What is the best way to pass a sophisticated JavaScript object to an ASP.net WebMethod?

I am attempting to send my client-side custom JavaScript object to an ASP.net Web Method using jQuery Ajax. Below is an example of the object I am working with:

function Customer() {
    this.Name = "";
    this.Surname = "";

    this.Addresses = new Array();
}

I gather data using the following method:

function buildCurrentCustomer() {
    var currentCustomer = new Customer();

    /** General Info **/
    currentCustomer.Name = $("#Name").val();
    currentCustomer.Surname = $("#Surname").val();

    currentCustomer.Addresses = new Array();
    currentCustomer.Addresses["HOME"] = $("#adHome").val();
    currentCustomer.Addresses["OFFICE"] = $("#adOffice").val();

    return currentCustomer;
}

To send this data, I use the following code:

$.ajax({
        type: "POST",
        url: "../_layouts/CustomerManager/MasterPage.aspx/SetCustomer",
        contentType: "application/json; charset=utf-8",
        dataType: "json",
        data: "{customer: " + JSON.stringify(currentCustomer) + "}",
        cache: false,
        success: function (result) {

        },
        error: function (ex) {
            WriteToConsole(ex.responseText);
        }
    });

The server-side method I am calling looks like this:

[WebMethod]
public static bool SetCustomer(CustomerModel Customer)
{
    //My code...
}

And here is the CustomerModel class used in the server-side method:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Common.Model.JavaScriptModel
{
    public class CustomerModel
    {
        /** General Info **/
        public string Name {get;set;}
        public string Surname {get;set;}

        public Dictionary<string, string> Addresses { get; set; }
    }
}

However, I am encountering an issue where the server-side method does not execute properly when called through Ajax. If I adjust the signature of the server-side method to accept a List instead:

public static bool SetCustomer(List<CustomerModel> Customer)

The SetCustomer method is then executed, but the List remains empty. Can anyone provide insight into why I might be experiencing this problem and where I can find documentation on how to resolve it?

Thank you.

Answer №1

When using the data in this way, make sure to adjust the parameters accordingly:

data: "{customer: " + JSON.stringify(currentCustomer) + "}",

In the code behind, ensure that the parameter matches customer, not Customer:

public static bool SetCustomer(CustomerModel customer) { ... }

Also, be aware of the discrepancy between the Addresses object in JavaScript and in ASP.NET:

string Name;
string Surname;
List<string> Addresses;

Adjust your Addresses class to properly handle the data from the client side:

public List<string> Addresses { get; set; }

Furthermore, modify the code inside buildCurrentCustomer for Addresses to correctly add values to an array:

currentCustomer.Addresses = new Array();
currentCustomer.Addresses.push($("#adHome").val());
currentCustomer.Addresses.push($("#adOffice").val());

*Note:

If you prefer to use Addresses as an object with specific properties like HOME and OFFICE, consider adjusting the structure according to your needs.

Edit:

You may also try utilizing a JavaScript object to mimic a dictionary-like structure:

currentCustomer.Addresses = {};
currentCustomer.Addresses["Home"] = $("#adHome").val();
currentCustomer.Addresses["Office"] = $("#adOffice").val();

If needed, create a separate class for Address and change the Addresses property in your code:

public List<Address> Addresses { get; set; }

Add the Address class:

public class Address
{
    public string Home {get;set;}
    public string Office {get;set;}
}

Explore these options to ensure compatibility and proper handling of your data.

Answer №2

To modify your source code, follow these steps:

Using AJAX-

data:  JSON.stringify({'user':currentUser});

Implementing the ASP.net Web Method-

 [WebMethod]
    public static bool UpdateUser(object user)
    {
        UserModel UM = new UserModel();
        _Serializer = new JavaScriptSerializer();
        _StringBuilder = new StringBuilder();
        _Serializer.Serialize(user, _StringBuilder);
        UM = _Serializer.Deserialize<UserModel>(_StringBuilder.ToString());
    }

Remember to declare and initialize _Serializer and _StringBuilder variables as global variables at the top of your page...

    public static JavaScriptSerializer _Serializer;
    public static StringBuilder _StringBuilder;

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