Hey Stefan,
2012/1/31 Stefan Ruppert <s...@myarm.com>:
> Hi all,
>
> I want to use a loading indicator to measure the loading time of a
> WebRequest!?
The actual place to measure the loading time is best done in an
overloaded WApplication::notify(), measuring the time around the base
call to notify().
But then you are too late to show this number to the user, since the
rendering phase will already be finished. It's a bit a circular thing:
trying to measure how long it takes to render and render the result of
this measurement.
> Our web application is a frontend to a database containing a huge amount
> of data. Therefore we want a generic way to measure and present the
> loading time to the user. The idea I had is to implement a special
> loading indicator and reimplement setHidden() method taking a start
> timestamp when the widget is shown and a stop timestamp when the widget
> is hidden again... But this does not work.
As you imagine, indeed, the loading indicator is a client-side affair
since it will show when the server takes too long to respond.
However, Wt does this by optimizing setHidden() using "stateless slot
learning" of show() and hide().
You can thus reimplement setHidden() in a special loading indicator
and use doJavaScript() -- these calls will be also be "pre-learned" as
client-side JavaScript.
Thus something like:
void MyLoadingIndicator::setHidden(bool hidden)
{
if (!hidden) {
doJavaScript("...");
} else {
doJavaScript("...");
}
WLoadingIndicator::setHidden(hidden);
}
The JavaScript could do whatever you want, including modifying the
loading indicator text or anything else, but it will be purely
javascript.
Regards,
koen
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