jQuery.getJSON - assign the data parameter to variable?

Question

I cannot assign the data parameter of the jQuery.getJSON function to variable.

var storage;

$.getJSON('server.json', function(data) {
    storage = data;
});

console.log(storage);

EDIT : ok I understand, so let's say the 'storage' variable is equals the server.json file, but i can't use it because the lines of code below the $.getJSON executed before the server answered, so how can i check whenever the server is answered?

Think about this piece of code for a while. Why would $.getJSON have the additional complexity of using a callback if it ran synchronously...? — Matti Virkkunen
– Matti Virkkunen, Commented Jan 2, 2013 at 12:57
@MattiVirkkunen but how can i still assign the JSON file to variable?? — julian
– julian, Commented Jan 2, 2013 at 12:59

Hugo LOPEZ · Accepted Answer · 2018-02-02 10:15:48Z

3

By "after that", you mean "below in the code", I suppose.

If so, then it's not after the server answered.

Use this :

var storage;
$.getJSON('server.json', function(data) {
    storage = data;
    console.log(storage);
});

The callback you give to getJSON is called after the server has (asynchronously) answered. That's where you must handle the result. The lines of code just below $.getJSON(...); are executed before the server answered so they can't use the result.

edited Feb 2, 2018 at 10:15

Hugo LOPEZ

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answered Jan 2, 2013 at 12:56

Denys Séguret

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4 Comments

Matti Virkkunen Over a year ago

@Israel: You can't do that. That's not how the event/callback driven model JS is based on works.

Denys Séguret Over a year ago

@IsraelG. You must understand what it means for a query to be asynchronous. A javascript application is event-driven (events being the response of a server or a user interaction). You must understand this point. You can't simply have a synchronous code.

julian Over a year ago

@dystroy ok I understand, so let's say the 'storage' variable is equals the server.json file, but i can't use it because the lines of code below the $.getJSON executed before the server answered, so how can i check whenever the server is answered?

mike Over a year ago

@IsraelG. You can call your method in the $.getJSON() where the data is defined. Then your method will have access to the right data when it arrives. Thats asynchronous callback style

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