RE: UDF Vs Custom Tags?
No! UDF's allow you to create a function, where a customtag is more like the name suggests. So you can do something like what is below in a UDF:- cfset test = CustomFunction(var1,var2,var..) Regards, Andrew Scott -Original Message- From: Will Ryan [mailto:[EMAIL PROTECTED]] Sent: Friday, 14 September 2001 12:15 AM To: CF-Talk Subject: UDF Vs Custom Tags? Hello All, I need some clarification, what is the difference between a UDF a Custom Tag? Are they stored called the same way? -TIA Will ~~ Structure your ColdFusion code with Fusebox. Get the official book at http://www.fusionauthority.com/bkinfo.cfm FAQ: http://www.thenetprofits.co.uk/coldfusion/faq Archives: http://www.mail-archive.com/cf-talk@houseoffusion.com/ Unsubscribe: http://www.houseoffusion.com/index.cfm?sidebar=lists
RE: UDF Vs Custom Tags?
I need some clarification, what is the difference between a UDF a Custom Tag? Are they stored called the same way? Big question. Your best bet is to read the CF docs, or any of the new CF5 books, but, as a general overview: Custom tags are called via CF_Foo, where Foo is the name of the custom tag, or CFMODULE. Custom tags are written in normal CFML, and are stored in either the same directory or in the custom tags directory. CTs (custom tags) provide a black box type protection for your code. This means code inside the CT is safe from overwriting code in the calling template. So, if your file, index.cfm, had set X to 1, and CT sets X to 2, it will NOT change the value of X in the calling template. Of course, CTs provide ways of returning values. UDFs are written in CFSCRIPT only. UDFs must either be declared on the page, or in an cfincluded page. UDFs have access to the page's local variables, so extra steps must be taken to not 'step' on them. UDFs are a bit easier to call as well. For example, imagine a CT and a UDF that return if an email is valid or not: CF_IsEmail Email=ray@yourmother r_isEmail=ValidEmail CFIF ValidEmail . /CFIF Compared to: CFIF IsEmail(ray@yourmothter) ... /CFIF Obviously the UDF is _much_ cleaner. I'm going to stop writing now, because if I don't, I'll have a mini book here. Again, check the docs. Also, you can check out www.cflib.org for a set of free UDFs. You can examine them and learn from them. === Raymond Camden, Principal Spectra Compliance Engineer for Macromedia Email: [EMAIL PROTECTED] Yahoo IM : morpheus My ally is the Force, and a powerful ally it is. - Yoda ~~ Get the mailserver that powers this list at http://www.coolfusion.com FAQ: http://www.thenetprofits.co.uk/coldfusion/faq Archives: http://www.mail-archive.com/cf-talk@houseoffusion.com/ Unsubscribe: http://www.houseoffusion.com/index.cfm?sidebar=lists
RE: UDF Vs Custom Tags?
I need some clarification, what is the difference between a UDF a Custom Tag? Are they stored called the same way? I'd usualy just tell someone to RTFM, but I'm bored today. A custom tag is called like: cf_mytag wibble=rar rar=wibble kdsgsdgsdg sdg sgd sdg /cf_mytag A UDF is used like: cfquery name=qQuery datasource=#myUDF(session.username)# select ... /cfquery or inside a cfscript block, just like any other CF function. Custom tags have to reside in a seperate file, UDF's may be declared inline ~~ Your ad could be here. Monies from ads go to support these lists and provide more resources for the community. http://www.fusionauthority.com/ads.cfm FAQ: http://www.thenetprofits.co.uk/coldfusion/faq Archives: http://www.mail-archive.com/cf-talk@houseoffusion.com/ Unsubscribe: http://www.houseoffusion.com/index.cfm?sidebar=lists
Re: UDF Vs Custom Tags?
Well actually they are very diffenent but yet the same... A UDF is a function Use a cfscript block to define a User Defined Function in a C++/Java style function which is used as a #UserDefinedFunction()# A Custom Tag is a mini applicaion... Creating a new CFM that is completely self reliant with all info being passed to it cf_UserCustomTag With=Variables Passed=Using These=Methods If you research it a little youll find the details on the benifits and drawbacks of each Hope this help... Trishan Singh ACP/CCFD [EMAIL PROTECTED] 316-204-1097 Paracom Technologies Wichita KS - Original Message - From: Will Ryan [EMAIL PROTECTED] To: CF-Talk [EMAIL PROTECTED] Sent: Thursday, September 13, 2001 9:14 AM Subject: UDF Vs Custom Tags? Hello All, I need some clarification, what is the difference between a UDF a Custom Tag? Are they stored called the same way? -TIA Will ~~ Structure your ColdFusion code with Fusebox. Get the official book at http://www.fusionauthority.com/bkinfo.cfm FAQ: http://www.thenetprofits.co.uk/coldfusion/faq Archives: http://www.mail-archive.com/cf-talk@houseoffusion.com/ Unsubscribe: http://www.houseoffusion.com/index.cfm?sidebar=lists
RE: UDF Vs Custom Tags?
I need some clarification, what is the difference between a
UDF a Custom Tag? Are they stored called the same way?
A User-defined function (UDF) is a code module written in CFSCRIPT in (or
included into) your ColdFusion program file - you might hear UDFs referred
to as inline functions. Within the CFSCRIPT tag block, UDFs are written
using the function syntax found in JavaScript:
cfscript
function myfunction(foo, bar) {
return foo * bar;
}
/cfscript
User-defined functions share the same scopes as the page within which
they're contained, although you can use the var keyword to declare variables
local to that function. They're called as you'd call any built-in CF
function:
cfset mynum = myfunction(5, 3)
User-defined functions were introduced with CF 5.
Custom tags, on the other hand, are separate ColdFusion program files, which
are called from other ColdFusion program files. They have their own scopes,
and are called as any other CF tags would be called. They can be stored in
many places, and called using CF_TAGNAME syntax, or using the CFMODULE tag.
Custom tags are significantly more powerful, but have greater overhead
(which shouldn't be surprising since they're really separate programs).
Dave Watts, CTO, Fig Leaf Software
http://www.figleaf.com/
voice: (202) 797-5496
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Re: UDF Vs Custom Tags?
Hello Will, 0.02 Custom tags are called in their own memory space, so their execution is not quite as fast as udf's (I believe) -- Critter, MMCP Certified ColdFusion Developer Crit[s2k] - CF_ChannelOP Network=Efnet Channel=ColdFusion --- Thursday, September 13, 2001, 10:14:43 AM, you wrote: WR Hello All, WR I need some clarification, what is the difference between a UDF a Custom WR Tag? Are they stored called the same way? WR -TIA WR Will WR ~~ Your ad could be here. Monies from ads go to support these lists and provide more resources for the community. http://www.fusionauthority.com/ads.cfm FAQ: http://www.thenetprofits.co.uk/coldfusion/faq Archives: http://www.mail-archive.com/cf-talk@houseoffusion.com/ Unsubscribe: http://www.houseoffusion.com/index.cfm?sidebar=lists
