Question 69910 in Ajax Question posted in
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ajax returning json data as undefined – Jquery ajax

when i run below code.
it makes error and alert "fail error:StntaxError: Unexpected token < in JSON at position 0 data:undefined"
what is the problem ??

$("#a").click(function () {
  st_dt = $("#st_dt").val();
  end_dt = $("#end_dt").val();
  lot_cd = $("#lot_cd").val();
  var obj = { st_dt: st_dt, end_dt: end_dt, lot_cd: lot_cd };
  var json_1 = JSON.stringify(obj);
  $.ajax({
    type: "POST",
    url: '{{ url_for("get_operid") }}',
    data: json_1,
    dataType: "JSON",
    success: function (data) {
      alert("Successn" + data);
    },
    error: function (request, status, error, data) {
      alert("failn" + "error:" + error + "n data:" + data);
    }
  });
});
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2

Answers


  1. 0

    Looking at the code it looks like a Laravel API request using Blade Template or the Function url_for is in Flask… In either case

    That means the response for the api request is HTML string instead of
    a json response…

    i.e. The API request is returning a login page or some HTML page…

    To check the response you can open the Chrome Devtools in the Network tab check the response of the API…

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  2. 0

    what you can try is :

    var obj = { st_dt: st_dt, end_dt: end_dt, lot_cd: lot_cd };
console.log(obj);
var json_1 = JSON.stringify(obj);
console.log(json_1);

    Then See in browser console what is your object and if the JSON converting your object properly.

    If that is ok , Your request should be done currectly. And try to see what are the data you getting as response with:

    success: function (data) {
      consoel.log('response below');
      console.log(data);
 }

    You will find the error. I hope.

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