javascript 在表单提交之前调用函数javascript
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before form submit call function javascript
提问by pc_oc
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.
我的程序管理器是 php 中的二维码。我有我的二维码列表，并且有（除其他选项外）删除二维码的选项。当我单击删除时，我想在 javascript 中显示一条确认消息。当我点击保存时，我不需要确认。
My form:
我的表格：
<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:
我的代码：
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:
我试过 javascript 但它不起作用：
<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.
我想在删除之前看到一个确认窗口。
回答by Jorge Campos
Put this in your form:
把它放在你的表格中：
<form method="post" enctype="multipart/form-data" onsubmit="return confSubmit();">
And your javascript function should be
你的 javascript 函数应该是
<script type="text/javascript">
function confSubmit() {
var r=confirm('Are you sure you want to delete??');
return r;
}
</script>
