How to add php content or variable inside javascript alert box?! javascript, php, alertbox

Question

How can i add php content or php variable inside Java-script alert box?! I tried to make it work few ways but it is only popping up a blank box rather than the contents of php variable.

Here is the code:

<script language="javascript">
    $(document).ready(function() {
        $("#a").blur(function() {           
            <?php $b = $_POST['a'];

            if(isset($_POST['update'])) {
            mysql_query("UPDATE tbl_travel set fld_a='".$_POST[$b]."' where fld_id = '".$_POST["id"]."' ") or die(mysql_error());
            } ?>

                alert (<?php $b ?>);
           });
    });
</script>

Thank You for your Help :)

possible duplicate of [Passing a PHP variable to JavaScript](http://stackoverflow.com/questions/16148772/passing-a-php-variable-to-javascript) — M Khalid Junaid, Sep 07 '13 at 10:21
@dianuj: well i guess it is, but i tried to search the question for duplicate entry before posting the question!! — Pooja, Sep 07 '13 at 10:22
The `mysql_*` functions are **no longer maintained** and shouldn't be used in any new codebase. It is being phased out in favor of newer APIs. Instead you should use [**prepared statements**](https://www.youtube.com/watch?v=nLinqtCfhKY) with either [PDO](http://php.net/pdo) or [MySQLi](http://php.net/msqli). — tereško, Sep 07 '13 at 23:22

Sergio · Accepted Answer · 2013-09-07T10:07:16.957

8

Change this

alert (<?php $b ?>);

to this

alert ('<?php echo $b; ?>');

You need to output the value of $b and add quotes inside the alert.

About PHP - echo

edited Sep 07 '13 at 10:07

answered Sep 07 '13 at 09:59

Sergio

28,539
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Hey thanks for the answer totally missed using echo before $b. BTW need to put double quotes too alert (""); – Pooja Sep 07 '13 at 10:05
I would love to but i cant do that due to very less reputation...!! If you don't mind please rate my question i need to have 15points..Thanks :) – Pooja Sep 07 '13 at 10:19
1

You don't need low reputation to accept answer, just to upvote. You get also +2 when you accept. :) – Sergio Sep 07 '13 at 10:21
oh is it...!! please let me know from where can i accept the answer...as i am a noob here ;) Thanks for an upvote..appreciate it :) – Pooja Sep 07 '13 at 10:25
1

@Pooja, under the score of the answer were you can upvote and downvote there is a check mark, press there in the answer you want to accept and you get +2 reputation. You have some other old questions you asked were you can do that also :) – Sergio Sep 07 '13 at 10:28
1

@Pooja, exactly! if you do that on your other questions you will get more reputation also – Sergio Sep 07 '13 at 10:30
1

oh yes i found it! Thanks for informing about that...accepted your answer ^_^ – Pooja Sep 07 '13 at 10:31

score 3 · Answer 2 · edited Sep 07 '13 at 10:17

3

Have you tried this?

alert ('<?php echo $b ?>');

edited Sep 07 '13 at 10:17

M Khalid Junaid

63,861
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answered Sep 07 '13 at 09:59

mkas

351
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8

score 2 · Answer 3 · edited Nov 17 '16 at 02:06

2

I use it like this

$text="Example PHP Variable Message";
echo '<script type="text/javascript">alert("'.$text.'")</script>';

edited Nov 17 '16 at 02:06

Danh

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answered Nov 16 '16 at 18:59

Zafer BAHADIR

99
4

score 1 · Answer 4 · edited Jan 22 '14 at 12:16

1

1.

<script>
  alert("</script><?php $r=5;echo $r;?> <script>")
</script>

you have to script off on when php start

edited Jan 22 '14 at 12:16

TLama

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answered Jan 22 '14 at 11:48

jignesh

11
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score 0 · Answer 5 · answered Mar 07 '18 at 16:52

0

This worked for me :

alert ("<?php echo $b; ?>");

answered Mar 07 '18 at 16:52

Praveesh P

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How to add php content or variable inside javascript alert box?! javascript, php, alertbox

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