Re: [ShowIf] if the varieable exists
This WebDNA talk-list message is from 1998
It keeps the original formatting.
numero = 20290
interpreted = N
texte = >I understand that normally you would put the [ShowIf] context followed>by the equation.>ex: [ShowIf [wogroup1datarq]=Mustang]Car[/ShowIf]>However, there will not always be an existing variable called>[wogroup1datarq]. Instead, I would like to [ShowIf] if the variable>[wogroup1datarq] exists. How can I do this? [showif [wogroup1datarq]![raw][wogroup1datarq][/raw]]This will showif the variable exists. If you reference a variable inWebCatalog that does not exist, then you just get it right backatcha. i.e. If you say [bob] but there is no variable bob, then it will just return[bob]. Surrounding a variable declaration (i.e. [bob] ) in [raw] tagsreturns it untouched, so then you are checking on the right side of theequation to see if the left side returned an actual value, or wasn't foundto be a variable and just returned the name of the variable back inbrackets. Likewise, if you want to do somethign when the variable doesn'texist: [showif [wogroup1datarq]=[raw][wogroup1datarq][/raw]]Howard Wolosky============Lead Programmer / Webmaster www.willitwork.comWill It Work presented by Lab 2k -The World's Largest Year 2000 Compliance Seach Engine
Associated Messages, from the most recent to the oldest:
>I understand that normally you would put the
[showif] context followed>by the equation.>ex: [ShowIf [wogroup1datarq]=Mustang]Car[/ShowIf]>However, there will not always be an existing variable called>[wogroup1datarq]. Instead, I would like to
[showif] if the variable>[wogroup1datarq] exists. How can I do this? [showif [wogroup1datarq]!
[raw][wogroup1datarq][/raw]]This will showif the variable exists. If you reference a variable inWebCatalog that does not exist, then you just get it right backatcha. i.e. If you say [bob] but there is no variable bob, then it will just return[bob]. Surrounding a variable declaration (i.e. [bob] ) in
[raw] tagsreturns it untouched, so then you are checking on the right side of theequation to see if the left side returned an actual value, or wasn't foundto be a variable and just returned the name of the variable back inbrackets. Likewise, if you want to do somethign when the variable doesn'texist: [showif [wogroup1datarq]=
[raw][wogroup1datarq][/raw]]Howard Wolosky============Lead Programmer / Webmaster www.willitwork.comWill It Work presented by Lab 2k -The World's Largest Year 2000 Compliance Seach Engine
Howard Wolosky
DOWNLOAD WEBDNA NOW!
Top Articles:
Talk List
The WebDNA community talk-list is the best place to get some help: several hundred extremely proficient programmers with an excellent knowledge of WebDNA and an excellent spirit will deliver all the tips and tricks you can imagine...
Related Readings:
Re:listfiles-looking for slick solution (1997)
forms and variables (1998)
Rhapsody? (1997)
Expected behavior? (1998)
[shell] (2002)
Sorting a [listfiles] (2003)
emailer w/F2 (1997)
can WC render sites out? (1997)
This list needs a digest: rant, rave... (1997)
Displaying photo attached to first record (1997)
Problem with summary on date / inconsequent webcat behaviour (1998)
Couple of questions (1999)
Imagemagick and fonts (2004)
More on IE5 (2000)
Not really WebCat (1997)
WebCatalog dying in NT (1998)
Displaying text and populating form fields (again) (2005)
stumped [OT] (2001)
Search inside Include (1998)
PSC recommends what date format yr 2000??? (1997)