Tag: javascript

How to work with JSON (JavaScript Object Notation)

In this article I will write about working with JSON. JSON stands for JavaScript Object Notation. It is a great way to send objects back and forth through client-server and also to create API’s that return JSON when information is requested. Lets look at an object in javascript.


var object = {
self : {name:"customer1",job:"cashier"},
todo :"jsonobject",
names : [{employ:"work",happy:true,work:"program"},
{employ:"job",happy:false,work:"intro"}]
};

This object, called object has a couple variables and an array names. Now lets see this object in JSON format.


{"self":{"name":"customer1","job":"cashier"},
"todo":"jsonobject",
"names":[{"employ":"work","happy":true,"work":"program"},
{"employ":"job","happy":false,"work":"intro"}]}

in javascript to turn an object into JSON you use the JSON.Stringify method

JSON.stringify(object);

And to turn JSON into and Object you use JSON.Parse method


var object = JSON.parse(json);

Now to work with JSON in php you can make objects in php and then use json_encode to turn the object into JSON like this


<?php $myObj = new \stdClass();
$myObj->name = "John";
$myObj->age = 30;
$myObj->city = "New York";
$myArray = array();
for($i = 0;$i < 10;$i++){
$myArray[$i] ="hello world".$i;
}
$myObj->hello = $myArray;
$myJSON = json_encode($myObj);
echo $myJSON;
?>

Now the variable $myJSON will look like this after you encode it


{"name":"John",
"age":30,
"city":"New York",
"hello":["hello world0","hello world1",
"hello world2","hello world3","hello world4",
"hello world5","hello world6","hello world7",
"hello world8","hello world9"]}

and if you are sending a JSON object to a php script using JSON.stringify you can grab the object in php with something like this using json-decode

$obj = json_decode($_POST["x"], false);

And that is pretty much the basics for using JSON in javascript and php. One note i was looking around and it appears that you are not supposed to send functions through JSON but there is a way that is not consistent so it shouldnt actually be done, as far as i know. I hope you enjoyed this article. Untill next time đŸ™‚

Dell 65W USB-C Laptop Charger for XPS and Latitude 5000 - Power Cord Included
4.6 out of 5 stars(1545)
$22.99 (as of November 19, 2024 02:53 GMT -05:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)
Amazon Fire HD 10 Kids Pro tablet (newest model) ages 6-12 | Bright 10.1" HD screen | Slim case for older kids, ad-free content, parental controls, 13-hr battery, 32 GB, Happy Day
4.6 out of 5 stars(3828)
$189.99 (as of November 19, 2024 02:53 GMT -05:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)
Amazon Fire HD 10 tablet (newest model) built for relaxation, 10.1" vibrant Full HD screen, octa-core processor, 3 GB RAM, 32 GB, Ocean
4.5 out of 5 stars(16463)
$139.99 (as of November 19, 2024 02:53 GMT -05:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)
Acer Aspire 3 A315-24P-R7VH Slim Laptop | 15.6" Full HD IPS Display | AMD Ryzen 3 7320U Quad-Core Processor | AMD Radeon Graphics | 8GB LPDDR5 | 128GB NVMe SSD | Wi-Fi 6 | Windows 11 Home in S Mode
4.4 out of 5 stars(39257)
$279.99 (as of November 19, 2024 02:53 GMT -05:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)
Amazon Fire HD 10 Kids Pro tablet (newest model) ages 6-12 | Bright 10.1" HD screen | Slim case for older kids, ad-free content, parental controls, 13-hr battery, 32 GB, Nebula
4.6 out of 5 stars(3828)
$189.99 (as of November 19, 2024 02:53 GMT -05:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)

A Cookie Helper object in JavaScript

This example is a little helper class to make and erase cookies in javascript. I will first post the Cookies.js script that will create, read, and erase cookies from your browser.

