jquery - Cross tab variable in javascript without server interaction -

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i developing chat system , got question ask you.

i dont think possible since see similar behaviour in websites, know how access variable defined/modified in other tab? mean don't want send server. how 

  var myvalue=getvalueinavailabletab(varname);

if not possible, how facebook know if chat dialog has been closed in tab? post event on server , retrieve it?

i sorry not stealing behaviours best example explain want do.

in circumstances, answer question cannot access javascript variable in tab. there other ways pass data between tabs, however:

  • you may create browser extension has functionality want. though different browser frameworks have different limitations upon accessing code of pages open.
  • if windows guaranteed opened same parent window, may use window.parent or window.opener
  • if both tabs same origin site, may have 1 tab store value in cookie, , have other tab retrieve value.

these ways in may accomplish need without server interaction. i'm not sure method facebook uses, however.


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