {Array}

Example

<!-- array1: ['a', 'a', 'c', 'b'], array2: ['a', 'b', 'e'] -->
{{#each (unique array)}}{{.}}{{/each}}
<!-- results in: 'acbe' -->

unique

Returns an array with all duplicate values removed. Elements are compared using SameValueZero, which is similar to strict equality except that NaN is considered equal to NaN.

Params

array {Array}
options {Object}
returns {Array}

Example

<!-- array: ['a', 'a', 'c', 'b', 'e', 'e'] -->
{{#each (unique array)}}{{.}}{{/each}}
<!-- results in: 'acbe' -->

uniqueBy

Returns an array with all duplicate values removed using the property or comparison function specified.

Params

array {Array}
prop {String|Function}: The property or comparison function by which to determine uniqueness.
returns {Array}

Example

<!-- array: [{a: 'zz', id: 1}, {a: 'aa', id: 2}, {a: 'zz', id: 3}] -->
{{uniqueBy array "a"}}
<!-- results in: [{ a: "zz", id: 1}, { a: "aa", id: 2 }] -->

code

gist

Embed a GitHub Gist using only the id of the Gist

Params

id {String}
returns {String}

Example

{{gist "12345"}}

jsfiddle

Generate the HTML for a jsFiddle link with the given params

Params

params {Object}
returns {String}

Example

{{jsfiddle id="0dfk10ks" tabs="true"}}

collection

isEmpty

Inline, subexpression, or block helper that returns true (or the block) if the given collection is empty, or false (or the inverse block, if supplied) if the colleciton is not empty.

Params

collection {Object}
options {Object}
returns {String}

Example

<!-- array: [] -->
{{#isEmpty array}}AAA{{else}}BBB{{/isEmpty}}
<!-- results in: 'AAA' -->

<!-- array: [] -->
{{isEmpty array}}
<!-- results in: true -->

iterate

Block helper that iterates over an array or object. If an array is given, .forEach is called, or if an object is given, .forOwn is called, otherwise the inverse block is returned.

Params

collection {Object|Array}: The collection to iterate over
options {Object}
returns {String}

comparison

and

Helper that renders the block if both of the given values are truthy. If an inverse block is specified it will be rendered when falsy. Works as a block helper, inline helper or subexpression.

Params

a {any}
b {any}
options {Object}: Handlebars provided options object
returns {String}

Example

<!-- {great: true, magnificent: true} -->
{{#and great magnificent}}A{{else}}B{{/and}}
<!-- results in: 'A' -->

compare

Render a block when a comparison of the first and third arguments returns true. The second argument is the arithmetic operator to use. You may also optionally specify an inverse block to render when falsy.

Params

a {}
operator {}: The operator to use. Operators must be enclosed in quotes: ">", "=", "<=", and so on.
b {}
options {Object}: Handlebars provided options object
returns {String}: Block, or if specified the inverse block is rendered if falsey.

contains

Block helper that renders the block if collection has the given value, using strict equality (===) for comparison, otherwise the inverse block is rendered (if specified). If a startIndex is specified and is negative, it is used as the offset from the end of the collection.

Params

collection {Array|Object|String}: The collection to iterate over.
value {any}: The value to check for.
[startIndex=0] {Number}: Optionally define the starting index.
options {Object}: Handlebars provided options object.

Example

<!-- array = ['a', 'b', 'c'] -->
{{#contains array "d"}}
  This will not be rendered.
{{else}}
  This will be rendered.
{{/contains}}

default

Returns the first value that is not undefined, otherwise the "default" value is returned.

Params

value {any}
defaultValue {any}
returns {String}

eq

Block helper that renders a block if a is equal to b. If an inverse block is specified it will be rendered when falsy. You may optionally use the compare="" hash argument for the second value.

Params

a {String}
b {String}
options {Object}: Handlebars provided options object
returns {String}: Block, or inverse block if specified and falsey.

gt

Block helper that renders a block if a is greater than b.

If an inverse block is specified it will be rendered when falsy. You may optionally use the compare="" hash argument for the second value.

Params

a {String}
b {String}
options {Object}: Handlebars provided options object
returns {String}: Block, or inverse block if specified and falsey.

gte

Block helper that renders a block if a is greater than or equal to b.

If an inverse block is specified it will be rendered when falsy. You may optionally use the compare="" hash argument for the second value.

