How to get only 1st element of JSON data?

How to get only 1st element of JSON data? - javascript

I want to fetch only 1st element of json array
my json data :
{
id:"1",
price:"130000.0",
user:55,
}
{
id:"2",
price:"140000.0",
user:55,
}
i want to access the price of 1st json element
price : "13000.0"
my code
$.each(data_obj, function(index, element) {
$('#price').append(element.price[0]);
});
but my output
is '1'

Assuming that you have array of objects
var arr = [{
id:"1",
price:"130000.0",
user:55,
},
{
id:"2",
price:"140000.0",
user:55,
}]
console.log(arr[0].price)
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

You data isn't valid JSON, JSON data key must be wrap within double quote, but your data isn't wrapped in double quote
var data = [{
"id":"1",
"price":"130000.0",
"user":55
},{
"id":"2",
"price":"140000.0",
"user":55
}]
console.log(data[0]["price"]);

Hello You just need to add [] from starting and ending point of your json string. see here var data = JSON.parse( '[{ "id":"1","price":"130000.0","user":55},{"id":"2","price":"140000.0","user":55}]');
var priceValue = 0;
$.each(data, function(index, element) {if(index == 0){ priceValue = element.price;}});console.log(priceValue);
Your answer will be 13000.0

The element having the your JSON data means, we can able to use below code to get the first JSON data.
element[0].price
Thanks,

You are using for each loop and in function you get 2 params first one is index and second is the element itself. So this will iterate through all elements.
$.each(data_obj, function(index, element) {
$('#price').append(element.price);
});
If you just want to get first element
$('#price').append(data_obj[0].price);

var my_first_json_obj = data_obj[0]; // Your first JSON obj (if it's an array of json object)
var my_price = my_first_json_obj.price; // Your price
$('#price').append(my_price);

If you want only the first item's price, you don't need a loop here.
$('#price').append(data_obj[0].price);
would work here.
For further reading you can refer here

Following is the solution worked for my problem
I use return false;
$.each(data_obj, function(index, element) {
$('#price').append(element.price[0]);
return false;
});
Which gives only 1st value of array elements.

Related

getJSON data add array item to variable

I am using this script to retrive JSON data from a file to my page.
$.getJSON('json/data.json', function(data) {
$('#getJSON-results').html(JSON.stringify(data));
});
<div id="getJSON-results"></div>
Right now it jsut displays all the data from JSON file as a string on the page.
How would I take the data from my JSON file and place each array into a variable? My data in the JSON file looks like this:
[{"target": "summarize(first, \"1d\", \"sum\")", "datapoints": [[38.393148148148143, 1423958400], [90.800555555555633, 1424044800], [159.06037037037032, 1424131200], [245.5933333333335, 1424217600], [126.94796296296299, 1424304000], [120.37111111111113, 1424390400], [103.04148148148151, 1424476800], [99.273796296296368, 1424563200], [89.38203703703708, 1424649600], [92.970462962963012, 1424736000], [105.62666666666664, 1424822400], [110.33962962962967, 1424908800], [118.54981481481482, 1424995200], [100.08018518518523, 1425081600], [92.52277777777779, 1425168000], [98.647619047618974, 1425254400], [94.585000000000008, 1425340800], [85.568796296296284, 1425427200], [157.82222222222222, 1425513600], [109.7596296296296, 1425600000], [112.53324074074077, 1425686400], [89.392592592592649, 1425772800], [97.253518518518518, 1425859200], [73.424629629629635, 1425945600], [92.377592592592578, 1426032000], [76.117870370370397, 1426118400], [77.83953703703699, 1426204800], [66.643518518518533, 1426291200], [63.748055555555531, 1426377600], [137.30018518518517, 1426464000], [53.480648148148134, 1426550400]]},
{"target": "summarize(second, \"1d\", \"sum\")", "datapoints": [[2.7291600529100535, 1423958400], [5.7797089947089892, 1424044800], [3.4261574074074059, 1424131200], [5.0516335978835958, 1424217600], [6.2272420634920582, 1424304000], [11.752605820105822, 1424390400], [7.8688624338624269, 1424476800], [5.7305555555555525, 1424563200], [5.2784391534391499, 1424649600], [6.4652380952380897, 1424736000], [4.7690277777777741, 1424822400], [4.1451587301587258, 1424908800], [8.4178902116402039, 1424995200], [4.7948611111111061, 1425081600], [4.8153835978835939, 1425168000], [5.3873148148148111, 1425254400], [7.2819378306878262, 1425340800], [5.2084391534391488, 1425427200], [8.098492063492051, 1425513600], [5.6563822751322697, 1425600000], [5.3091468253968195, 1425686400], [4.7850396825396793, 1425772800], [3.8716931216931179, 1425859200], [3.1934325396825369, 1425945600], [3.2083531746031722, 1426032000], [3.3434391534391512, 1426118400], [3.6162235449735438, 1426204800], [3.2094179894179891, 1426291200], [2.3699537037037026, 1426377600], [4.3973544973544945, 1426464000], [2.1901388888888893, 1426550400]]},
{"target": "summarize(third, \"1d\", \"sum\")", "datapoints": [[5.3710185185185182, 1423958400], [11.25367724867724, 1424044800], [8.2990079365079268, 1424131200], [8.710694444444437, 1424217600], [9.6381216931216898, 1424304000], [9.3845105820105807, 1424390400], [9.7305820105820047, 1424476800], [8.6268055555555474, 1424563200], [10.589166666666673, 1424649600], [10.235462962962957, 1424736000], [10.455892857142853, 1424822400], [14.282407407407405, 1424908800], [17.774404761904758, 1424995200], [18.154120370370364, 1425081600], [16.249543650793651, 1425168000], [15.29764550264551, 1425254400], [16.267671957671972, 1425340800], [20.121488095238096, 1425427200], [27.007685185185196, 1425513600], [17.577962962962971, 1425600000], [17.020873015873018, 1425686400], [14.627685185185191, 1425772800], [15.824821428571433, 1425859200], [11.837579365079364, 1425945600], [13.292539682539683, 1426032000], [12.064074074074073, 1426118400], [12.279457671957676, 1426204800], [9.3799074074073978, 1426291200], [7.8777314814814732, 1426377600], [13.161825396825407, 1426464000], [7.2587499999999956, 1426550400]]}]
I am new to using JSON and would also appreciate any advice on the approach I'm taking.
How can I now make this data accsessable outside the getJSON?
$.getJSON('json/data.json', function(data) {
yourData = data;
makeMeGlobal = yourData[0];
});
console.log(makeMeGlobal.datapoints);

