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Conditional tags

24-Jan-11

Sometimes you want info only to be shown dependant on some conditions. In almost all formatting settings, you can use a special shortcode called [eme_if] that allows these kind of decisions:
You can use all placeholders in the if-part, just by prepending them with “ESC”, e.g you could use this for single event formatting:


#j, #M #Y – #H:#i
#_NOTES
[eme_if tag='#ESC_ATT{color}' value='red'] color: #_ATT{color} [/eme_if]
[eme_if tag='#ESC_ATT{price}'] price: #_ATT{price} [/eme_if]
[eme_if tag='#ESC_TOWN'] the town is: #_TOWN [/eme_if]
[eme_if tag="#ESC_ATT{Image URL}"] [/eme_if]
[eme_if tag="#ESCj #ESCM #ESCY" value="#ESC@j #ESC@M #ESC@Y"] The start and end date of this event is the same, so just showing start: #j #M #Y [/eme_if]
[eme_if tag="#ESC_{j M Y}" value="#ESC@_{j M Y}"] The start and end date of this event is the same: #j #M #Y [/eme_if]
[eme_if tag="#ESC_{j M Y}" notvalue="#ESC@_{j M Y}"] This date is only printed if different from start date: #@_{- j M Y} [/eme_if]


The possible conditions you can test for are:

  • Nothing, you then just check that the placeholder/string mentioned in the tag is not empty: [eme_if tag='#ESC_TOWN']
  • is_empty=1 checks that the placeholder/string mentioned in the tag is in fact empty: [eme_if tag='#ESC_TOWN' is_empty=1]
  • value checks if the placeholder/string mentioned in the tag is the same as the one mentioned in value:
    [eme_if tag='#ESC_ATT{color}' value='red'] color: #_ATT{color} [/eme_if]
  • notvalue checks if the placeholder/string mentioned in the tag has a value different than the once mentioned in value
  • lt checks if the numerical value of the placeholder/string mentioned in the tag has a value lower than the once mentioned in lt
  • le checks if the numerical value of the placeholder/string mentioned in the tag has a value lower than or equal to the once mentioned in lt
  • gt checks if the numerical value of the placeholder/string mentioned in the tag has a value bigger than the once mentioned in gt
  • ge checks if the numerical value of the placeholder/string mentioned in the tag has a value bigger than or equal to the once mentioned in gt
  • contains checks if the value of the placeholder/string mentioned in the contains occurs in the once mentioned in tag
  • notcontains checks if the value of the placeholder/string mentioned in the notcontains doesn’t occur in the once mentioned in tag

As extra, next to the regular placeholders you can use, I added some extra shortcodes:

  • #_IS_SINGLE_EVENT (’1′ if you’re viewing a single event details, ’0′ otherwise)
  • #_IS_SINGLE_LOC (’1′ if you’re viewing a single location details, ’0′ otherwise)
  • #_IS_LOGGED_IN (’1′ if user is logged into WP, ’0′ otherwise)
  • #_IS_ADMIN_PAGE (’1′ if on the admin pages, ’0′ otherwise)
  • #_IS_PRIVATE_EVENT (’1′ if the event is a private event, ’0′ otherwise)
  • #_IS_RSVP_ENABLED (’1′ if the event is RSVP-able, ’0′ otherwise)
  • #_IS_SINGLE_DAY (’1′ if you’re viewing a single day, ’0′ otherwise)
  • #_IS_REGISTERED (’1′ if WP user has already registered for the event, ’0′ otherwise)
  • #_IS_MULTIPRICE (’1′ if the event is a multiprice event, ’0′ otherwise)
  • #_IS_MULTISEAT (’1′ if the event is a multiseat event, ’0′ otherwise)
  • #_IS_MULTIDAY (’1′ if the event start date is different from the end date, ’0′ otherwise)
  • #_IS_ALLDAY (’1′ if the event is a all-day event, ’0′ otherwise)
  • #_IS_RSVP_ENDED (’1′if the registration period has passed, ’0′ otherwise)

Example usage:
[eme_if tag='#_IS_LOGGED_IN' value='0'] You are NOT logged in [/eme_if]
[eme_if tag='#_IS_LOGGED_IN' value='1'] You are logged in [/eme_if]
[eme_if tag='#ESC_CATEGORIES' contains='red'] The event is in at least the red category [/eme_if]
[eme_if tag="#ESCj #ESCM #ESCY" value="#ESC@j #ESC@M #ESC@Y"] The start and end date of this event is the same, so just showing start: #j #M #Y [/eme_if]
A variant of the above, using curly brackets:
[eme_if tag="#ESC_{j M Y}" value="#ESC@_{j M Y}"] The start and end date of this event is the same: #{j M Y} [/eme_if]
Print start date, and print end date only if different:
#_{j M Y} [eme_if tag="#ESC_{j M Y}" notvalue="#ESC@_{j M Y}"] #@_{- j M Y} [/eme_if]

Using this conditional tag requires some playing around …
I also added [eme_if2], [eme_if3], [eme_if4], [eme_if5] and [eme_if6], if you want to use more than one level of logic (wordpress doesn’t like a shortcode with the same name enclosed in another one)