Javascript alert not working for first array value in php

Question

I am implementing clothing shopping website and currently i am working on add to cart. on every cloth item there is add to cart button through which item is added to cart. i am using session array for storing values in cart. i am using javascript alert to show message "Item added to cart" when add to cart button is clicked. i am facing problem that when i click add to cart button first time it doesn't show any message but it works perfectly for 2nd and all other time. only on first click it shows nothing.

Code:

<?php
session_start();
$connect = mysqli_connect("localhost", "root", "", "login");
if (isset($_POST["add_to_cart"])) {
  if (isset($_SESSION["shopping_cart"])) {

    $item_array_id = array_column($_SESSION["shopping_cart"], "item_id");
    if (!in_array($_GET["id"], $item_array_id)) {
      $count = count($_SESSION["shopping_cart"]);
      $item_array = array(
        'item_id' => $_GET["id"],
        'item_description' => $_POST["dress_description"],
        'item_price' => $_POST["price"],
        'item_quantity' => $_POST["dress_quantity"],
        'item_gender' => $_POST["gender_name"]
      );

      $_SESSION["shopping_cart"][$count] = $item_array;
      echo '<script>alert("Item Added to Cart")</script>';
      echo '<script>window.location="portfolionew.php"</script>';
    } else {
      echo '<script>alert("Item Already Added")</script>';
      echo '<script>window.location="portfolionew.php"</script>';
    }
  } else {
    $item_array = array(
      'item_id' => $_GET["id"],
      'item_description' => $_POST["dress_description"],
      'item_price' => $_POST["price"],
      'item_quantity' => $_POST["dress_quantity"],
      'item_gender' => $_POST["gender_name"]
    );
    $_SESSION["shopping_cart"][0] = $item_array;
    echo '<script>alert("Item Added to Cart")</script>';
    echo '<script>window.location="portfolionew.php"</script>';
  }
}
?>


// and this is cart button:
<input type="submit" name="add_to_cart" class="fa fa-shopping-cart" value="Cart">

just using javascript alert you can see where i am echoing javascript alert — Shoaib Sharoon, Aug 16 '17 at 07:40
maybe session `isset($_SESSION["shopping_cart"])` is not set and it's not getting inside `if` condition — Muthu Kumaran, Aug 16 '17 at 07:42
Your session is setting on first redirect. i.e. `else` is being executed on first time. 2nd time it goes to `if`. — Fawkes, Aug 16 '17 at 07:43
Write Item added alert in `else` part of `if (isset($_SESSION["shopping_cart"])) {`. Because, first time, there is no session set for items. — Nana Partykar, Aug 16 '17 at 07:44
@Nana Partykar can you anwser this question please https://stackoverflow.com/q/45713744/8380733 — Shoaib Sharoon, Aug 16 '17 at 12:53

score 1 · Answer 1 · answered Aug 16 '17 at 08:17

Here issue is for first time your not added code to alert. Change code from

<?php
    session_start();
    $connect = mysqli_connect("localhost", "root", "", "login");
    if (isset($_POST["add_to_cart"])) {
      if (isset($_SESSION["shopping_cart"])) {

        $item_array_id = array_column($_SESSION["shopping_cart"], "item_id");
        if (!in_array($_GET["id"], $item_array_id)) {
          $count = count($_SESSION["shopping_cart"]);
          $item_array = array(
            'item_id' => $_GET["id"],
            'item_description' => $_POST["dress_description"],
            'item_price' => $_POST["price"],
            'item_quantity' => $_POST["dress_quantity"],
            'item_gender' => $_POST["gender_name"]
          );

          $_SESSION["shopping_cart"][$count] = $item_array;
          echo '<script>alert("Item Added to Cart")</script>';
          echo '<script>window.location="portfolionew.php"</script>';
        } else {
          echo '<script>alert("Item Already Added")</script>';
          echo '<script>window.location="portfolionew.php"</script>';
        }
      } else {
        $item_array = array(
          'item_id' => $_GET["id"],
          'item_description' => $_POST["dress_description"],
          'item_price' => $_POST["price"],
          'item_quantity' => $_POST["dress_quantity"],
          'item_gender' => $_POST["gender_name"]
        );
        $_SESSION["shopping_cart"][0] = $item_array;
      }
    }
    ?>

to

<?php
session_start();
$connect = mysqli_connect("localhost", "root", "", "login");
if (isset($_POST["add_to_cart"])) {
  if (isset($_SESSION["shopping_cart"])) {

    $item_array_id = array_column($_SESSION["shopping_cart"], "item_id");
    if (!in_array($_GET["id"], $item_array_id)) {
      $count = count($_SESSION["shopping_cart"]);
      $item_array = array(
        'item_id' => $_GET["id"],
        'item_description' => $_POST["dress_description"],
        'item_price' => $_POST["price"],
        'item_quantity' => $_POST["dress_quantity"],
        'item_gender' => $_POST["gender_name"]
      );

      $_SESSION["shopping_cart"][$count] = $item_array;
      echo '<script>alert("Item Added to Cart")</script>';
      echo '<script>window.location="portfolionew.php"</script>';
    } else {
      echo '<script>alert("Item Already Added")</script>';
      echo '<script>window.location="portfolionew.php"</script>';
    }
  } else {
    $item_array = array(
      'item_id' => $_GET["id"],
      'item_description' => $_POST["dress_description"],
      'item_price' => $_POST["price"],
      'item_quantity' => $_POST["dress_quantity"],
      'item_gender' => $_POST["gender_name"]
    );
    $_SESSION["shopping_cart"][0] = $item_array;

    /***************** add ********************/
    echo '<script>alert("Item Added to Cart")</script>';
    echo '<script>window.location="portfolionew.php"</script>';

  }
}
?>

I think this could be a better answer if you post the additional code separate and explain how / why this additional code should used. — Max, Aug 16 '17 at 12:04

Javascript alert not working for first array value in php

1 Answers1