MACROMEDIA COLDFUSION 5 - INSTALING AND CONFIGURING SERVER Manuale delle Istruzioni Scaricare il pdf (Pagina 115)

Developing code to validate data and enforce business rules 105

The cfset tag lets you manipulate the value of a variable. For example, the following

pseudocode initializes a variable to a specific value and checks the value using the

cfif

statement:

if rule 1 fails then

<cfset isOK = "No"

...

if Rule n fails then

...

update the database

</cfif>

In the previous example, cfset initializes the local variable isOk to Yes. If any rule fails,

the variable

isOK is set to No. The code then tests if isOk equals Yes, before executing the

SQL insert logic.

For more information about using the

cfset and cfif tags and the IsDefined

function, see Developing ColdFusion MX Applications with CFML or the CFML Reference.

Exercise: create an action page with server-side validation

In this exercise you build an action page (tripeditaction.cfm)to validate the data passed to

the ColdFusion Server from the tripedit.cfm data entry page. You use the

cfif and

fset tags to build edits that ensure the data passed is valid per the Compass Travel

business rules. Additionally, you will use the ColdFusion

IsDefined function to check to

see if data was entered in the data entry form (tripedit.cfm).

To build trip edit action page and validate data passed:

1 Open an editor and create a new page called tripeditaction.cfm in the my_app

directory. The new page appears as follows:

<html>

<head>

<title>Untitled</title>

</head>

<body>

</body>

</html>

2 To ensure that Compass Travel business rule 7 is met, insert the following code above

the

<html> tag on the tripeditaction.cfm page. For your convenience, business rule 7

is repeated.

Business rule 7: The trip’s price and base cost are required. Both values are positive

numeric values. The trip price must have at least a 20% markup over base cost.

<cfoutput>Base cost must be a number and cannot be blank.</cfoutput>

1 2 ... 110 111 112 113 114 115 116 117 118 119 120 ... 153 154

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MACROMEDIA COLDFUSION 5 - INSTALING AND CONFIGURING SERVER Manuale delle Istruzioni Pagina 115

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