Uncaught Typeerror: Cannot Use 'In' Operator to Search for 'Length' In

Uncaught TypeError: Cannot use 'in' operator to search for 'length' in when getting checked values by data attribute

You're using $.each on a string, it needs to be an object or an array.

Try changing your code to this

var subjects_names = [];
$.each($("input[name='exam_subjects']:checked"), function () {
    subjects_names.push($(this).data("subjectName"));
});

Or better yet use .each as your iterating over a jQuery object

var subjects_names = [];
$("input[name='exam_subjects']:checked").each(function () {
    subjects_names.push($(this).data("subjectName"));
});

Error : Cannot use 'in' operator to search for 'length' in [{ID:2,Name:EAA2}] when performing $.each

It would seem that "over-stringifying" is an issue with JSON. If I doubled the JSON.parse or removed the JSON.stringify it all works correctly.

Annoying!!

Uncaught TypeError: Cannot use 'in' operator to search for 'options' in Mumbai

React Select expects the options to be passed as array of object in this format:

{ value: 'value here', label: 'Label here' }

So, you should be passing locations as an array of objects to options prop of React-Select select as:

[
  {  label: "Mumbai", value: "Mumbai" },
  {  label: "tuljapur", value: "tuljapur" },
  ....
]

Reference: https://react-select.com/home#getting-started

Code Sandbox link https://codesandbox.io/s/pb4r2s?module=/example.tsx

Cannot use 'in' operator to search for 'length' in... Need to change string?

I think use can use:

$('body').on('click', '#usejson', function() {
        //var data = $("#jsonarray").html();
        var data = JSON.parse($("#jsonarray").html());

        $.each(data, function(i, item) {
            alert(data[i].bodypart);
        });
    });

But i don't understand that why you send json to html and then get it from html.

Cannot use 'in' operator to search for 'length' in

It's already a JSON object. You cannot parse it again.

to receive HTTP error code, provide a error callback function next to success, showed my code below.

function countryPage() {  $.ajax({    url: "https://en.wikipedia.org/w/api.php?action=parse&disablelimitreport=true&format=json&prop=text|langlinks&noimages=true&mobileformat=true&page=1&callback=?",    contentType: "application/json; charset=utf-8",    dataType: "jsonp",    success: countryPageSuccess,    error: function(jqXHR, textStatus, errorThrown) {        alert(jqXHR.status);        alert(textStatus);        alert(errorThrown);    }  });}
function countryPageSuccess(data, result) {    $.each(data, function(i, item) {        console.log(item);    });}
countryPage();

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

Cannot use 'in' operator to search for 'length' in when retrieving data from select

The in operator only works on objects.

could be the data you are sending needs parsing (i.e a stringified json).

try parsing your data JSON.parse(data)

$.each(JSON.parse(data), function(index, element){...})

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