Nested if statements.

[robert swanson]

I'm trying to write a complex function which uses nested if statements like the clip below

elseif substr(lang,0,2) = "da" then
  session.countrycode="Danish"
elseif substr(lang,0,2) = "de" then
{
 if substr(lang,3,2) = "at"   then
  session.countrycode="German / Austria"
 elseif substr(lang,3,2) = "ch" then
  session.countrycode="German / Switzerland"
 elseif substr(lang,3,2) = "li" then
  session.countrycode="German / Liechtenstein"
 elseif substr(lang,3,2) = "lu" then
  session.countrycode="German / Luxembourg"
else 
     session.countrycode="German / Germany"
end if
}
elseif substr(lang,0,2) = "el" then
  session.countrycode="Greek / Greece"
elseif substr(lang,0,2) = "en" then

I get the following error
ERROR: Mismatched end of loop or if-block
I can't find anything wrong and the help for IF THEN ELSE doesn't mention whether nesting is allowed.

[JerryBrightbill]

You don't need the curly brackets in Alpha xbasic

elseif substr(lang,0,2) = "da" then
	session.countrycode="Danish"
elseif substr(lang,0,2) = "de" then
	if substr(lang,3,2) = "at" then
		session.countrycode="German / Austria"
	elseif substr(lang,3,2) = "ch" then
		session.countrycode="German / Switzerland"
	elseif substr(lang,3,2) = "li" then
		session.countrycode="German / Liechtenstein"
	elseif substr(lang,3,2) = "lu" then
		session.countrycode="German / Luxembourg"
	else 
		session.countrycode="German / Germany"
	end if
elseif substr(lang,0,2) = "el" then
	session.countrycode="Greek / Greece"
elseif substr(lang,0,2) = "en" then

[csda1]

Robert,

You also need to use "ELSE IF", not "ELSEIF".

[Lenny Forziati]

Ira, both ELSEIF and ELSE IF are valid.

Robert,

You also need to use "ELSE IF", not "ELSEIF".

[Lenny Forziati]

You don't need the curly brackets in Alpha xbasic

Not only do you not need them, you cannot use them. They are not valid Xbasic syntax and you must remove them.

[csda1]

Ira, both ELSEIF and ELSE IF are valid.

I haven't checked recently (and can't check as I am on the road), but I believe some earlier versions returned syntax errors with ELSEIF (and for me, I always choose more version-independent syntaxes unless there is another benefit)

Is this a recent change?

[CALocklin]

I've been using it since version 1. (I usually prefer the CASE structure for multiple choices but sometimes this gets used - especially when adding to an existing IF.) From the A5 version 1 Help files:

IF Logical Expression1 [THEN]
[Statements1]
[ELSEIF Logical Expression2 [THEN]
[Statements2] ]
...
[ELSEIF Logical ExpressionN [THEN]
[StatementsN] ]
[ELSE
[Statements] ]
END IF

The help section titled 'IF ... THEN ... ELSE' still shows this construction although some of the newer examples use 'else if'. (All lower case now - I think that makes things very difficult to read. As far as I'm concerned, it's like saying, "It saves me time when typing because I don't have to waste a couple milliseconds pressing the 'shift' key and I don't mind wasting even more time later due to the fact that it's harder to read. Of course, that's a personal opinion and I'm sure many disagree.)

[robert swanson]

Function not valid

Thanks everyone. I got it working in the interactive window and defined it as a function. It returns two strings giving the language and country in words from the Request.AcceptLanguage from the browser.

However when I use it on a A5w page i get the following error. It should return English and Canada.


500 Internal Server Error
Script Error
Error:Script: /ispinfo.a5w line:39
lcc = lang_country("en-ca")
Function is not recognized


--------------------------------------------------------------------------------

Alpha Five/7.0 Build/3856-2062 at ROBERT Port 81

BTW the function shows up in the code section for the DB

[JerryBrightbill]

The WAS can not see a function defined in a database, since the web server can be running with no database. The alternatives are to put the function on the page in xbasic code or create an aex file. The aex file can be in the addins_installed folder, which will make it available to the web server and any database, or the aex can be loaded by the page code. The help file covers creating and using an aex.

[Lenny Forziati]

I addiiton to the 2 methods suggested by Jerry, you can also place your function in its own A5W page and use the a5w_include() function to include it on any pages that need it. I typically create a functions.a5w that defines all of the functions for my app and then include it in the A5W pages that need it.

The WAS can not see a function defined in a database, since the web server can be running with no database. The alternatives are to put the function on the page in xbasic code or create an aex file. The aex file can be in the addins_installed folder, which will make it available to the web server and any database, or the aex can be loaded by the page code. The help file covers creating and using an aex.

[robert swanson]

Thankyou gentlemen

I've put it on the one page that uses it.