I am wanting to pass a dictionary of type <int,int>
to my controller via an Ajax post. The main reason here is the post may have between 1-3 key value pairs here (none of these values are known at compile time) and in the future it may go up to 5.
Also in the post I have to pass in some other data, such as Id and name, which all works as normal.
How would I construct this dictionay in the javascript then send it via the JQuery post and finally receive it on the controller to process?
Edit 2: I have decided to just solve this with a post for each value instead of trying to pass a dictionary.
EDIT: Here is my source for the function so you can see what I am trying:
function BindAddMenuItem() {
$(".AddMenuItem").click(function (e) {
e.preventDefault();
//get header id from link by removing addmenuitem from this.id
var currentId = $(this).attr("id").replace("AddMenuItem", "");
//get itemnumber, itemname, itemdetails from textboxes with same header id
var restaurantId = jQuery.trim($("#RestaurantId").val());
var itemNumber = jQuery.trim($("#ItemNumber" + currentId).val());
var itemName = jQuery.trim($("#ItemName" + currentId).val());
var itemDetails = jQuery.trim($("#ItemDetails" + currentId).val());
var costs = new Object();
//select all textboxes with class "Header" + currentId
$(".Header" + currentId).each(function (i) {
var optionId = $(this).attr("id").replace("Option", "");
costs[optionId] = $(this).val();
});
$.ajax(
{
type: "POST",
url: "/Menu/AddMenuItem",
data: "reastaurantId=" + restaurantId + "&menuHeaderId=" + currentId + "&itemNumber=" + itemNumber + "&itemName=" + itemName + "&itemDetails=" + itemDetails + "&costs=" + costs,
dataType: "html",
success: function (result) {
var domElement = $(result);
$("#MenuContainer").replaceWith(domElement);
var newNum = parseInt(itemNumber) + 1;
$("#ItemNumber" + currentId).val(newNum);
BindAllBehaviours();
}
});
});
}
Something like (javascript)
dict = new Object();
dict['12'] = 5;
dict['13'] = 6;
dict['1000'] = 21;
dict['9'] = 13;
dict['13'] = 48;
$.post('/client.mvc/mypostaction/', { myDictionary: dict });
You can then post the dict
object to your controller using a Dictionary<int, int>
as property type.
ActionResult MyPostAction(Dictionary<string, int> myDictionary)
edit from author's code second time:
The following works for me, when having a Dictionary<string, int> kvPairs
. <int, int>
isn't going to work after all.
Make your post like:
var dict = new Object();
dict['13'] = 9;
dict['14'] = 10;
dict['2'] = 5;
$.post('controller.mvc/Test', { 'kvPairs': dict }, function(obj) { $('#output').html(obj.Count); });
JavaScript object / dictionary has to be passed as a list of key-value pairs to ASP.NET MVC controller when Dictionary<TKey, TValue>
is expected. Example:
If you have a dictionary like this:
public Dictionary<string, decimal?> SomeMapping { get; set; }
then you have to use something like this in your JavaScript:
var sourceMapping = { a: 1, b: 1.5, c: null };
var SomeMapping = [];
for (var key in sourceMapping) {
if (sourceMapping.hasOwnProperty(key)) {
SomeMapping.push({ Key: key, Value: sourceMapping[key] });
}
}
I've used this approach in asynchronous POST request (sent using jQuery) that had content type set to 'application/json'
(this may or may not be important in your case).
Client (JavaScript):
var dict = new Object();
dict.Key1 = "Value1"
dict.Key2 = "Value2"
$.post('/YourController/YourAction/', dict);
NOTE: The "dict" objects gets serialized behind the scenes before being sent to your action.
Server:
public ActionResult YourAction()
{
string postData = string.Empty;
using (StreamReader sr = new StreamReader(Request.InputStream))
{
postData = sr.ReadToEnd();
}
//Load post data into JObject (Newtonsoft.Json)
JObject o = JObject.Parse(postData);
//Extract each key/val
string val1 = (string)o["Key1"];
//Do whatever....
}
None of these worked for me except for mczers , but he doesn't show all the steps, and makes it difficult when you're trying to remember how you set up an ajax request. So I wanted to put everything that actually just works. First, in JavaScript:
var validDict = new Array();
validDict[0] = { key: 1, value: 4 }
validDict[1] = { key: 42, value: 5}
var path = "@Url.Action("ControllerName", "ActionName")";
$.ajax({
url: path,
type: "POST",
data: JSON.stringify(validDict),
contentType: "application/json; charset=utf-8",
async:false,
success: function(status, xhr)
{
alert(status);
},
error: function(xhr, status, error)
{
alert(error);
}});
Then in your controller:
[HttpPost]
public ActionResult ActionName(Dictionary<int, int> validDict)
{
// doStuff();
return Content("Success");
}
A dictionary of the kind IDictionary<string, string> on server side can be posted from javascript like
{"Key1": "Value1", "Key2": "Value2"}
on the Server Side in ASP.NET Web API
[HttpPost]
public IHttpActionResult([FromBody]IDictionary<string, string> requestParam){
}
Above example is for an Http POST with the Json data in the Body
For passing a Dictionary I found the following working answer: submitting-a-dictionary-to-an-asp-net-mvc-action
@model WebApplication3.Controllers.ExampleViewModel @{ ViewBag.Title = "New";
var first = Guid.NewGuid(); var second = Guid.NewGuid(); }
<h2>New</h2>
@using (Html.BeginForm(new { action = "create", controller = "home" })) {
foreach (var kvp in Model.Values) {
<p>
<input type="text" name="Model.Values[@first].Key" value="@kvp.Key" />
<input type="text" name="Model.Values[@first].Value" value="@kvp.Value" />
<input type="hidden" name="Model.Values.Index" value="@first" />
</p>
}
you have to generate A Guid for the dictionary index, and you have to create 3 inputs, one for the Key, one for the Value and one for the Index of the Dictionary
Also I have submited using Jquery with the following:
$('form#frmFormId').submit(function (e) {
e.preventDefault();
var formData = new FormData(this);
//debugger;
$('#cover-spin').show(100);
$.ajax({
type: 'POST',
url: $(this).attr('action'),
data: formData,
processData: false,
contentType: false
}
);
return false;
});
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