JSON - Invalid Token - javascript

I watched a YouTube video trying to learn JSON for the first time. This is the example we did during the video, but at '[ I get an Invalid Token error when looking at the console. Sorry for the noob question! Thanks again.
<html>
<head>
<title>JSON Example</title>
</head>
<body>
<script type="text/javascript">
let companies =
'[
{
"name": "Big Corporation",
"numberOfEmployees": 10000,
"ceo": "Mary",
"rating": 3.6
},
{
"name": "Small Startup",
"numberOfEmployees": 3,
"ceo": null,
"rating": 4.3
}
]'
console.log(JSON.parse(companies))
((companies)[0].name)
</script>
</body>
</html>

The problem is not a JSON one but a JavaScript one. You have to use a particular syntax for multiline strings in JavaScript.
There are multiple ways of doing this but probably the simplest is to use backticks.
<html>
<head>
<title>JSON Example</title>
</head>
<body>
<script type="text/javascript">
let companies =
`[
{
"name": "Big Corporation",
"numberOfEmployees": 10000,
"ceo": "Mary",
"rating": 3.6
},
{
"name": "Small Startup",
"numberOfEmployees": 3,
"ceo": null,
"rating": 4.3
}
]`
console.log(JSON.parse(companies))
((companies)[0].name)
</script>
</body>
</html>
PS: As an aside you'll also get an error on the last line ((companies)[0].name) because the output of console.log isn't a function. Presumably you want another call to console.log

Related

dynatable not creating table from remote JSON

Here's feature-table.JSON in the same directory as the HTML file:
[
{
"band": "Weezer",
"song": "El Scorcho"
},
{
"band": "Chevelle",
"song": "Family System"
}
]
Here's my HTML file:
<!DOCTYPE html>
<html>
<head>
<script type="text/javascript" src="jquery-1.11.1.min.js">
<script type="text/javascript" src="jquery.dynatable.js"></script>
<script type="text/javascript">
$.getJSON("feature-table.JSON", function(data) {
alert(data);
$("#feature-table").dynatable({
dataset: {
records: data
}
});
});
</script>
</head>
<body>
<table id="feature-table">
<thead>
<th>band</th>
<th>song</th>
</thead>
<tbody>
</tbody>
</table>
</body>
</html>
The alert pops up with the correct JSON data so i know it's finding it. I've tried: version 2 of jQuery, uploading and using URLs of the js files to make sure the files are in the right place, $.ajax but then $.getJSON after reading Load remote JSON from Dynatable, and various other things. I'm out of ideas. What am I overlooking?
I discovered I needed to have my JavaScript inside $(document).ready(function(){...}).
Hope this helps.
Did you also include the metadata as per the documentation for the JSON array.
{
"records": [
{
"someAttribute": "I am record one",
"someOtherAttribute": "Fetched by AJAX"
},
{
"someAttribute": "I am record two",
"someOtherAttribute": "Cuz it's awesome"
},
{
"someAttribute": "I am record three",
"someOtherAttribute": "Yup, still AJAX"
}
],
"queryRecordCount": 3,
"totalRecordCount": 3
}

System Can't Find JSON file

I have a simple program I am writing that has 3 files:
1.an HTML file (index.html)
2.a Javascript file (app.js)
3.a JSON dataset (dataset.json)
All I want to do is get the browser to recognize the data and I can't do it.
My app.js file:
$(document).ready(function(){
$.getJSON('dataset.json', function(data){
console.log(data);
});
});
My dataset.json file:
[
{
"Gender": "Female",
"Height": 5'2,
"Weight": 100,
"Age": 25,
"Occupation": "Lawyer"
},
{
"Gender": "Male",
"Height": 5'9,
"Weight": 150,
"Age": 23,
"Occupation": "Student"
}
]
Any ideas? Am I missing something completely? On my index.html, all I have in the head is:
<head>
<meta charset="UTF-8">
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script>
<script type="text/javascript" src="app.js"></script>
</head>
You JSON file is invalid
"Height": 5'2, <-- that is not valid
"Height": 5'9, <-- that is not valid
Needs to be a string or a number
"Height": "5'2",
"Height": "5'9",
You have to open it with a live server, otherwise it won’t work (opening the index.html for example). You can use a VSCode Plugin (LiveServer) for that.

Why I have to access JSON in a special way in Angular? [duplicate]

This question already has answers here:
JavaScript property access: dot notation vs. brackets?
(17 answers)
How can I access and process nested objects, arrays, or JSON?
(31 answers)
Closed 8 years ago.
I'm working on AngularJs tutorial and I would like to access JSON. I do not understand why in tutorial they use [] to access JSON. When user click on the "a tag" it will put airport.code into setAirport function and get the currentAirport.name back
Here is the code:
HTML:
<html ng-app>
<head>
<title>Demo</title>
<script type="text/javascript" src="js/lib/angular.min.js"></script>
<script type="text/javascript" src="js/controllers/app.js"></script>
</head>
<body>
<div ng-controller="AppCtrl">
<h1>AngulAir</h1>
<ul>
<li ng-repeat="airport in airports">
<a href="" ng-click="setAirport(airport.code)">
{{airport.code}} - {{airport.city}}
</a>
</li>
</ul>
<p ng-show="currentAirport">Current Airport : {{currentAirport.name}}</p>
</div>
and this is the JS code:
function AppCtrl ($scope) {
$scope.airports = {
"PDX": {
"code": "PDX",
"name": "Portland International Airport",
"city": "Portland",
"destinations": [
"LAX",
"SFO"
]
},
"STL": {
"code": "STL",
"name": "Lambert-St. Louis International Airport",
"city": "St. Louis",
"destinations": [
"LAX",
"MKE"
]
}
};
$scope.currentAirport = null;
$scope.setAirport = function (code){
$scope.currentAirport = $scope.airports[code];
};
}
you can see in the last statement ---> $scope.currentAirport = $scope.airports[code]; it use [] to access the JSON. I do not understand why it is used this way. I tried to experiment in another situation and it seems to work differently, here is my experiment:
HTML:
<html>
<head>
<title>hello world</title>
</head>
<body>
</body>
<script type="text/javascript" src=jsfile.js></script>
<script type="text/javascript">
alert(airports[code]);
</script>
JS file:
airports = {
"PDX": {
"code": "PDX",
"name": "Portland International Airport",
"city": "Portland",
"destinations": [
"LAX",
"SFO"
]
},
"STL": {
"code": "STL",
"name": "Lambert-St. Louis International Airport",
"city": "St. Louis",
"destinations": [
"LAX",
"MKE"
]
}
};
and I get this on my browser "ReferenceError: Can't find variable: code" WHY? the JSON access way of this statement -----> $scope.currentAirport = $scope.airports[code]; is not equal to this statement -----> alert(airports[code]); ?????
why in the second case I can't use [] ? anyone knows please tell me
In the first example:
$scope.setAirport = function (code){
$scope.currentAirport = $scope.airports[code];
};
code is passed to the function and they use it reference the airport code in the airport object.
In your example:
alert(airports[code]);
code is undefined.
You need to define code, or manually pass an airport code to it.

