用html提交表格

Question

I want to submit a form with two components: two dropdown lists. Only the first form 'School' and the submit button itself are submitted. The second form 'pool' is gone somehow.

<form method='get'>
    <select name='School'>
        <option>School Name</option>
        <?php while ($row = sqlsrv_fetch_object($result)){?>
        <option value= "<?php echo $row->ClientID ?>" > <?php echo $row->ClientName; ?></option>
        <?php } ?>
    </select>

    <div id='result'>
    <select name='pool1[]' id="pool" multiple="multiple">        
        <option value='de'>de</option>
    </select>
    <input type="button" value="Delete" name="submit2" onclick="removeOption();"/>
    </div>                      

    <div id="teacherdiv">
    <select name="Teacher[]">
        <option>Select Teacher First</option>            
    </select>                    
    </div>
    <input type="submit" value="Add" name="submit"/>                        

    </form>

This is the URL that I got after I pressed the submit button:

SchoolName.php?School=7&Teacher%5B%5D=Select+Teacher+First&submit=Add

The pool1 dropdown list is not in there.

Answer 1

Have the first option selected by default to ensure a value is passed.

Otherwise it will not even pass an empty value.

    <select name='pool1[]' id="pool" multiple="multiple">        
        <option value='de' selected="selected">de</option>
    </select>