MACROMEDIA COLDFUSION MX 61-CFML Informations techniques télécharger pdf (Page 28)

28 Chapter 2: CFML Basics

Using the cfelseif tag to evaluate multiple expressions

To evaluate multiple expressions in a

cfif statement, you can use cfelseif and cfelse tags in

your statement; for example:

HTML and CFML tags executed if expression 1 is True.

HTML and CFML tags executed if expression 2 is True.

HTML and CFML tags executed for expression(s) that is False.

</cfif>

The following example shows you how you can evaluate multiple expressions using these tags.

This example uses a form in which users can enter their state to determine their state tax:

#form.state# State Tax: 8.5%

#form.state# State Tax: 8.2%

#form.state# State Tax Unknown

</cfif>

</cfoutput>

The output of this cfif statement is based on the value entered by the user. If the user enters MA

in the state form field, the state tax results returned is 8.5%. If the user enters VA in the state form

field, the state tax results returned is 8.2%. If the user enters any other state in the state form field,

State Tax Unknown is returned.

Processing form data

Virtually all web applications that gather and write information to a database use a form to

accomplish that task. Forms let you collect information from a user (using an order form,

registration form, and so on) and write that information to a database. Like HTML, there are two

independent steps for creating a form in ColdFusion:

Creating the layout for the form itself.

Writing the code to process the submitted information.

Every form that you create in ColdFusion consist of two parts: the form page and the action page.

These two pages work together to process user input. The form page contains the user interface

elements, such as input fields and radio buttons. The action page handles the processing of the

form page data.

1 2 ... 23 24 25 26 27 28 29 30 31 32 33 ... 151 152

Pas de commentaire

MACROMEDIA COLDFUSION MX 61-CFML Informations techniques Page 28