javascript将变量传递到另一个页面

Question

Ok, Here is what I want to do. I have a very complex database. I am reading from the database using php and store the data in a variable (Ajax). Now when I go to another page I loose the variable.

Here is what I know (not sure how correct I am): the scope of a variable is the function it is in. If not specified the scope will be the window object (which changes for every page). Is there any higher level than window? (something like session in php but in the client side)

Answer 1

There are many way to storage your variable such as:

1. Use client cookie
2. Use server session or cookie
3. HTML5 storage
4. Query string such as ?var1=blah&var2=blah

Answer 2

Maybe you can use cookie. Actually php sessions also utilize cookie as well. As far as I know the scope beyong window is cookie.

Or you can use some HTML5 technologies, such as WebStorage , but that may break on some old browsers.

Answer 3

Normally I would avoid storing state in javascript and instead cache the result on the server. Some sort of application or user level cache might be recommended in this case, so that the other page may benefit from the db result. If it's per user then I would look into session. Otherwise it might be better to store it at the application level in some sort of cache