Experiencing a wicket problem to do with UI state corruption when using ajax
tabbed panel. When the ajax links are rapidly clicked in succession various
validation errors appear relating to panels that are hidden, form component
drop downs lose their display UI values and UI state basically becomes
"v.confused". Have not observed this behavior elsewhere but somehow it seems
like the ajax requests are not stacking correctly or at least are losing
synch with the UI rerendering somehow.
Below are all the steps (in brevity) so far attempted and some unanswered
questions I still have:-
(1) Tried IAjaxIndicatorAware on individual form components and overridden
tabbed panel links. Used this in conjunction with a server side request
throttler. Basically wrote a timer class that intercepts onsubmit requests
and rejects (returns without processing further) on any entered with given 2
second interval using standard Java api class implementations. This
approach does actually work but doesn't explain why we're having this
problem in first place?
(2) Tried a DIV interceptor approach hooking into
Wicket.Ajax.registerPreCallHandler, postcall, and failure. The idea was to
cover the entire screen with a transparent div whilst asynch call being
made - however, problematic using IE 6 but works with firefox. Essentially,
seems IE deals with windowed and windowless components and certain html
form components are windowed such as select. z-indexes are not respected
between the two types and therefore setting div z-index higher than select
z-index doesn't work. tried workaround using an iframe (which covers both
z-indexes in IE6) but iframe transparency issues meant access to underlying
form component.
(3) Looked at wicket-ajax.js - was interested with configuration of the
channels settings - but unsure how to get an appropriate configuration fix.
There is an indicator between setting which gets read by reading out of a
regex a character value of either 'd' or 's' where from what i can see 's'
ensures requests are stacked. Found some help in an older newsgroup which
mentions that "{wicket has "ajax channels" with different channel modes such
as queue/disregard. that way you can disable certain groups of components
only by assigning them to the same ajax channel.}" Looking at the wicket
java api i couldn't manage to find any handle to setting this flag up. Is
this a direct wicket-ajax.js edit and if so then my question would be "What
is an "elegant" way to override the default to use 'd'?"
(4) Finally, switched the asynch flag to "false" by editing wicket-ajax.js
directly (this.type in request prototype class). This resolved the original
problem but uncertain what the consequences of doing this are. Is this safe
and is there any Java api accessible means to do this? In firefox by
inspecting ajax responses via an ajax plugin, it seemed to indicate ajax
requests yet the page is flickering on rerender much like a full page
resubmission would. Does ajax submission still work or is it the main UI
thread that now handles form submissions?
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