Parse local JSON file with jQuery and Javascript

I'm trying to parse a JSON file located on my computer. I want to parse it. The JSON file has this structure:
{
"sites": {
"site": [
{
"id": "01",
"name": "Sito 1",
"src": "localhost/root/coupon/sito1",
"expiryDate": "29 Ago 2013"
},
{
"id": "02",
"name": "Sito 2",
"src": "localhost/root/coupon/sito2",
"expiryDate": "30 Ago 2013"
},
{
"id": "Sito 3",
"name": "Sito 3",
"src": "localhost/root/coupon/sito2",
"expiryDate": "31 Ago 2013"
}
]
}
}
In my html I import the jQuery library and I made a function that will load when the page is loaded. The code is below:
<!DOCTYPE html>
<html lang="it">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width; initial-scale=1.0; maximum-scale=1.0; user-scalable=0;"/>
<title>Lista coupon</title>
<script type="text/javascript" src="jquery-1.9.1.min.js"></script>
<script type="text/javascript" charset="utf-8">
function loadJson() {
window.alert("Carico il contenuto del file JSON per popolare la lista");
$(document).ready(function()
{
$.getJSON('data.json', function(json) {
console.log(json);
});
});
}
</script>
</head>
<body onload="loadJson();">
<div id="header">
<h1>Lista coupon salvati</h1>
</div>
<div id="content">
<p>Di seguito trovi tutte le promozioni salvate</p>
</div>
<div id="footer">
</div>
</body>
</html>
Now I saw on firebug console that it can read correctly the JSON file, but I don't know how to parse this JSON. I searched in google, but I found a lot of example that use a remote JSON. Can you help me to understand how to parse a local JSON file?
Thank you
PS: note the site I post on here it's made for mobile browser.
getJSON will parse it for you.
Just remove the var obj = $.parseJSON(json); line (since that will stringify the object and try to parse it as JSON (which it won't be)).
I don't think you need to parse the json. It will automatically parse the json since you are using $.getJSON().

Parse and iterate JSON with multiple headers

I'm able to iterate through a simple json loop, but actually the API i'm working with returns a response with multiple headers and I tried different methods to access the results objects but still not working, the response looks like this:
"meta": {
"name": "openaq-api",
"license": "CC BY 4.0",
"website": "https://docs.openaq.org/",
"page": 1,
"limit": 100,
"found": 1544
},
"results": [
{
"city": "Buenos Aires",
"country": "AR",
"locations": 4,
"count": 8064
},
{
"city": "Gemeinde Wien, MA22 Umweltschutz",
"country": "AT",
"locations": 21,
"count": 136958
},
What I'm trying to do is to access results then iterate with cities infos, my runnable attempts:
<!DOCTYPE html>
<html lang="en">
<head><meta charset="utf-8">
<title>Open AQ API</title></head>
<body>
<div id="data"></div>
<script src="https://code.jquery.com/jquery-3.2.1.js"
integrity="sha256-DZAnKJ/6XZ9si04Hgrsxu/8s717jcIzLy3oi35EouyE="
crossorigin="anonymous"></script>
<script type="text/javascript">
var url = "https://api.openaq.org/v1/cities";
$.getJSON(url, function (data) {
var json = data
$.each($.parseJSON(json), function() {
alert(results.this.city);
});
});
</script>
</body>
</html>
Attempt 2 :
// data[i]
$.each(data, function(i, item){
$('#data').append(
$('<h1>').text(item.results.city),
$('<div>').text(item.results.country),
$('<h6>').text(data[i].results.count),
);
});
This works just fine, try this instead for your jQuery.
<!DOCTYPE html>
<html lang="en">
<head><meta charset="utf-8">
<title>Open AQ API</title></head>
<body>
<div id="data"></div>
<script src="https://code.jquery.com/jquery-3.2.1.js"
integrity="sha256-DZAnKJ/6XZ9si04Hgrsxu/8s717jcIzLy3oi35EouyE="
crossorigin="anonymous"></script>
<script type="text/javascript">
var url = "https://api.openaq.org/v1/cities";
$.getJSON(url, function (data) {
$.each(data.results, function(i, result) {
console.log(result.city);
});
});
</script>
</body>
</html>
Kindly update below logic, data will give full response, SO you have to take results from data like $.parseJSON(json).results and then run for each loop as shown below.
$.each(json.results, function(index,value) {// json is same as data as per your code
alert(value.city);
});

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