Pass array to mvc Action via AJAX

Question

I m trying to pass an array  or IEnumerable  of ints from via AJAX to an MVC action and I need a little help    the javascript is     get   controller MyAction     vals  arrayOfValues    function  data         and the controller action is   public ActionResult MyAction IEnumerable lt int gt  arrayOfValues     At the moment the request is formatted as   controller MyAction   1301503418429 amp arrayOfValues   491 amp arrayOfValues   368 amp arrayOfValues   235 amp arrayOfValues   437   So I m almost there  if I take the square brackets off I get the correct response  How should I be passing that array into my get so that the controller can recognise what it is    Many thanks for your help  Dave

User · Answer

I work with asp net core 2 2 and jquery and have to submit a complex object   main class   from a view to a controller with simple data fields and some array s  As soon as I have added the array in the c   main class  definition  see below  and submitted the  correct filled  array over ajax  post   the whole object was null in the controller  First  I thought  the missing  traditional  true   to my ajax call was the reason  but this is not the case  In my case the reason was the definition in the c   main class   In the  main class   I had     public List lt EreignisTagNeu gt  oEreignistageNeu   get  set      and EreignisTagNeu was defined as   public class EreignisTagNeu    public int iHME Key   get  set         I had to change the definition in the  main class  to    public List lt int gt  oEreignistageNeu   get  set      Now it works  So    for me it seems as asp net core has a problem  with post   if the list for an array is not defined completely in the  main class   Note   In my case this works with or without  traditional  true   to the ajax call

User · Answer

Quite a late  but different answer to the ones already present here   If instead of   ajax you d like to use shorthand functions   get or   post  you can pass arrays this way    Shorthand GET  var array    1  2  3  4  5     get   controller MyAction     param   data  array    true   function data              Action Method public void MyAction List lt int gt  data           do stuff here       Shorthand POST  var array    1  2  3  4  5     post   controller MyAction     param   data  array    true   function data              Action Method  HttpPost  public void MyAction List lt int gt  data           do stuff here      Notes    The boolean parameter in   param is for the traditional property  which MUST be true for this to work

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If you are migrating to ASP NET Core MVC from  Net Framework MVC like I was  things have changed slightly  The ajax call must be on the raw object using stringify so rather than passing data of   vals  arrayOfValues   it should be JSON stringify arrayOfValues  as follows     ajax      url   controller myaction      data  JSON stringify arrayOfValues      success  function data       Whatever            The other change that has been made in ASP NET Core is to prevent cross-site request forgery so for calls to an MVC action from an ajax method the  FromBody  atribute must be applied to the action parameter as follows   public ActionResult MyAction  FromBody  IEnumerable lt int gt  arrayOfValues

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You should be able to do this just fine     ajax      url   controller myaction      data  JSON stringify         myKey  myArray           success  function data       Whatever            Then your action method would be like so   public ActionResult List lt int gt  myKey           Do Stuff     For you  it looks like you just need to stringify your values  The JSONValueProvider in MVC will convert that back into an IEnumerable for you

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IF ALL ELSE FAILS     None of the other answers here solved my problem  I was attempting to make a GET method call from JavaScript to an MVC Web API controller  and to send an array of integers as a parameter within that request  I tried all the solutions here  but still the parameter on my controller was coming up NULL  or Nothing for you VB users     I eventually found my solution in a different SO post  and it was actually really simple  Just add the  FromUri  annotation before the array parameter in the controller  I also had to make the call using the  traditional  AJAX setting to avoid bracket annotations   See below for the actual code I used in my application     Controller Signature    NOTE  The annotation in C  would be  FromUri     JavaScript     get   api InventoryApi GetBalanceField     param  productIds   42   inventoryFormId  5493  inventoryBalanceType   Beginning   true   done function data   console log data          Actual URL String   http   randomhostname api InventoryApi GetBalanceField productIds 42 amp inventoryFormId 5493 amp inventoryBalanceType Beginning

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The answer to use the  traditional  option is correct   I m just providing some more background info for this who wish to learn more   From the jQuery documentation      As of jQuery 1 8  the   param   method no longer uses   jQuery ajaxSettings traditional as its default setting and will   default to false    You can also read more here  http   michaelsync net 2012 04 05 tips-asp-net-mvc-javascriptserializer-3-questions-and-3-answers and http   haacked com archive 2008 10 23 model-binding-to-a-list aspx  HTH

User · Answer

You need to convert Array to string      arrayOfValues    1  2  3       get   controller MyAction     arrayOfValues   1  2  3     function  data         this works even in form of int  long or string  public ActionResult MyAction int   arrayOfValues

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I have had issues in the past when attempting to perform a POST  not sure if that is exactly what you are doing  but I recall when passing an array in  traditional must be set to true    var arrayOfValues   new Array        Populate arrayOfValues     ajax          type   POST         url    lt    Url Action  MyAction   Controller    gt          traditional  true        data     arrayOfValues   arrayOfValues

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If you re using ASP NET Core MVC and need to handle the square brackets  rather than use the jQuery  traditional  option   the only option I ve found is to manually build the IEnumerable in the contoller method   string arrayKey    p      var pArray   HttpContext Request QueryString Value      Split   amp         Where s   gt  s Contains arrayKey        Select s   gt  s Substring arrayKey Length

User · Answer

Set the traditional property to true before making the get call  i e    jQuery ajaxSettings traditional   true    get   controller MyAction     vals  arrayOfValues    function  data

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A bit late here  but I could use SNag s solution further into   ajax    Here is the code if it would help anyone   var array    1  2  3  4  5      ajax       type   GET       url    controller MyAction       data    param   data  array   true       contentType   application json  charset utf-8       success  function  data               error  function  x  y  z                  Action Method public void MyAction List lt int gt  data           do stuff here

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