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up vote 1 down vote favorite

I need to introduce JavaScript alert function show_alert() inside PHP code. How this can be done?

script type="text/javascript">
        function show_alert() {
            var msg = "No solution found.";
            alert(msg);
        }
</script>
<?php
//...
    $outputs = -1;
    if ($outputs == -1) {
        echo '<script type="text/javascript"> show_alert(); </script>';
    } else {
        ?>
        <table width="100%">
            <tr>
                <td width="100%"> 
                    <div class="scrollbar" id="chart">
                        <img src="ganttchart.php">
                    </div>
                </td>
            </tr>
        </table>
    <?php
    }
?>
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5 Answers

up vote 5 down vote accepted

Try this, it echos the show_alert(); in PHP:

<script type="text/javascript">
    function show_alert() {
    var msg = "No solution found";
    alert(msg);
    }
</script>

<?php
//...

$output = run_function();
if ($output == -1) {
   echo '<script type="text/javascript"> show_alert(); </script>';
}
?>
share|improve this answer
I tried this code. Alert window doesn't pop-up. I tried to debug this code, but the cursor jumps over show_alert() line... – Klausos Klausos May 19 '12 at 22:47
Try now, fixed $outputs to $output – alexpja May 19 '12 at 22:49
Tested it locally with $output = -1; instead of $output = run_function();, works for me. – alexpja May 19 '12 at 22:53
Well, if you say it works for you, I will accept the answer. For some strange reason I don't see alert box. – Klausos Klausos May 19 '12 at 22:58
1  
$output = run_function(); if ($outputs == -1) { See what I mean? This is from your post. Either $output should be $outputs or viceversa. – alexpja May 19 '12 at 23:13
show 15 more comments
up vote 6 down vote

In-line JavaScript needs to be inside <script> tags. Simply output those as well, in a valid place. Do note that you cannot affect the operation of the PHP code this way though.

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Could you give an example? I tried your suggestion,but probably I did something wrong. – Klausos Klausos May 19 '12 at 22:40
If it didn't work then you didn't follow what I wrote. – Ignacio Vazquez-Abrams May 19 '12 at 22:42
@KlausosKlausos: In what way doesn't it work? Update the question to show the client-side code actually being rendered in the browser. (Hint: If the indented code block isn't in the page source then $outputs doesn't equal -1. Which means the code does work and does exactly what it's intended to do.) – David May 19 '12 at 22:56
up vote 1 down vote

use this 

<script type="text/javascript">
         show_alert();
    </script>

so like this 

$output = run_function();
if ($outputs == -1) {
?>
<script type="text/javascript">
             show_alert();
        </script>
<?php
}
?>
share|improve this answer
I don't know why, but it doesn't work. Alert window should pop-up, but it doesn't. I tried to debug this code. Indeed the cursor jumps over show_alert() line... – Klausos Klausos May 19 '12 at 22:47
does the if statement work? if u echo some php would it work? it might be that $output never == -1. But not sure - sorry – aurel May 19 '12 at 22:53
No,output is equal to -1. That's the case. – Klausos Klausos May 19 '12 at 22:57
up vote 0 down vote 
<?php
    $output = run_function();
    if ($outputs == -1) {
        echo "<script type='text/javascript'>alert("No Solution Found");</script>"
    }
?>
share|improve this answer
My answer is almost the same :/ – alexpja May 19 '12 at 22:57
Mine doesn't ask for a global function that was already defined in the Javascript. Instead, it just runs it without looking for a function – Jonah Allibone May 19 '12 at 22:58
True, but he had the global function in his so I included that in mine. – alexpja May 19 '12 at 23:04
up vote 0 down vote

I would suggest

    $msg = "My message";
    echo "<script type=\"text/javascript\"> alert($msg); </script>";

You are right about it David

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3  
Your double-quotes are probably doing to confuse the parser and produce an error. – David May 19 '12 at 22:54
or just use 'text/javasript' instead since you are using the double quotes for the echo? – alexpja May 19 '12 at 23:09
I think that double quotes (") are more xhtml like and I prefer them! – Johntor May 19 '12 at 23:29

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