I have a Select tag on my php form named my_form.php:

PHP Code:

<FORM NAME="my_form" ACTION="my_dispatcher.php" METHOD="post"> 
<SELECT NAME="frm_available_depts_cbo[]" MULTIPLE='multiple' SIZE="8"> 


my_form.php calls my_dispatcher.php and I'm trying to access the items in the list like this:

PHP Code:

foreach ($frm_available_depts_cbo as $dept_id) 
        { 
          print "$dept_id<br>"; 
        } 


But I'm getting: Warning: Invalid argument supplied for foreach()

I'm submitting my_form.php using javascript's .Submit() in a JS function:

PHP Code:

// JS code 
 function submit_my_form_click() 
{ 
  // do other stuff here before submitting ... 
  document.my_form.submit(); 
} 

<INPUT NAME="btn_click" TYPE="button" VALUE="Update" onClick="submit_myform_click();"> 


So, I can't figure out why I'm getting that warning!

Check the post data.

PHP Code:

print_r($_POST); 


Also, are you setting $frm_available_depts_cbo? If register globals is off (which it should be) you have to set it:

PHP Code:

$frm_available_depts_cbo = $_POST['frm_available_depts_cbo']; 


print_r($_POST);

displays the first value of the Select list.
There are 3 items in the frm_available_depts_cbo[] list var but only the 1st one displays when I do the print_r

var_dump($frm_available_depts_cbo);
displays: string(2) "66"
66 is the value of the first item in the list but there are more items. I don't know what the string(2) means.

It's because name="name[]" does NOT return the items as an array.

Multiple selections are returned as a comma separated string.

I have 4 items in the list and the following only displays one item because the count is only 1, not 4:

PHP Code:

$php_string = explode(",",$frm_available_depts_cbo);
print count($php_string)."<br>";
for ($i = 0; $i < count($php_string); $i++)
    {
      print $php_string[$i]."<br>";
    } 


I discovered the problem is being caused by my JS code just prior to the JS submit. If I remm out the JS code then the frm_available_depts_cbo var works as expected. I was trying to use JS to move selected list items from one list to the other.

PHP Code:

var selectAssignedOptions = document.getElementById('id_assigned_to_emp_depts_cbo').options;
var selectAvailableOptions = document.getElementById('id_available_depts_cbo').options;
var AssignedOption;
var i = 0;
for (i = selectAvailableOptions.length-1; i >= 0; i--)
      {
        if (selectAvailableOptions[i].selected)
           {
             AssignedOption = document.createElement("Option");
             AssignedOption.text = selectAvailableOptions[i].text;
             AssignedOption.value = selectAvailableOptions[i].value;
             selectAssignedOptions.add(AssignedOption);
             selectAvailableOptions.remove(i);
           }
      }
  document.my_form.submit(); 


So, something in my JS is trashing my form's frm_available_depts_cbo var.