Cookies.js


/*
author: Copypasteearth 7/17/2017
*/

function COOKIE () {

this.createCookie = function (name,value,days) {
if (days) {
var date = new Date();
date.setTime(date.getTime()+(days*24*60*60*1000));
var expires = "; expires="+date.toGMTString();
}
else var expires = "";
document.cookie = name+"="+value+expires+"; path=/";
}
,
this.readCookie = function (name) {
var nameEQ = name + "=";
var ca = document.cookie.split(';');
for(var i=0;i < ca.length;i++) {
var c = ca[i];
while (c.charAt(0)==' ') c = c.substring(1,c.length);
if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
}
return null;
}
,
this.eraseCookie = function(name) {
this.createCookie(name,"",-1);
}
}

Then you just include this javascript in a webpage and create the object and then you can call the different functions as you will. Here is an example HTML file using it. This file just pretty much tests out the Cookies.js file.

index.html


<!DOCTYPE html>

<html lang="en">
<head>
<meta charset="utf-8" />
<title>profile</title>
</head>

<body>

<script src="Cookies.js"></script>
<h1>this is a test of Cookies</h1>
<h2 id = "cook"></h2>
<input id = "cookiename" type="text" placeholder="cookie name..."></input>
<input id = "cookievalue" type="text" placeholder="cookie value..."></input>
<input id = "days" type = "number" placeholder="number of days"></input>
<button onclick="buttonClick()">Create Cookie</button>
<br>
<input id = "getcookie" placeholder="cookie name"></input>
<button onclick="getCookie()">Read Cookie</button>
<br>
<input id = "erase" placeholder="cookie name"></input>
<button onclick="deleteCookie()">Erase Cookie</button>
<p id= "paragraph"></p>
<script>
var Cookie = new COOKIE();
function buttonClick(){
var name = document.getElementById("cookiename").value;
var value = document.getElementById("cookievalue").value;
var days = document.getElementById("days").value;
Cookie.createCookie(name,value,days);
document.getElementById("paragraph").innerText = "Cookie Created: " + name + "=" + value + ";" + days;
}
function getCookie(){
var name = document.getElementById("getcookie").value;
var cookie = Cookie.readCookie(name);
document.getElementById("paragraph").innerText = "Cookie Read: " + name + "=" + cookie;
}
function deleteCookie(){
var name = document.getElementById("erase").value;
Cookie.eraseCookie(name);
document.getElementById("paragraph").innerText = "Cookie Erased: " + name;
}
</script>
</body>

</html>

and that’s pretty much it for this article. Maybe you can get some use out of this. I hope you enjoyed this article.

Apple 2024 MacBook Pro Laptop with M4 chip with 10‑core CPU and 10‑core GPU: Built for Apple Intelligence, 14.2-inch Liquid Retina XDR Display, 16GB Unified Memory, 512GB SSD Storage; Space Black
5.0 out of 5 stars(4)
$1,567.19 (as of November 19, 2024 02:53 GMT -05:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)
Amazon Fire HD 10 tablet (newest model) built for relaxation, 10.1" vibrant Full HD screen, octa-core processor, 3 GB RAM, 32 GB, Black
4.5 out of 5 stars(16463)
$139.99 (as of November 19, 2024 02:53 GMT -05:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)
65W Surface Pro Laptop Charger for Microsoft Surface Pro 10, 9, 8, 7+, 7, 6, 5, 4, 3, X, Windows Surface Laptop 6, 5, 4, 3, 2, 1, Surface Go Tablet, Surface Book 3, 2, 1, Support 44W, 36W, LED, 10FT
4.6 out of 5 stars(2711)
$26.99 (as of November 19, 2024 02:53 GMT -05:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)
Charger for HP Laptop Computer 65W 45W Smart Blue Tip Power Adapter
4.6 out of 5 stars(2390)
$9.90 (as of November 19, 2024 02:53 GMT -05:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)
TP-Link Deco AX3000 WiFi 6 Mesh System(Deco X55) - Covers up to 6500 Sq.Ft. , Replaces Wireless Router and Extender, 3 Gigabit ports per unit, supports Ethernet Backhaul (3-pack)
4.5 out of 5 stars(11558)
$189.99 (as of November 19, 2024 02:53 GMT -05:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)
%d bloggers like this: