Web API send multiple objects via jQuery POST

Question

I have a Web API controller that accepts an Inspection model, i.e.

public class Inspection
{
    public int ID {get; set;}
}

and I have create a POST method on the controller. This works fine and I have tested it with jQuery.

In my javascript page I create an Inspection, i.e.

var inspection = {
    ID: '123456'
};

and then do $.ajax like this:

var p = $.ajax({
    type: 'POST',
    url: 'http://...',
    cache: false,
    data: JSON.stringify(item),
    dataType: 'json',
    success: function(response) {
        //do stuff
    }
});

So my question is: if I have multiple inspections to post, how do I send them all to the controller either in one batch or in single batches?

Can you post your API controller and its action method? Also, instead of relying on the model binding to a List<Inspection> have you tried using a method that accepts HttpRequestMessage and then parsed the request content? — Oppositional
– Oppositional, Commented Dec 27, 2012 at 20:46

Mark Berryman · Accepted Answer · 2012-12-27 19:48:50Z

3

POST'ing multiple integers in a single call should be easy to do. A few quick things to check:

In your controller, does your method signature look something like:
```
public void Post([FromBody]int[] values) { // code here }
```
Note the use of the [FromBody] attribute.
In your POST, is the content type header set to "Content-Type: application/json"?

answered Dec 27, 2012 at 19:48

Mark Berryman

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1 Comment

markp3rry Over a year ago

I'm going to give you an upvote and the accepted answer because part of my problem was that I wasn't setting Content-Type as you suggested.

Jason Towne · Accepted Answer · 2012-12-20 16:34:46Z

0

I have used the jQuery.json plugin for this kind of situation in the past.

Here's an example I found on how you can use it to send multiple items in a single AJAX call:

<script src="<%= Url.Content("~/Scripts/jquery-1.3.2.min.js") %>" type="text/javascript"></script>
<script src="<%= Url.Content("~/Scripts/jquery.json-2.2.min.js") %>" type="text/javascript"></script>
<script type="text/javascript">
  function savePayment() {
    //Creating some test data
    var lineItems = new Object();
    lineItems.Entrys = new Array();
    lineItems.Entrys[0] = new Object({ Approved: "1.0", Deductible: "1.0", Coinsurance: "1.0", PaymentAmount: "1.0", VisitId: "1.0", VisitChargeId: "1.0" });
    lineItems.Entrys[1] = new Object({ Approved: "2.0", Deductible: "2.0", Coinsurance: "2.0", PaymentAmount: "2.0", VisitId: "2.0", VisitChargeId: "2.0" });


    //Posting them to server with ajax
    $.ajax({
      type: 'POST',
      contentType: 'application/json; charset=utf-8',
      url: '<%=Url.Action("SavePayment", "Home") %>',
      dataType: 'json',
      data: $.toJSON(lineItems),
      success: function(result) {
        if (result) {
          alert('Success');
        }
        else {
          alert('Failure');
        }
      }
    });
  }
</script>

answered Dec 20, 2012 at 16:34

Jason Towne

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2 Comments

markp3rry Over a year ago

Sounds like a good idea, I will give it a go in the morning. It looks like you're posting back to a 'classic' controller and not a Web API one - am I correct or not?

Jason Towne Over a year ago

@markp3rry Yes, this example isn't for Web API. The goal was mainly to show you how you could bundle multiple Inspection objects together and use jQuery.json to bundle them together to send them in a single POST.

tiffon · Accepted Answer · 2012-12-20 16:50:10Z

0

Hm, Depending on what your server is expecting, something like this might work:

var itemArr = [inspection0, inspection1, inspection2]; // etc...

var p = $.ajax({
    type: 'POST',
    url: 'http://...',
    cache: false,
    data: JSON.stringify(itemArr),
    dataType: 'json',
    success: function(response) {
        //do stuff
    }
}).fail(function(data) {
    // handle failure
});

Or, to send in multiple batches:

var i = 0,
    max = itemArr.length;

for (; i < max; i++) {
    $.ajax({
        type: 'POST',
        url: 'http://...',
        cache: false,
        data: JSON.stringify(itemArr[i]),
        dataType: 'json',
        success: function(response) {
            //do stuff
        }
    }).fail(function(data) {
        // handle failure
    });
}

Also, it's probably a good idea to add a .fail(...) handler, as well.

edited Dec 20, 2012 at 16:50

answered Dec 20, 2012 at 16:33

tiffon

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4 Comments

markp3rry Over a year ago

Just tried this and the controller isn't interpreting the data correctly.

tiffon Over a year ago

@markp3rry Any luck with my update? (Splitting into multiple HTTP calls.) Could you change the method you have configured to the 'POST' verb to accept IEnumerable<Inspection> or List<Inspection> as the parameter?

tiffon Over a year ago

@markp3rry I didn't realize this question related to ASP.net. Let me know if my answer doesn't apply.

markp3rry Over a year ago

tried doing pretty much what you suggested. The ajax request is hitting the 'success' part but the List<inspections> in the web service method is empty.

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