如何使用Javascript覆盖我的甾体js应用程序中的本地JSON文件？

Question

I'm building a steroids js app and it uses data from a local json file in the www/data folder under "MyApp.json" to display things like a thumbnail image, a description etc. I want to overwrite this information upon launch of my application each time with JSON data from my server using JOSNP. I just need to know if it's possible for me to overwrite my local JSON file each time my app launches with the JSON data from my server. If so, how would I go about overwriting this file and would it work across platforms (ios, android, windows)?

Answer 1

If I understand right, you want a offline mode with online sync.

Best thing to do for you is to store in localStorage your javascript object

// json to storage 
localStorage.myList = JSON.stringify( list );
// storage to json
var list = JSON.parse( localStorage.myList );

The mozilla foundation have just released this weak a framework that handle different kind of online storage (asynchrounous db) :

https://github.com/mozilla/localForage 

You can on each load call a refresh function that get the data from the server and store it in local, if the app is offline, directly run the script from the local database

Answer 2

2this is not possible with client side javascripts, you need some sort of backend for this applicaiton - i mean a PHP script, that can change the JSON file or nodejs script.

The easiest idea is to make a PHP script and name if jsondata.php

something like it

if($_POST['data']){
  $handle = fopen('data.json', 'a');
  fwrite($handle, $_POST['data'])
  fclose($handle);
} else {
 readfile('data.json');
}

When you issue a GET call to this script, the data is given When you issue the POST call to this script, the data is saved

Sorry, i haven't wrote scripts on PHP for about two years, so this script is lame, but i hope you got the idea