7
votes

I've found examples of have multiple handlers on a page and the associated naming convention (ie OnPostXXX) and 'asp-post-hanlder' tag helper. But how can I call one of these methods from an AJAX call.

I have an older example with a typical MVC view and controller but how does this work with a Razor Page?

For example if I take the base application and modify the About.cshtml page to the following:

@page
@model AboutModel
@{
    ViewData["Title"] = "About";
}
<h2>@ViewData["Title"]</h2>
<h3>@Model.Message</h3>

    <input type="button" value="Ajax test" class="btn btn-default" onclick="ajaxTest();"  />

@section Scripts {
<script type="text/javascript">
    function ajaxTest() {
        console.log("Entered method");
        $.ajax({
            type: "POST",
            url: '/About', // <-- Where should this point?
            contentType: "application/json; charset=utf-8",
            dataType: "json",
        error: function (xhr, status, errorThrown) {
            var err = "Status: " + status + " " + errorThrown;
            console.log(err);
        }
        }).done(function (data) {
            console.log(data.result);
        })
    }
</script>
}

And on the model page About.cshtml.cs

public class AboutModel : PageModel
{
    public string Message { get; set; }

    public void OnGet()
    {
        Message = "Your application description page.";
    }

    public IActionResult OnPost() {
        //throw new Exception("stop");
        return new JsonResult("");
    }
}

The OnPost is not called from the Ajax call.

7
What do you want to do? Can you show your view?nbokmans
There isn't a 'View' just a Razor Page. I've expanded the example.Brad Patton
docs.microsoft.com/en-us/aspnet/core/mvc/razor-pages/… @page makes the file into an MVC action - which means that it handles requests directly, without going through a controller. ... The associations of URL paths to pages are determined by the page's location in the file system. The following table shows a Razor Page path and the matching URL: File name and path matching URL /Pages/Index.cshtml / or /Index /Pages/Contact.cshtml /Contact /Pages/Store/Contact.cshtml /Store/Contact /Pages/Store/Index.cshtml /Store or /Store/IndexGreg

7 Answers

18
votes

Razor Pages automatically generates and validates Antiforgery tokens to prevent CSRF attacks. Since you aren't sending any token within your AJAX callback, the request fails.

To solve this problem you will have to:

  1. Register the Antiforgery-Service
  2. Add the token to your request
  3. Add the antiforgery token to your page either by adding a <form> or by directly using the @Html.AntiForgeryToken HtmlHelper

1. Register the Antiforgery-Service in your Startup.cs

public void ConfigureServices(IServiceCollection services)
{
  services.AddRazorPages();
  services.AddAntiforgery(o => o.HeaderName = "XSRF-TOKEN");
}

2. Modify your AJAX callback

In the AJAX callback we add additional code to send the XSRF-TOKEN with our request header.

$.ajax({
    type: "POST",
    url: '/?handler=YOUR_CUSTOM_HANDLER', // Replace YOUR_CUSTOM_HANDLER with your handler.
    contentType: "application/json; charset=utf-8",

    beforeSend: function (xhr) {
      xhr.setRequestHeader("XSRF-TOKEN",
        $('input:hidden[name="__RequestVerificationToken"]').val());
    },

    dataType: "json"
}).done(function (data) {
  console.log(data.result);
})

3. Add the antiforgery token to your page

You can accomplish this by adding a <form>:

<form method="post">
    <input type="button" value="Ajax test" class="btn btn-default" onclick="ajaxTest();" />
</form>

or by using the @Html.AntiForgeryToken:

@Html.AntiForgeryToken()
<input type="button" value="Ajax test" class="btn btn-default" onclick="ajaxTest();" />

In both cases Razor Pages will automatically add a hidden input field which contains the antiforgery token once the page is loaded:

<input name="__RequestVerificationToken" type="hidden" value="THE_TOKEN_VALUE" />
1
votes

Please see this related section of the documentation https://docs.microsoft.com/en-us/aspnet/core/mvc/razor-pages/?tabs=visual-studio

The associations of URL paths to pages are determined by the page's location in the file system. The following table shows a Razor Page path and the matching URL

/Pages/Index.cshtml maps to / or /Index

/Pages/Contact.cshtml maps to /Contact

1
votes

Everything works well, but some changes have to be made:

1)Open Startup.cs:

public void ConfigureServices(IServiceCollection services)
        {
            services.AddAntiforgery(o => o.HeaderName = "XSRF-TOKEN");
            services.AddMvc();
        }

2)Open HomeController.cs:

