[jira] [Commented] (TAP5-1193) tapestry.js prevents using the back/forward browser cache

["Howard M. Lewis Ship (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/TAP5-1193?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13014308#comment-13014308 ] 

Howard M. Lewis Ship commented on TAP5-1193:
--------------------------------------------

A challenge; that code was place there for a reason ... I can't remember the exact details, but it was a flash of spurious errors when page navigation and Ajax responses got into some kind of race condition.

> tapestry.js prevents using the back/forward browser cache
> ---------------------------------------------------------
>
>                 Key: TAP5-1193
>                 URL: https://issues.apache.org/jira/browse/TAP5-1193
>             Project: Tapestry 5
>          Issue Type: Bug
>          Components: tapestry-core
>    Affects Versions: 5.1.0.4
>            Reporter: Dan Adams
>
> At the bottom of tapestry.js is the following:
> // Ajax code needs to know to do nothing after the window is unloaded.
> Event.observe(window, "beforeunload", function()
> {
>     Tapestry.windowUnloaded = true;
> });
> Assume you have a page that does this:
>  - loads in some initial state
>  - user does something causing a ajax request that changes the DOM
>  - user clicks a link to go to another page
>  - user clicks back button
> rather than getting the state of the page before they left the user will get the original state of the page including the DOM and js state and the load handlers will be run. Using the hash method of maintaining ajax history (or maybe a cookie) is really not an option in this case because the DOM is out of date. You'd need to do an extra ajax request to the server to restore the state and the user experience would be really poor.
> There needs to be at least of the option of disabling this for pages that need this behavior.
> See http://stackoverflow.com/questions/158319/cross-browser-onload-event-and-the-back-button

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