Params

a {String}
b {String}
options {Object}: Handlebars provided options object
returns {String}: Block, or inverse block if specified and falsey.

has

Block helper that renders a block if value has pattern. If an inverse block is specified it will be rendered when falsy.

Params

val {any}: The value to check.
pattern {any}: The pattern to check for.
options {Object}: Handlebars provided options object
returns {String}

isTruthy

Returns true if the given value is truthy.

Params

val {any}
options {Options}
returns {Boolean}

ifEven

Return true if the given value is an even number.

Params

number {Number}
options {Object}: Handlebars provided options object
returns {String}: Block, or inverse block if specified and falsey.

Example

{{#ifEven value}}
  render A
{{else}}
  render B
{{/ifEven}}

ifNth

Conditionally renders a block if the remainder is zero when a operand is divided by b. If an inverse block is specified it will be rendered when the remainder is not zero.

Params

{}: {Number}
{}: {Number}
options {Object}: Handlebars provided options object
returns {String}: Block, or inverse block if specified and falsey.

ifOdd

Block helper that renders a block if value is an odd number. If an inverse block is specified it will be rendered when falsy.

Params

value {Object}
options {Object}: Handlebars provided options object
returns {String}: Block, or inverse block if specified and falsey.

Example

{{#ifOdd value}}
  render A
{{else}}
  render B
{{/ifOdd}}

is

Block helper that renders a block if a is equal to b. If an inverse block is specified it will be rendered when falsy. Similar to eq but does not do strict equality.

Params

a {any}
b {any}
options {Object}: Handlebars provided options object
returns {String}

isnt

Block helper that renders a block if a is not equal to b. If an inverse block is specified it will be rendered when falsy. Similar to unlessEq but does not use strict equality for comparisons.

Params

a {String}
b {String}
options {Object}: Handlebars provided options object
returns {String}

lt

Block helper that renders a block if a is less than b.

If an inverse block is specified it will be rendered when falsy. You may optionally use the compare="" hash argument for the second value.

Params

context {Object}
options {Object}: Handlebars provided options object
returns {String}: Block, or inverse block if specified and falsey.

lte

Block helper that renders a block if a is less than or equal to b.

If an inverse block is specified it will be rendered when falsy. You may optionally use the compare="" hash argument for the second value.

Params

a {Sring}
b {Sring}
options {Object}: Handlebars provided options object
returns {String}: Block, or inverse block if specified and falsey.

neither

Block helper that renders a block if neither of the given values are truthy. If an inverse block is specified it will be rendered when falsy.

Params

a {any}
b {any}
options {}: Handlebars options object
returns {String}: Block, or inverse block if specified and falsey.

not

Returns true if val is falsey. Works as a block or inline helper.

Params

val {String}
options {Object}: Handlebars provided options object
returns {String}

or

Block helper that renders a block if any of the given values is truthy. If an inverse block is specified it will be rendered when falsy.

Params

arguments {...any}: Variable number of arguments
options {Object}: Handlebars options object
returns {String}: Block, or inverse block if specified and falsey.

Example

{{#or a b c}}
  If any value is true this will be rendered.
{{/or}}

unlessEq

Block helper that always renders the inverse block unless a is is equal to b.

Params

a {String}
b {String}
options {Object}: Handlebars provided options object
returns {String}: Inverse block by default, or block if falsey.

unlessGt

Block helper that always renders the inverse block unless a is is greater than b.

Params

a {Object}: The default value
b {Object}: The value to compare
options {Object}: Handlebars provided options object
returns {String}: Inverse block by default, or block if falsey.

unlessLt

Block helper that always renders the inverse block unless a is is less than b.

Params

a {Object}: The default value
b {Object}: The value to compare
options {Object}: Handlebars provided options object
returns {String}: Block, or inverse block if specified and falsey.

unlessGteq

Block helper that always renders the inverse block unless a is is greater than or equal to b.

Params

a {any}
b {any}
options {Object}: Handlebars provided options object
returns {String}: Block, or inverse block if specified and falsey.

unlessLteq

Block helper that always renders the inverse block unless a is is less than or equal to b.

Params

a {any}
b {any}
options {Object}: Handlebars provided options object
returns {String}: Block, or inverse block if specified and falsey.

date

year

Get the current year.

Example

{{year}}
<!-- 2017 -->

html

attr

Stringify attributes on the options hash.

