Checkbox processing

mikie46

Im trying to process a form that has a unique name value which is not an array but have been unsuccessful in grabbing the value. When i view the page source i see this;

I have tried many combinations of a loop but the value is always blank. At least when i try to echo or print it too the script is does not return a value so i cant tell if its really working.

I tried something like this.

for($i=0;$i<=$_POST['select'];$i++)
{
    if ( isset($_POST["select$i"] ) ) { 
print $_POST["select$i"]." is checked.<br/>"; 
} 
}

This does not seem to work and im not sure why. I placed some exit statements in the code to see if it drops out of the loop somewhere and found the the statement

 if ( isset($_POST["select$i"] ) ) {

is completely bypassed. I dont understand why. I tried using $_GET as well, Same results. It just cant see the fact that the checkbox has been checked on the form.

NogDog

for($i = 0; $i <= 3; $i++)
{
   if(isset($_POST["select$i"]))
   {
      print $_POST["select$i"]." is checked.<br/>";
   }
}

However, that requires hard-coding the range of numbers. Using array-type names would make things more flexible:

<input type="checkbox" name="select[1]" value="$user">

foreach($_POST['select'] as $key => $value)
{
   print "Select number $key is checked and has a value of '$value'.<br/>\n";
}

mikie46

However, that requires hard-coding the range of numbers. Using array-type names would make things more flexible:

Right, but the problem is, i dont have control of the form. Im simply processing on the results with a value as

select0
select1
select2

etc.

Which i cannot change. Im simply processing the form with those assigned values. But ill give that a try and see if that works.

Thanks

tekky

Worst case...

<?php
$prefix = 'select';
$count = count($_POST);
for($i=0;$i<$count;$i++) {
  $select = $prefix . $i;
  if(isset($_POST[$select])) {
     echo $select . ' is checked and its value is: ' . $_POST[$select];
  }
}
?>

NogDog

Just another thought to play around with:

foreach($_POST as $key => $value)
{
   if(preg_match('/^select\d+$/', $key))
   {
      echo "Checkbox $key is checked and its value is '$value'.<br />\n";
   }
}

mikie46

Ill try the other 2 methods to see if i can get a value from it.

Thanks

DeathfireD

Heres another example that might help you http://www.isk.kth.se/kursinfo/6b4079/forel/form/multi-values.html

mikie46

I couldnt get a value and now i know why.

I need to do some processing after the form has been submitted so the POST is no longer available by the time i try to process on it. That is why if(isset($_POST[$select])) is not set and the condition is always FALSE.

The only thing thats returned to me are select0 though whatever.

So once the form has been submitted, if the user checked select0 and select5 then the values contained within those would need to be processed.

So how would i run a loop to check which select$i was returned then grab the values for those corresponding select$i's?

I would only need to process on the selects that are returned and there could be an unlimited number of them. If the user checked 20 boxes on the page i would need to process on select0....select20. If the user checked only 3 boxes and they were select1 select3 and select5 then i would need to process on those 3 and not select0....select5.

Thanks

tekky

Uhm... this checks ALL posted variables... so it would work... well it checks for selectN...count($_POST)

so if you have 20 posted vars... and only 4 are selectN's... this still checks select0...select19

tekky wrote:

Worst case...

<?php
$prefix = 'select';
$count = count($_POST);
for($i=0;$i<$count;$i++) {
  $select = $prefix . $i;
  if(isset($_POST[$select])) {
     echo $select . ' is checked and its value is: ' . $_POST[$select];
  }
}
?>

mikie46

Yes but as i stated, if(isset($_POST[$select])) does not work for me. No post values can be checked as there is nothing in them. Just select0 though whatever number that is returned.

mikie46

Guys, this is the only solution i found that works.

$user = array("$select0","$select1","$select2");

foreach ($user as $alias) {
   if (isset($alias) && $alias != '') {
        print "User is $alias\n";
    }
 }

The result:

Command Returned:

Details

User is test1 User is test2

But im really limited here because im only checking the result of 3 checked boxes. I would need to modify this somehow to be able to search for unlimited number of checkboxes because if the user was to check off select4.... nothing would be returned and i dont want to manually code select0....select500 manually into an array. Plus it wouldnt be too efficient if the code had to loop 500 times just to find all occurances of selectxx.