[Wt-interest] Unwanted Page Refresh Try 2

[Aaron Laws]

I created a minimum working example of what I'm talking about, and it's
attached. It actually compiles and runs!

Although it's 135 lines, I had to get a web server and DBO up and going.
Really, it's *remarkable* that it's so short and in C++! Anyway, when I
click the pushbutton created on line 124, it looks like the session.find on
line 112 is causing the page to refresh. I'm not sure why a Wt::Dbo call
would cause the page to reload? Or would cause the browser to issue a new
GET.

Any ideas? Thanks, all!

In Christ,
Aaron Laws

In this code: http://pastie.org/10347062, when I uncomment line 36 and
click the new ingredient button, the page refreshes, and I'm not sure why.
When I comment line 36, no refresh. Of course, the ingredient isn't added
to the dbo collection, but the GUI element shows up on the page, etc.
Is there anything about getting a non-const pointer to an object, and
adding something to a Wt::Dbo::collection on that object that would cause a
page to refresh? It has me a bit frazzled. Let me know if you have any
other questions.
In Christ,
Aaron Laws

[Koen Deforche]

Hey,

When, during event handling, an uncaught exception is thrown, then Wt
will print out the exception and terminate the session.
The next request from the browser will then trigger a new session to
be created, causing in a page refresh.

In your case, the exception that is being thrown is most likely an
exception from Wt::Dbo that you don't have an active transaction while
you are interacting with the database.

Regards,
koen

Post by Aaron Laws
I created a minimum working example of what I'm talking about, and it's
attached. It actually compiles and runs!
Although it's 135 lines, I had to get a web server and DBO up and going.
Really, it's *remarkable* that it's so short and in C++! Anyway, when I
click the pushbutton created on line 124, it looks like the session.find on
line 112 is causing the page to refresh. I'm not sure why a Wt::Dbo call
would cause the page to reload? Or would cause the browser to issue a new
GET.
Any ideas? Thanks, all!
In Christ,
Aaron Laws

In this code: http://pastie.org/10347062, when I uncomment line 36 and
click the new ingredient button, the page refreshes, and I'm not sure why.
When I comment line 36, no refresh. Of course, the ingredient isn't added to
the dbo collection, but the GUI element shows up on the page, etc.
Is there anything about getting a non-const pointer to an object, and
adding something to a Wt::Dbo::collection on that object that would cause a
page to refresh? It has me a bit frazzled. Let me know if you have any other
questions.
In Christ,
Aaron Laws

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[Aaron Laws]

Post by Koen Deforche
In your case, the exception that is being thrown is most likely an
exception from Wt::Dbo that you don't have an active transaction while
you are interacting with the database.
Regards,
koen

Oh wow...I've been working on this for a while, and I know that I need a
transaction to work with the database...I should have known better, but
you're right!

hanging head in shame

Thank you

Aaron