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<H2><A NAME="SECTION00065000000000000000">Example of the <tt>ShowPage</tt> function</A></H2>
<P>
<A NAME="ShowPage"> </A>
To illustrate interpage dependencies, here comes an example. In this
example a program exists, which has two different versions, that only
differs a bit. The module programmer has decided that he will configure
both versions with the same module. On a page called <tt>Version</tt>
the user can select which version he uses with a radio button. This may
look like this:
<P>
<PRE>proc version {} {
# version
Radio ver -text "version of the program" -entries {6 6.01}
}</PRE>
<P>
No <tt>ShowPage</tt>, <tt>Change</tt>, <tt>Init</tt>,
<tt>PageEnd</tt> or <tt>Save</tt> functions is necceary on this
page, as it doesn't generate any code, and the radio element is always
enabled.
<P>
On a different page an element exist, say a <tt>CheckBox</tt> with label
<tt>Use feature 42</tt>. This option is only avilable in version 6.01 of
the program, and should therefore be disabled, when version 6 is
selected. No code should be generated for this option if version 6 is
selected.
<P>
This page may look like this:
<PRE>proc page {} {
# page
CheckBox feature -text "feature 42"
ShowPage {
if {[set version@ver(name)] == "6.01"} {
Disable feature
} else {
Enable feature
}
}
Save {
if {[set version@ver(name)] != "6.01"} {
print "use feature42: $feature"
}
}
}</PRE>
<P>
As you can see, no <tt>Change</tt> function exists, since there is no
intrapage dependencies.
<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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