Field calculations

[dunbarx at aol.com]

Vaughn.


This structure dates back 25 years. Only the first handler in a script will execute. This is actually useful, since you can write variations, and select the one you want to test, simply by commenting out the first line of the others.


It just takes getting used to.


But if you think about it, what would you, or the engine, make of two "mouseUp" handlers in a single button script? Execute both? Just the second? The sixth? No way, only the first one. So the way it works actually makes sense. You do have to know about that little fact, of course.


Craig



-----Original Message-----
From: Vaughn Clement <vclement at gmail.com>
To: How to use LiveCode <use-livecode at lists.runrev.com>
Sent: Wed, Sep 11, 2013 7:47 pm
Subject: Re: Field calculations


Hi Mark

I have been reading everything for LiveCode for weeks, and I am reading the
LC Academy up to chap 19, and thatis the first time this has come up about
more than one mouseUp handler? Is this for the one control, button, card or
only one for any control.

Thank you

Vaughn Clement

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On Wed, Sep 11, 2013 at 4:39 PM, Mark Wieder <mwieder at ahsoftware.net> wrote:

> Vaughn-
>
> Wednesday, September 11, 2013, 4:30:04 PM, you wrote:
>
> > I kept changing things until it worked. I had to make the button script
> > with only one mouseUp script and nothing else and it worked. I had a
> script
> > to set the card id to a field in a second mouseUp script. But that was
> > after doing all kinds of similar scripts and it did not work.
>
> Ah. You can't have two mouseUp handlers in the same control. The
> mouseUp handler catches the event coming from the system when the
> mouse button is released on the button. If you want the mouseUp
> handler to do more work, just add more code into the single handler.
>
> --
> -Mark Wieder
>  mwieder at ahsoftware.net
>
>
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