(gorails) automatically detects the user's time zone, using JavaScript's Jszt library.

Traditional methods See: http://www.cnblogs.com/chentianwei/p/9369904.html

?? : Two methods Finally, a similar before_action:set_time_zone in the controller is needed to assign the time zone to the current browser.

Real-time method, according to the user's time zone setting:

1. Rails new-m template.rb timezone use template, name with timezone
2. yarn Add jstz #一个javascrit TimeZone Library can automatically detect and set the user's time zone.
3. Rails g Migration Addtimezonetousers Time_zone
4. Rails Db:migrate
5. Atom. After opening javascript/packs/application.js (already installed using Webpacker)
6. Enter import Jstz from ' Jstz '
   1. Import Jstz from ' Jstz '
   2. Const TIMEZONE = Jstz.determine ()
   3. Console.log (Timezone.name ())
7. App/views/shared/_head.html.erb
8. Modify line 8th and change to Javascript_pack_tag method.
10. On the User registration page, the F.time_zone_select:time_zone option allows you to see the time zone selection on the inspect.
11. Set the cookie in Javascript/packs/application.js:

Create a function--set a cookie:

function Setcookie (name, value) {

var expires = new Date ()

Expires.settime (Expires.gettime () + (24*60*60*1000)) #1000天后到期

document.cookie = name + ' = ' + value + '; expires= ' + expires.toutcstring ()

}

Use this function:

Setcookie ("TimeZone", Timezone.name ())

Parsing these are JavaScript usages, create, Read a Cookie with JavaScript:

var x = Document.cookie The associated cookie for the current document.

Document.cookie = Newcookie sets a new cookie.

Example:

document.cookie= "Username=john Doe;   Expires=thu, 12:00:00 UTC; path=/";

Extended--javascript Cookies:

Https://www.w3schools.com/js/js_cookies.asp

　　

12. Define a method in the controller in APPLICATION.RB Bowser_time_zone

def Browser_time_zone

#根据cookies来找到对应的时区, if not, use Time.zone as the default, arbitrary error, and rescue using the default

Browser_tz = Activesupport::timezone.find_tzinfo (Cookies[:timezone])

activesupport::timezone.all.find{|zone| Zone.tzinfo = = Browser_tz} | | Time.zone

Rescue Tzinfo::unknowntimezone, Tzinfo::invalidtimezoneidentifier

Time.zone

End

Helper_method:browser_time_zone #添加helper方法

The variable Browser_tz is an object such as #<tzinfo::D atatimezone:america/chicago>, which compares the properties TZInfo of all TimeZone objects.

#<activesupport::timezone:0x00007f97f26b0058 @name = "American Samoa", @utc_offset =nil, @tzinfo =#<tzinfo: :D atatimezone:pacific/pago_pago>>

13. On the User registration page, the F.time_zone_select:time_zone option can be added with this browser_time_zone helper method

<%= F.time_zone_select:time_zone, nil, Default:browser_time_zone.name%>

14. The browser displays time zones: Controller adds a before_action:set_time_zone, if:: User_signed_in?

def Set_time_zone

Time.zone = Current_user.time_zone

End

15 has a related gem ' local_time ' available.

(gorails) automatically detects the user's time zone, using JavaScript's Jszt library.