Changing your function to the following will result in an object you can then reference normally:
$.getJSON('json/data.json', function(data) {
yourData = data;
});
You could then get the first set of datapoints like this:
yourData.datapoints[0]

Should be:
data.forEach(function (obj) {
// obj now has each JSON object in this array
var test = obj.target;
}
When you get a JSON from AJAX, it's already ready for use in the browser. This is one of the nice perks of using JSON over XML.

It's already an array, because the original JSON string was parsed by jQuery. If you use stringify, you will get a string which contains the JSON representing the array (not useful for your purposes, as it's the same string returned by the server).
For example:
$.getJSON('json/data.json', function(data) {
// Here, data is already an array.
var data_length = data.length;
for (var i = 0; i < data_length; i++) {
var obj = data[i]; // Here we have an object from the array
alert("I have an object which target is " + obj.target);
}
});

You need to iterate through json to retrieve the value you need and append the html.More infor # https://stackoverflow.com/a/18238241/909535 Something like this
`$.getJSON('json/data.json', function(data){
data.forEach(
function(val, index, array) {
//val.target will have target attribute's value
//val.datapoints is a array which you can iterate
}
);
}
);`

JQuery Datatables Row Data From AJAX Source

In the past I've always used this to get a hidden column's data. I would hide the column with a css class, but the responsive feature doesn't work well with these.
var td = $('td', this);
var ID = $(td[0]).text();
So I found an alternative, by hiding the columns with these classes with the responsive feature.
"columnDefs": [
//Responsive classes
{ className: 'never', targets: 0 }, //Hide on all devices
{ className: 'all', targets: 1 }, //Show on all devices
]
and then I use either one of these.
var rowData = oTable1.fnGetData(this);
var rowData = oTable1.api().row(this).data();
//Grab the first indexed item in the list
var ID = rowData[0];
That works well if you don't have an AJAX source. It will return a comma separated list of the row data. However, when I try to use this with an AJAX source I just get [object Object] back (instead of a comma separated list) if I output the rowData variable in an alert.
How do I get the row data out of a table with an AJAX source?

It seem to be stored as string so [1, 2, 3] became [object Object] when you turn it into string. Do yourString = yourList.join(',') and store yourString to keep the coma-separated string.
For an object:
yourString = (function () {
var list = [];
for(var i in yourList)
if(yourList.hasOwnProperty(i))
list.push(yourList[i]);
return list.join(',');
})();
The function is not needed, it's just to limit the variables scope.

