What is the best way to display the size of this JSON Object?

Struggling to output the length of this JSON Object on the console, but all I get is 'undefined'.

This JSON data is encoded in PHP and then sent back via ajax to an unnamed function as 'msg'

{"1":{"item_id":"shirt_straight--small","quantity":5},"2":{"item_id":"shirt_straight--medium","quantity":"2"}}

When trying to print to the console:

console.log(msg.length); //undefined
console.log(msg[1].item_id); //shirt_straight--small

I can access the value of msg[1].item_id but getting the object's length through msg.length remains elusive.

Your assistance is much appreciated!

Answer №1

When it comes to arrays and objects, there is a difference in how the `length` property is handled. Arrays have a built-in `length` property while Objects do not have one by default. One way to solve this issue could be encoding the array on the PHP side before sending it back. Remember, arrays are zero-indexed, so that might be causing the problem. One possible solution could be using `json_encode(array_values($msg))`.

If you are confident that your keys are correct, try using `Object.keys(msg).length` for verification.

Answer №2

This post may serve as a copy of Measuring the size of a JavaScript object.

Take a look at the answer that has been accepted.

Incidentally, I stumbled upon it by searching for "size of javascript object" ;)

UPDATE:

While objects do not possess a size property, you can determine the size using Object.keys(foobar).length, although this method is not compatible with IE8 (https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/keys)

Similar questions

If you have not found the answer to your question or you are interested in this topic, then look at other similar questions below or use the search

IE11 is encountering an error with an "Expected identifier" message in the vendor.js file related to Webpack's variable

I encountered an issue with an Expected identifier ERROR code: SCRIPT1010 that is pointing to vendor.js in the WEBPACK VAR INJECTION section. The debugger is highlighting the line with: const { keccak256, keccak256s } = __webpack_require__(/*! ./hash */ ...

Using JavaScript to call a PHP file as the source file

I'm curious about the scenario where a .php file is called as a javascript. What does this signify and in what situations would it be necessary to use such an approach? Example: <head> <script src="dir/myphpfile.php" type="text/javascript" ...

Determining the current month of the user when utilizing the v-calender

Struggling with my v-calendar plugin on a website, I need to determine the month and year that the user is currently viewing to implement some specific changes. How can I access this information as the user moves through the calendar? https://i.sstatic.ne ...

Angular 8 project experiencing issues with Bootstrap dropdown functionality

I have successfully installed the packages listed below: npm install --save bootstrap@3 npm install --save popper.js angular-popper npm install jquery --save Afterwards, I included the styles and scripts in the angular.json file in the exact order as sho ...

Tips for automatically choosing several choices from a multiple-select using Chosen.JS

I am struggling to programmatically select multiple values in a multiple select using chosenJS/chosen.js while still ensuring that the selected values are bound to my ng-model (angularJS). In this scenario, I have a list of users, some of whom are already ...

The Slim 3 framework encountered a JWT 401 error, indicating that the request was

Starting out with the slim 3 framework skeleton project for the first time, I was told: If you prefer having a quick-start sample application ready to go, there is a skeleton project available. Use that if you don't want to dive deep into how every ...

What is the mechanism behind JQuery Ajax?

Currently, I am attempting to utilize JQuery Ajax to send data to a Generic Handler for calculation and result retrieval. Within my JQuery script, the Ajax request is contained within a for loop. The structure of the code resembles the following: function ...

Query in SQL to retrieve numbers that are multiples of a specified value

To create a candlestick graph, I need to convert the following table: amount created_at updated_at 258 2019-10-17 01:45:17 2019-10-17 01:45:17 186 2019-10-17 01:45:17 2019-10-17 01:45:17 122 2019-10-17 01:46:31 2019-1 ...

What is the correct way to specify a property for a Type within a function component? Issue TS2339 encountered

Looking at the code provided below, we can see an implementation in React that works well in JS/JSX but encounters errors when using TypeScript. import React, { useContext, useReducer, useEffect, } from 'react'; const AppContext = React.createC ...

Module cannot be resolved within react-viro

Having some issues running this application and receiving an error message. View the app code on GitHub here: https://github.com/vnovick/pile-blocks-ar I have followed the asset import instructions outlined here: . Despite following the steps correctly, I ...

What is the method to reach the DOM element of a different component in Angular?

My application is structured as follows: <nav></nav> <router-outlet></router-outlet> <footer></footer> Within the router-outlet, I have various components depending on the route. On some of these pages, I need to acces ...

Leverage AJAX data to dynamically generate an input field within a Laravel application

. Hey everyone, I'm currently working on implementing ajax for a search functionality. The goal is to display links to the search results' pages along with checkboxes next to each result, allowing users to select orders for printing. Although I ...

retrieving request headers using XMLHttpRequest

Is there a way for me to access my requestHeaders within the onload function? Any guidance on how to achieve this would be greatly appreciated. Many thanks! ...

How to extract a list from a dictionary using Python and a JSON file

I'm brand new to Python and could really use some guidance. My goal is to utilize Python to extract the values of a list within a dictionary from my JSON file. After successfully reading the JSON data into my program, I have: request body = { " ...

Using Flask to send JSON data to the client and then redirect with make_request

I have created a callback URL with a redirection feature: @spotify_auth_bp.route("/callback", methods=['GET', 'POST']) def spotify_callback(): SPOTIFY_TOKEN_URL = "https://accounts.spotify.com/api/token" CLIENT_ID = os.enviro ...

Unraveling the intricacies of a website template downloaded alongside a webpack ES6 project

My colleague in the office was adamant about purchasing a stunning HTML/CSS/JS external template to serve as a foundational design for our website project. This particular website is a significant endeavor that we are constructing using Laravel, SASS, and ...

My messages are falling on deaf ears as the Discord bot remains unresponsive (js)

After creating a Discord bot using node.js and VS Code, I am encountering an issue where the bot appears online but does not respond to messages. Despite ensuring that the bot has all the necessary permissions, I cannot identify the root cause of this prob ...

Failed deployment of a Node.js and Express app with TypeScript on Vercel due to errors

I'm having trouble deploying a Nodejs, Express.js with Typescript app on Vercel. Every time I try, I get an error message saying "404: NOT_FOUND". My index.ts file is located inside my src folder. Can anyone guide me on the correct way to deploy this? ...

I'm in the process of developing a React application that will display live sensor data in graph form

My current project involves building a react app that visualizes real-time data from IoT sensors, including temperature, humidity, and pressure. I want the app to store this data so users can log in at any time to view specific information based on time, d ...

Transmitting special characters like umlauts through JSON using HTTPRequest

I am encountering a challenge in sending a JSON string via POST to a web service hosted on Azure within my Xamarin Forms application. While the JSON communication with the server is functional, I am facing difficulties specifically with umlaut characters. ...