无法从PHP

Question

我有一个javascript函数来选择选中的选项来选择表格单元格的内容：

<script>
function getValue(selValue) {
if(selValue == "Apple")
    document.getElementById("fruittype").innerHTML = "A";

if(selValue == "Banana")
    document.getElementById("fruittype").innerHTML = "B";

if(selValue == "Orange")
    document.getElementById("fruittype").innerHTML = "C";
}
</script>

以下是我正在调用的php函数：

<?php
function retainFormOnLoad($fruit)
{           
    echo "<form d='form1' name='form1' method='post' >";
    echo "<table>";
    echo "<tr>
        <td>Congress Database</td> 
        <td style='text-align: center;'>
        <select name='fruit' id='fruit' onchange='getValue(document.getElementById('fruit').value)'>
            <option value='-1' selected disabled>Select your option</option>
            <option value='Apple' ".(($fruit=='Apple')?'selected':'')." >Apple</option>
            <option value='Banana' ".(($fruit=='Banana')?'selected':'')." >Banana</option>
            <option value='Orange' ".(($fruit=='Orange')?'selected':'')." >Orange</option>              
        </select>
     </td>
  </tr>";
  echo "<tr>
     <td id='fruittype'>A</td>
     <td>Always Good!</td>
  </tr>";
 echo "<tr><td colspan='2'><input type='reset' value='Clear' onclick='reset()'></td></tr>
</table></form>";
}
?>

当我调用上面的函数时，表单字段的默认值已设置，但onchange和onclick javascript函数不起作用。我哪里错了？请帮忙

（***我必须只使用PHP来回应表格）