I ended up using an answer I found here.
Converting a JS object to an array
I can pull the entire row data from the table with this.
var rowData = oTable1.api().row(this).data();
In the console log I can see that it returns a javascript object like this.
Object { id="123456", full_name="Samuel Smith", Last_name="Smith" }
I use this function to convert the object into an array.
var array = $.map(rowData, function (value, index) {
return [value];
});
In the console log, my array would appear like this.
["123456", "Samuel Smith", "Smith"]
I can then extract any item from the array like this.
alert(array[0]);

Simplifying madvora's example:
var rowData = oTable1.api().row(this).data().to$();
rowDataArray = rowData.toArray();

How to push new key/value pair into external json file? [duplicate]

I have a JSON format object I read from a JSON file that I have in a variable called teamJSON, that looks like this:
{"theTeam":[{"teamId":"1","status":"pending"},{"teamId":"2","status":"member"},{"teamId":"3","status":"member"}]}
I want to add a new item to the array, such as
{"teamId":"4","status":"pending"}
to end up with
{"theTeam":[{"teamId":"1","status":"pending"},{"teamId":"2","status":"member"},{"teamId":"3","status":"member"},{"teamId":"4","status":"pending"}]}
before writing back to the file. What is a good way to add to the new element? I got close but all the double quotes were escaped. I have looked for a good answer on SO but none quite cover this case. Any help is appreciated.

JSON is just a notation; to make the change you want parse it so you can apply the changes to a native JavaScript Object, then stringify back to JSON
var jsonStr = '{"theTeam":[{"teamId":"1","status":"pending"},{"teamId":"2","status":"member"},{"teamId":"3","status":"member"}]}';
var obj = JSON.parse(jsonStr);
obj['theTeam'].push({"teamId":"4","status":"pending"});
jsonStr = JSON.stringify(obj);
// "{"theTeam":[{"teamId":"1","status":"pending"},{"teamId":"2","status":"member"},{"teamId":"3","status":"member"},{"teamId":"4","status":"pending"}]}"

var Str_txt = '{"theTeam":[{"teamId":"1","status":"pending"},{"teamId":"2","status":"member"},{"teamId":"3","status":"member"}]}';
If you want to add at last position then use this:
var parse_obj = JSON.parse(Str_txt);
parse_obj['theTeam'].push({"teamId":"4","status":"pending"});
Str_txt = JSON.stringify(parse_obj);
Output //"{"theTeam":[{"teamId":"1","status":"pending"},{"teamId":"2","status":"member"},{"teamId":"3","status":"member"},{"teamId":"4","status":"pending"}]}"
If you want to add at first position then use the following code:
var parse_obj = JSON.parse(Str_txt);
parse_obj['theTeam'].unshift({"teamId":"4","status":"pending"});
Str_txt = JSON.stringify(parse_obj);
Output //"{"theTeam":[{"teamId":"4","status":"pending"},{"teamId":"1","status":"pending"},{"teamId":"2","status":"member"},{"teamId":"3","status":"member"}]}"
Anyone who wants to add at a certain position of an array try this:
parse_obj['theTeam'].splice(2, 0, {"teamId":"4","status":"pending"});
Output //"{"theTeam":[{"teamId":"1","status":"pending"},{"teamId":"2","status":"member"},{"teamId":"4","status":"pending"},{"teamId":"3","status":"member"}]}"
Above code block adds an element after the second element.

First we need to parse the JSON object and then we can add an item.
var str = '{"theTeam":[{"teamId":"1","status":"pending"},
{"teamId":"2","status":"member"},{"teamId":"3","status":"member"}]}';
var obj = JSON.parse(str);
obj['theTeam'].push({"teamId":"4","status":"pending"});
str = JSON.stringify(obj);
Finally we JSON.stringify the obj back to JSON

In my case, my JSON object didn't have any existing Array in it, so I had to create array element first and then had to push the element.
elementToPush = [1, 2, 3]
if (!obj.arr) this.$set(obj, "arr", [])
obj.arr.push(elementToPush)
(This answer may not be relevant to this particular question, but may help
someone else)

Use spread operator
array1 = [
{
"column": "Level",
"valueOperator": "=",
"value": "Organization"
}
];
array2 = [
{
"column": "Level",
"valueOperator": "=",
"value": "Division"
}
];
array3 = [
{
"column": "Level",
"operator": "=",
"value": "Country"
}
];
console.log(array1.push(...array2,...array3));

