multiple checkbox

**bishwadeep** · Dec 11 '06, 09:44 AM

Please see the following example. Hope it will help you

Code:

<body>
<form action="checkbox.php" method="post">
  <input type="checkbox" name="checkbox" value="a">
  <input type="checkbox" name="checkbox" value="b">
  <input type="checkbox" name="checkbox" value="c">
  <input type="checkbox" name="checkbox" value="d">
  <br>
  <br>
  <input type="submit" name="Submit" value="Submit">
</form>
<?
	if(isset($_POST['Submit']))
	{
		echo $_POST['checkbox'];
	}
?>
</body>

**mudgilgaurav** · Dec 11 '06, 12:50 PM

Originally posted by bishwadeep

Please see the following example. Hope it will help you

Code:

<body>
<form action="checkbox.php" method="post">
  <input type="checkbox" name="checkbox" value="a">
  <input type="checkbox" name="checkbox" value="b">
  <input type="checkbox" name="checkbox" value="c">
  <input type="checkbox" name="checkbox" value="d">
  <br>
  <br>
  <input type="submit" name="Submit" value="Submit">
</form>
<?
	if(isset($_POST['Submit']))
	{
		echo $_POST['checkbox'];
	}
?>
</body>

HI

Thnx for ur response
this thing know already i asked if i select 3 checkboxes on the first page then how to access all those three selected check boxes the method u gave print only the last selected box

if u know then plz reply

bye

**ronverdonk** · Dec 11 '06, 04:02 PM

Originally posted by mudgilgaurav

HI

Thnx for ur response
this thing know already i asked if i select 3 checkboxes on the first page then how to access all those three selected check boxes the method u gave print only the last selected box

if u know then plz reply

bye

This sample is incorrect! It treats the checkboxes like radio buttons because you give them all an identical name. And only one of the names can be set that way. When you want to get all the values that have been checked, you make the name field an array. So when you click checkboxes 1 and 3 (values 'a' and 'c'), you have an array that, when printed using print_r looks like:

Code:

Array ( 
       [0] => a 
       [1] => c 
      )

So in your catching script you must process the array with name $_POST['checkbox']
Here is the code:
[php]<body>
<form action="checkbo x.php" method="post">
<input type="checkbox" name="checkbox[]" value="a">
<input type="checkbox" name="checkbox[]" value="b">
<input type="checkbox" name="checkbox[]" value="c">
<input type="checkbox" name="checkbox[]" value="d">
<br>
<br>
<input type="submit" name="Submit" value="Submit">
</form>
<?

/* and in your checkbox.php you do this: */

if(isset($_POST['Submit']))
{
for ($i=0; $i<count($_POST['checkbox']);$i++) {
echo "<br />value $i = ".$_POST['checkbox'][$i];
}
}
?>
</body>
[/php]
When you select boxes 2 and 4, the result of this script is then

Code:

value 0 = b
value 1 = d

Ronald :cool:

**crisis123** · Jun 18 '09, 07:11 AM

hi i have multiple checkboxes on my page and i wanna select only one at a time...i dont want to use radio buttons.

can anyone provide some help??

thanku

**Dormilich** · Jun 18 '09, 08:05 AM

but radio button would be best suited for that (i.e. they allow only one to be checked in a group)

anything beyond that requires JavaScript. (you can make it, so that you can select only one checkbox, but if the user disables JavaScript…)

**crisis123** · Jun 18 '09, 08:33 AM

thanks a lot
well i had been askd to use the checkbox by the end user..thats why i had this problem.

another problem is that i have used <input type="checkbox" name="yes[]" value="Y"/> for creating the checkbox
but when i create a variable $checkbox=$_POS T['yes'] in my php script i get an error of undefined index
i have used post method to create the form

any suggestions?

**crisis123** · Jun 18 '09, 08:34 AM

sorry i have used $checkbox=$_POS T['yes[]'] nd still encountered that undefined index error

**Dormilich** · Jun 18 '09, 09:05 AM

unchecked boxes (and radiobuttons) do not appear in $_POST.

do

Code:

var_dump($_POST);

to see what's present in the posted data.

you can also use isset() to check, if the variable/element exists.

**crisis123** · Jun 18 '09, 09:07 AM

thanks a lot
i didnt know about the fact nd wasnt getting any info regarding it

**Dormilich** · Jun 18 '09, 09:17 AM

you may also experiment with the filter functions like filter_has_var( ).

**crisis123** · Jun 18 '09, 09:45 AM

can i use $_POST for upload section?

i didnt get any error on using it but is there a better way?

**Dormilich** · Jun 18 '09, 10:05 AM

Originally posted by crisis123

can i use $_POST for upload section?

do you mean file upload? no, you need to use $_FILES for that.

**crisis123** · Jun 18 '09, 10:08 AM

thanks a lot
i have just started working on php
this is my 1st assignment

**Dormilich** · Jun 18 '09, 10:09 AM

a very valuable resource

multiple checkbox

multiple checkbox

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