topic Re: Trigger on variable in QlikView

Trigger on variable

Nino — Wed, 25 Nov 2020 16:16:04 GMT

Happy new year to everybody!

My first 2019 problem: I'm studying the trigger behavior and I'm not able to understand why the variable tied to a fields change but the relative triggers don't do the same.

Can someone have a look at my example, pls?

Thank you so much.

Re: Trigger on variable

rwunderlich — Tue, 01 Jan 2019 22:12:55 GMT

What you are seeing is as designed. The trigger is only fired for user initiated actions, not changes performed by Actions. Your field OnChange action sets a variable but this will not trigger the onChange for the variable. This is to prevent an endless cascade of triggers. Imagine if in your example, the field OnChange trigger changed a variable and the variable OnChange trigger changed the field. would They ping-pong back and forth forever.

-Rob
http://masterssummit.com
http://qlikviewcookbook.com
http://www.easyqlik.com

Re: Trigger on variable

Nino — Wed, 02 Jan 2019 06:45:16 GMT

Hi Rob,

thak you for the explanation!

So the next question is: what about if I have to link and action to the change of a variable or a field NOT as a consequence of a direct change made up by the user?

Thanks.

Re: Trigger on variable

rwunderlich — Wed, 02 Jan 2019 15:35:44 GMT

I'm not sure it's possible with Actions. More likely you could use conditional logic or set analysis in your expression to deal with it.

-Rob