how to convert json/array from ajax responseText in to javascript array?

Question

I have used ajax in the code which works perfectly and give me json or array which ever I want as an output. the code I have used is,

xmlhttp=new XMLHttpRequest();
xmlhttp.open("GET","http://map_ajax_control.php",false);
xmlhttp.send();

var test = xmlhttp.responseText;
alert(test);

This test variable gives me json/array.

I want to get the data which I received in the test variable in the JavaScript array.

The question is, how can I decode json data in javascript array? I have used the code as,

var output = new Array();  
output = json_decode(xmlhttp.responseText);

but this code is not giving me any output.
How can I do this two things?

Weighing down a web app with the entire jQuery library would be overkill if all this requires is logic for a json ajax handler — Darius
– Darius, Commented Sep 13, 2014 at 12:13

Sudhir Bastakoti · Accepted Answer · 2012-01-31 05:26:34Z

33

Most browsers support JSON.parse(). Its usage is simple:


obj = JSON.parse(xmlhttp.responseText);
alert(obj.length);

For the browsers that don't you can implement it using json2.js.

answered Jan 31, 2012 at 5:26

Sudhir Bastakoti

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1 Comment

Arpi Patel Over a year ago

i have used this also.But its not working.It is not giving me any output

admdrew · Accepted Answer · 2014-10-28 14:46:54Z

17

Try this:

var arr = xmlhttp.responseText.Split(',');

If it does not solve your problem then in your php code, use simple json_encode(your array); and on javascript, use myData= eval("(" + xmlHttp.responseText + ")"); .

I suggest you to follow this approach:

Encode the data you want to send by using a PHP binding for JSON at the server and decode the same using Javascript library for JSON. as:

var myObject = eval('(' + myJSONtext + ')');

or

var myObject = JSON.parse(myJSONtext, reviver);

Note: Include json2 javascript file to your solution..

Problem with storing values in Array from php to AJAX

edited Oct 28, 2014 at 14:46

admdrew

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answered Jan 31, 2012 at 5:32

Niranjan Singh

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2 Comments

Allen Over a year ago

Absolutely! I was getting a responseText object instead of a simple type. Using this approach ( and knowing a little about the object), I can extract the field d which is the boolean I cared about in this case.

T0m Over a year ago

WTH, PLEASE do not use the eval option of decoding the json, it is a blatant xss vulnerability

Jashwant · Accepted Answer · 2012-01-31 05:32:14Z

2

json is nothing but javascript object notation. You just need to parse it as suggested by Sudhir. You can also use jQuery.parseJSON for it.

And to do ajax, I strongly suggest you to use some library, preferably jQuery.

http://api.jquery.com/jQuery.ajax/

answered Jan 31, 2012 at 5:32

Jashwant

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