Persist javascript variables across pages

Question

Is there a way we can persist javascript variables across various pages  Suppose in Page A I am setting window someVar   5  Then I move to Page B  via clicking a hyperlink in A  and do something like alert window someVar  -- I should get a message box displaying 5  Is there a technique to persist someVar as such

User · Answer

You can persist values using HTML5 storage  Flash Storage  or Gears  The dojo storage library provides a nice wrapper for this

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I would recommend you to give a look to this library    PersistJS   I really like it  it supports a variety of storage backends  from cookies to HTML5 storage  Gears  Flash  and more      its usage is really transparent  you don t have to know or care which backend is used the library will choose the right storage backend depending on the browser capabilities

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You could use the window   s name window name to store the information  This is known as JavaScript session  But it only works as long as the same window tab is used

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I recommend web storage  Example      Storing the data  localStorage setItem  variableName   Text       Receiving the data  localStorage getItem  variableName     Just replace variable with your variable name and text with what you want to store  According to W3Schools  it s better than cookies

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For completeness  also look into the local storage capabilities  amp  sessionStorage of HTML5  These are supported in the latest versions of all modern browsers  and are much easier to use and less fiddly than cookies   http   www w3 org TR 2009 WD-webstorage-20091222   https   www w3 org TR webstorage    second edition   Here are some sample code for setting and getting the values using sessionStorage and localStorage         HTML5 session Storage  sessionStorage setItem  variableName   test     sessionStorage getItem  variableName        HTML5 local storage  localStorage setItem  variableName   Text       Receiving the data  localStorage getItem  variableName

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You can use http   rhaboo org as a wrapper around localStorage  It stores complex objects but doesn t merely stringify and parse the whole thing like most such libraries do  That s really inefficient if you want to store a lot of data and add to it or change it in small chunks  Also  JSON discards a lot of important stuff like non-numerical properties of arrays    In rhaboo you can write things like this   var store   Rhaboo persistent  Some name     store write  count   store count   store count 1   1    var laststamp   store stamp   store stamp toString      never   store write  stamp   new Date      store write  somethingfancy       one    man    went      2   mow     went     2    mow    a    meadow                  store somethingfancy went 1  mow write 1   lawn    console log  store somethingfancy went 1  mow 1       says lawn   BTW  I wrote rhaboo

User · Answer

Yes  using Cookies  But be careful  don t put too much in them  I think there is a limit at 4kb   But a few variables are ok   If you need to store considerably more than that  check out  Annie s great tips in the other answer  For small time data storage  I would say Cookies are the easiest thing   Note that cookies are stored client side

[javascript] Persist javascript variables across pages?

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