Using JavaScript to Invoke an MVC Action: A Comprehensive Guide

I am facing a challenge with my Kendo UI dropdownlist which has a select event managed by a JavaScript function.

The issue I'm encountering is how to trigger an action result from a controller that executes a LINQ query to populate a Kendo UI grid on the webpage. The only way I currently see to handle this event is through JavaScript, but I haven't been successful in figuring out how to call my controller's action result from the JavaScript function.

This is the code for the DropDownList:

@(Html.Kendo().DropDownList()
    .Name("Options")
    .DataTextField("Text")
    .DataValueField("Value")
        .BindTo(new List<SelectListItem>() {
        new SelectListItem() {
            Text = "Policies Not Archived",
            Value = "1"
        },
        new SelectListItem() {
            Text = "View All Policies",
            Value = "2"
        },
        new SelectListItem() {
            Text = "Filter Policies",
            Value = "3"   
        }
    })
    .Events(e => 
    {
        e.Select("select");
    })
)

Below is my JavaScript event handler which needs to invoke the action result:

function select(e) {

}

Depending on the selection, the ActionResult will look like this:

public ActionResult ViewAllPolicies()
{
    //mycode
}

Answer №1

Check out this informative blog post

var url = '@Url.Action("ViewAllPolicies","YourController")';
    $.ajax({ url: url, success: DataRetrieved, type: 'POST', dataType: 'json' });

In the controller:

public ActionResult ViewAllPolicies()
{
    //Should return json format
}

url – specifies the URL where the request is sent. For example, if you have a controller named "contacts" with an action called ListPartiesByNameStart(). This action method takes a parameter called nameStart (which is the first letter of a person or company). The "success" property refers to the JavaScript function that handles retrieved data. It is recommended to use named functions rather than anonymous ones to maintain code organization. The "type" property indicates whether the request is a GET or POST. Using POST is suggested as ASP.NET MVC does not allow GET requests in JSON format by default (instructions on enabling this will be provided later). The "dataType" property specifies the expected data format to be returned by the server. Setting it to "json" allows jQuery to construct a JavaScript object tree based on the JSON received from the server.

Answer №2

Instead of opting for a JSON response, an alternative approach is to return a PartialView and use the .done function to seamlessly insert the fragment into the desired element on the page. PartialView actions essentially provide a way to return a snippet of HTML, allowing you to place it anywhere within the layout:

$.ajax({
        url: urlToPartialViewAction,
        type: 'POST',
        dataType: 'JSON',
        data: '123'
    })
    .done(function (result) {
       $('#someDivPlaceholder').replaceWith(result);        
    });

For example, you could have a link or a greyed-out div that triggers this behavior upon clicking. The link may read "View Receipt," leading to an action that delivers a partial view of the receipt. Upon clicking, the div/link gets substituted with the actual receipt content. This setup resembles the functionality of "View More Comments" links commonly found on social media platforms.

It's important to note that a partial view cannot stand alone; it needs to be invoked through an action.

public PartialViewResult _GetReceipt(string id)
{
   ReceiptViewModel vm = //query for receipt data
   return PartialView(vm);//render partial view and return html fragment
}

Answer №3

After the select function is triggered, it's important to initiate an AJAX call back to your Controller. By utilizing jQuery.ajax() (which serves as a wrapper for common AJAX operations) within the select function,

function select(e) {
    var url = '@Url.Action("ViewAllPolicies", "PolicyController")';
    var selectedPolicy = $('#Options').val(); // The option selected

    $.ajax({
        url: url,
        type: 'POST',
        dataType: 'JSON',
        data: selectedPolicy
    })
    .done(function (data) {
        // Present the data received from your Controller
    });
}

You can refer to the Kendo site for further insights on how the DropDownList operates.

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