Question

How do i test for existence of a form field?

Asked by: iamari

on this page, i want to set a variable depending on the existence of a form field, coming from a different page. how do i test if the form field exists?

something like

if (defined('form.accept')) {
   $accept = 1;
} else {$accept = 0;}

This Question has been solved and asker verified All Experts Exchange premium technology solutions are available to subscription members.

Subscribe now for full access to Experts Exchange and get

Instant Access to this Solution

  • Plus...
  • 30 Day FREE access, no risk, no obligation
  • Collaborate with the world's top tech experts
  • Unlimited access to our exclusive solution database
  • Never be left without tech help again

Subscribe Now

Asked On
2005-07-10 at 08:45:00ID21486347
Tags

existence

,

test

,

field

,

form

Topic

PHP Scripting Language

Participating Experts
3
Points
50
Comments
9

Trusted by hundreds of thousands everyday for fast, accurate and reliable tech support.

  • "The time we save is the biggest benefit of Experts Exchange to Warner Bros. What could take multiple guys 2 hours or more each to find is accessed in around 15 minutes on Experts Exchange." Mike Kapnisakis, Warner Bros.
  • "Our team likes having a resource that is more secure than just using Google and most experts using this service really know their stuff. It's nice to look here first versus using Google." Dayna Sellner, Lockheed Martin
  • "Anytime that I've been stumped with a problem, 9 out of 10 times Experts Exchange has either the accepted solution or an open discussion of the potential solution to the problem." Kenny Red, eBay Inc.

See what Experts Exchange can do for you.

Got a question?

We've got the answer.

Experts Exchange has been collecting answers to technology questions since 1996…3 million and counting! If you have a question, chances are we already have your answer.

Screenshot of Experts Exchange Knowledgebase

Need individual assistance?

Our experts are ready to help.

If you can't find the exact answer you're looking for, ask our exclusive community of 50,000 experts. You’ll get a personalized answer from a trusted professional.

Screenshot of Experts Exchange Knowledgebase

Want to learn from the best?

Read articles from industry experts.

Thousands of free tech tips, tricks, how-to’s and tutorials are available in our peer reviewed articles section. See for yourself how smart our experts are, no login required.

Screenshot of an Article

Working on a long term project?

Store your work and research.

Save solutions to your questions, answers you’ve discovered through searching plus helpful articles in your personal knowledgebase for easy future access.

Screenshot of Experts Exchange Knowledgebase

Access the answers to your technology questions today.

Subscribe Now

30-day free trial. Register in 60 seconds.

What Makes Experts Exchange Unique?

Members of the expert community talk about why the experience at Experts Exchange is different than what you will find anywhere else.

Trusted by the world's most respected brands.

image of each brand's logo

Faithfully serving IT professionals since 1996.

Experts Exchange Logo

Try it out and discover for yourself.

Subscribe Now

30-day free trial. Register in 60 seconds.

Related Solutions

  1. removing unused user-defined fields and forms
    I run Outlook 2002. Back when I had 2000, I tried a utility called Scount by Ants.com. It created a special contact form with an extra tab, as well as four or five user-defined fields in my contacts folder. I uninstalled it long ago, but the old contacts still get a blank ta...
  2. Determine existing form fields?
    I've created a handy include template, PreserveForm.inc, that I use to generate hidden input fields populated the FORM object. I use it to perpetually post form data to the next template, and the next, and so on, until I'm ready to update the database. However, it doesn't w...
  3. Checking for existence of a FORM field using Javascript
    Hi, I need to validate contents of some FORM fields in a loop using Javascript. The field names are in a alphanumeric sequence, and so I am using a loop for the same. In case some field names which come in the middle do not exist in the FORM, how can I check if they exist o...

Free Tech Articles

  1. WARNING: 5 Reasons why you should NEVER fix a computer for free.
    It is in our nature to love the puzzle. We are obsessed. The lot of us. We love puzzles. We love the challenge. We thrive on finding the answer. We hate disarray. It bothers us deep in our soul. W...
  2. SCCM OSD Basic troubleshooting
    SCCM 2007 OSD is a fantastic way to deploy operating systems, however, like most things SCCM issues can sometimes be difficult to resolve due to the sheer volume of logs to sift through and the dispe...
  3. Migrate Small Business Server 2003 to Exchange 2010 and Windows 2008 R2
    This guide is intended to provide step by step instructions on how to migrate from Small Business Server 2003 to Windows 2008 R2 with Exchange 2010. For this migration to work you will need the fo...
  4. Create a Win7 Gadget
    This article shows you how to create a simple "Gadget" -- a sort of mini-application supported by Windows 7 and Vista. Gadgets can be dropped anywhere on the desktop to provide instant information, ...
  5. Outlook continually prompting for username and password
    There have been a lot of questions recently regarding Outlook prompting for a username and password whilst using Exchange 2007. There are a few reasons why this would happen and I will try to cover t...
  6. Backup Exchange 2010 Information Store using Windows Backup
    There seems to be quite a lot of confusion around the ability to backup Exchange 2010 using the built in Windows Backup feature. This stems from the omission of this feature prior to Exchange 2007 s...

