Running a C# function on an onclick to modify SVG file-CodePudding

I have an ASP.NET Core MVC application with a couple of coded in functions in the .cshtml pages(Razor). This one in particular I'd like to run when an a-tag gets clicked on. This code will essential will go to a locally stored .svg file and change some of the styling attributes. The code for that is below, and is stored in the View.

public static void turnRed()
{   
    var pathToSVG = "path/to/svg";
    var doc = XDocument.Load(pathToSVG);
    var node = doc.Descendants(XName.Get("rect", "http://www.w3.org/2000/svg")).FirstOrDefault(cd => cd.Attribute("id").Value == "rect1");

    node.SetAttributeValue("fill", "red");

    doc.Save(pathToSVG);


}

Now in the actual html I would like to have a simple onclick expression that would run the code when the a-tag gets pressed.

    <a onclick="@{ turnRed(); }" href="#">Change SVG color</a>

What I have right now for whatever reason gets called onl oad, and not on click. How might I go about this? If there's a way to to do it without JavaScript, that would be ideal, but whatever works. Thanks!

Here are some of the concepts I've looked at and tried already:

Using Razor to call C# function

https://www.c-sharpcorner.com/blogs/how-to-create-razor-function-in-asp-net-mvc-view1

https://asp.mvc-tutorial.com/razor/local-functions/

https://docs.microsoft.com/en-us/aspnet/core/mvc/views/razor?view=aspnetcore-6.0

CodePudding user response：

Razor page allows the use of handler methods. To call a method from your page you need to put On the http verb your method name. In my tests this didn't work with static methods

Change your signature method for:

public void OnGetTurnRed()

And change your 'a' for:

<a asp-page-handler="TurnRed">Change SVG color</a>

Docs Razor