操作数中无效的“ in”

Question

I send the request to server using jquery $.ajax and it returns JSON.

$.ajax({
  url: 'moreMonth.ajax',
  data: { startIndex: id },
  success: function(data) {
    $.each(data, function(k, v) {
      alert(k + ':' + v); 
    });
  }
});

But I've got an error

invalid 'in' in operand a

As far as I can understand - is it a problem with success block?

Log:

"[
  {"name":"Advanced Complexity Theory.rar","size":672398,"present":true,"display":false,"publisherId":1,"downloadDate":"Jun 9, 2014 11:05:28 AM","id":11},
  {"name":"Algorithms and Complexity, Internet Edition.rar","size":971299,"present":true,"display":false,"publisherId":1,"downloadDate":"Jun 9, 2014 11:05:28 AM","id":12}
]"

Answer 1

You are trying to iterate over a string, that is causing this error

variable data is string, try converting that to an array.

Try using $.parseJSON(data)

    $.ajax({
               url: 'moreMonth.ajax',
               data: { startIndex: id },
               success: function(data) {
                   data = $.parseJSON(data);
                   $.each(data, function(k, v) {
                      alert(k + ':' + v); 
                   });
               }

});