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<H1><A NAME="SECTION00080000000000000000">Referencing variables in other configuration files</A></H1>
<P>
<A NAME="refering_vars_on_other_pages"> </A>
In the
<A HREF="node45.html#Init">Init function</A>,
<A HREF="node44.html#Change">Change function</A>,
<A HREF="node46.html#PageEnd">PageEnd function</A>,
<A HREF="node48.html#ShowPage">ShowPage function</A> and
<A HREF="node52.html#Save">save function</A> it
is possible to <EM>see</EM> variables from other configuration
pages. This means that you can read and write them, and
enable/disable the elements they belong to.
<P>
<H3><A NAME="SECTION00080100000000000000">Ordinary variables</A></H3>
<P>
The variables are referred to as <EM>function name</EM>@<EM>variable
name</EM>. If you eg. have a variable called count on the menupage backup,
then you can do the following:
<UL><LI> <code>set backup@count 1</code><LI> if <code>{${backup@count} == 1} {...}</code><LI> <code>Disable backup@count</code>
</UL>
Remember braces arround the variable name, when you read, since @ is a
variable delimiter in TCL.
<P>
If the variable is an associative array (
<A HREF="node23.html#Menu">Menu</A>,
<A HREF="node24.html#Radio">Radio</A>,
<A HREF="node22.html#ListBox">ListBox</A>),
<A HREF="node11.html#ComboBox">ComboBox</A>
the TCL syntax is a bit different, when you <EM>read</EM> the variable:
<UL><LI> <code>if {[set backup@count(index)] == 1} {...}</code>
</UL><H3><A NAME="SECTION00080200000000000000">Variable in extentries</A></H3>
<P>
If the variable is in an extended entry, you have to do a forevery on
the variable with the <EM>function@</EM> prefix, and the variables will
be named with the <EM>function@</EM> prefix too. If we say we have an
extentry called <EM>alias</EM> on the menupage <EM>misc</EM>, and it
consists of <EM>name</EM> and <EM>value</EM>, then it could look like this:
<PRE> forevery misc@alias {
if {${misc@name} == ""} {
Disable misc@value
}
}</PRE>
<P>
<H3><A NAME="SECTION00080300000000000000">Variable in fillOut</A></H3>
<P>
If you want to refer to a fillOut element on another page, the save,
change, pageEnd and init functions, foreach fillOutElm, have to be a bit
different from what we already have learned.
<P>
Instead of just referring to the variable, you have to write <TT>[expand</TT> <EM>
variable_name</EM><TT>]</TT> and for associative arrays <TT>[expand</TT> <EM>
variable_name variable_index</EM><TT>]</TT>. Here's an example which will
clarify the matter.
<PRE> CheckBox checkbox -text "Just a checkbox"
Radio radio \
-text radio -entries { "option 1" "option 2"}
FillOutElm fill -entries checkbox radio \
-save {
if {[expand checkbox] == 1} {
print "radio = [expand radio name]"
}
}</PRE>
<P>
If referencing to this page wasn't nessecary, you could just have
written:
<P>
<PRE> FillOutElm fill -entries checkbox radio \
-save {
if {$checkbox == 1} {
print "radio = $radio(name)"
}
}</PRE>
<P>
<BR> <HR>
<P><ADDRESS>
<a href="http://www.imada.ou.dk/~blackie/">Jesper Kjær Pedersen</a> <<a href="mailto:blackie@imada.ou.dk">blackie@imada.ou.dk</a>><BR>
Wed Oct 2 13:29:53 MET DST 1996
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