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.
The AntiForgery Token needs to be added and there needs to be a form element on the page.
in your Startup.Cs Add this before services.AddMvc()
services.AddAntiforgery(o => o.HeaderName = "XSRF-TOKEN");
thenn in your ajax, change to:
$.ajax({
type: "POST",
url: '/About', // <-- Where should this point?
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);
})
}
then in your method add
[ValidateAntiForgeryToken]
public IActionResult OnPost()
{
//throw new Exception("stop");
return new JsonResult ("Hello Response Back");
}
On the cshtml page wrap the button in a form or no AntiForgery cookie will be added.
<form method="post">
<input type="button" value="Ajax test" class="btn btn-default" onclick="ajaxTest();" />
</form>
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
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',
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',
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
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
来源：https://stackoverflow.com/questions/46410716/example-ajax-call-back-to-an-asp-net-core-razor-page