How to call a method present in the viewmodel from the view in ASP.NET core MVC

Question

0.00/5 (No votes)

See more:

Im just learning to get acquainted to .net core. Right now trying out a small application in asp.net core, MVC ver. 3.1.3.

From the Maincontroller's action method, the view is called :

public ViewResult mainMenu()
{
    MenuInfoModel menuInfoModel = new MenuInfoModel(); 
        return View("smnu",menuInfoModel);
}

The ViewModel for the View is :

public class MenuInfoModel
    {   
        public String getLicensedName()
        {
            return "Natasha Park";
        }
    }

The view(smnu.cshtml) content :

@model  LS.Models.ViewModels.MenuInfoModel    
@{
    ViewBag.Title = "LS - System";
}
<div Id="license">Licensed To : </div>
@section Scripts
{
    <script>
        $('#license').text("Licensed To : " + @Model.getLicensedName());
    </script>
}

The _Layout file is :

<!DOCTYPE html>

<html lang="en">
<head>
    <meta name="viewport" content="width=device-width" initial-scale=1 charset="utf-8" />
    <link href="~/lib/twitter-bootstrap/css/bootstrap.css" rel="stylesheet" />
    <script src="~/lib/jquery/jquery.js"></script>
    <script src="~/lib/twitter-bootstrap/js/bootstrap.js"></script>
    <title>@ViewBag.Title</title>
</head>
<body>
    <div>
        @RenderBody()
    </div>
</body>
@if (IsSectionDefined("Scripts"))
{
    @RenderSection("Scripts", required: true)
}
</html>

In the _ViewStart i have assigned the layout file to "Layout"

My Issue is :

The text for License is not changing. There are no errors. If i change the text directly in the script.. it happens but not through the return value from the ViewModel. How to make this change to take effect.

Please help.

Thanks in advance.

What I have tried:

Tried to attach a string in the script straight away it works.

Posted 1-May-20 19:31pm

Priya-Kiko

Updated 21-May-20 7:06am

Add a Solution

Comments

#realJSOP 4-May-20 8:24am

put a breakpoint in your viewmodel method to see if it's even getting there.

2 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Richard Deeming · Answer 1 · 2020-05-21T07:07:00

Quote:
There are no errors.

I'd be amazed if that was the case!

Check your browser's developer console, and you'll see that you have a syntax error in the rendered Javascript:

JavaScript

$('#license').text("Licensed To : " + Natasha Park);

You have an unquoted string literal, which is not valid Javascript.

If you want to emit a string variable from the server into your Javascript, you need to encode it properly. Fortunately, that's quite easy to do in ASP.NET Core:

Razor

@section Scripts
{
    <script>
        $('#license').text("Licensed To : " + @Json.Serialize(Model.getLicensedName()));
    </script>
}

This should output:

JavaScript

$('#license').text("Licensed To : " + "Natasha Park");

which shouldn't produce any client-side errors.

But, as solution 1 said, you don't need to use Javascript to output server-site values in your markup. Just output the value directly where you want it to appear:

Razor

<div id="license">Licensed To : @Model.getLicensedName()</div>

ASP.NET will ensure that the value is properly HTML-encoded, so you won't get any nasty surprises if the returned value contains "special" characters.

Also, as solution 1 mentioned, in .NET it's preferable to use properties instead of Java's getter and setter methods.
Properties - C# Programming Guide | Microsoft Docs[^]

Member 9853265 · Answer 2 · 2020-05-20T11:05:00

You are trying to use a method to show the licence name and not a property. Try:

public class MenuInfoModel
{
public string LicensedName { get; set; }
}

with:

public ViewResult mainMenu()
{
MenuInfoModel menuInfoModel = new MenuInfoModel();
menuInfoModel.LicenceName = "Natasha Park";
return View("smnu",menuInfoModel);
}

and change your view to:

@model LS.Models.ViewModels.MenuInfoModel
@{
ViewBag.Title = "LS - System";
}
<div>Licensed To : @Model.LicenceName</div>

MVC will replace @Model.LicenceName with the name held in the model. There is no need to use JQuery! You could also use:

<div>
<label>Licenced To : </label>
@Html.Display("LicenceName")
</div>

How to call a method present in the viewmodel from the view in ASP.NET core MVC

2 solutions

Solution 2

Solution 1

Add your solution here

Preview 0