PHP - javascript validation radio button
- by user1806136
i have a form with 3 sets of radio buttons. i want to set a simple javascript validation alert to appear when user clicks on submit when one of the fields is null. how can i do that using javascript ?
my code so far is ..
<?php
session_start();
$Load=$_SESSION['login_user'];
include('../connect.php');
if (isset($_POST['submit']))
{
$v1 = intval($_POST['v1']);
$v2 = intval($_POST['v2']);
$v3 = intval($_POST['v3']);
$total = $v1 + $v2 + $v3 ;
mysql_query("INSERT into Form1 (P1,P2,P3,TOTAL)
values('$v1','$v2','$v3','$total')") or die(mysql_error());
header("Location: mark.php");
}
<center><form method="post" action="mark.php" >
<tr>
<th > School Evaluation <font size="4" > </font></th>
<tr>
<th > Criteria <font size="4" > </font></th>
<th> 4<font size="4" > </font></th>
<th> 3<font size="4" > </font></th>
<th> 2<font size="4" > </font></th>
<th> 1<font size="4" > </font></th>
</tr>
<tr>
<th> Your attendance<font size="4" > </font></th>
<td> <input type="radio" name ="v1" value = "4" onclick="updateTotal();"/></td>
<td> <input type="radio" name ="v1" value = "3" onclick="updateTotal();" /></td>
<td> <input type="radio" name ="v1" value = "2" onclick="updateTotal();" /></td>
<td> <input type="radio" name ="v1" value = "1" onclick="updateTotal();" /></td>
</tr>
<tr>
<th > Your grades <font size="4" > </font></th>
<td> <input type="radio" name ="v2" value = "4" onclick="updateTotal();" /></td>
<td> <input type="radio" name ="v2" value = "3" onclick="updateTotal();" /></td>
<td> <input type="radio" name ="v2" value = "2" onclick="updateTotal();" /></td>
<td> <input type="radio" name ="v2" value = "1" onclick="updateTotal();" /></td>
</tr>
<tr>
<th >Your self-control <font size="4" > </font></th>
<td> <input type="radio" name ="v3" value = "4" onclick="updateTotal();" /></td>
<td> <input type="radio" name ="v3" value = "3" onclick="updateTotal();" /></td>
<td> <input type="radio" name ="v3" value = "2" onclick="updateTotal();" /></td>
<td> <input type="radio" name ="v3" value = "1" onclick="updateTotal();" /></td>
</tr>
</tr>
</table>
i have put
<br>
<td><input type="submit" name="submit" value="Submit" onClick="return validation(form);">
<input type="reset" name="clear" value="clear" style="width: 70px"></td>
</form>
i have try alot of codes but no alert appears!