Cloud Class Webinars

  1. Avoiding Bugs in Microsoft Access
    Alison Balter takes and in-depth look at avoiding bugs in Access. In this webinar you will learn about using the immediate window to debug your applications, invoking the debugger, using breakpoints to troubleshoot, stepping through code, setting the next statement to execute, ...
  2. Top 10 Best New Features in Visio 2010
    Scott Helmers gives live demonstrations of the top 10 new features in Visio 2010. This webinar will teach you how to create compelling diagrams by adding shapes to the page with a single click, linking the shapes in a diagram to data in Excel (or SQL Server, or SharePoint), ...
  3. IT Consultant Business Secrets Revealed
    Michael Munger, Experts Exchange tech pro and IT consultant, pulls back the curtain on his very successful businesses and answers question on every IT consultant and business owner should know about. He shares secrets on what he did to solve the 5 most common problems in IT, ...
  4. Disaster Recovery and Business Continuity
    Quest CTO, Mike Billon, gives an overview of the steps involved in building a dunamic disaster recovery plan. Through case studies and an examination of software/hardware tooles for monitoring and testing, you'll gain a better understandin of where you are, where you want ...
  5. Organize Your Visio Diagrams with Containers and Lists
    Scott Helmers uses cross functional flowcharts, wireframe diagrams, data graphic legends and seating charts to teach you: how to ustilize all three new structured diagram components in Visio 2010, the best practices for organizeing shapes in previous version of Visio, how to organize ...
  6. How to Us Objects, Properties, Events and Methods in Microsoft Access
    Alison Dalter gives an in-depbth look at objects, properties, events and methods in Microsoft Access. In this webinar you will learn about using the object browser, referring to objects, working with properties and methods, working with object variables, understanding the ...

Join the Community

Give a Little. Get a Lot.

Join the community of experts here and help other tech pros by answering question in your area of expertise. You can earn FREE access to all Experts Exchange's premium features and resources.

Join the Community

Answers

 

by: iamanindianPosted on 2005-07-10 at 08:59:27ID: 14407133

It goes like this:
(assuming the form is POST-ed with a form field named "accept")
-----------------------------------------------------------------
if(isset($_POST['accept'])){

}
-----------------------------------------------------------------

WC

 

by: ljubiccicaPosted on 2005-07-10 at 13:50:37ID: 14408122

I do it like this:

(name of this page - form.php)


<?php
if ($_POST["CHECKFORM"]==1){
...
...
} else {
?>

<html>
<head>
<title>...</title>
</head>

<body>
<form action="form.php" method="POST">
<input type='text' value....>
<textarea value='somevalue'....>
<INPUT TYPE='HIDDEN' VALUE='1' NAME='CHECKFORM'>
<input type='submit' value...>
</form>

</body>
</html>

<?php
}
?>


so i have the form and the output in the same .php file, ¸first you get the form, when you click on the submit button, you get the output or whatever you like...

if you send the output of your form into some database you should consider using redirection to another/first page, so clicking several times on submit button takes no effect (else you'll get same outputs several times) but that wasn't really your question...

 

by: iamanindianPosted on 2005-07-10 at 21:09:36ID: 14409312

No hard feelings...but carefully follow what Diablo has advised...he mentioned abt "notice code". You will understand the error by ading the following line on top of your code:
-------------------------------------------------
error_reporting(E_ALL);
-------------------------------------------------


Regards
WC

 

by: ljubiccicaPosted on 2005-07-12 at 02:07:23ID: 14419664

OK

No hard feelings... you will probably laugh to death but what exactly is notice code? (as you may have seen my english is not my first language...)

I understand the error thing now

thanx
ljubiccica

 

by: Diablo84Posted on 2005-07-12 at 03:20:50ID: 14420014

:)

"Notice code" simply means, a piece of script that depends on error notices being hidden to (appear to) work correctly. One of the problems with notice code, besides the syntax being erroneous, is it depends on a particular server configuration to work. If a user should change servers in the future... or if another user was to find a snippet of code via searching... then they may find their scripts are producing errors when they did not before. This means they will have to spend unnecessary time trying to fix the problem and may have to come back here to ask another question. If we show users how to do it correctly in the first place we will save everyone time and improve their ability in the process.

Best wishes

Diablo84

 

by: iamariPosted on 2005-07-12 at 06:27:40ID: 14421114

thanks iamanindian, works just as advertised :)

 

by: ljubiccicaPosted on 2005-07-13 at 00:44:27ID: 14428758

thanx Diablo84,

changed my php.ini file so I can see all the errors now...

20120131-EE-VQP-002

3 Ways to Join

30-Day Free Trial

The Experts

98% positive feedback on 31,087 answers since March 2000. angeliii is a Microsoft Most Valuable Professional for his work with MS SQL Server & Develoment.

He has also proven his knowledge of Visual Basic Programming, PHP Scripting and Oracle Databases.

The Experts

97% positive feedback on 10,752 answers since July 2000. lrmoore has more than 18 years experience in the networking industry.

The six-time Mircosoft MVPs specialties include firewalls, virtual private networking, and network management.

Testimonials

"...and excellent source for support... Kind of like having your very own IT dept." Electriciansnet

Testimonials

"I was apprehensive at signing up at first. However... it has already made my life as an IT administrator much easier." JaCrews

Testimonials

"WOW! You guys have great, active, and knowledgeable people on here." moore50

Business Clients

Business Clients

In the Press

"If you’ve got a question... Experts Exchange can supply an answer.”

In the Press

"...an invaluable aid for both IT professionals and those who require tech support."

In the Press

"where IT professionals provide quick answers on just about any topic"

Business Account Plans

Loading Advertisement...