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POPHP selection based on previous selection
 

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    <p>I have 2 functions in PHP, one of them displays the ISBN and the title of a book and the other displays the editions that exist in the database based on the ISBN selected on the previous selection.</p> <p>Here are the 2 functions:</p> <p>ISBN - Book dropdown list:</p> <pre><code> &lt;?php include ("includes/connections.php"); function dropdown($intIdField, $strNameField, $strTableName, $strOrderField, $strNameOrdinal, $strMethod="asc") { echo "&lt;select name=\"$strNameOrdinal\" onchange=\"selection($id)\"&gt;\n"; echo "&lt;option value=\"NULL\"&gt;Select Value&lt;/option&gt;\n"; $strQuery = "select $intIdField, $strNameField from $strTableName order by $strOrderField $strMethod"; $rsrcResult = mysql_query($strQuery); while($arrayRow = mysql_fetch_assoc($rsrcResult)) { $strA = $arrayRow["$intIdField"]; $strB = $arrayRow["$intIdField"] . " - " . $arrayRow["$strNameField"]; echo "&lt;option value=\"$strA\"&gt;$strB&lt;/option&gt;\n"; } echo "&lt;/select&gt;"; } ?&gt; </code></pre> <p>Edition dropdown list:</p> <pre><code>&lt;?php include ("includes/connections.php"); function dropdownEdition($intId1Field, $intId2Field, $strTableName, $strOrderField, $strNameOrdinal, $strMethod="asc") { $intId2Field = $GLOBALS['book']; var_dump($intId2Field); var_dump($_POST["book"]); echo "&lt;select name=\"$strNameOrdinal\"&gt;\n"; echo "&lt;option value=\"NULL\"&gt;Select Value&lt;/option&gt;\n"; $strQuery = "SELECT $intId1Field, $intId2Field FROM $strTableName ORDER BY $strOrderField $strMethod"; $rsrcResult = mysql_query($strQuery); while($arrayRow = mysql_fetch_assoc($rsrcResult)) { $strA = $arrayRow["$intId1Field"]; echo "&lt;option value=\"$strA\"&gt;$strA&lt;/option&gt;\n"; } echo "&lt;/select&gt;"; } ?&gt; </code></pre> <p>What I have been trying to do is pass the ISBN selected on the previous selection with a <code>onchange</code> function which would return the ISBN of the book but it failed a lot.</p> <pre><code>&lt;?php function selection($id){ echo $id; } ?&gt; </code></pre> <p>I know I'm terrible at this but I don't know what else to do if you could point me to a direction it would be much appreciated.</p> <p>I would prefer a PHP solution rather than a JavaScript one if possible.</p>
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    1. COyou can't do that without using `javascript`
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