PHP获取按钮ID

Question

Is it possible to get the button ID? I have accumulated forms and I wanted to get the button clicked using the unique ID. The following scripts I used:

echo("<table><tr>
    <td id=\"i\"><img src='presentations/uploaded_files/$name.png' alt='animal' width='50px' height='50px'/></td>
    <td id=\"n\">$name</td>
    <td id=\"d\">$dsc</td>
    <td id=\"t\">$type</td>
    <td id=\"g\">$grade</td>
    <td id=\"b\">
    <form enctype=\"multipart/form-data\" action=\"admin_update_animal.php\" method=\"POST\"><input type=\"submit\" value=\"Update\" name=\"update\" id=\"$name\"/></form></td>
</tr></table>");

I used the following when any of the button clicked:

if (isset($_POST['update'])) { 
$f=trim($_POST['update']);
}

But I wanted to get which button clicked using its unique ID assigned. I am very glad for a help. Thanks.

Answer 1

You cannot directly read the id of a control because name is passed to the server side script via any methods. You can use hidden input fields whose value can be the id of the button. This lets you know the id of the button in the server side. This can be done as:-

<script type="text/javascript">
  function createField(id)
  {
         var x = document.getElementById("hide");
         var y = "<input type='hidden' name='iddetector' value='"+id+"'/>";
         x.innerHTML = y;
        return;
  }
</script>
//maintain other stuffs here and now
<input type="submit" id="uniqueid" name="submit" value="submit"onClick="createField('uniqueid');return true;"/><br>
<div id="hide"></div>

You can detect the id of the button i the sever side as:-
 <?php
    $idButton = isset($_POST['iddetector'])?$_POST['iddetector']:NULL;
     echo "The id of the button clicked is ".$idButton;
  ?>