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new here and hit a roadblock, been searching but can't find the answer with my skill set. Task is pretty simple, I want to parse this http://data.sparkfun.com/output/AJ2p4r8Owvt1MyV8q9MV.json which is from a weather station. I have used the W3C tutorial but just can't seem to parse this file, but http://json.parser.online.fr has no problem. All the looping parse examples just give me alert after alert.

All I want is the ability to select temp[0] (out of god knows how many) for example via javascript and have it display on a website. I'm really lost, tried searching and if I've missed the goldmine then my bad. Thanks!

Example code 

var text = '[{"humidity":"42.8000","stationtime":"2014-07-06 19:43:52","temp":"23.3000","timestamp":"2014-07-06T09:44:07.918Z"},{"humidity":"‌​43.0000","stationtime":"2014-07-06 19:42:57","temp":"23.2000","timestamp":"2014-07-06T09:42:22.003Z"},{"humidity":"‌​43.2000","stationtime":"2014-07-06 19:42:36","temp":"23.3000","timestamp":"2014-07-06T09:42:51.737Z"}]';  
var obj = JSON.parse(text); 
document.getElementById("demo").innerHTML = obj.temp[0];
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6
  • Example of what I'm trying to do <html> <body> <p id="demo"></p> <script> var text = '[{"humidity":"42.8000","stationtime":"2014-07-06 19:43:52","temp":"23.3000","timestamp":"2014-07-06T09:44:07.918Z"},{"humidity":"43.0000","stationtime":"2014-07-06 19:42:57","temp":"23.2000","timestamp":"2014-07-06T09:42:22.003Z"},{"humidity":"43.2000","stationtime":"2014-07-06 19:42:36","temp":"23.3000","timestamp":"2014-07-06T09:42:51.737Z"}]'; obj = JSON.parse(text); document.getElementById("demo").innerHTML = obj.temp[0]; </script> </body> </html> Commented Jul 6, 2014 at 11:32
  • do NOT post code in comments. Add it to the question Commented Jul 6, 2014 at 11:33
  • remove single quote from var text = '[{"humidity":"4 ..' Commented Jul 6, 2014 at 11:33
  • You should edit your question to say 'how to parse json', and not 'jsonp' as these are two different things (jsonp is a method of bypassing cross-origin restrictions). Commented Jul 6, 2014 at 11:36
  • But he needs JSONP to get at the JSON Commented Jul 6, 2014 at 11:37

2 Answers 2

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2

First, you need to parse the incoming string as below:

temp_arr = JSON.parse(json_string);

Just loop over the temp_arr array, and in each iteration of loop you'll have one object (tobj). For example, like this:

{"humidity":"40.9000","stationtime":"2014-07-06 21:21:03","temp":"22.6000","timestamp":"2014-07-06T11:20:27.231Z"}

All you have to do is, access it like tobj.temp and use it to display on page.

I have written a jquery implementation at: http://jsfiddle.net/DNH5n/2/

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3 Comments

Hi Rajesh, thanks for the reply! Any chance you could help me with the code, putting a working example together? My knowledge is limited with Java.
this is not Java, but javascript. Both are VERY DIFFERENT.
I took a look at the jsfiddle and definitely useful for me, I'm working on charts now and think this will help a lot. Thanks!
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Jquery makes working with JSONP much easier heres an example (http://jsfiddle.net/icodeforlove/9mBsr/)

$.getJSON('http://data.sparkfun.com/output/AJ2p4r8Owvt1MyV8q9MV.json?callback=?', function (data) {
    data.forEach(function (item) {
        $('body').append(JSON.stringify(item)); 
    });
})

update again

heres another example using your code (http://jsfiddle.net/icodeforlove/9mBsr/2/)

var text = '[{"humidity":"42.8000","stationtime":"2014-07-06 19:43:52","temp":"23.3000","timestamp":"2014-07-06T09:44:07.918Z"},{"humidity":"‌43.0000","stationtime":"2014-07-06 19:42:57","temp":"23.2000","timestamp":"2014-07-06T09:42:22.003Z"},{"humidity":"‌43.2000","stationtime":"2014-07-06 19:42:36","temp":"23.3000","timestamp":"2014-07-06T09:42:51.737Z"}]';

var obj = JSON.parse(text);

document.getElementById("demo").innerHTML = obj[0].temp;
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4 Comments

Thanks Chad! So very close to what I'm after, what would I have to change in order to select just one of the temps for example? Using some kind of obj.temp[1] I'm assuiming?
your problem is that there is no obj.temp, its just obj[1], try pasting your JSON into the console wrapped in ( ). It makes it much easier to see the contents of the JSON object. (img42.com/sQVtD+ - chrome console)
Thanks Chad, that's a real bummer. So there is no easy way using the original $.getJSON method to extract the temperature from the first object? Must be close.
Brilliant! One last thing is how can I use data.sparkfun.com/output/AJ2p4r8Owvt1MyV8q9MV.json?callback=? with that second example, the var text one? As I need the page to grab the values and update automatically. Really appreciate your help, seriously got me out of a bind.

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