For example here is a element like button for adding item to basket and appropriate attributes for saving in localStorage.
'<i class="fa fa-shopping-cart"></i>Add to cart'
var productArray=[];
$(document).on('click','[cartBtn]',function(e){
e.preventDefault();
$(this).html('<i class="fa fa-check"></i>Added to cart');
console.log('Item added ');
var productJSON={"id":$(this).attr('pr_id'), "nameEn":$(this).attr('pr_name_en'), "price":$(this).attr('pr_price'), "image":$(this).attr('pr_image')};
if(localStorage.getObj('product')!==null){
productArray=localStorage.getObj('product');
productArray.push(productJSON);
localStorage.setObj('product', productArray);
}
else{
productArray.push(productJSON);
localStorage.setObj('product', productArray);
}
});
Storage.prototype.setObj = function(key, value) {
this.setItem(key, JSON.stringify(value));
}
Storage.prototype.getObj = function(key) {
var value = this.getItem(key);
return value && JSON.parse(value);
}
After adding JSON object to Array result is (in LocalStorage):
[{"id":"99","nameEn":"Product Name1","price":"767","image":"1462012597217.jpeg"},{"id":"93","nameEn":"Product Name2","price":"76","image":"1461449637106.jpeg"},{"id":"94","nameEn":"Product Name3","price":"87","image":"1461449679506.jpeg"}]
after this action you can easily send data to server as List in Java
Full code example is here
How do I store a simple cart using localStorage?

make json from table

I want to make specific json from table. I have a table, which has rows and 4 columns.
Here is my table I want to build an jsonarray from the table.
First value in the left column is key of json and last value in the right column is a valueof json.
I mean I want to get from table jsonarray, it must look as
json_from_form = [{color: 'id',
name: "mouse",
x: "table",
y: "book"}];
I have tried to build json, but have a problem with structure and setting a key in json object.
Please help me to buld right structure of json object.
var json_from_form_tmp = {};
$('#table').find('tbody tr').each(function (i) {
//var name = $(this).find('td:first').text();
json_from_form_tmp[i] = {
imd: $(this).find('td:eq(3) input').val()
};
});
console.log(json_from_form_tmp);
Here is my DEMO

You should use the jQuery map-function for this, here is an example:
$(function () {
var m = $("table tr").map(function (index, e) {
return {
color: $(e).children().eq(0).text(),
name: $(e).children().eq(1).text()
}
}).get();
});
Where m will be an array of objects as defined inside the map function.

To set a property of the object (json_from_form_tmp), use the ['propertyName'] notation.
//get the name of the property from the first column
var name = $(this).find('td:first').text();
//use that name as the name of the property. Your value fetch was right!
json_from_form_tmp[name] = $(this).find('td:eq(3) input').val();
Here is your fiddle with a tiny modification.
http://jsfiddle.net/bMzq8/32/

Issue with using JSON.stringify after using jQuery.map

I am writing a bookmarklet (that will eventually be a plugin) to scrape web pages for list items in jQuery under a specified div. I'm having an issue with using JSON.stringify
The following code allows me to convert each individual item to JSON, but has issues when using join to concatenate each string.
var dMap = $("div").filter($("#<div-id>")).find("li").map(function() {
var iObject = {
id: $(this).data('id'),
text: $(this).text(),
list_name: $(this).closest('div').attr('id')
};
return JSON.stringify(iObject);
});
console.log(dMap);
This second snippet of code creates each object in the array correctly, but the resulting array doesn't log the resulting JSON.
var dMap = $("div").filter($("#,div-id.")).find("li").map(function() {
return {
id: $(this).data('id'),
text: $(this).text(),
list_name: $(this).closest('div').attr('id')
};
});
console.log(dMap);
var json = JSON.stringify(dMap);
console.log(json);
Any ideas?

According to the documentation for .map:
As the return value is a jQuery-wrapped array, it's very common to get() the returned object to work with a basic array.
Have you tried:
var json = JSON.stringify(dMap.get());

Develop Reference

JavaScript is the programming language of the Web.

How to get only 1st element of JSON data? - javascript

Assuming that you have array of objects var arr = [{ id:"1", price:"130000.0", user:55, }, { id:"2", price:"140000.0", user:55, }] console.log(arr[0].price) <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

You data isn't valid JSON, JSON data key must be wrap within double quote, but your data isn't wrapped in double quote var data = [{ "id":"1", "price":"130000.0", "user":55 },{ "id":"2", "price":"140000.0", "user":55 }] console.log(data[0]["price"]);

The element having the your JSON data means, we can able to use below code to get the first JSON data. element[0].price Thanks,

var my_first_json_obj = data_obj[0]; // Your first JSON obj (if it's an array of json object) var my_price = my_first_json_obj.price; // Your price $('#price').append(my_price);

If you want only the first item's price, you don't need a loop here. $('#price').append(data_obj[0].price); would work here. For further reading you can refer here

Following is the solution worked for my problem I use return false; $.each(data_obj, function(index, element) { $('#price').append(element.price[0]); return false; }); Which gives only 1st value of array elements.

Related

getJSON data add array item to variable

JQuery Datatables Row Data From AJAX Source

How to push new key/value pair into external json file? [duplicate]

make json from table

Issue with using JSON.stringify after using jQuery.map

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