Creating a JavaScript cookie on a domain and reading it across sub domains

Question

Below is a JavaScript cookie that is written on the user s computer for 12 months   After we set the cookie on our main domain such as example com  should the user visit a subdomain like test example com  we need to continue to identify the activity of the user across our  test  subdomain   But with the current code  as soon as they leave www example com and visit test example com  they are no longer flagged as  HelloWorld    Would anyone be able to help with my code to allow the cookie to be read across subdomains    lt script type  text javascript  gt    var cookieName    HelloWorld     var cookieValue    HelloWorld     var myDate   new Date      myDate setMonth myDate getMonth     12     document cookie   cookieName        cookieValue     expires     myDate   lt  script gt

User · Answer

You can also use the Cookies API and do  browser cookies set     url   example com     name   HelloWorld     value   HelloWorld     expirationDate  myDate    MDN Set   Method Documentation

User · Answer

Just set the domain and path attributes on your cookie  like    lt script type  text javascript  gt  var cookieName    HelloWorld   var cookieValue    HelloWorld   var myDate   new Date    myDate setMonth myDate getMonth     12   document cookie   cookieName        cookieValue     expires     myDate                        domain  example com path      lt  script gt

User · Answer

Here is a working example    document cookie    testCookie cookieval  domain       location hostname split      reverse   1           location hostname split      reverse   0       path      This is a generic solution that takes the root domain from the location object and sets the cookie   The reversing is because you don t know how many subdomains you have if any

User · Answer

You want   document cookie   cookieName        cookieValue     domain  example com path   expires     myDate    As per the RFC 2109  to have a cookie available to all subdomains  you must put a   in front of your domain   Setting the path   will have the cookie be available within the entire specified domain aka  example com

[javascript] Creating a JavaScript cookie on a domain and reading it across sub domains

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