MACROMEDIA COLDFUSION MX 61-CFML Informações Técnicas descarregar pdf (Página 111)

Exercise 4: Providing server-side validation 111

Evaluating check box and radio button variables

Business rule 8 in the Compass Travel new trip policy requires you to test the value of the

depositRequired check box form variable. Check box and radio button variables are only passed

to the action page when the user selects these options on the form. An error occurs if the action

page tries to use a variable that was not passed.

To ensure that an error does not occur, you use the

IsDefined function in a cfif statement to

determine whether the user selected the Deposit Required check box on the form.

The

cfif statement and the IsDefined function evaluate the value of the form variable

depositRequired to determine if a value exists. The statement not IsDefined returns True if

the specified variable is not found, and the

cfset statement sets the form variable to No. A value

of No indicates that a deposit is not required; a value of Yes indicates that a deposit is required.

To set the value of the Deposit Required check box:

Open the tripeditaction.cfm file.

Enter the following code after the first cfif code block.

</cfif>

Save the file.

Adding validation for all Compass Travel business rules

You add validation for all the form variables.

To validate all the data passed:

Open the tripeditaction.cfm file in the my_app directory.

Enter the validation code blocks in the following table after the cfif code blocks that you

already entered.

Save the file.

The following table lists the Compass Travel business rules and shows the corresponding code

that ensures that the data entered in the form follows the business rules.

1 2 ... 106 107 108 109 110 111 112 113 114 115 116 ... 151 152

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MACROMEDIA COLDFUSION MX 61-CFML Informações Técnicas Página 111