Re: [ShowIf] if the varieable exists
This WebDNA talk-list message is from 1998
It keeps the original formatting.
numero = 20305
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 in WebCatalog 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] tags returns it untouched, so then you are checking on the right side of the equation to see if the left side returned an actual value, or wasn't found to be a variable and just returned the name of the variable back in brackets. Likewise, if you want to do somethign when the variable doesn't exist: [showif [wogroup1datarq]=[raw][wogroup1datarq][/raw]]Howard Wolosky ============Lead Programmer / Webmaster www.willitwork.com Will 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 in WebCatalog 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] tags returns it untouched, so then you are checking on the right side of the equation to see if the left side returned an actual value, or wasn't found to be a variable and just returned the name of the variable back in brackets. Likewise, if you want to do somethign when the variable doesn't exist: [showif [wogroup1datarq]=
[raw][wogroup1datarq][/raw]]Howard Wolosky ============Lead Programmer / Webmaster www.willitwork.com Will It Work presented by Lab 2k -The World's Largest Year 2000 Compliance Seach Engine
Howard Wolosky
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