How to pass string array to controller using ajax?

Question

// something defined deleteArr and pass values to it
var postData = { deleteArr: deleteArr };
if(deleteArr.length > 0)
    {
        $.ajax({
            url: "@Url.Action("Delete", "ASZ01")",
            type: "POST",
            data: postData,
            contentType: "application/json; charset=utf-8",
            success: function (response) {
                alert("success.");
            },
            error: function (response) {
                alert(deleteArr[0]);
            }
        });
        deleteArr.length = 0;
    }

The above code is javascript. Until $.ajax begin I can confirm that values in array is correct in immediate window,but when it comes to error: I got "undefined". And the following is my function in controller

public void Delete(List<string> deleteArr)
    {
        service.Delete(deleteArr);
    }

The second question is that I set breakpoint on that function but it can't stop. I think maybe my ajax form is wrong?

Please refer to this [link](http://stackoverflow.com/questions/309115/how-can-i-post-an-array-of-string-to-asp-net-mvc-controller-without-a-form) — Vidhyadhar Galande, Oct 28 '16 at 07:21

score 0 · Accepted Answer · answered Oct 28 '16 at 07:13

0

Stringify to JSON, add the dataType: 'json' and then pass and also correct your ""

var postData = JSON.stringify({ deleteArr: deleteArr });

if(deleteArr.length > 0)
    {
        $.ajax({
            url: @Url.Action("Delete", "ASZ01"),
            type: "POST",
            data: postData,
            dataType: 'json'
            contentType: "application/json; charset=utf-8",
            success: function (response) {
                alert("success.");
            },
            error: function (response) {
                alert(deleteArr[0]);
            }
        });
        deleteArr.length = 0;
    }

answered Oct 28 '16 at 07:13

Suren Srapyan

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is `datatype:json` required. ? – Rajshekar Reddy Oct 28 '16 at 07:15
@Reddy I think yes – Suren Srapyan Oct 28 '16 at 07:15
I thought it was only required if the return type from the server will be a JSON. For passing to server I dont think its necessary.. – Rajshekar Reddy Oct 28 '16 at 07:16
@Suren Srapyan, dataType is not required if return type format coming from server is not matter. – Natiq Oct 28 '16 at 07:20
Thank you very much – Suren Srapyan Oct 28 '16 at 07:23

score 0 · Answer 2 · answered Oct 28 '16 at 07:17

Small change to your postData

var postData = { deleteArr: JSON.stringify(deleteArr) };

Idea is to convert your array data into string format ie:JSON and posting to the server, The default Model binder of MVC framework will handle the part to convert them into List<string> for you

How to pass string array to controller using ajax?

2 Answers2

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