JQuery returned data from php file

Question

I'm new in JQuery. I have managed to return data to JQuery from php script but now I get to see the message  when I show the returned message from php script to the user and I only want to display my message to the user using alert().

Can someone explain what is that meaning?
How to avoid it to be shown to the alert box?

PHP code:

<?php
    include "initialize.php";
    if(empty($_POST) === false){
        global $con;
        $message = "";
        $email = trim($_POST["email"]);
        if(isSubscribed($email) === false){
            $message = "Thank you for subscribing to our latest updates";
            mysqli_query($con,"INSERT INTO subscribers(email) VALUES('".$email ."')");
        }
        else{
            $message = "You already subscribed.";
        }
        echo $message;
    }
?>

JQuery Code:

$(function () {
    $('#frms').on('submit', function (e) {
        var email = $("#email").val();
        if (!validateEmail(email)) {
            alert('Error: Make sure you provided a valid email address');
        }
        else {
            $.ajax({
                type: 'post',
                url: 'initialize/subscribe.php',
                data: $('#frms').serialize(),
                success: function (data) {
                    alert(data);
                }
            });
        }

        e.preventDefault();
    });
});

what is that meaning - what?

u_mulder
– u_mulder

2017-02-09 12:50:13 +00:00
Commented Feb 9, 2017 at 12:50 — u_mulder
– u_mulder, Commented Feb 9, 2017 at 12:50

BadHorsie · Accepted Answer · 2017-02-09 13:07:59Z

2

<!--Separate connection with sessions -->

This is an HTML comment, and it probably means when you call the PHP script from your jQuery, that HTML is also added somewhere to the response.

i.e. Your PHP "page" is not only echoing your message; it is echoing that HTML as well.

A quick fix is to kill the PHP script immediately after you echo your message, to prevent any other output from being returned to the jQuery.

echo $message;
die;   // Add this

This will terminate the script after you echo your message, and not allow any other output to be generated.

If you still see the HTML after adding die, it probably means the HTML is added before you echo your message. In which case it might be in initialize.php and you would have to prevent that other script from echoing anything as well.

answered Feb 9, 2017 at 13:07

BadHorsie

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3 Comments

BadHorsie Over a year ago

You just need to find  it's somewhere in your project.

Calvin Masindi Over a year ago

Thanks BadHorsie, I found out that this output  was being generated on this script initialize.php

BadHorsie Over a year ago

@MCi Yes I said that in my answer.

Rupesh kumar Sharma · Accepted Answer · 2017-02-09 13:10:46Z

1

return data like this :

$returnArr=array(); returnArr['message']=$message;

echo json_encode(returnArr);

exit;

and at client side use this code alert(data.message);

answered Feb 9, 2017 at 13:10

Rupesh kumar Sharma

615 bronze badges

4 Comments

Calvin Masindi Over a year ago

I did try that code and is now giving me this message undefined

Calvin Masindi Over a year ago

This what i get  {"message":"You already subscribed."} when i output data alert(data) only

Rupesh kumar Sharma Over a year ago

use this: var obj = jQuery.parseJSON(data); alert( obj.message );

Calvin Masindi Over a year ago

Thanks for your effort. your help lead me to find the solution.

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