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Explanation of Combining the ColdFusion Form and Action Pages. Also refer to Allaire, database, client, server, ODBC, functions, if, then, else, School for Champions. Copyright © Restrictions
Combining the ColdFusion Form and Action Pages
by Ron Kurtus (revised 3 July 2001)
The common way to submit forms in ColdFusion is to use a Form page and an Action page. By using some clever programming, you can combine those two pages into one.
Questions you may have include:
- What is the two page method?
- How do you combine pages?
- What actually happens when you do this?
This lesson will answer those questions. There is a mini-quiz near the end of the lesson.
Two page method
The common way to submit forms in ColdFusion is to use two pages. First, you have a Form Page, where the user can input information and click a Submit button. The information is then sent to an Action Page, where the material sent from the form can be used to query a database for more information, to insert new information into the database, or perform other tasks.
Combining pages
A clever way to perform both tasks on one page is to use a <CFIF> tag along with the IsDefined function to display what would be on the second page, provided the form has been submitted. The coding would be as follows:
<BODY>
<CFIF IsDefined("form.submit")> (Note that you could use "form.variable", for any variable
sent in your submission.)
(Place material that would be in the Action Page here.)
<CFELSE>
(Place Form Page material here. The name for the Submit button is NAME="submit".)
</CFIF>
What happens
When you first open the page, <CFIF IsDefined("form.submit")> does not apply, so the material after <CFELSE> displays.
After filling in the form and clicking the Submit button, the page refreshes and the <CFIF IsDefined("form.submit")> section is activated, while the <CFELSE> section is hidden.
The IsDefined function checks if the "submit" variable (or other defined variable) has been sent from the form. If it has, then the Action Page material can be displayed and action taken.
Summary
This method can reduce the number of pages you have in an application and can make debugging the code easy to do.
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Resources
The following resources provide information on this subject.
Websites
Books
Mini-quiz to check your understanding
If you got all three correct, you are on your way to becoming a Champion in ColdFusion Development. If you had problems, you had better look over the material again.
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Also see Answers to Readers' Questions.
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Combining the ColdFusion Form and Action Pages