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AngularJS - how to read a local (resource?) JSON file

Posted on 2015-01-09
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Last Modified: 2015-01-12
Hi..
I need to read a local JSON file that contains mapping info.
What the correct/best way to read it?
Do I use HTTP GET?  or Resource?
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Question by:JElster
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10 Comments
 
LVL 25

Expert Comment

by:Kyle Hamilton
ID: 40541955
local on someone's computer through a web app? you cant with a web browser.

imagine the security nightmare if websites could have access to your computer's files!

you could have a button that loads the file, but the user would have to select the file.

if the question is about developing your app on your local computer, then in order to make ajax requests you would need to 'host' your app. in other words, you need a localhost, or virtual host on your computer to serve your app
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Expert Comment

by:Kyle Hamilton
ID: 40541959
you could also of course just reference the file in plain old script tag..
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Author Comment

by:JElster
ID: 40541987
It's a local mobile app
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LVL 25

Expert Comment

by:Kyle Hamilton
ID: 40541998
not sure what you mean by 'local'.

Does it run in the browser, or is there some kind of wrapper like phonegap?
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Author Comment

by:JElster
ID: 40542001
Just looking for code and suggestions...  uses cordova too..
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Assisted Solution

by:Kyle Hamilton
Kyle Hamilton earned 1000 total points
ID: 40542018
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Accepted Solution

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ambience earned 1000 total points
ID: 40544023
HTML5 has new API that lets you interact with local files. You can find dozens of examples, here are a few:

http://blog.teamtreehouse.com/reading-files-using-the-html5-filereader-api
http://www.html5rocks.com/en/tutorials/file/dndfiles/
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Author Comment

by:JElster
ID: 40544351
So how do I read a local JSON file without having to select it?
Something like this>

      var reader = new FileReader();

                  var file = 'data/myJSON.json'

                        reader.readAsDataURL(file);      


thx
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LVL 25

Expert Comment

by:Kyle Hamilton
ID: 40544366
You can't. You have to select it.
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LVL 22

Expert Comment

by:ambience
ID: 40544442
There is no standard way of reading a file in such a covert manner. The only way I can think of is to write an ActiveX control, which would also considerably limit the target OS and browsers.

You can however use webstorage and WebSQL (all new goodies that come with HTML5) and save content locally. This should however should only be treated as a caching mechanism and you cannot rely on the content to be always there.
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