[ValidateAntiForgeryToken]
        public IActionResult OnPost()
        {
            return new JsonResult("Hello Response Back");
        }

3)Open About.cshtml:

@{
    ViewData["Title"] = "About";
}
<h2>@ViewData["Title"]</h2>
<h3>@ViewData["Message"]</h3>

<p>Use this area to provide additional information.</p>
<form method="post">
    <input type="button" value="Ajax test" class="btn btn-default" onclick="ajaxTest();" />
</form>

<script src="~/lib/jquery/dist/jquery.js"></script>

<script type="text/javascript">
    function ajaxTest() {
        $.ajax({
            type: "POST",
            url: 'onPost',
            contentType: "application/json; charset=utf-8",
            beforeSend: function (xhr) {
                xhr.setRequestHeader("XSRF-TOKEN",
                    $('input:hidden[name="__RequestVerificationToken"]').val());
            },
            dataType: "json"
        }).done(function (data) {
            console.log(data.result);
        })
    }
</script>

It should be noted that "onPost" was added inside the controller, so in AJAX the correct "url" should be indicated. Then:

url: 'onPost',
1
votes

After looking at the answers above I got JSON ajax to work with .NET Core 2.1 Razor pages using Visual Studio 2017 Preview 2:

Startup.cs

services.AddAntiforgery(o => o.HeaderName = "XSRF-TOKEN");

PostJson.cshtml

@page
@model myProj.Pages.PostJsonModel
@{
    ViewData["Title"] = "PostJson";
}

<input type="button" value="Post Json" class="btn btn-default" onclick="postJson();" />

<script>
    function ajaxRazorPostJson(o) {
        return $.ajax({
            type: "POST",
            data: JSON.stringify(o),
            url: 'postJson',
            contentType: "application/json; charset=utf-8",
            beforeSend: function (xhr) { xhr.setRequestHeader("XSRF-TOKEN", $('input:hidden[name="__RequestVerificationToken"]').val()); },
            dataType: "json"
        });
    }

    function postJson() {
        ajaxRazorPostJson({ reqKey: "reqVal" }).done(data => alert(data));
    }
</script>

PostJson.cshtml.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.RazorPages;
using Newtonsoft.Json.Linq;    

namespace myProj.Pages
{
    public class PostJsonModel : PageModel
    {
        public IActionResult OnPost([FromBody] JObject jobject)
        {
            // request buffer in jobject
            return new ContentResult { Content = "{ \"resKey\": \"resVal\" }", ContentType = "application/json" };
            // or ie return new JsonResult(obj);
        }
    }
}

Browser

http://localhost:44322/postJson

0
votes

Accepted solution worked in local developing machine, but failed then deployed in Debian server behind Nginx reverse proxy (not found 404 error).

This is a working example with payload data:

<script type="text/javascript">
    $('#btnPost').on('click', function () {

        var payloadData; /*asign payload data here */

        $.post({              /* method name in code behind, and full path to my view*/
            url: '@Url.Action("OnPostAsync", "/Turtas/Inventorius/InventoriausValdymas")', 
            beforeSend: function (xhr) {
                xhr.setRequestHeader("XSRF-TOKEN",
                    $('input:hidden[name="__RequestVerificationToken"]').val());
            },
            data: JSON.stringify({ payloadData }),
            contentType: "application/json; charset=utf-8",
            dataType: "json"
        })
    })
</script>

VS 2017; .Net Core 2.2 Razor Pages; jQuery 3.3.1

0
votes

The following works with ASP.NET Core MVC 3.1 using the headers setting:

$.ajax({
    type: "POST",
    url: '/Controller/Action', 
    data: {
        id: 'value'
    },
    headers: {
        RequestVerificationToken:
            $('input:hidden[name="__RequestVerificationToken"]').val()
    },
    error: function (xhr, status, errorThrown) {
        var err = "Error: " + status + " " + errorThrown;
        console.log(err);
    }
}).done(function (data) {
    console.log(data.result);
});

Including the ValidateAntiForgeryToken attribute on the controller method:

    [HttpPost]
    [ValidateAntiForgeryToken]
    public async Task<JsonResult> Action(string id)
    {
        var result = $"You sent '{id}'";
        return Json(new { id, result });
    }
-1
votes

The answer works for me. I would only add that if we have customized methods on the page like:

   public IActionResult OnPostFilter1()
    {
        return new JsonResult("Hello Response Back");
    }

Then we should specify the handler name in the url:

url: 'OnPost?handler=filter1',