How do I send an array of values to my php script?

Question

I want to send the values in the HTML form to a php script, which should be able to read those values.

HTML :

 <form id="details" method="POST" onsubmit="return submit(n,i,p,e,img)">

        Full name: <strong name="name_1"></strong><br><br>
        ID No:<strong name="org_number_1"></strong><br><br>
        Mobile No:<strong name="ph_number_1"></strong><br><br>
        
        E-mail: <strong name="email_1"></strong><br><br>
        ID Card: <img src="" alt="preview" name="image" style="width: 100px; height: 100px;"><br><br>

        <button id="go" type="submit">It's correct</button>
        
    </form>

    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
    <script src="preview_back_end.js" async></script>

Javascript :

function submit(n,i,p,e,img){

    console.log("Going into submit()")

    $.ajax({
        type : "POST",  //type of method
        url  : "database_registration.php",  //your page
        data : { name_1 : n, email_1 : e, image : img, org_number_1: i, ph_number_1: p },// passing the values
        success: function(){  
                                //do what you want here...
                                alert(data);
                }
    });

    return false;
}


var arr=document.cookie.split(';')
for(var i=0; i<arr.length; i++){

    var c=arr[i].split('=');
    if (c[0].trim()=='name'){
        
        document.getElementsByName("name_1")[0].innerHTML=decodeURIComponent(c[1]);
        var nme=decodeURIComponent(c[1]);
    }
    else if(c[0].trim()=='ID No'){
        
        document.getElementsByName("org_number_1")[0].innerHTML=decodeURIComponent(c[1]);
        var id=decodeURIComponent(c[1]);
    }
    else if(c[0].trim()=='Mobile No'){
        
        document.getElementsByName("ph_number_1")[0].innerHTML=decodeURIComponent(c[1]);
        var phone=decodeURIComponent(c[1]);
    }
    else if(c[0].trim()=='Email'){
        
        document.getElementsByName("email_1")[0].innerHTML=decodeURIComponent(c[1]);
        var email=decodeURIComponent(c[1]);
    }
}

const image = localStorage.getItem("Image");
document.getElementsByName("image")[0].src=image;
var img=image
submit(nme,id,phone,email,img);

php :

 <?php

// Server name is localhost 
$servername = "localhost"; 
  
// In my case, user name will be root 
$username = "root"; 
  
// Password is empty 
$password = ""; 

//current date
$date = date("Y-m-d");

// get values

$name=$_POST['name_1'];
$org_number=$_POST['org_number_1'];
$ph_number=$_POST['ph_number_1'];
$email=$_POST['email_1'];
$image=$_POST['image'];


echo $name ."<BR>";
echo $org_number ."<BR>";
echo $ph_number ."<BR>";
echo $email ."<BR>";
echo $image ."<BR>";

 
// Creating a connection 
$conn = new mysqli($servername,  
            $username, $password, "Employee_information"); 
  
// Check connection 
if ($conn->connect_error) { 
    die("Connection failure: " 
        . $conn->connect_error); 
}  
  
// Creating a table Employees 
$sql="CREATE TABLE IF NOT EXISTS Employees(Sl_no int AUTO_INCREMENT PRIMARY KEY, Full_name varchar(30) NOT NULL, 
      ID_no INT(2) NOT NULL, Contact INT(10) NOT NULL, Email varchar(30) NOT NULL, registration_date DATE, 
      ID_preview blob(10M))";
$conn -> query($sql);

// Inserting records
$stmt = $conn->prepare("INSERT INTO Employees (Full_name, ID_no, Contact, Email, 
                                    registration_date, ID_preview) 
                                    VALUES (?, ?, ?, ?, ?, ?)");
$stmt->bind_param("siissb", $name, $org_number, $ph_number, $email, $date, $image);
$stmt->execute();

if($stmt->execute())
    echo "records inserted";
else
    echo $stmt->error;
  
// Closing connection 
$stmt->close();
$conn->close(); 
?>

When I run this, I get an error in the php script:

Warning: Undefined array key "name_1" 
Warning: Undefined array key "org_number_1" 
Warning: Undefined array key "ph_number_1"
Warning: Undefined array key "email_1"

Along with that, I get this error in my console:

POST http://127.0.0.1:5500/database_registration.php 405 (Method Not Allowed)

---

Why are the array keys undefined? What does the console error mean? How do I fix this?

EDIT: Tried to print the $_POST array, using:

<?php
    echo 'Post variables:<br />';
    print_r($_POST);
?>

Array is completely empty:

Post variables:
Array ( ) 

Answer 1

You should return false when you submit the form. It's submitting the default form. Please try this:

<form id="details" method="POST" onsubmit="return submit(n,i,p,e,img)">
      <!-- Your code here -->
</form>




  <script>
    function submit(n,i,p,e,img){
        //Your Ajax request here
    
    
    
        return false;
    }
   </script>

Answer 2

The problem is that you don't prevent the traditional submit acction.

Generally is better to use addEventListener than then old onsubmit HTML attribute.

I modified your code so that it works:

HTML

 <form id="details" method="POST">

        Full name: <strong name="name_1">1</strong><br><br>
        ID No:<strong name="org_number_1">2</strong><br><br>
        Mobile No:<strong name="ph_number_1">3</strong><br><br>
        
        E-mail: <strong name="email_1">4</strong><br><br>
        ID Card: <img src="" alt="preview" name="image" style="width: 100px; height: 100px;"><br><br>

        <button id="go" type="submit">It's correct</button>
        
    </form>

    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
    <script src="preview_back_end.js" async></script>

preview_back_end.js

function submit(n,i,p,e,img){

    console.log("Going into submit()")

    $.ajax({
        type : "POST",  //type of method
        url  : "database_registration.php",  //your page
        data : { name_1 : n, email_1 : e, image : img, org_number_1: i, ph_number_1: p },// passing the values
        success: function(){  
                                //do what you want here...
                                alert("ok");
                }
    });

    
}

const dForm = document.getElementById('details');          
dForm.addEventListener('submit', function(e) {
    e.preventDefault()
    submit(nme,id,phone,email,img);
});


var arr=document.cookie.split(';')
for(var i=0; i<arr.length; i++){

    var c=arr[i].split('=');
    if (c[0].trim()=='name'){
        
        document.getElementsByName("name_1")[0].innerHTML=decodeURIComponent(c[1]);
        var nme=decodeURIComponent(c[1]);
    }
    else if(c[0].trim()=='ID No'){
        
        document.getElementsByName("org_number_1")[0].innerHTML=decodeURIComponent(c[1]);
        var id=decodeURIComponent(c[1]);
    }
    else if(c[0].trim()=='Mobile No'){
        
        document.getElementsByName("ph_number_1")[0].innerHTML=decodeURIComponent(c[1]);
        var phone=decodeURIComponent(c[1]);
    }
    else if(c[0].trim()=='Email'){
        
        document.getElementsByName("email_1")[0].innerHTML=decodeURIComponent(c[1]);
        var email=decodeURIComponent(c[1]);
    }
}

const image = localStorage.getItem("Image");
document.getElementsByName("image")[0].src=image;
var img=image