Module ActionView::Helpers::NumberHelper
In: lib/action_view/helpers/number_helper.rb

Provides methods for converting a numbers into formatted strings. Methods are provided for phone numbers, currency, percentage, precision, positional notation, and file size.

Methods

Public Instance methods

human_size(size, precision=1)

Formats a number into a currency string. You can customize the format in the options hash.

  • :precision - Sets the level of precision, defaults to 2
  • :unit - Sets the denomination of the currency, defaults to "$"
  • :separator - Sets the separator between the units, defaults to "."
  • :delimiter - Sets the thousands delimiter, defaults to ","
 number_to_currency(1234567890.50)     => $1,234,567,890.50
 number_to_currency(1234567890.506)    => $1,234,567,890.51
 number_to_currency(1234567890.506, :precision => 3)    => $1,234,567,890.506
 number_to_currency(1234567890.50, :unit => "£", :separator => ",", :delimiter => "")
    => £1234567890,50

Formats the bytes in size into a more understandable representation. Useful for reporting file sizes to users. This method returns nil if size cannot be converted into a number. You can change the default precision of 1 in precision.

 number_to_human_size(123)           => 123 Bytes
 number_to_human_size(1234)          => 1.2 KB
 number_to_human_size(12345)         => 12.1 KB
 number_to_human_size(1234567)       => 1.2 MB
 number_to_human_size(1234567890)    => 1.1 GB
 number_to_human_size(1234567890123) => 1.1 TB
 number_to_human_size(1234567, 2)    => 1.18 MB

Formats a number as a percentage string. You can customize the format in the options hash.

  • :precision - Sets the level of precision, defaults to 3
  • :separator - Sets the separator between the units, defaults to "."
 number_to_percentage(100)    => 100.000%
 number_to_percentage(100, {:precision => 0})   => 100%
 number_to_percentage(302.0574, {:precision => 2})   => 302.06%

Formats a number into a US phone number. You can customize the format in the options hash.

  • :area_code - Adds parentheses around the area code.
  • :delimiter - Specifies the delimiter to use, defaults to "-".
  • :extension - Specifies an extension to add to the end of the generated number
  • :country_code - Sets the country code for the phone number.
 number_to_phone(1235551234)   => 123-555-1234
 number_to_phone(1235551234, :area_code => true)   => (123) 555-1234
 number_to_phone(1235551234, :delimiter => " ")    => 123 555 1234
 number_to_phone(1235551234, :area_code => true, :extension => 555)  => (123) 555-1234 x 555
 number_to_phone(1235551234, :country_code => 1)

Formats a number with grouped thousands using delimiter. You can customize the format using optional delimiter and separator parameters.

  • delimiter - Sets the thousands delimiter, defaults to ","
  • separator - Sets the separator between the units, defaults to "."
 number_with_delimiter(12345678)      => 12,345,678
 number_with_delimiter(12345678.05)   => 12,345,678.05
 number_with_delimiter(12345678, ".")   => 12.345.678

Formats a number with the specified level of precision. The default level of precision is 3.

 number_with_precision(111.2345)    => 111.235
 number_with_precision(111.2345, 2) => 111.24

[Validate]