Params

options {Object}
returns {String}

Example

<!-- value = 'bar' -->
<div{{attr foo=value}}></div>
<!-- results in: <div foo="bar"></div>

css

Add an array of <link> tags. Automatically resolves relative paths to options.assets if passed on the context.

Params

list {String|Array}: One or more stylesheet urls.
returns {String}

Example

<!-- {stylesheets: ['foo.css', 'bar.css']} -->
{{css stylesheets}}

<!-- results in: -->
<!-- <link type="text/css" rel="stylesheet" href="foo.css"> -->
<!-- <link type="text/css" rel="stylesheet" href="bar.css"> -->

js

Generate one or more <script></script> tags with paths/urls to javascript or coffeescript files.

Params

context {Object}
returns {String}

Example

{{js scripts}}

sanitize

Strip HTML tags from a string, so that only the text nodes are preserved.

Params

str {String}: The string of HTML to sanitize.
returns {String}

Example

{{sanitize "<span>foo</span>"}}
<!-- results in: 'foo' -->

ul

Block helper for creating unordered lists (<ul></ul>)

Params

context {Object}
options {Object}
returns {String}

ol

Block helper for creating ordered lists (<ol></ol>)

Params

context {Object}
options {Object}
returns {String}

thumbnailImage

Returns a <figure> with a thumbnail linked to a full picture

Params

context {Object}: Object with values/attributes to add to the generated elements:
context.alt {String}
context.src {String}
context.width {Number}
context.height {Number}
returns {String}: HTML <figure> element with image and optional caption/link.

internationalization

i18n

i18n helper. See button-i18n for a working example.

Params

key {String}
options {Object}
returns {String}

inflection

inflect

Returns either the singular or plural inflection of a word based on the given count.

Params

count {Number}
singular {String}: The singular form
plural {String}: The plural form
includeCount {String}
returns {String}

Example

{{inflect 0 "string" "strings"}}
<!-- "strings" -->
{{inflect 1 "string" "strings"}}
<!-- "string" -->
{{inflect 1 "string" "strings" true}}
<!-- "1 string" -->
{{inflect 2 "string" "strings"}}
<!-- "strings" -->
{{inflect 2 "string" "strings" true}}
<!-- "2 strings" -->

ordinalize

Returns an ordinalized number as a string.

Params

val {String}: The value to ordinalize.
returns {String}: The ordinalized number

Example

{{ordinalize 1}}
<!-- '1st' -->
{{ordinalize 21}}
<!-- '21st' -->
{{ordinalize 29}}
<!-- '29th' -->
{{ordinalize 22}}
<!-- '22nd' -->

markdown

markdownToHTML

Block helper that converts a string of inline markdown to HTML.

Params

context {Object}
options {Object}
returns {String}

Example

{{#markdownToHTML}}
# Foo

> some quote
{{/markdownToHTML}}
<!-- results in:
<h1>Foo</h1>
<blockquote>
<p>some quote</p>
</blockquote>
-->

math

abs

Return the magnitude of a.

Params

a {Number}
returns {Number}

add

Return the sum of a plus b.

Params

a {Number}
b {Number}
returns {Number}

avg

Returns the average of all numbers in the given array.

Params

array {Array}: Array of numbers to add up.
returns {Number}

Example

{{avg "[1, 2, 3, 4, 5]"}}
<!-- results in: '3' -->

ceil

Get the Math.ceil() of the given value.

Params

value {Number}
returns {Number}

divide

Divide a by b

Params

a {Number}: numerator
b {Number}: denominator

floor

Get the Math.floor() of the given value.

Params

value {Number}
returns {Number}

multiply

Return the product of a times b.

Params

a {Number}: factor
b {Number}: multiplier
returns {Number}

random

Generate a random number between two values

Params

min {Number}
max {Number}
returns {Number}

remainder

Get the remainder of dividing a by b.

Params

a {Number}
b {Number}
returns {Number}

Example

{{remainder 7 5}}
<!-- results in: 2 -->

round

Round the given number.

Params

number {Number}
returns {Number}

subtract

Return the product of a minus b.

Params

a {Number}
b {Number}
returns {Number}

sum

Returns the sum of all numbers in the given array.

Params

array {Array}: Array of numbers to add up.
returns {Number}

Example

{{sum "[1, 2, 3, 4, 5]"}}
<!-- results in: '15' -->

misc

option

Return the given value of prop from this.options.

