Help Needed: Multi SELECT item & Arrays

**krisjohnson** · 08-27-2009, 10:52 PM

I'm trying to take the input from a <SELECT> Form item that has the MULTIPLE option turned on.

Once I can do this properly - I plan to populate that list with databse values - but I need to be able to process the users selections in the resulting page call.

Code:

print("<select name=subcategory[] multiple=multiple >");

I have a simple list of items and I want the user to be able to select more than one item.

I created my FORM variable as an array - so that the $_POST would process this as an array. I know the $_POST item can return an array - but how do you access that information on the other side?

All examples that I seen really do not address how to move the FORM variable back into a PHP array that can be used.

Basic FORM item:

PHP Code:


<?php

[SIZE="2"]

print("<form action=./chk_value.php method=post name=newitem>");

   print("<fieldset>");

    print("<legend class=formTitle> Select A Value </legend>");

    print("<P class=ptight>");

   print("<label for=subcategory>Product Subcategory</label>");

print("<select name=subcategory[] multiple=multiple >");

print("<option value=1>Apple</option>");

print("<option value=2>Apricots</option>");

print("<option value=3>Bananna</option>");

print("<option value=4>Blueberry</option>");

print("<option value=5>Cherry</option>");

print("<option value=6>Cranberry</option>");

print("<option value=7>Figs</option>");

print("<option value=8>Grapes</option>");

print("<option value=9>Oranges</option>");

print("<option value=10>Strawberry</option>");

print("</select>");               

 print("</P>");



    print("<P>");

print("<input name=add_button type=submit value=Save class=formText>");

    print("</P>");

   print("</fieldset>");

 print("</form>");

[/SIZE]

?>

At this point - I'm just trying to see the that the values are in my PHP variable in the page that process it - chk_value.php

Here's all the code in the <BODY> tag (pretty simple at this point):

PHP Code:


<?php

   $subcategory_value = array();



   # Get need key value SUBCATEGORY ID 

   print("The size of the Subcategory array is -> ". sizeof($_POST['subcategory']) . "<BR>" );

  

   for ($i=0;$i<=count($_POST['subcategory']);$i++){  

    $subcategory_value[]  = $_POST['subcategory'];           

   }

   

   

   foreach ($subcategory_value as $key => $value) 

      {   echo $key." - " . $value . "<BR>";              

      }





?>

I suspect that this code

Code:

 $subcategory_value[]  = $_POST['subcategory'];

in the FOR LOOP is causing the problem.

So when "chk_value.php" executes - How do I properly move the FORM variable captured into a PHP array variable that I can use????

**forum_amnesiac** · 08-29-2009, 07:43 AM

In my current painkiller induced haze this is my suggestion.

The [] in the SELECT create an array that is passed as an array to PHP.

Try this

PHP Code:


$subcategory_value=$_POST['subcategory'];



   for ($i=0;$i<=count($subcategory_value);$i++){   

       echo $i." - " . $subcategory_value[i] . "<BR>";                         

   }

I haven't tested it but I think it's on the right track, perhaps somebody with a clearer head might be able to help further

**krisjohnson** · 09-01-2009, 01:28 AM

Fourm_Amnesiac:

I actually came up with a solution too.

This would be for the page that process the multi-select field:

PHP Code:




   $subcategory_value = array();



   # Store values from multi-select field

    if (is_array($_POST) && (count($_POST) > 1) ){

     #

       foreach ($_POST['subcategory'] as $key => $value) 

          {   



            $subcategory_value[] = $value;

            echo $key." - " . $value . "<BR>";              

          }

    # 

   }

   

     # Display values of assigned array

      foreach($subcategory_value as $key => $value) {

      echo $key." - " . $value . "<BR>";              

              }

This was a code sample enroute to a bigger exercise.

I used this sample to help with a page that has a multi-select field.
The data in the field is generated from a database table.

I then used the selected values to perform multiple inserts in the processing page.

Thanks for taking time to answer my question

krj

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