Re: [WebMacro-user] seeking 'if' condition with form '($myVar in $myList)'...

[Keats K. <ke...@xa...>]

The $List tool can solve your problem.

The "Ljava.lang.Object" is the JVMs polite way of telling you that 
$myList is an array of Objects, which is what WMScript uses to implement 
the square-bracket list syntax. 

This has always been a pain point in WMScript, but it is not easy to fix 
without breaking a lot of legacy templates.  The $List tool gives you a 
pretty convenient workaround.  You can see its methods in the JavaDocs:

http://www.webmacro.org/api/org/webmacro/servlet/ListUtil.html.

You can say:

   #if ($List.contains($myList,$compositeObj.name)) { ...

or

   #if ($List.toList($myList).contains($compositeObj.name)) { ...

or, using the function version:

   #if ($toList($myList).contains( ...

or

   #set $myList = $toList($myList)
   #if ($myList.contains(...

etc.

Hope this does it for you.

- Keats


Peter Smith wrote:

>I want to be able to find out if $myVar is in $mylist.
> Is there syntax to handle this w/ WM template
>scripting?
>
>  ## Here is my list
>  #set $myList = [ "one", "two", "three" ]
>
>  ## Here is the variable I'm looking for
>  #set $myVar = "two"
>
>  ## I want to do this
>  #if ( $myVar in $myList ) {
>    do something...
>  }
>  #else {
>    do something else...
>  }
>
>In my particular case, $myList is a java.util.Vector
>made up of composite objects - each object has a name,
>value, etc.  To keep maintenance simple, I wanted to
>avoid doing a multiple-condition 'if' statement like
>this:
>
>   #if ( ($myVar==$possibility1)  ||
>         ($myVar==$possibility2)  ||
>         ($myVar==$possibility3) 
>         etc.                  ) ) {
>     do something...
>   } 
>   #else...
>
>
>To give a fuller picture, my close-to-ideal
>pseudo-code looks like this:
>
>  #set $myList = [ "one", "two", "three" ]
>
>  #foreach $compositeObj in $someRuntimeList {
>
>    #if ($compositeObj.name in $myList) {
>      do something
>    }
>    #else {
>      do something else...
>    }
>
>  }
>
>I've tried to turn around the 'if' condition using
>this syntax:
>
>    #if ($myList.contains($compositeObj.name)) {
>
>but I get a 'NoSuchMethodException on a
>Ljava.lang.Object'.
>
>Thanks for any pointers.
>
>I'm willing to do some coding if we wanted to add this
>to the codebase - only, not sure if I could even
>understand enough of the engine (Expression.java
>maybe?) to know where to start hacking.
>
>
>
>  
>