Params

prop {String}
returns {any}

Example

<!-- context = {options: {a: {b: {c: 'ddd'}}}} -->
{{option "a.b.c"}}
<!-- results => `ddd` -->

noop

Block helper that renders the block without taking any arguments.

Params

options {Object}
returns {String}

typeOf

Get the native type of the given value

Params

value {any}
returns {String}: Returns the type of value.

Example

{{typeOf 1}}
//=> 'number'
{{typeOf "1"}}
//=> 'string'
{{typeOf "foo"}}
//=> 'string'

withHash

Block helper that builds the context for the block from the options hash.

Params

options {Object}: Handlebars provided options object.

number

bytes

Format a number to it's equivalent in bytes. If a string is passed, it's length will be formatted and returned.

Examples:

'foo' => 3 B
13661855 => 13.66 MB
825399 => 825.39 kB
1396 => 1.4 kB

Params

number {Number|String}
returns {String}

addCommas

Add commas to numbers

Params

num {Number}
returns {Number}

phoneNumber

Convert a string or number to a formatted phone number.

Params

num {Number|String}: The phone number to format, e.g. 8005551212
returns {Number}: Formatted phone number: (800) 555-1212

toAbbr

Abbreviate numbers to the given number of precision. This is for general numbers, not size in bytes.

Params

number {Number}
precision {Number}
returns {String}

toExponential

Returns a string representing the given number in exponential notation.

Params

number {Number}
fractionDigits {Number}: Optional. An integer specifying the number of digits to use after the decimal point. Defaults to as many digits as necessary to specify the number.
returns {Number}

Example

{{toExponential number digits}};

toFixed

Formats the given number using fixed-point notation.

Params

number {Number}
digits {Number}: (Optional) The number of digits to appear after the decimal point; this may be a value between 0 and 20. If this argument is omitted, it is treated as 0.
returns {String}: A string representing the given number using fixed-point notation.

Example

{{toFixed "1.1234" 2}}
//=> '1.12'

toFloat

Params

number {Number}
returns {Number}

toInt

Params

number {Number}
returns {Number}

toPrecision

Returns a string representing the Number object to the specified precision.

Params

number {Number}
precision {Number}: (Optional) An integer specifying the number of significant digits. If precison is not between 1 and 100 (inclusive), it will be coerced to 0.
returns {String}: A string representing a Number object in fixed-point or exponential notation rounded to precision significant digits.

Example

{{toPrecision "1.1234" 2}}
//=> '1.1'

object

extend

Extend the context with the properties of other objects. A shallow merge is performed to avoid mutating the context.

Params

objects {Object}: One or more objects to extend.
returns {Object}

forIn

Block helper that iterates over the properties of an object, exposing each key and value on the context.

Params

context {Object}
options {Object}
returns {String}

forOwn

Block helper that iterates over the own properties of an object, exposing each key and value on the context.

Params

obj {Object}: The object to iterate over.
options {Object}
returns {String}

toPath

Take arguments and, if they are string or number, convert them to a dot-delineated object property path.

Params

prop {String|Number}: The property segments to assemble (can be multiple).
returns {String}

get

Use property paths (a.b.c) to get a value or nested value from the context. Works as a regular helper or block helper.

Params

prop {String}: The property to get, optionally using dot notation for nested properties.
context {Object}: The context object
options {Object}: The handlebars options object, if used as a block helper.
returns {String}

getObject

Use property paths (a.b.c) to get an object from the context. Differs from the get helper in that this helper will return the actual object, including the given property key. Also, this helper does not work as a block helper.

Params

prop {String}: The property to get, optionally using dot notation for nested properties.
context {Object}: The context object
returns {String}

hasOwn

Return true if key is an own, enumerable property of the given context object.

Params

key {String}
context {Object}: The context object.
returns {Boolean}

Example

{{hasOwn context key}}

isObject

Return true if value is an object.

Params

value {String}
returns {Boolean}

Example

{{isObject "foo"}}
//=> false

JSONparse

Parses the given string using JSON.parse.

Params

string {String}: The string to parse

Example

<!-- string: '{"foo": "bar"}' -->
{{JSONparse string}}
<!-- results in: { foo: 'bar' } -->

JSONstringify

Stringify an object using JSON.stringify.

