Call PHP Script from JavaScript with parameters

Question

I have done a lot of research on Google and StackOverflow but I can't solve this problem (that's why this question is no duplicate): I have a js function, which is called on click (working). With this function I'm trying to call a PHP script to execute... But it doesn't react... Please tell me what's wrong (complete solution would be appreciated...)

PHP code:

<?php
$servername = "bot-sam.lima-db.de:3306";
$username = "USER379138";
$password = "pwd";
$dbname = "db_379138_1";

$q = $_POST['q'];
$a = $_POST['a'];

function alert($msg) {
    echo "<script type='text/javascript'>alert('$msg');</script>";
}

echo $q . $a;
// echo and alert are not opening so i think the php script isn't executing
alert("question is " . $q);
alert("answer is " . $a);

// Create connection
$conn = mysqli_connect($servername, $username, $password, $dbname);
// Check connection
if (!$conn) {
    die("Connection failed: " . mysqli_connect_error());
}

$sql = "INSERT INTO knowledge_base ('question', 'answer')
VALUES ($q, $a)";

if (mysqli_query($conn, $sql)) {
    echo "New record created successfully";
} else {
    echo "Error: " . $sql . "<br>" . mysqli_error($conn);
}
mysqli_close($conn);
?>

JavaScript function (which gets called properly; jQuery working):

function myfunc() {
    var question = "test1";
    var answer = "test2";
    $.ajax({
        url: 'phpscript.php',
        type: 'POST',
        data: {q: question, a: answer},
        dataType: 'json',
        sucess: console.log("SQL entry made")
    });
}

I'm sorry to ask such a simple question but I just can't solve the problem...

dataType: 'json' ? You want to get json from php script, but php echoes html! — Eugen
– Eugen, Commented Feb 15, 2018 at 17:53
Is that the correct URL? The browser will assume that script is in the same folder as the page you're on (unless you have a <base> tag). Also, your success function looks suspicious. I believe you need to specify something like function() { ... }. — kmoser
– kmoser, Commented Feb 15, 2018 at 17:53
Your code contains an SQL injection vulnerability -- you are passing raw, unfiltered, unvalidated user input directly into an SQL string. SQL injection is very easy to fix. — gattsbr
– gattsbr, Commented Feb 15, 2018 at 17:53
Also it seems like you may have given us the actual credentials and info needed to login to your DB - you may want to change that — General_Twyckenham
– General_Twyckenham, Commented Feb 15, 2018 at 17:55
if both/either question or answer are strings the sql needs for those values to be quoted. As @gattsbr points out - this is vulnerable to sql injection. The alert statements will not do the alert as you are calling the php script with ajax... — Professor Abronsius
– Professor Abronsius, Commented Feb 15, 2018 at 18:12

Sathishkumar · Accepted Answer · 2018-02-15 17:52:41Z

2

Try to use the below code

function myfunc() {
    var question = "test1";
    var answer = "test2";
    $.ajax({
        url: 'phpscript.php',
        type: 'POST',
        data: {q: question, a: answer},
        dataType: 'json',
        success: function(result) {
         console.log(result);
       }
    });
}

answered Feb 15, 2018 at 17:52

Sathishkumar

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3 Comments

fipsi Over a year ago

the code isn't working but now the success function doesn't call

fipsi Over a year ago

i changed the dataType to text ... Now the sucess function gets called but the SQL database is empty...

Sathishkumar Over a year ago

@fipsi what is the console.log output?

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