before form submit call function javascript

Question

My program manager is a QR-code in php. I have my list of QR-codes and have (among other options) the option to delete the QR-code. When I click delete, I want to bring up a confirmation message in javascript. When I click save, I do not need confirmation.

My form:

<form method="post" enctype="multipart/form-data">
 (...)
 <input type="submit" name="save_edit" value="SAVE" />
 <input type="submit" name="delete" value="Delete QR-code" />
</form>

My code:

if(isset($_POST['delete']))
{
 $id = $_SESSION['tmp_id'];
 $query = mysql_query("SELECT name_file FROM $tbl_query WHERE id='$id'");
 if(mysql_num_rows($query) > 0)
 {
 while($row = mysql_fetch_array($query))
 {
 $result = mysql_query("DELETE FROM $tbl_query WHERE id='$id'");
 unlink("img_qr/".$row["name_file"]);
 if($result)
 {
 $_SESSION['alert_type']=1;
 $_SESSION['msg_alerr']= "QR-code delete!";
 }
 else
 {
 $_SESSION['alert_type']=-1;
 $_SESSION['msg_alert']= "Error!";
 }
 }
 }
}

I tried javascript but it doesn't work:

<script type="text/javascript">
 function confirm() {
 var r=confirm('Are you sure you want to delete??');
 if (r==true)
 {
 //delete file...
 } 
 }
</script>

I want to see a confirmation window before deleting.

• u_mulder: easiest way - <input type="submit" name="delete" value="Delete QR-code" onclick="confirm()" />
• mplungjan: No. onclick="return confirm('...')"
• pc_oc: had tried but not worked, now work! thanks!
• Jorge Campos: @pc_oc Hit there. Would you mind in accept the answer that was given IF it solved your problem? That way it will help others with similar issues. :)

Answer 1

Put this in your form:

<form method="post" enctype="multipart/form-data" onsubmit="return confSubmit();">

And your javascript function should be

<script type="text/javascript">
 function confSubmit() {
 var r=confirm('Are you sure you want to delete??');
 return r;
 }
</script>

• mplungjan: Onsubmit is a good idea, however in this case there is likely another submit too
• pc_oc: but i have more "submits", for example, save
• Jorge Campos: Then you have to create some action value and testit in your javascript function. You asked just for the delete confirmation. Improve your question then I will complete my answer
• mplungjan: It was pretty clear there would be more than one submit :) although I never recommend onclick of a submit, I think in this case it would be the way to do it
• mplungjan: I do not see where objectivity is compromised when thinking with the OP instead of only going with what is already posted