DaniWeb Forum Index > Web Development > PHP

How to process checkboxes in php ?

Please support our PHP advertiser: PostgreSQL or MySQL? Compare and contrast the two most popular open source databases

•

Join Date: Mar 2009

Posts: 211

Reputation: rahul8590 is on a distinguished road

Solved Threads: 11

rahul8590

Offline

Posting Whiz in Training

How to process checkboxes in php ?

Aug 16th, 2009

hello everyone ! ,
I am creating a form with various check boxes in it. The check boxes represent various type of workshop the person wants to attend.

i just dont know how to process the data in check boxes.

check.html
The html code is :

 Help with Code Tags 
 PHP Syntax (Toggle Plain Text) 
<html>
<head>
<title>Untitled Document</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
</head>
 
<body>
<p>Please select the check boxes to for registering for the workshop</p>
<form name="form1" method="post" action="check.php">
  <input type="checkbox" name="cr" value="checkbox">
  Clinical REsearch 
</form>
<form name="form2" method="post" action="check.php">
  <input type="checkbox" name="bt" value="checkbox">
  Biotechnology 
</form>
<form name="form3" method="post" action="check.php">
  <input type="checkbox" name="mc" value="checkbox">
  Medical stuff 
</form>
<form name="form4" method="post" action="check.php">
  <input type="checkbox" name="none" value="checkbox">
  None of them , i was kidding...... heheheheh 
</form>
<form name="form5" method="post" action="check.php">
  <input type="submit" name="Submit" value="Register me now">
</form>
<p>&nbsp; </p>
</body>
</html>
<html>
<head>
<title>Untitled Document</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
</head>

<body>
<p>Please select the check boxes to for registering for the workshop</p>
<form name="form1" method="post" action="check.php">
  <input type="checkbox" name="cr" value="checkbox">
  Clinical REsearch 
</form>
<form name="form2" method="post" action="check.php">
  <input type="checkbox" name="bt" value="checkbox">
  Biotechnology 
</form>
<form name="form3" method="post" action="check.php">
  <input type="checkbox" name="mc" value="checkbox">
  Medical stuff 
</form>
<form name="form4" method="post" action="check.php">
  <input type="checkbox" name="none" value="checkbox">
  None of them , i was kidding...... heheheheh 
</form>
<form name="form5" method="post" action="check.php">
  <input type="submit" name="Submit" value="Register me now">
</form>
<p>&nbsp; </p>
</body>
</html>

the check.php code is :

 Help with Code Tags 
 PHP Syntax (Toggle Plain Text) 
<?php
 
$dbc = mysqli_connect('localhost','root','','aliendb')
       or die('error connecting to MySql');
 
$fin = 'hey';
 
if( (isset($_POST['cr'])) && (isset($_POST['bt'])) && (isset($_POST['mc']))  )
{
	$fin = "clinical research" . '</br>' . "Biotech" . '</br>' . "Medical crap";
}
 
echo 'ur registered no go home ';
 
 
$query = "INSERT INTO checkbox(workshop)".
          "VALUES ('$fin')";
 
$result = mysqli_query($dbc , $query) or die('Error querying db');
 
mysqli_close($dbc);
 
?>
<?php

$dbc = mysqli_connect('localhost','root','','aliendb')
       or die('error connecting to MySql');

$fin = 'hey';

if( (isset($_POST['cr'])) && (isset($_POST['bt'])) && (isset($_POST['mc']))  )
{
	$fin = "clinical research" . '</br>' . "Biotech" . '</br>' . "Medical crap";
}

echo 'ur registered no go home ';


$query = "INSERT INTO checkbox(workshop)".
          "VALUES ('$fin')";

$result = mysqli_query($dbc , $query) or die('Error querying db');

mysqli_close($dbc);

?>

wat i want is when the person clicks on one or more of the boxes , in my database the corresponding data must be entered in workshop coloumn.

example:

if the person clicks on
1.Medical Biotechnolgy
2.CLinical REsearch

Then in the workshop coloumn , these two names must be entered by the query.

I would really appreciate if u guys can help me out.

<?php
$data = $_POST['data'];
if(empty($data)) {
echo "byte me" ; }
?>

•

Join Date: Aug 2005

Posts: 150

Reputation: sDJh is an unknown quantity at this point

Solved Threads: 13

sDJh

Offline

Junior Poster

Re: How to process checkboxes in php ?

Aug 16th, 2009

You just need a single form-element, which goes around all of your checkboxes and a submit-button at the very end. Then the state of the checkboxes are represented in PHP by simply having a variable named after your checkbox set to the text you put in the "value"-element. If the user hasn't clicked the box, the variable keeps empty.
Example:

 Help with Code Tags 
 PHP Syntax (Toggle Plain Text) 
<?
$cr=$_REQUEST["cr"];
$bt=$_REQUEST["bt"];
$cr=="checkbox" if clicked or $cr=="" if not clicked
<?
$cr=$_REQUEST["cr"];
$bt=$_REQUEST["bt"];
$cr=="checkbox" if clicked or $cr=="" if not clicked

http://www.explosive-software.de/?lang=en

•

Join Date: Mar 2009

Posts: 211

Reputation: rahul8590 is on a distinguished road

Solved Threads: 11

rahul8590

Offline

Posting Whiz in Training

Re: How to process checkboxes in php ?

Aug 16th, 2009

SDjh , well i am not quite getting in wat r u trying to tell.
can u quote a simple example on how a single check box is processed , may be i am lacking that part,
so i guess u don't use $_POST in case of check boxes rather u use
$_Request.

