How to Use JSON with Jquery

How to parse JSON data with jQuery / JavaScript?

Assuming your server side script doesn't set the proper Content-Type: application/json response header you will need to indicate to jQuery that this is JSON by using the dataType: 'json' parameter.

Then you could use the $.each() function to loop through the data:

$.ajax({ 
    type: 'GET', 
    url: 'http://example/functions.php', 
    data: { get_param: 'value' }, 
    dataType: 'json',
    success: function (data) { 
        $.each(data, function(index, element) {
            $('body').append($('<div>', {
                text: element.name
            }));
        });
    }
});

or use the $.getJSON method:

$.getJSON('/functions.php', { get_param: 'value' }, function(data) {
    $.each(data, function(index, element) {
        $('body').append($('<div>', {
            text: element.name
        }));
    });
});

Serializing to JSON in jQuery

JSON-js - JSON in JavaScript.

To convert an object to a string, use JSON.stringify:

var json_text = JSON.stringify(your_object, null, 2);

To convert a JSON string to object, use JSON.parse:

var your_object = JSON.parse(json_text);

It was recently recommended by John Resig:

...PLEASE start migrating
your JSON-using applications over to
Crockford's json2.js. It is fully
compatible with the ECMAScript 5
specification and gracefully degrades
if a native (faster!) implementation
exists.

In fact, I just landed a change in jQuery yesterday that utilizes the
JSON.parse method if it exists, now
that it has been completely specified.

I tend to trust what he says on JavaScript matters :)

All modern browsers (and many older ones which aren't ancient) support the JSON object natively. The current version of Crockford's JSON library will only define JSON.stringify and JSON.parse if they're not already defined, leaving any browser native implementation intact.

jQuery - How to PUT JSON via Ajax?

I think the data needs to be a String. Objects are converted to query strings which is what you are seeing here.

You can use the JSON.stringify(obj) method to convert your Object to a String. The code for the JSON object is available from: https://github.com/douglascrockford/JSON-js/blob/master/json2.js.

Alternately, just pass the code you are using to create the object as a literal String, but I imagine this is just an example and you'll want to encode some object you've already created.

Displaying JSON Data using jQuery

i feel you should stop the form submit:

$('form').on('submit', function(e) { // <-----add arg to get the event as e.
  e.preventDefault(); //<----add this to stop the form submission

  console.log("the form has beeen submitted");

  // grab values
  valueOne = $('input[name="perfid"]').val();
  valueTwo = $('input[name="hostname"]').val();
  valueThree = $('input[name="iteration"]').val();

  console.log(valueOne)
  console.log(valueTwo)
  console.log(valueThree)

  $.ajax({
    type: "POST",
    url: "/",
    datatype: 'json',
    data: {
      'first': valueOne,
      'second': valueTwo,
      'third': valueThree
    },
    success: function(data) { //<----this confused so change it to "data"
      var res = data.result.sectoutput.summarystats.Avg.Exempt;                 
      var p = '<p><pre>'+res+'</pre></p>';
      $('#result').append(p); // now append the Exempts here.
    },
    error: function(error) {
      console.log(error)
    }
  });
});

---

Because if you don't then form will submit and page gets refreshed and the data from ajax won't be reflected.

---

Updates:

I guess the actual problem lies here:

    success: function(data) { //<----this confused so change it to "data"
      var res = data.result.sectoutput.summarystats.Avg.Exempt;                 
      var p = '<p><pre>'+res+'</pre></p>';
      $('#result').append(p); // now append the Exempts here.
    },

The most confusing part in the code was the usage of result key. Better to have a different name in the success callback as i used data which is denoting the response data from ajax which is an object. So we just need to target it like:

var res = data.result.sectoutput.summarystats.Avg.Exempt;   

How do I get JSON data from an external file in jQuery and ensure the data is loaded before the remainder of the script

see documentation on getJson

if you want it should run and other section should wait, you can set 'asysn' : false
but it is not a good idea, since the code after the ajax will wait until it completes.

OR

// check the meaning of done, fail, always
    $.getJSON( "url", function() {
    
    }).done(function(){
    
        // your rest of the code
        
    });

or you may try custom trigger event

$(function(){

    $.getJSON( "url", function() {

    }).done(function(){
        $( document ).trigger( "jsonSuccess", [ "bim", "baz" ] );
    });

    $( document ).on( "jsonSuccess",function(event, var1, var2){
        // will execute after the 'getJSON' success 
    });
    
    // other codes can be execute from here, it will not wait

});

How to read data from json format using jquery

Use var Data = $.parseJSON(response);

Example

var obj = jQuery.parseJSON( '{ "name": "John" }' );
alert( obj.name === "John" );

JSON.stringify turns a Javascript object into JSON text and stores that JSON text in a string.

JSON.parse turns a string of JSON text into a Javascript object.

How to access JSON object

FYI, as of jQuery 3.0, $.parseJSON is deprecated. To parse JSON objects, use the native JSON.parse method instead.

var json = [      { 'red': '#f00' },     { 'green': '#0f0' },     { 'blue': '#00f' }];$.each(json, function () {  $.each(this, function (name, value) {    console.log(name + '=' + value);  });});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

Trying to load local JSON file to show data in a html page using JQuery

As the jQuery API says: "Load JSON-encoded data from the server using a GET HTTP request."

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

So you cannot load a local file with that function. But as you browse the web then you will see that loading a file from filesystem is really difficult in javascript as the following thread says:

Local file access with javascript

How to retrieve data from JSON file using Jquery and ajax?

your code is corect, you must move your code to server, on server your ajax call json, all will be work.

How can I use JQuery to post JSON data?

You're passing an object, not a JSON string. When you pass an object, jQuery uses $.param to serialize the object into name-value pairs.

If you pass the data as a string, it won't be serialized:

$.ajax({
    type: 'POST',
    url: '/form/',
    data: '{"name":"jonas"}', // or JSON.stringify ({name: 'jonas'}),
    success: function(data) { alert('data: ' + data); },
    contentType: "application/json",
    dataType: 'json'
});

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