Using Eval To Parse A JSON Text

Jun 9, 2006

Can anyone explain me why you need to add open and close parenthesis to
a JSON text in order to use eval() to parse it?

For example:

var json = "{a: 'abc', b: 'def'}";
var obj1 = eval("(" + json + ")"); //ok!
var obj2 = eval(json); //syntax error!

why are parenthesis necessary?

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Why Is It Necessary To Eval Or Parse JSON Data

Sep 19, 2009

Why is it necessary to eval or parse JSON data?If it is legal JS, why couldn't I just name the file in the src attribute of a <script> statement?

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Jan 4, 2012

I am having difficulty displaying a specific key from a json file. I am trying to parse the following json file using query:

[URL]

I am using this type of function to parse the data:

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Using this I am able to print all the keys from the route but I am not able to print a specific key.

What I want to do is just get the results for the key "fuelUsed" using this method:

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The json response is

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[URL]

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I believe this one is valid JSON, but my attempts to parse it are always failing when I do it like this:

success:
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{
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function waitGoUpdate()
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var $jQ = jQuery.noConflict ();
$jQ.ajax ({

[Code].....

and just print out the function, than I would get the data on screen. now if I was to access my php file directly than that fill will output an error due to missing plugins.. I guess that is just how wordpress sorta work.. but again I do get the info that i need by just printing out the function. Do anyone knows a work around for this? I am kinda pulling my hairs out.

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Message: 'JSON' is undefined
Line: ###
Char: #
Code: 0
URI: http://...

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[Code]....

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<script type="text/javascript">

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<
html>
<

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[Code]...

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Eval() How Else

Jul 23, 2005

given that I have a js file included which is written programatically and I
can't change it. I would like to know how to do the following using
something other than the deprecated eval().

whats in the js file
var numArrays=something;
var data0 = new Array();
data0.name="name";
data0.data="some data";
var data1 = new Array();
data1.name="another name";
data1.data="some more data";
etc ....
function getData(arrayName) {
for ( var i=0;i<numArrays:i++) {
var el=eval('data'+i);
if (arrayName = = el.name) doSomething(el.data);
}}

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How To Use Eval?

Jul 23, 2005

var fns = ['orde', 'no', 'kml', 'snf', 'td', 'ty', 'tn', ...up to 21
elms...];
var snv = new Array();

var vals = new Array();
for (i = 0; i < N; i++) {
for (j = 0; j < fns.length; j++)
vals[j] = some value;
snv[i] = new makeData(vals);
}

function makeData(vals) {
for (k = 0; k < vals.length; k++)
//the following line doesn't work
eval("this."+fns[k]+"="+vals[k]);
//neither this one
this.eval(fns[k]) = vals[k]);
}

how can i make it without writing it the long way:

this.orde = vals[0];
this.no = vals[1];
this.kml = vals[2];

and so on?

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Need The [] In Eval

Nov 16, 2006

how comes the following doesnt work

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i believe it's because of the [] but i need to keep them!

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