Well sorry if this sounds ridiculous , i am a tyro in PhP

<?php
$data = $_POST['data'];
if(empty($data)) {
echo "byte me" ; }
?>

•

Join Date: Aug 2005

Posts: 150

Reputation: sDJh is an unknown quantity at this point

Solved Threads: 13

sDJh

Offline

Junior Poster

Re: How to process checkboxes in php ?

Aug 16th, 2009

The difference between $_POST and $_REQUEST is simply, that $REQUEST handles POST as well as GET variables. So don't mind about this.

Now seeing if the user has selected a checkbox you can simply access the variable in PHP. Example:

 Help with Code Tags 
 PHP Syntax (Toggle Plain Text) 
Your form:
<form method=post action="output.php">
<label><input type=checkbox name="checkbox1" value="helpivebeenclicked">Please click me, I look like a frog, but I'm a princess!</label>
<input type=submit>
</form>
 
Your PHP-Skript "output.php"
<?
$checkbox1=$_REQUEST["checkbox1"];
if($checkbox1=="helpivebeenclicked"){echo "User released the princess!";}
if($checkbox1==""){echo "User denied clicking the frog.";}
?>
 
Your form:
<form method=post action="output.php">
<label><input type=checkbox name="checkbox1" value="helpivebeenclicked">Please click me, I look like a frog, but I'm a princess!</label>
<input type=submit>
</form>

Your PHP-Skript "output.php"
<?
$checkbox1=$_REQUEST["checkbox1"];
if($checkbox1=="helpivebeenclicked"){echo "User released the princess!";}
if($checkbox1==""){echo "User denied clicking the frog.";}
?>

If you now name the checkbox "whatevericanthinkof" the variable in PHP is also called "whatevericanthinkof". I you set the value of the checkbox to "donthaveanyidearightnow" the variable will be set to "danthaveanyidearightnow" and so on.
If the user hasn't clicked the box, the variable is simply an empty string.

http://www.explosive-software.de/?lang=en

•

Join Date: Feb 2009

Posts: 17

Reputation: apease11 is an unknown quantity at this point

Solved Threads: 0

apease11

Offline

Newbie Poster

Re: How to process checkboxes in php ?

Aug 16th, 2009

Just do this, $checkbox1=$_POST["checkbox1"]; (like sDJh said) and then preform:

if ($checkbox1) { ... Your Code ... }

That worked fine for me. It just checks to see if the check box has been changed at all from it's default value of null. I can email you my working script also if you would like.

Last edited by apease11; Aug 16th, 2009 at 6:32 pm.

•

Join Date: Mar 2009

Posts: 211

Reputation: rahul8590 is on a distinguished road

Solved Threads: 11

rahul8590

Offline

Posting Whiz in Training

Re: How to process checkboxes in php ?

Aug 17th, 2009

sDjH .. kudos to you.
But the script is working properly when the check box is checked
but if its not , its giving me a parse error.

Help with Code Tags

PHP Syntax (Toggle Plain Text)

Notice: Undefined index: checkbox1 in C:\wamp\www\db\output.php on line 2
User denied clicking the frog.

i wrote the output.html and output.php separately
When the check box is clicked its fine , when its not its displaying the message as well as the parse error . Is there ne way to remove the error with some text or so for that condition that would be great.

Last edited by rahul8590; Aug 17th, 2009 at 12:59 pm. Reason: spelling mistake

<?php
$data = $_POST['data'];
if(empty($data)) {
echo "byte me" ; }
?>

•

Join Date: Feb 2009

Posts: 17

Reputation: apease11 is an unknown quantity at this point

Solved Threads: 0

apease11

Offline

Newbie Poster

Re: How to process checkboxes in php ?

Aug 17th, 2009

Have you tried:

 Help with Code Tags 
 php Syntax (Toggle Plain Text) 
if($checkbox1=="helpivebeenclicked"){echo "User released the princess!";}
else {echo "User denied clicking the frog.";}
if($checkbox1=="helpivebeenclicked"){echo "User released the princess!";}
else {echo "User denied clicking the frog.";}

•

Join Date: Mar 2009

Posts: 211

Reputation: rahul8590 is on a distinguished road

Solved Threads: 11

rahul8590

Offline

Posting Whiz in Training

Re: How to process checkboxes in php ?

Aug 17th, 2009

sorry , i didnt mention this , but i tried that method also when i was getting parse error.
Well basically the parse error is in line 2
which is :

 Help with Code Tags 
 PHP Syntax (Toggle Plain Text) 
$checkbox1=$_REQUEST["checkbox1"];
$checkbox1=$_REQUEST["checkbox1"];

this Undefined index error as i said before , is generated only on not clicking the check box , but works fine when clicked.

Last edited by rahul8590; Aug 17th, 2009 at 1:11 pm.

<?php
$data = $_POST['data'];
if(empty($data)) {
echo "byte me" ; }
?>

Quick Reply to Thread

Show Printable Version

Similar Threads

using javascript to manipulate checkboxes that use PHP arrays (JavaScript / DHTML / AJAX)
php + mysql for web sms (PHP)
passing checkboxes to php using array in form (PHP)
Identifing all Active sessions in PHP (PHP)
PHP Checkbox (PHP)
Accessing HTML checkboxes with php and javascript (PHP)
testing php (PHP)
Jumping into Php (PHP)

Other Threads in the PHP Forum

Previous Thread: Help with drop down list and keyword search.
Next Thread: mp3 upload from PHP

Thread Tools	Search this Thread
Show Printable Version Email this Page

DaniWeb Message

Cancel Changes