232 lines
12 KiB
Ruby
Executable File
232 lines
12 KiB
Ruby
Executable File
require "date"
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module ActionView
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module Helpers
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# The Date Helper primarily creates select/option tags for different kinds of dates and date elements. All of the select-type methods
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# share a number of common options that are as follows:
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#
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# * <tt>:prefix</tt> - overwrites the default prefix of "date" used for the select names. So specifying "birthday" would give
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# birthday[month] instead of date[month] if passed to the select_month method.
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# * <tt>:include_blank</tt> - set to true if it should be possible to set an empty date.
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# * <tt>:discard_type</tt> - set to true if you want to discard the type part of the select name. If set to true, the select_month
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# method would use simply "date" (which can be overwritten using <tt>:prefix</tt>) instead of "date[month]".
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module DateHelper
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DEFAULT_PREFIX = "date" unless const_defined?("DEFAULT_PREFIX")
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# Reports the approximate distance in time between to Time objects. For example, if the distance is 47 minutes, it'll return
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# "about 1 hour". See the source for the complete wording list.
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def distance_of_time_in_words(from_time, to_time)
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distance_in_minutes = ((to_time - from_time) / 60).round
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case distance_in_minutes
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when 0 then "less than a minute"
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when 1 then "1 minute"
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when 2..45 then "#{distance_in_minutes} minutes"
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when 46..90 then "about 1 hour"
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when 90..1440 then "about #{(distance_in_minutes.to_f / 60.0).round} hours"
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when 1441..2880 then "1 day"
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else "#{(distance_in_minutes / 1440).round} days"
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end
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end
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# Like distance_of_time_in_words, but where <tt>to_time</tt> is fixed to <tt>Time.now</tt>.
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def distance_of_time_in_words_to_now(from_time)
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distance_of_time_in_words(from_time, Time.now)
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end
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# Returns a set of select tags (one for year, month, and day) pre-selected for accessing a specified date-based attribute (identified by
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# +method+) on an object assigned to the template (identified by +object+). It's possible to tailor the selects through the +options+ hash,
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# which both accepts all the keys that each of the individual select builders does (like :use_month_numbers for select_month) and a range
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# of discard options. The discard options are <tt>:discard_month</tt> and <tt>:discard_day</tt>. Set to true, they'll drop the respective
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# select. Discarding the month select will also automatically discard the day select.
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#
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# NOTE: Discarded selects will default to 1. So if no month select is available, January will be assumed. Additionally, you can get the
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# month select before the year by setting :month_before_year to true in the options. This is especially useful for credit card forms.
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# Examples:
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#
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# date_select("post", "written_on")
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# date_select("post", "written_on", :start_year => 1995)
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# date_select("post", "written_on", :start_year => 1995, :use_month_numbers => true,
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# :discard_day => true, :include_blank => true)
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#
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# The selects are prepared for multi-parameter assignment to an Active Record object.
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def date_select(object, method, options = {})
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InstanceTag.new(object, method, self).to_date_select_tag(options)
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end
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# Returns a set of select tags (one for year, month, day, hour, and minute) pre-selected for accessing a specified datetime-based
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# attribute (identified by +method+) on an object assigned to the template (identified by +object+). Examples:
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#
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# datetime_select("post", "written_on")
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# datetime_select("post", "written_on", :start_year => 1995)
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#
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# The selects are prepared for multi-parameter assignment to an Active Record object.
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def datetime_select(object, method, options = {})
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InstanceTag.new(object, method, self).to_datetime_select_tag(options)
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end
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# Returns a set of html select-tags (one for year, month, and day) pre-selected with the +date+.
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def select_date(date = Date.today, options = {})
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select_year(date, options) + select_month(date, options) + select_day(date, options)
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end
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# Returns a set of html select-tags (one for year, month, day, hour, and minute) preselected the +datetime+.
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def select_datetime(datetime = Time.now, options = {})
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select_year(datetime, options) + select_month(datetime, options) + select_day(datetime, options) +
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select_hour(datetime, options) + select_minute(datetime, options)
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end
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# Returns a select tag with options for each of the minutes 0 through 59 with the current minute selected.
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# The <tt>minute</tt> can also be substituted for a minute number.
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def select_minute(datetime, options = {})
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minute_options = []
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0.upto(59) do |minute|
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minute_options << ((datetime.kind_of?(Fixnum) ? datetime : datetime.min) == minute ?
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"<option selected=\"selected\">#{leading_zero_on_single_digits(minute)}</option>\n" :
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"<option>#{leading_zero_on_single_digits(minute)}</option>\n"
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)
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end
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select_html("minute", minute_options, options[:prefix], options[:include_blank], options[:discard_type])
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end
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# Returns a select tag with options for each of the hours 0 through 23 with the current hour selected.
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# The <tt>hour</tt> can also be substituted for a hour number.
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def select_hour(datetime, options = {})
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hour_options = []
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0.upto(23) do |hour|
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hour_options << ((datetime.kind_of?(Fixnum) ? datetime : datetime.hour) == hour ?
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"<option selected=\"selected\">#{leading_zero_on_single_digits(hour)}</option>\n" :
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"<option>#{leading_zero_on_single_digits(hour)}</option>\n"
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)
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end
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select_html("hour", hour_options, options[:prefix], options[:include_blank], options[:discard_type])
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end
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# Returns a select tag with options for each of the days 1 through 31 with the current day selected.
