如何在PHP代码中引入JavaScript警报窗口

Question

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
    }
?>

Answer 1

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.

Answer 2

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>';
}
?>

Answer 3

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
}
?>

Answer 4

I would suggest

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

You are right about it David

Answer 5

<?php
    $output = run_function();
    if ($outputs == -1) {
        echo "<script type='text/javascript'>alert("No Solution Found");</script>"
    }
?>