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echo alert() in php show everything in the string. octobercms plugin

I'm having issue when echoing alert() in php. It show everything in the string.
echo "<script type='text/javascript'>alert('Thank you for your enquiry, we will contact you as soon as possible, have a nice day!');</script>";
Output

You can use javascript code between ending and starting php tags like below,
?>
<script type="text/javascript">
alert('Thank you for your enquiry, we will contact you as soon as possible, have a nice day!');
</script>
<?php
// rest of the php code will go here.
?>
OR try this please,
<?php
echo '<script type="text/javascript">';
echo 'alert("Thank you for your enquiry, we will contact you as soon as possible, have a nice day!");';
echo '</script>';
?>

Solution: I fixed it by removing everything. and just echo the message directly without the alert(). I'm not sure why it behave like this because this is my custom plugin. I will update if I found the source of this behavior. Thank you for all the replies.
echo 'Email Successfully Sent. We will reply soon!';

Cannot echo .load function

For some reason this code doesn't work. Adding \ to the front of the $ doesn't change anything. Can anyone see the problem?
$commentid = 2; //for example
echo "<script>";
echo "<div id = 'commentinput".$commentid."'>";
echo "</div>";
echo "$('#commentinput".$commentid."').load('editcomments2.php')";
echo "</script>";

Do it like this:
echo '$("#commentinput'.$commentid.'").load("editcomments2.php")';

I'd suggest not using echo to output HTML (in most cases anyway), but closing the PHP tag instead.
This becomes (edited with a loop example, see comments below):
<?php while ($commentid = $dbObject->dbMethod()): ?>
<div id="commentinput<?= $commentid ?>">
</div>
<script>
$('#commentinput<?= $commentid ?>').load('editcomments2.php');
</script>
<?php endwhile ?>
Note that in this case, the <script> portion should probably be outside of the loop, with a jQuery selector matching all the comment inputs.

So besides all of the other answers, I found another solution to!
When echoing out js code, like
echo '$("#commentinput'.$commentid.'").load("editcomments2.php")';
//and
echo "alert('stuff')";
it might then print it out like: $("#commentinput2").load("editcomments2.php")alert('stuff') and the code will get confused. So lastly I need to added a semicolon to prevent the program from reading all my code as just 1 line:
echo '$("#commentinput'.$commentid.'").load("editcomments2.php")';

javascript alert and then a location replace not working

I trying to use an alert message when someone enters incorrect login details, and I then want to redirect them back to the same login page. I'm doing this inside a php file that is called when someone submits a login form. I'm trying something like this:
echo '<script language="javascript">';
echo 'alert("Invalid Username or Password")';
echo 'location.replace("target.php")';
echo '</script>';
but it goes to the php file itself, which shows nothing.

update it you have missing ; for alert
echo '<script language="javascript">';
echo 'alert("Invalid Username or Password");';
echo 'window.location("target.php")';
echo '</script>';

echo '<script>';
echo 'alert("Invalid Username or Password"); ';
echo 'location.replace("http://mywebsite.com/target.php"); ';
echo '</script>';
language attribute is deprecated
location.replace("target.php") must have valid url: location.replace("http://mywebsite.com/target.php") or you can use history.back()
and as noted, don't miss semicolon

Show a timed message between submit and reload

I have a "Bootstrap" form. When the user press "Submit" data is sent to file.php If the database is updated, I have an alert in that php file which echos an alert with "success". Now I'd like to alert a timed message. Not the alertbox with "OK" button. Is there some small simple code for this?
This is what I have now!
PHP
//Echo succes
echo "<script type='text/javascript'>";
echo "alert('Välkommen ".$row['usr_fname']." ".$row['usr_lname']."');";
echo 'window.location = "../back_to_form.html"';
echo "</script>";
die();

You could potentially use something like Jquery UI to fake a dialog box. Then the reloading could happen just like you want it to. The code would look something like this (untested, you'd need to adapt it to your app):
echo "<html><body>";
echo '<script src="//code.jquery.com/ui/1.11.3/jquery-ui.js"></script>';
echo "<div id="dialog" title="Basic dialog">";
echo "<p>Välkommen ".$row['usr_fname']." ".$row['usr_lname']."</p>";
echo "</div>";
echo "<script type='text/javascript'>window.settimeout(window.reload(), 5000)</script>";
echo "</body></html>";
More info with a better javascript example for the jquery ui message box can be found here

Embedding multiline alert box in php code

I would like to embed a JavaScript alert box into php code and would like the text to report variable values. The following code gives multiline but does not enable me to use variables.
?>
<script type="text/javascript">
alert("Total size of all files too large.\nConsider uploading files in smaller sets.\nYou can append to existing sets.");
document.location.href="SomewhereElse.php";
</script>
<?php
The following code lets me use variables but does not give multiline.
$Str="Total size cannot be not more than " . ini_get('post_max_size');
echo "<script type='text/javascript'>\n";
echo "alert('" . $Str . "');";
echo "</script>";
When I try this code, no alert box comes up.
$Str="Unable to load (all of) these files because of their (total) size" .
"\nPlease make the upload set conform to the following parameters";
echo "<script type='text/javascript'>\n";
echo "alert('" . $Str . "');";
echo "</script>";
I do get an alert box if I leave the \n (before the Please) out but it is not multiline. I am wondering if the \n dismisses the alert box. At any rate, how do I get a multiline alert box with variables?

try something like this:
<?php
$max_size = ini_get('post_max_size');
echo '<script>';
echo 'alert("Total size cannot be more than ' . $max_size . '!\nPlease make sure...");';
echo '</script>';
?>