Passing an array of integers from JavaScript to a controller action of List<int>

Question

I am using javascript code to postdata to a controller action coded in C#. I am getting a null value when attempting to pass an array of integers in javascript created as follows:

var answers = [];
answers.push(1);
answers.push(2);
answers.push(3);

I can see from javascript alert that the values are going into array as when I try answers.tostring I am getting the value "1,2,3" as expected, I am then trying the following postdata

var postData = {
                'surveyID': surveyID,
                'questionID': questionID,
                'answers': answers,
                'answerText': null,
                'comment': comment,
                'questionType': questionType
            };

This is targetting the following controller action but the array of integers does not seem to be carrying across to the controller action as my List is always null

[HttpPost]
public PartialViewResult GoForward(int surveyID, int questionID, List<int> answers, string answerText, string comment, string questionType)
{}

Any know how I can get the postdata array to translate to a List that is not null?

Yes my question says that, I am looking for a means of passing it this way — Jay
– Jay, Commented Apr 23, 2014 at 0:32

emn178 · Accepted Answer · 2014-04-23 02:15:06Z

0

Because MVC expects the data in QueryString pattern like this:
answers=1&answers=2&answers=3

If you use jQuery to do AJAX, default is
answers[]=1&answers[]=2&answers[]=3

You could try traditional option

$.ajax({
  //...
  traditional:true,
  //...
});

refer to https://api.jquery.com/jQuery.ajax/

answered Apr 23, 2014 at 2:15

emn178

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