Week 4

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Week 4
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Action Page
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Guidelines for creating form pages
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Creating Action Pages
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Forms

• You create HTML forms by using the ltFormgt tag
• The action attribute specifies the name of the
  script or program the web server should execute
  in response to the forms submission.
• To submit a form to CF, you specify the name of
  the CF template that will process the form.
• The method Attribute specifies how data is sent
  back to the Web server.
• All CF forms must be submitted as type POST
• Listing 12.1
• Page 304

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Text

• The text control is used to capture relatively
  short string input from users.
• It is good for capturing short text information
  such as names, addresses etc.

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Text Box

• First Name
• ltInput TYPE text Name First_Name
  ValuePut Name Here Size20 MaxLength30gt
• This form control will create a text control with
  a visual size of 20 and will accept 30 characters
  of input.
• A variable called Form.Firstname will be passed
  to the action page with a value of put name
  here.

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The conditional logic that we write is called an
expression. What procedures to perform if the
condition is true What procedures to perform if
the condition is NOT true
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The variables do not pass to the action page If
variable exists If variable does not exist we
can
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• ltcfif firstname IS Bengt
• Whether a variable named Firstname contains the
  value of Ben
• ltcfif firstname IS NOT Bengt
• Whether firstname is not Ben.
• NEQ or Not Equal
• ltcfif dayofweek(Now()) is 1gt
• It is the weekend, yeah
• lt/cfifgt
• Other operators are supported too. Page 227.

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Isdefined function takes one argument, a variable
of any type and Returns either Yes or No
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• ltcfoutputgt
• ltCFIF form.state IS MA
• form.state state tax 8.5
• ltCFELSEIF form.state is VAgt
• form.state state tax 8.2
• ltCFELSEgt
• form.state State Tax Unknown
• lt/cfoutputgt

The code in this example checks the state entered
by the user. If the user Enter MA the state
tax is 8.5 the tax is 8.2 if he enters
VA. Any other state returns the value of
Unknown.
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Nesting ltCFIFgt statements

• ltcfif (var.payment_type IS CC)gt
• ltcfif (var.cc_type IS Amex)gt
• Bill to Amex
• ltcfif (var.cc_type IS Visa)gt
• Bill to Visa
• ltcfif (var.cc_type IS Disc)gt
• Bill to Discover
• lt/cfifgt
• ltCFELSEIF (var.payment_type IS PO)gt
• Purchase order payment
• ltCFELSEgt
• Unknown Payment Method
• lt/CFIFgt

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• Every ltCFIFgt must have a matching lt/CFIFgt.
• Every ltCFIFgt can have a single ltCFELSEgt
• Every ltCFIFgt can have an unlimited number of
  ltCFELSEIFgt tags.

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ltCFPARAMgt

• A way to handle the situation of non existing
  form variables is to use the ltCFPARAMgt tag.
• This tag will create variables like ltCFSETgt but
  will first perform a conditional test.
• If the variable does not already exist, ltCFPARAMgt
  WILL CREATE IT and initialize a value.
• If the variable exists, ltCFPARAMgt does nothing.
• Page 254

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ltCFPARAMgt

• ltCFPARAM nameFirstName DefaultBengt

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ltCFABORTgt

• The CFABORT tag stops processing of a page at the
  tag location. ColdFusion simply returns
  everything that was processed before the CFABORT
  tag. CFABORT is often used with conditional logic
  to stop processing a page because of a particular
  condition.
• Syntax
• ltCFABORT SHOWERROR"error_message"gt

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ltselect name"Toppings"gt ltoption
value"pepperoni"gtPepperonilt/optiongt ltoption
value"mushroom"gtMushroomlt/optiongt ltoption
value"cheese"gtExtra Cheeselt/optiongt ltoption
value"anchovy"gtAnchovylt/optiongt lt/selectgt
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Building Dynamic Select Boxes
ltCFQUERY NAME"q_GetTopping" DATASOURCE"FastTrack
_Solution"gt SELECT FROM
Toppings lt/CFQUERYgt
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Building Dynamic Select Boxes
ltselect name"Toppings"gt ltCFOUTPUT
QUERY"q_GetTopping"gt ltoption value"q_GetTopping
.Topping_ID"gt q_GetTopping.Topping_Desclt/option
gt lt/CFOUTPUTgt lt/selectgt