json save to db and use it after - javascript

how to convert this json to database:
var obj = {
'one' : ['qq','rr'],
'pizda' : { }
}
and then retrive it and use it?

You could store it in mongodb without too much effort.
db.foo.save(obj); // Save obj to a database
db.foo.find(); // find it again.
You might want to give a bit more details.

Assuming that the database runs on the webserver and you thus need to pass the JSON as a string around between webserver and webbrowser, then the answer depends on the server side language you're using.
If you're using PHP, then you can convert between a JSON string and a PHP array using json_decode() and json_encode()
If you're using JSP/Java, then there are several libraries available to convert between a JSON string and a Java object, the popular ones being Google Gson, JSON.org and Jackson.
If you're using ASP/.NET, then there are several libraries available as well, under each Google JSONSharp.
Also see the bottom of this page for an overview of several JSON parsers/formatters in various languages.

Related

Passing a python list to Javascript list for Apexcharts

Im passing my python list to a html element and reading it with JS, but i get this error below.
var test = document.querySelector('#my_variable').value
document.write(test)
var options = {
series: [{
name: "Desktops",
data: test
When you move data between different programming languages, you use some kind of intermediary. When working with JavaScript, it's almost impossible to avoid using JSON, as that's it's native intermediary. You can use it in many more places, but that's beside the point.
Python also natively supports JSON with it's json module. You should convert any data you have to a Python dictionary or list, which you can then turn into a JSON string using the module.
You can then pass that string to the frontend, from where you can parse it with JavaScript's JSON, which should solve your problem, or at the very least get you closer to a solution.

Can I use SQL to store my Javascript objects?

I'm new to programming, and I have been programming a small project with vanilla javascript, but I was using a lot of document.getElementById() tags, and I stored all of these in a javascript object, on a seperate file, but I was wondering If I could Just store that object on a SQL file, to make my project more organized.
I'm not sure if that's possible, I know that SQL stores data, so would I be able to store my JS object on a sql file, and import that object into my seperate Javascript files?
I'm trying to make sure if I can do what I want to do before I decide to start learning sql, but If it does do what I need, I was going to start incorporating it for organization, so I can learn it as I create projects.
You can use the JSON.stringify function to convert your javascript objects into strings. However, it is important to note that the only items within the javascript object that are converted into strings are: objects, arrays, strings, numbers, and values that are: null, true, or false. If you have references to functions or classes that have been instantiated, then these will be lost. You can convert the string back into a javascript object using JSON.parse.
One thing to consider before you do this is whether or not you need to perform database queries on the data that you are storing within the javascript object. If you need to search on the javascript object's data, then you should store the information directly within tables in the database. If you don't need to search on it, then converting the data to a string and saving it should be fine to do. Since it sounds as though you are using the data for your own purposes, doing this should be fine since extracting all of the data from the database shouldn't be an intensive task. Also, you can write your own scripts to parse the data.
Definitely, you can store as a JSON Blob
https://learn.microsoft.com/en-us/sql/relational-databases/json/store-json-documents-in-sql-tables?view=sql-server-ver15

Transforming api json responses for NodeJS

I'm ending up having to do hacks to convert 'true' to just true and it's creating code smell.
Is there a library like https://github.com/thephpleague/fractal that allows me to transform my response into the types I need?
In cases like this it's almost always better to fix the API to return data in a usable format rather than trying to post-process the result on the client.
In your case there are several routes you could take:
Store the list as a JSON string directly in the database.
This means you don't have to do any processing on the server and can just return it 'as is'. However you lose the ability to do queries on the data directly and need to resort to things like LIKE and string operations.
Store the data relationally, and process it on the server to turn it into JSON
Here you retain the ability to do queries on your data, but you may need to do several queries to get all the data you need and then connect it on the server. (eg. you would do one SELECT on the user table to get a user, and then you would need to do another SELECT on the friends table where the userid matches your first user. You would then need to merge these results to create your JSON.) This is usually the best way to do it.
You can also turn the result into JSON directly inside the database engine using a user defined function. For example using https://github.com/mysqludf/lib_mysqludf_json#readme
This is somewhat similar to 2, but it ties your stored procs to the JSON format.

How to pass array of data from one webpage to the other?

i'm trying to send three arrays of data from one .js file which is used by first webpage to the other .js file which is used by the second webpage.
the data in the first webpage is dynamically built so those three arrays are to be sent to the next webpage.
can anyone suggest some javascript code or tutorial.
please help...............
Thank you Guys. . . . ..
I'd suggest using the JSON data format. JSON is like XML except a lot easier to parse through. Some great examples can be found on Jquery's page:
http://api.jquery.com/jQuery.getJSON/
Everything you need to read the JSON feed can be found on jQuery. If you need to know how to structure a JSON feed you can read about it here:
http://www.json.org/js.html
This is really tough to do with strictly javascript and html. Here are some options:
You could store the array in a hidden form variable and post it to the destination page
If the dataset is small enough (< 4K), then you can store it in a cookie across requests.
If you are only using the most modern browsers (read: HTML5), you can use localstorage
You could encode the data and pass it in the url
In general, though, these are mostly hacks. Usually this kind of work is augmented by some type of server-side processing (perl, php, asp.net, etc) in which you have available some kind of storage across requests (i.e. Session in asp.net).
You could use the Web Storage API, and include a polyfill to port the functionality for older browsers:
http://code.google.com/p/sessionstorage/
https://gist.github.com/350433
Both of these use window.name to provide a session-like state. This may or may not be secure enough for your needs.
From there, you can use the following code for all browsers:
// Store on previous page
sessionStorage.setItem("yourArray", JSON.stringify(yourArray));
// Restore on following page
var yourArray = JSON.parse(sessionStorage.getItem("yourArray"));
EDIT: Older browsers may need the following for the above code sample. This is so the array can be serialized to a string, since sessionStorage only supports string key-value pairs:
https://github.com/douglascrockford/JSON-js
Check out jQuery.data() and friends. Cf.: http://api.jquery.com/category/data/
You may use cookie for that purpose.

JSON in location.hash for AJAX(J) bookmarking?

I'm building an AJAJ (AJAX with JSON) webapp with jQuery and I'd like my users to be able to bookmark a page that saves all of their setting selections for a certain part of the app. I've got quite a bit of data that needs to be saved, so I thought JSON might be the best way to save this, putting it into the location.hash.
That being said, what's the best way to get the string of data from the location.hash and convert it back to a JSON object so that it's usable inside the Javascript?
Here's what I'm thinking as far as the JSON object
http://example.com/index.html#json={'s': '2010-02-19', 'array':[1,2,3,4]}
Roland suggested that I drop the json=, successfuly cutting 5 characters out, too. So the complete location would be:
http://example.com/index.html#{'s': '2010-02-19', 'array':[1,2,3,4]}
Example assuming you have JSON support (either native or by including a JSON parse script)
var obj, text = document.location.hash;
if (text){
obj = JSON.parse(text);
}
If the browser does not have native JSON support, you can grab a script from http://www.json.org/js.html or use some framework supported variant (like YUI's http://developer.yahoo.com/yui/json/)
You say 'quite a bit'. Can you be more specific? Bear in mind that you are limited to 2083 characters on your URL.
Personally, I would be reticent to store this sort of stuff in the command line anyway. You'll have pain dealing with URL encoding/decoding, and people can get an Idea of your data structures, and possibly hack the JSON string in the URL.
Have a look at the history plugin, it might be relevant to your needs

Categories