Params

obj {Object}: Object to stringify
returns {String}

Example

<!-- object: { foo: 'bar' } -->
{{JSONstringify object}}
<!-- results in: '{"foo": "bar"}' -->

merge

Deeply merge the properties of the given objects with the context object.

Params

object {Object}: The target object. Pass an empty object to shallow clone.
objects {Object}
returns {Object}

pick

Pick properties from the context object.

Params

properties {Array|String}: One or more properties to pick.
context {Object}
options {Object}: Handlebars options object.
returns {Object}: Returns an object with the picked values. If used as a block helper, the values are passed as context to the inner block. If no values are found, the context is passed to the inverse block.

path

dirname

Get the directory path segment from the given filepath.

Params

ext {String}
returns {String}

Example

{{dirname "docs/toc.md"}}
<!-- results in: 'docs' -->

relative

Get the relative filepath from a to b.

Params

a {String}
b {String}
returns {String}

Example

{{relative a b}}

basename

Get the file extension from the given filepath.

Params

ext {String}
returns {String}

Example

{{basename "docs/toc.md"}}
<!-- results in: 'toc.md' -->

stem

Get the "stem" from the given filepath.

Params

filepath {String}
returns {String}

Example

{{stem "docs/toc.md"}}
<!-- results in: 'toc' -->

extname

Get the file extension from the given filepath.

Params

filepath {String}
returns {String}

Example

{{extname "docs/toc.md"}}
<!-- results in: '.md' -->

segments

Get specific (joined) segments of a file path by passing a range of array indices.

Params

filepath {String}: The file path to split into segments.
returns {String}: Returns a single, joined file path.

Example

{{segments "a/b/c/d" "2" "3"}}
<!-- results in: 'c/d' -->

{{segments "a/b/c/d" "1" "3"}}
<!-- results in: 'b/c/d' -->

{{segments "a/b/c/d" "1" "2"}}
<!-- results in: 'b/c' -->

regex

toRegex

Convert the given string to a regular expression.

Params

str {String}
returns {RegExp}

Example

{{toRegex "foo"}}
<!-- results in: /foo/ -->

test

Returns true if the given str matches the given regex. A regex can be passed on the context, or using the toRegex helper as a subexpression.

Params

str {String}
returns {RegExp}

Example

{{test "bar" (toRegex "foo")}}
<!-- results in: false -->
{{test "foobar" (toRegex "foo")}}
<!-- results in: true -->
{{test "foobar" (toRegex "^foo$")}}
<!-- results in: false -->

string

append

Append the specified suffix to the given string.

Params

str {String}
suffix {String}
returns {String}

Example

<!-- given that "item.stem" is "foo" -->
{{append item.stem ".html"}}
<!-- results in:  'foo.html' -->

camelcase

camelCase the characters in the given string.

Params

string {String}: The string to camelcase.
returns {String}

Example

{{camelcase "foo bar baz"}};
<!-- results in:  'fooBarBaz' -->

capitalize

Capitalize the first word in a sentence.

Params

str {String}
returns {String}

Example

{{capitalize "foo bar baz"}}
<!-- results in:  "Foo bar baz" -->

capitalizeAll

Capitalize all words in a string.

Params

str {String}
returns {String}

Example

{{capitalizeAll "foo bar baz"}}
<!-- results in:  "Foo Bar Baz" -->

center

Center a string using non-breaking spaces

Params

str {String}
spaces {String}
returns {String}

chop

Like trim, but removes both extraneous whitespace and non-word characters from the beginning and end of a string.

Params

string {String}: The string to chop.
returns {String}

Example

{{chop "_ABC_"}}
<!-- results in:  'ABC' -->

{{chop "-ABC-"}}
<!-- results in:  'ABC' -->

{{chop " ABC "}}
<!-- results in:  'ABC' -->

dashcase

dash-case the characters in string. Replaces non-word characters and periods with hyphens.

Params

string {String}
returns {String}

Example

{{dashcase "a-b-c d_e"}}
<!-- results in:  'a-b-c-d-e' -->

dotcase

dot.case the characters in string.

Params

string {String}
returns {String}

Example

{{dotcase "a-b-c d_e"}}
<!-- results in:  'a.b.c.d.e' -->

ellipsis

Truncates a string to the specified length, and appends it with an elipsis, ….

Params

str {String}
length {Number}: The desired length of the returned string.
returns {String}: The truncated string.

Example

{{ellipsis (sanitize "<span>foo bar baz</span>"), 7}}
<!-- results in:  'foo bar…' -->
{{ellipsis "foo bar baz", 7}}
<!-- results in:  'foo bar…' -->

hyphenate

Replace spaces in a string with hyphens.

Params

str {String}
returns {String}

Example

{{hyphenate "foo bar baz qux"}}
<!-- results in:  "foo-bar-baz-qux" -->

isString

Return true if value is a string.

Params

value {String}
returns {Boolean}

Example

{{isString "foo"}}
<!-- results in:  'true' -->

lowercase

Lowercase all characters in the given string.

Params

str {String}
returns {String}

Example

{{lowercase "Foo BAR baZ"}}
<!-- results in:  'foo bar baz' -->

occurrences

Return the number of occurrences of substring within the given string.

Params

str {String}
substring {String}
returns {Number}: Number of occurrences

Example

{{occurrences "foo bar foo bar baz" "foo"}}
<!-- results in:  2 -->

pascalcase

PascalCase the characters in string.

Params

string {String}
returns {String}

Example

{{pascalcase "foo bar baz"}}
<!-- results in:  'FooBarBaz' -->

pathcase

path/case the characters in string.

Params

string {String}
returns {String}

Example

{{pathcase "a-b-c d_e"}}
<!-- results in:  'a/b/c/d/e' -->

plusify

Replace spaces in the given string with pluses.

Params

str {String}: The input string
returns {String}: Input string with spaces replaced by plus signs

Example

{{plusify "foo bar baz"}}
<!-- results in:  'foo+bar+baz' -->

prepend

Prepends the given string with the specified prefix.

Params

str {String}
prefix {String}
returns {String}

Example

<!-- given that "val" is "bar" -->
{{prepend val "foo-"}}
<!-- results in:  'foo-bar' -->

raw

Render a block without processing mustache templates inside the block.

Params

options {Object}
returns {String}

Example

{{{{#raw}}}}
{{foo}}
{{{{/raw}}}}
<!-- results in:  '{{foo}}' -->

remove

Remove all occurrences of substring from the given str.

Params

str {String}
substring {String}
returns {String}

Example

{{remove "a b a b a b" "a "}}
<!-- results in:  'b b b' -->

removeFirst

Remove the first occurrence of substring from the given str.

Params

str {String}
substring {String}
returns {String}

Example

{{remove "a b a b a b" "a"}}
<!-- results in:  ' b a b a b' -->

replace

Replace all occurrences of substring a with substring b.

Params

str {String}
a {String}
b {String}
returns {String}

Example

{{replace "a b a b a b" "a" "z"}}
<!-- results in:  'z b z b z b' -->

replaceFirst

Replace the first occurrence of substring a with substring b.

Params

str {String}
a {String}
b {String}
returns {String}

Example

{{replace "a b a b a b" "a" "z"}}
<!-- results in:  'z b a b a b' -->

sentence

Sentence case the given string

Params

str {String}
returns {String}

Example

{{sentence "hello world. goodbye world."}}
<!-- results in:  'Hello world. Goodbye world.' -->

snakecase

snake_case the characters in the given string.

Params

string {String}
returns {String}

Example

{{snakecase "a-b-c d_e"}}
<!-- results in:  'a_b_c_d_e' -->

split

Split string by the given separator, which can be a string or a regular expression.

Params

string {String}: The string to split.
returns {String|RegExp} separator: Default is an empty string.

Example

{{split "a,b,c" ","}}
<!-- results in:  ['a', 'b', 'c'] -->

startsWith

Tests whether a string begins with the given prefix.

Params

prefix {String}
testString {String}
options {String}
returns {String}

Example

{{#startsWith "Goodbye" "Hello, world!"}}
  Whoops
{{else}}
  Bro, do you even hello world?
{{/startsWith}}

titleize

Title case the given string.

Params

str {String}
returns {String}

Example

{{titleize "this is title case"}}
<!-- results in:  'This Is Title Case' -->

trim

Removes extraneous whitespace from the beginning and end of a string.

Params

string {String}: The string to trim.
returns {String}

Example

{{trim " ABC "}}
<!-- results in:  'ABC' -->

trimLeft

Removes extraneous whitespace from the beginning of a string.

Params

string {String}: The string to trim.
returns {String}

Example

{{trim " ABC "}}
<!-- results in:  'ABC ' -->

trimRight

Removes extraneous whitespace from the end of a string.

