Sv: Re: [Lift] Executing a function in "previous request"-context
Andreas Joseph Krogh <
andreak@...>
2011-09-01 06:58:02 GMT
På torsdag 01. september 2011 kl 01:27:25 skrev du:
On 09/01/2011 01:17 AM, Andreas Joseph Krogh wrote:
On 09/01/2011 01:10 AM, David Pollak wrote:
On Wed, Aug 31, 2011 at 4:05 PM, Andreas Joseph Krogh
<andreak-S8R3tkJnxyylHtIdYg32fQ@public.gmane.org> wrote:
On 09/01/2011 12:19 AM, David Pollak wrote:
> I can't run your code, so I'll give you the short answer:
>
> object SomeRequestVar extends RequestVar("Hello")
>
> val context snapshot = SomeRequestVar.generateSnapshotRestorer[JsCmd]()
>
> .... // some code that gets executed at some point in the future:
>
> val myJsCmd = snapshot(() => doFunctionThatCalculatesJsCmd)
>
> The doFunctionThatCalculatesJsCmd will be executed with the
> RequestVars snapshotted at the time the generateSnapshotRestorer()
> method is called.
>
> Hope this helps.
Note that it's not restoring any (of mine) RequestVars I'm after, but
maybe Lift uses RequestVars internally to hold some internal state it
then uses to look-up snippet-invications?
Snippets are stored in an internal RequestVar so if you snapshot the RequestVars (the generateSnapshotRestorer() method snapshots *all* requestvars) then you'll get the snippets.
I updated github (in file ProjectSnippet) with code like the above, with
no luck. The snippet-instance is re-used once I try to re-edit an
already edited project (without reloading the page).
Right... aren't you trying to reuse the snippet?
The overall goal is to create new snippet-instances (backing the dialog) *only* when one clicks "New project" or "Edit" on the base page (the page showing the list). Once the dialog is shown I want to reuse the snippet backing it (for validation etc.), but I don't want that instance re-used after closing/saving.
To be more precise: I only want to re-use the snippet backing the dialog (ProjectEditSnippet) when I perform operations "inside" the dialog. This works fine, but after saving, the snippet backing the dialog performs the callback (stored in projectUpdatedCallbackFuncVar, set by another snippet, ProjectSnippet), which re-renders the "Edit-link" and "modified" in the list, the "Edit"-link is rendered in a way that makes Lift reuse the previous snippet-instance, which I don't want.
I've updated the project on github (just now) with what I thought was the correct use of snapshot(), which is a bit simpler than what I tried yesterday. But it's still failing to execute in the context the generateSnapshotRestorer was called.
The problem manifests it self in the following way:
- When the dialog (PopupEditSnippet) calls the function stored in the projectUpdatedCallbackFuncVar it returns JsCmd which replaces some elements on the page (the elements replaced are the last column in the list displaying "modified" and ""Edit"-link).
- The elements on the DOM are updated (one can see the, but the JsCmd is generated in the context of the snippet backing the dialog. This is OK if the JsCmd was to update the DOM inside the dialog, to keep state of the popup, but the HTML generated (which is updated by the JsCmd) is placed on the page in the background so it must be generated in a way that renders links etc. to point to correct context.
Is it clear what I'm trying to achieve?
Thanks.
--
Andreas Joseph Krogh <andreak-S8R3tkJnxyylHtIdYg32fQ@public.gmane.org>
Senior Software Developer / CTO - OfficeNet AS
http://www.officenet.no - mob: +47 909 56 963
Public key: http://home.officenet.no/~andreak/public_key.asc
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