How to Change parameter used in datatables ajax url.Action on Ajax.reload

To change parameters used in the ajax URL of a DataTables table when using url.Action in ASP.NET MVC, you can utilize DataTables' API methods. Specifically, you can make use of the ajax.url() method to dynamically change the URL parameters and then call ajax.reload() to reload the table with the updated parameters.

Here's a basic example of how you can achieve this:

// Initialize your DataTable
var table = $('#example').DataTable({
    "ajax": {
        "url": '@Url.Action("YourAction", "YourController")',
        "type": "POST", // or "GET" based on your requirement
        "data": function(d) {
            // Additional data to be sent to the server
            d.customParam = $('#customParam').val(); // Example: Get the value from an input field
        }
    }
});

// Function to reload the DataTable with new parameters
function reloadTable() {
    // Change the URL parameter dynamically
    table.ajax.url('@Url.Action("YourAction", "YourController")' + '?customParam=' + $('#customParam').val()).load();
}

// Example event listener to trigger reload
$('#customParam').change(function() {
    reloadTable();
});

In this example:

$('#customParam').change() listens for changes in an input field with the id customParam.

When the input field changes, the reloadTable() function is called.

Inside reloadTable(), the DataTable's ajax.url() method is used to dynamically update the URL with the new parameter value (customParam) obtained from the input field.

Finally, ajax.reload() is called to reload the table with the updated URL.

If you want to get url request to get data when selecting the DropDownList, you can use like this

var url = "Product/GetProductByCategoryId?categoryId=" + $('#ddlCategory option:selected').val();

Next, you can reload the table by call your jquery datatables.net

$('#table').DataTable().ajax.url(url).load();

Don't forget to replace "YourAction" and "YourController" with the appropriate action and controller names in your ASP.NET MVC application, and adjust the parameter names and values according to your specific requirements.