Transmitting PHP variable to JavaScript using Callback Method

I am looking to implement password validation using JavaScript along with an Ajax function. Upon successful validation, I aim to return a boolean variable (true or false) and perform specific actions in my PHP file based on the callback.

Unfortunately, my current code setup is not functioning as expected. Below is the snapshot of my code:

PHP script: update.php

<input href="javascript:void(0);" role="button" type="submit" value="Submit" onclick="ValidatePassword()>'

JAVASCRIPT function: ValidatePassword()

Within my JavaScript function, I utilize an ajax call to validate the password. Upon successful validation, the result should be passed back to the PHP function.

 $.ajax({
    type: "POST",
    url: "checkpw.php",
    data: dataString,
    cache: false,
    success: function(response)
    {
        if (result != -1 )
        {
            $("#passwd").val('');

            // RETURN TO PHP FILE update.php -> PW IS VALID
        } else {
            // RETURN TO PHP FILE update.php -> PW IS INVALID
        }
    }
});

PHP script: update.php

My goal is to utilize the callback from the php function like follows:

<?php

if (passwordCallback == true)
...
else
...

?>

How can I modify the ajax success function to effectively pass the value back to my php file?

javascriptphpjqueryajax

Answer №1

Just a heads up, if the code here is not written properly, it could potentially open up security vulnerabilities. On the flip side, if the code is done correctly, there's a possibility of password verification being carried out twice unnecessarily.

One alternative approach would be:

 $.ajax({
    type: "POST",
    url: "checkandupdate.php", //A combination of both
    data: dataString,
    cache: false,
    success: function(response)
    {
        if (result != -1 ) {
            $("#passwd").val('');    
        }
    }
});

Regarding checkandupdate.php file:

<?php
require "checkpw.php"; // Or any other method for password validation
// At this stage, "checkpw.php" will determine password validity and ideally provide an outcome
// Let's assume $passwordIsValid stores the result as a boolean signaling success
if ($passwordIsValid) {
    // Implement necessary actions upon successful password verification
    echo "1"
}
else {
   // Carry out required tasks when password verification fails
   echo "-1";
}
?>

Answer №2

To successfully send data back to PHP using JavaScript, you can create a function like the following:

function sendReturnToPHP(url, result) {
  $.ajax({
    type: "POST",
    url: url,
    data: JSON.parse(result),
    cache: false,
    success: function(response) {}
  });
}

You can then easily invoke this function within your request success handler.

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