Params

string {String}: The string to trim.
returns {String}

Example

{{trimRight " ABC "}}
<!-- results in:  ' ABC' -->

truncate

Truncate a string to the specified length. Also see ellipsis.

Params

str {String}
limit {Number}: The desired length of the returned string.
suffix {String}: Optionally supply a string to use as a suffix to denote when the string has been truncated. Otherwise an ellipsis (…) will be used.
returns {String}: The truncated string.

Example

truncate("foo bar baz", 7);
<!-- results in:  'foo bar' -->
truncate(sanitize("<span>foo bar baz</span>", 7));
<!-- results in:  'foo bar' -->

truncateWords

Truncate a string to have the specified number of words. Also see truncate.

Params

str {String}
limit {Number}: The desired length of the returned string.
suffix {String}: Optionally supply a string to use as a suffix to denote when the string has been truncated.
returns {String}: The truncated string.

Example

truncateWords("foo bar baz", 1);
<!-- results in:  'foo…' -->
truncateWords("foo bar baz", 2);
<!-- results in:  'foo bar…' -->
truncateWords("foo bar baz", 3);
<!-- results in:  'foo bar baz' -->

uppercase

Uppercase all of the characters in the given string. If used as a block helper it will uppercase the entire block. This helper does not support inverse blocks.

Params

str {String}: The string to uppercase
options {Object}: Handlebars options object
returns {String}

Example

{{uppercase "aBcDeF"}}
<!-- results in:  'ABCDEF' -->

url

decodeURIComponent

Decode a Uniform Resource Identifier (URI) component.

Params

str {String}
returns {String}

encodeURIComponent

Encodes a Uniform Resource Identifier (URI) component by replacing each instance of certain characters by one, two, three, or four escape sequences representing the UTF-8 encoding of the character.

Params

str {String}: The un-encoded string
returns {String}: The encoded string

urlResolve

Take a base URL and a href URL and resolve them as a browser would for an anchor tag.

Params

base {String}
href {String}
returns {String}

Example

{{urlResolve "http://example.com" "one"}}
<!-- results in: 'http://example.com/one' -->

{{urlResolve "http://example.com/" "/one"}}
<!-- results in: 'http://example.com/one' -->

{{urlResolve "http://example.com/one" "/two"}}
<!-- results in: 'http://example.com/two' -->

{{urlResolve "http://example.com/one/" "two"}}
<!-- results in: 'http://example.com/one/two' -->

{{urlResolve "http://example.com/one/" "./two"}}
<!-- results in: 'http://example.com/one/two' -->

{{urlResolve "http://example.com/one" "./two"}}
<!-- results in: 'http://example.com/two' -->

urlParse

Parses a url string into an object.

Params

str {String}: URL string
returns {String}: Returns stringified JSON

stripQuerystring

Strip the query string from the given url.

Params

url {String}
returns {String}: the url without the queryString

About

Related projects

template-helpers: Generic JavaScript helpers that can be used with any template engine. Handlebars, Lo-Dash, Underscore, or… more | homepage

Contributing

Pull requests and stars are always welcome. For bugs and feature requests, please create an issue.

Running tests

Running and reviewing unit tests is a great way to get familiarized with a library and its API. You can install this project's dependencies and run tests with the following command:

npm install && npm test

Author

Brian Woodward

Dmitriy Cherchenko

Jon Schlinkert

useful-handlebars-helpers

handlebars-helpers

Browsers are supported

Usage

Helper categories

All helpers

Array helpers

Code helpers

Collection helpers

Comparison helpers

Date helpers

HTML helpers

Internationalization helpers

Inflection helpers

Markdown helpers

Math helpers

Misc helpers

Number helpers

Object helpers

Path helpers

Regex helpers

String helpers

URL helpers

array

after

eachIndex

filter

first

forEach

inArray

isArray

itemAt

join

hasLength

last

length

map

pluck

reverse

some

sort

sortBy

toArray

withAfter

withFirst

withGroup

withLast

withSort

union

unique

uniqueBy

code

gist

jsfiddle

collection

isEmpty

iterate

comparison

and

compare

contains

default

eq

gt

gte

has

isTruthy

ifEven

ifNth

ifOdd

is

isnt

lt

lte

neither

not

or

unlessEq

unlessGt

unlessLt