php - Hide option in a select box dependant on previous choices. Options generated from SQL -

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i user able select people went hiking with. have used jscript allows user add more selection boxes depending on how many people on hike. names in selection box generated database query.

i put in place stop same person being selected multiple times different selection boxes. example if option 1 in selected in first section box, should not available user in 2nd, 3rd, 4th.....selection box.

the selection boxes generated using following code

<table id="buddytable" class="form" border="1">             <tr>                 <td><input type="checkbox" required="required" name="chk[]" checked="checked" /></td>                 <td><label>buddy</label>                 <select name="buddy[]">                     <option>solo</option>                 <?php              if ($result->num_rows > 0) {                 // output data of each row                 while($row = $result->fetch_assoc()) {                 echo '<option value = "'.$row["idperson"].'">'.$row["forename"]. ' '.$row["surname"].'</option>';                 //echo "name: " .$row["forename"]. " " . $row["surname"]. "<br>";                 }             }              else {                 echo "0 results";             }                            $conn->close();             ?>                 </select>                 </td>             </tr>             </table>

the jscript allow more selection boxes added here

function addrowbuddy(tableid) { var table = document.getelementbyid(tableid); var rowcount = table.rows.length; if(rowcount < 10){                          // limit user creating fields more limits     var row = table.insertrow(rowcount);     var colcount = table.rows[0].cells.length;     for(var i=0; i<colcount; i++) {         var newcell = row.insertcell(i);         newcell.innerhtml = table.rows[0].cells[i].innerhtml;     } }else{      alert("maximum number of buddies 10.");  }

}

i have looked few solutions , although good, none of them inform me on how when mysql/php involved.

any hints, suggestions or guides appreciated.

if don't mind using framework, use w2ui's enum field (multi select):

http://w2ui.com/web/docs/form/fields-enum

the items array field can either pulled directly url or can predefined array.

it save hassle of creating more selection boxes select persons in 1 field.

or maybe use http://aehlke.github.io/tag-it/


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