From a DOMString to an array

Question

I'm new with javascript. I want to know if there is a possibility to convert a DOMString (taken by reading a file saved in the Filesystem) and converting it into an Array, since I need it to perform an operation. I'm using e.target.result to read the content of the file, and the result is

{element: "one", value: "one"},
{element: "two", value: "two"},
{...},
{...}

and I need the array saved in this way

var array = [{element: "one", value: "one"},
            {element: "two", value: "two"},
            {...},
            {...}]

any Idea how to do it? Thanks in advance

Could you please add how exactly does the input you have, look? — mavrosxristoforos, Oct 22 '13 at 18:59
Exactly the output of the reading, that should be also the input for the array is `[{element: "one", value: "one"}, {element: "two", value: "two"}, {...}, {...}]` I've tryed to simply assign it to an array variable but it doesn't work — user2908435, Oct 22 '13 at 19:13

score 0 · Answer 1 · answered Oct 22 '13 at 18:51

0

you might give the split() function a try.

var prearray = '{element: "one", value: "one"},{element: "two", value: "two"}';
var realarray = prearray.split(",");

http://www.w3schools.com/jsref/jsref_split.asp

answered Oct 22 '13 at 18:51

fkaefer

16
2

`string.split(',')` will also split `element` and `value` into their own arrays. – Kyle Muir Oct 22 '13 at 19:02
I have tried with String.split(',') but as said, it splits the first array in 2 array – user2908435 Oct 22 '13 at 19:15

score 0 · Answer 2 · edited May 23 '17 at 11:50

0

You can use eval to do this for you:

var array = eval("["+item+"]");
array[0].element //"one"
array[0].value //"one"
array[1].element //"two"
array[1].value //"two"

Fiddle: http://jsfiddle.net/KyleMuir/NZwAx/

Warning, eval can be extremely dangerous (code injection if from a third party, notoriously hard to debug if anything more complex than this example and also can have performance issues): https://stackoverflow.com/a/198031/2469255 so ensure you trust the source of the data that you are eval'ing

Hope this helps!

edited May 23 '17 at 11:50

Community

1
1

answered Oct 22 '13 at 22:53

Kyle Muir

3,875
2
22
27

It's a great idea. the only problem is that now, when I try to execute it, also adding `"content_security_policy": "script-src 'self' 'unsafe-eval'; object-src 'self'"` in the manifest file, an error occours: **Refused to evaluate a string as JavaScript because 'unsafe-eval' is not an allowed source of script in the following Content Security Policy directive: "default-src 'self' chrome-extension-resource:". Note that 'script-src' was not explicitly set, so 'default-src' is used as a fallback.** – user2908435 Oct 23 '13 at 16:15
In that case, writing a custom parser looks to be your best option. – Kyle Muir Oct 23 '13 at 17:47

From a DOMString to an array

2 Answers2