Having a collection of JSON objects, I am unable to remove an element using the pop() method in JavaScript

Hello everyone, I have a collection of JSON objects that are initially set to null in the program like this:

var jsonToSaveToDB = [
        {
            ProductID: null,
            Quantity: null,
            TotalPrice: null
        }
    ];

As the program progresses, a function fills up this array with actual data as shown below:

var jsonToSaveToDB = [

  {
        ProductID: 1,
        Quantity: 4,
        TotalPrice: 12.80
    },
    {
        ProductID: 2,
        Quantity: 2,
        TotalPrice: 12.80
    },

    ..... other elements of the array

    {
        ProductID: null,
        Quantity: null,
        TotalPrice: null
    }
];

I intend to retrieve and display the last element of the array since it contains null values for all its properties.

However, there's a limitation - I cannot remove an element from the array. If you're curious about my code structure, take a look below:

<script>
var jsonToSaveToDB = [
    {
        ProductID: null,
        Quantity: null,
        TotalPrice: null
    }
];

///some codes....
//....
$(document).ready(function(){

   function checkoutNow() {

        $.each(carted_prods, function (index, element) {
            var newObj = {
                ProductID: parseInt(element.itemID),
                Quantity: parseInt(element.itemQuantity),
                TotalPrice: parseFloat(element.itemPrice)
            };
            jsonToSaveToDB.unshift(newObj);
        });

        console.log(jsonToSaveToDB);

        if (jsonToSaveToDB.length > 0) {
            $.ajax({
                url: '/POS/POS/CheckoutProducts',
                data: { json: JSON.stringify(jsonToSaveToDB) },
                contentType: "application/json",
                success: function (result) {
                    console.log(result);
                }
            });
        }


        //console.log("Checkout now.");
    }

});

</script>

Answer №1

If you are encountering an issue in the `jsonToSaveToDB` array where the last element always has null values for `ProductID, Quantity, TotalPrice`, you can simply eliminate them by using `jsonToSaveToDB.pop()`.

If you are unsure of the position of the object element in the `jsonToSaveToDB` array, you can filter them out accordingly.

`jsonToSaveToDB.filter(obj => obj.ProductID !== null)`

I trust this explanation is helpful. Feel free to reach out if you have any questions or concerns.

Answer №2

My recommendation would be to avoid initializing the array of object properties with null values in the beginning. Instead, start with:

var jsonToSaveToDB =[] 

Also, consider using the following function:

function checkoutNow() {
    $.each(carted_prods, function (index, element) {
        if(element.itemID || element.itemQuantity || element.itemPrice){
            var newObj = {
                ProductID: parseInt(element.itemID),
                Quantity: parseInt(element.itemQuantity),
                TotalPrice: parseFloat(element.itemPrice)
            };
            jsonToSaveToDB.unshift(newObj);
        }
   });
   ... Other codes
}

This code will populate the array without including null object values. Additionally, it includes a check within the $.each loop:

(if(element.itemID || element.itemQuantity || element.itemPrice))

If any of these values are present in the element, they will be added to the array. You may customize this further as needed. I hope this information is helpful.

Answer №3

After some investigation, I managed to solve my queries. It turns out that the carted_prods variable was an array of JSON containing an element with a null value. This was causing issues when it reached the $.each() loop and resulted in a NaN. To address this issue, I implemented the following code to filter out elements without null or NaN:

jsonToSaveToDB = jsonToSaveToDB.filter(obj => !isNaN(obj.ProductID));
jsonToSaveToDB = jsonToSaveToDB.filter(obj => obj.ProductID != null)

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