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Help with if condition

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malojo

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  • »malojo« ist der Autor dieses Themas

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1

Dienstag, 10. November 2009, 19:28

Help with if condition

Hi,



I have defined my own variable in that style:



Quellcode

 
1

 <hoteldata name="hotel1" hname="aName" hurl="aUrl" />




As I want to change them from outside I want to do something if the variable exist or not.



Quellcode

 
1
2

 if(get(hoteldata[hotel1].hname) != null ,additem(get(hoteldata[hotel1].hname), openurl(get(hoteldata[hotel1].hurl),_blank)) 
);




What I want to is to add that item if the variable exists. If it doenst exist I do not want to do that.

If I delete the variable the item is still added showing "null" even if I did a check that I do want to show it if it is not null.



Any ideas what I've done wrong?



Regards

michel

Profi

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Wohnort: ANDORRA

Beruf: TV

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2

Mittwoch, 11. November 2009, 09:22

Hi malojo,

I have tried your code and the problem seems to be that the if action is not resolving correctly the null value... trace(hoteldata[hotel1].hname
) returns null... get(hoteldata[hotel1].hname) returns null... but if(hoteldata[hotel1].hname != null , ....) does not resolve correctly... it is like If() is not checking for the "null object" but check for a value... and it resolve that this value is not equal to null....(hope that the above has some sense *rolleyes* )

Perhaps that is a bug ...

So, I think you can resolve this, in setting the value to "null" and check to to the value != "null". Like this:

Quellcode

 
1
2
3
4

<hoteldata name="hotel1" hname="null" hurl="null" />
....
if(get(hoteldata[hotel1].hname) != "null" ,additem(get(hoteldata[hotel1].hname), openurl(get(hoteldata[hotel1].hurl),_blank)) );
....


Hope this can help.

SAlut.

malojo

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  • »malojo« ist der Autor dieses Themas

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3

Mittwoch, 11. November 2009, 09:56

Thanks for the hint.

It seems that there is ( besides checking for null ) another issue with the get function.



Even if I do the following



Zitat

if(get(hoteldata[hotel1].hname) == "123"

assuming that hname is 123 I get false.

If I do

Zitat

if( hoteldata[hotel1].hname != "123"

I get what I want.

michel

Profi

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4

Mittwoch, 11. November 2009, 10:08

Hi malojo,

Yes, you are right *g* ...
if(variable == "value" ,do something , else another thing)
so, if hname = "123":
if(get(hoteldata[hotel1].hname) == "123", .....)
is like:
if( 123 = "123",....)
123 is a variable (not defined in this case), so the condition is false *rolleyes* ...

SAlut.

malojo

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5

Mittwoch, 11. November 2009, 10:12

Oh ehm *g* *cool* *rolleyes* *rolleyes* *whistling*

Thanks for the explanation.



Regards.

klaus.krpano

Administrator

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6

Mittwoch, 11. November 2009, 23:06

Zitat

if(get(hoteldata[hotel1].hname) != null ,additem(get(hoteldata[hotel1].hname), openurl(get(hoteldata[hotel1].hurl),_blank))
);
Hi,

the if() action works a bit different at the moment:
- get(var) can't be used, it automatically uses the content of a variable,
- if a variable doesn't exists, the name of the given variable is used,

e.g. when hname is set to "xyz":

Quellcode

 
1

if(hoteldata[hotel1].hname != null , ...)
the if will become to:

Quellcode

 
1

if(xyz != null , ...)
but when hoteldata[hotel1].hname was NOT set, the if will become finally to:

Quellcode

 
1

if('hoteldata[hotel1].hname' != null , ...)


I know - not ideally!
the reason for that behavior was that originally there were no quotes (') for strings,
so everything could be a either a string or a variable,
I'm still thinking about to change that...

best regards,
Klaus

malojo

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  • »malojo« ist der Autor dieses Themas

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7

Donnerstag, 12. November 2009, 10:11

Good to know this. Now that I do I won't have problems with it.



Thanks klaus.

PanAustria

Schüler

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8

Mittwoch, 18. November 2009, 11:37

My temp. workaround for "does the plugin/hotspot exist?" in the current scene is
eg.
if(hotspot[video].name == video, dosomething, dosomethingelse);

Seems a little bit annoying to "compair a plugins attribute against this attribute itself"
but it was the ONLY reliable way to ensure its existance -
If the plugin/hotspot was not defined before the if-condition delivers a "FALSE"-value.
You surely could use any other attribute of it instead of its name but using the name ensures to have always the right value to compare with...

Any other/better method?
best regards from www.PanAustria.com

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