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# The <tt>date</tt> can also be substituted for a hour number.
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def select_day(date, options = {})
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day_options = []
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1.upto(31) do |day|
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day_options << ((date.kind_of?(Fixnum) ? date : date.day) == day ?
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"<option selected=\"selected\">#{day}</option>\n" :
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"<option>#{day}</option>\n"
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)
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end
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select_html("day", day_options, options[:prefix], options[:include_blank], options[:discard_type])
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end
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# Returns a select tag with options for each of the months January through December with the current month selected.
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# The month names are presented as keys (what's shown to the user) and the month numbers (1-12) are used as values
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# (what's submitted to the server). It's also possible to use month numbers for the presentation instead of names --
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# set the <tt>:use_month_numbers</tt> key in +options+ to true for this to happen. If you want both numbers and names,
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# set the <tt>:add_month_numbers</tt> key in +options+ to true. Examples:
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#
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# select_month(Date.today) # Will use keys like "January", "March"
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# select_month(Date.today, :use_month_numbers => true) # Will use keys like "1", "3"
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# select_month(Date.today, :add_month_numbers => true) # Will use keys like "1 - January", "3 - March"
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def select_month(date, options = {})
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month_options = []
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1.upto(12) do |month_number|
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month_name = if options[:use_month_numbers]
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month_number
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elsif options[:add_month_numbers]
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month_number.to_s + " - " + Date::MONTHNAMES[month_number]
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else
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Date::MONTHNAMES[month_number]
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end
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month_options << ((date.kind_of?(Fixnum) ? date : date.month) == month_number ?
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%(<option value="#{month_number}" selected="selected">#{month_name}</option>\n) :
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%(<option value="#{month_number}">#{month_name}</option>\n)
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)
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end
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select_html("month", month_options, options[:prefix], options[:include_blank], options[:discard_type])
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end
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# Returns a select tag with options for each of the five years on each side of the current, which is selected. The five year radius
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# can be changed using the <tt>:start_year</tt> and <tt>:end_year</tt> keys in the +options+. The <tt>date</tt> can also be substituted
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# for a year given as a number. Example:
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#
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# select_year(Date.today, :start_year => 1992, :end_year => 2007)
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def select_year(date, options = {})
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year_options = []
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y = date.kind_of?(Fixnum) ? (y = (date == 0) ? Date.today.year : date) : date.year
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default_start_year, default_end_year = y-5, y+5
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(options[:start_year] || default_start_year).upto(options[:end_year] || default_end_year) do |year|
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year_options << ((date.kind_of?(Fixnum) ? date : date.year) == year ?
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"<option selected=\"selected\">#{year}</option>\n" :
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"<option>#{year}</option>\n"
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)
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end
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select_html("year", year_options, options[:prefix], options[:include_blank], options[:discard_type])
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end
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private
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def select_html(type, options, prefix = nil, include_blank = false, discard_type = false)
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select_html = %(<select name="#{prefix || DEFAULT_PREFIX})
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select_html << "[#{type}]" unless discard_type
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select_html << %(">\n)
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select_html << "<option></option>\n" if include_blank
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select_html << options.to_s
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select_html << "</select>\n"
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return select_html
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end
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def leading_zero_on_single_digits(number)
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number > 9 ? number : "0#{number}"
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end
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end
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class InstanceTag #:nodoc:
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include DateHelper
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def to_date_select_tag(options = {})
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defaults = { :discard_type => true }
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options = defaults.merge(options)
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options_with_prefix = Proc.new { |position| options.update({ :prefix => "#{@object_name}[#{@method_name}(#{position}i)]" }) }
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date = options[:include_blank] ? (value || 0) : (value || Date.today)
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date_select = ""
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if options[:month_before_year]
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date_select << select_month(date, options_with_prefix.call(2)) unless options[:discard_month]
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date_select << select_year(date, options_with_prefix.call(1))
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else
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date_select << select_year(date, options_with_prefix.call(1))
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date_select << select_month(date, options_with_prefix.call(2)) unless options[:discard_month]
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end
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date_select << select_day(date, options_with_prefix.call(3)) unless options[:discard_day] || options[:discard_month]
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return date_select
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end
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def to_datetime_select_tag(options = {})
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defaults = { :discard_type => true }
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options = defaults.merge(options)
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options_with_prefix = Proc.new { |position| options.update({ :prefix => "#{@object_name}[#{@method_name}(#{position}i)]" }) }
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datetime = options[:include_blank] ? (value || 0) : (value || Time.now)
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datetime_select = select_year(datetime, options_with_prefix.call(1))
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datetime_select << select_month(datetime, options_with_prefix.call(2)) unless options[:discard_month]
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datetime_select << select_day(datetime, options_with_prefix.call(3)) unless options[:discard_day] || options[:discard_month]
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datetime_select << " — " + select_hour(datetime, options_with_prefix.call(4)) unless options[:discard_hour]
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datetime_select << " : " + select_minute(datetime, options_with_prefix.call(5)) unless options[:discard_minute] || options[:discard_hour]
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return datetime_select
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end
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end
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end
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end
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