Difference: IfStatements (6 vs. 7)

Revision 707 Jul 2007 - TWikiContributor

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IF Statements

The %IF% construct gives TWiki the power to include content in topics based on the value of simple expressions.

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allows 'X' allows 'Y' is true if web/topic 'X' exists and allows access mode 'Y' for the current user. Web access rights are only checked if there is no topic called 'X'.
istopic istopic 'X' is true if topic 'X' exists
isweb isweb 'X' is true if web 'X' exists
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ingroup 'X' ingroup 'Y' is true if user 'X' is in group 'Y'
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ingroup 'X' ingroup 'Y' is true if user 'X' is in group 'Y'. 'X' can be a login name or a wikiname.
 
defined True if a preference variable or url parameter of this name is defined.
$ expands a URL parameter or TWikiVariable name. Plugin handlers are not called. Built-in variables and user-defined preferences are supported. You can pass a limited subset of parameters to TWiki variables by enclosing the variable name in single quotes; for example, $ 'VARIABLE{value}'. The 'VARIABLE{value}' string may not contain quotes (' or ").
{X} expands to the value of the configuration variable {X} - for example, {ScriptUrlPath}
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  1. TWiki variable defined or not
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WIKINAME is defined
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WIKINAME is defined
 

2. Compare TWiki variable

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You are not allowed to
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You are not allowed to
 edit this TWiki today.

3. URL parameter

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No search passed in
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No search passed in
 

4. Range test on URL parameter

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 Context identifiers are used in TWiki to label various stages of the rendering process. They are especially useful for skin authors to find out where they are in the rendering process. The following context identifiers are available:
id context
absolute_urls Set if absolute URLs are required
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attach in attach script (see TWikiScripts)
 
authenticated a user is authenticated
body_text when the body text is being processed in a view (useful in plugin handlers)
can_login current environment supports login
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header_text when the header text is being processed in a view (useful in plugin handlers)
i18n_enabled when user interface I18N support is enabled (i.e., user can choose the language for UI)
inactive if active links such as 'edit' and 'attach' should be disabled
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login & logon in login / logon script (see TWikiScripts)
manage in manage script (see TWikiScripts)
 
mirror if this is a mirror
new_topic if the topic doesn't already exist
oops in oops script (see TWikiScripts)
preview in preview script (see TWikiScripts)
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register in register script (see TWikiScripts)
rename in rename script (see TWikiScripts)
resetpasswd in resetpasswd script (see TWikiScripts)
 
rss if this is an RSS skin rendering
save in save script (see TWikiScripts)
search in search script (see TWikiScripts)
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statistics in statistics script (see TWikiScripts)
 
textareas_hijacked provided for use by editors that highjack textareas, and want to signal this fact. This is used by skins, for example, so they can suppress extra controls when textareas have been hijacked.
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upload in upload script (see TWikiScripts)
 
view in view script (see TWikiScripts)
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viewfile in viewfile script (see TWikiScripts)
 
rest in rest script (see TWikiScripts)
registration_supported registration is supported by the current UserMapper
registration_enabled set if {Register}{EnableNewUserRegistration} is on, and registrationis supported
 
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