Json results return as UNDEFINED ???[Answered] RSS

• • Reply
  afrika

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  1166 Posts

  Json results return as UNDEFINED ???

  Aug 27, 2020 01:38 PM|afrika|LINK

  Hi guys

  I am using Razor action results to post/receive Ajax updates, however its returning UNDEFINED

  Here is my code, does anyone know what is wrong here ?

  it does hit the breakpoint where I have the Json return page on the server, but the client page alert shows UNDEFINED

  <script>
      $(document).ready(function () {
  
  
        var  AddAntiForgeryToken = function (data) {
              data.__RequestVerificationToken = $('#__AjaxAntiForgeryForm input[name=__RequestVerificationToken]').val();
              return data;
          };
  
          var T  = $('#__AjaxAntiForgeryForm input[name=__RequestVerificationToken]').val();
  
          var tobesent = { Mobile: "mobile", Forgery : T}
          ehioze(tobesent);
  
          return;
  
  
          function ehioze(tobesent) {
  
              $.ajax({
                  type: "post",
                  dataType: "html",
                  url: $(this).attr("rel"),
                  data: AddAntiForgeryToken({ id: parseInt($(this).attr("title")) }),
                  success: function (message) {
  
                   
                   
                      console.log(JSON.stringify(message.t));
                      alert(JSON.stringify(message.t));
                      alert('The Fight goes on');
                  },
                  error: function (message) {
                         alert(message.t);
                 
                  }
              });
  
  
  
  
  
  /// and action results page
  
  
   public IActionResult OnPostAsync()
          {
              var message = new
              {
                  t = "1"
              };
  
              
              return new JsonResult(message);
          }
  
  
  

• • Reply
  mgebhard

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  Re: Json results return as UNDEFINED ???

  Aug 27, 2020 03:38 PM|mgebhard|LINK

  afrika

  Here is my code, does anyone know what is wrong here ?

  We're missing code but what I can see shows you are not following the rules.   Define a route handlers which allows you to call the post method using the URL.  Otherwise, you need to use a query string; ?handler=message. 

  Razor pages use a naming convention.  A post method starts with "OnPost" followed by the method name used in the AJAX function.

  The example below injects the antiforgery token.  Using the form tag helper does the same thing.

  @page "{handler?}"
  @model RazorDemo.Pages.ajax.JsonExModel
  @inject Microsoft.AspNetCore.Antiforgery.IAntiforgery antiforgery
  @{
      ViewData["Title"] = "Json Ex";
      var token = antiforgery.GetAndStoreTokens(HttpContext).RequestToken;
  }
  
  
  <div>
      <input id="Button1" type="button" value="button" />
  </div>
  <div id="result"></div>
  
  @section Scripts
  {
      <script>
          $('#Button1').click(function () {
  
              $.ajax({
                  type: "post",
                  url: "/ajax/JsonEx/Message",
                  contentType: "application/json; charset=utf-8",
                  dataType: "json",
                  headers: {
                      RequestVerificationToken: '@token'
                  },
                  success: function (response) {
                      console.log(response);
                      $('#result').text(response.t)
                  },
                  error: function (response) {
                      console.log(response);
                  }
              });
          });
  
      </script>
  }

  using System;
  using System.Collections.Generic;
  using System.Linq;
  using System.Reflection.Metadata.Ecma335;
  using System.Security.Policy;
  using System.Threading.Tasks;
  using Microsoft.AspNetCore.Mvc;
  using Microsoft.AspNetCore.Mvc.RazorPages;
  
  namespace RazorDemo.Pages.ajax
  {
      public class JsonExModel : PageModel
      {
         
          public void OnGet()
          {
          }
          
  
          public IActionResult OnPostMessage()
          {
              var message = new
              {
                  t = "1"
              };
  
              return new JsonResult(message);
          }
      }
  }
  

• • Reply
  afrika

  Member

  263 Points

  1166 Posts

  Re: Json results return as UNDEFINED ???

  Aug 27, 2020 05:30 PM|afrika|LINK

  thank you

  however its not hitting the break point, here is my code. Its for a shopping cart, built from scratch. Found at Pages >> Cart >> Index.cshtml

  @page "{handler?}"
  @model VirtualMarkets.Web.Pages.Cart.IndexModel
  
  
  @inject Microsoft.AspNetCore.Antiforgery.IAntiforgery antiforgery
  
  @{
      ViewData["Title"] = "Shopping basket";
      var token = antiforgery.GetAndStoreTokens(HttpContext).RequestToken;
  }
  
  @section scripts
      {
      @try
      {
  
          <script>
      $(document).ready(function () {
  
  
  
          $('#Button1').click(function () {
  
              $.ajax({
                  type: "post",
                  url: "/Cart/Index/Modifications",
                  contentType: "application/json; charset=utf-8",
                  dataType: "json",
                  headers: {
                      RequestVerificationToken: '@token'
                  },
                  success: function (response) {
                      console.log(response);
                      $('#result').text(response.t)
                  },
                  error: function (response) {
                      console.log(response);
                  }
              });
          });
  
   });
  

  and here is my handler

    public IActionResult OnPostAsyncModifications() 
          {
   
              var message = new
              {
                  t = "1"
              };
  
              
              return new JsonResult(message); 
          }

• • Reply
  mgebhard

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  Re: Json results return as UNDEFINED ???

  Aug 27, 2020 05:59 PM|mgebhard|LINK

  afrika

  however its not hitting the break point, here is my code. Its for a shopping cart, built from scratch. Found at Pages >> Cart >> Index.cshtml

  Remove the button click handler.   My example code used a button for testing.  Your design does not use a button...  Also change the AJAX URL so it matches your design.

• • Reply
  afrika

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  1166 Posts

  Re: Json results return as UNDEFINED ???

  Aug 27, 2020 09:20 PM|afrika|LINK

  This works, but one more question

  when I try to run it using Async it does not work ? 

  e.g. instead of using  OnPostMessage() I use  OnPostAsyncMessage() the latter does not work

• • Reply
  mgebhard

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  Re: Json results return as UNDEFINED ???

  Aug 28, 2020 01:28 AM|mgebhard|LINK

  afrika

  e.g. instead of using  OnPostMessage() I use  OnPostAsyncMessage() the latter does not work

  I assume you think adding "Async" to the end of "OnPost" makes the method async.  That's not the case.   The OnPost, OnGet, OnPut, naming convention apply to the Razor Pages framework and HTTP.  Asycn/await is a .NET language level programming pattern used across all platforms.  

• • Reply
  afrika

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  263 Points

  1166 Posts

  Re: Json results return as UNDEFINED ???

  Aug 31, 2020 09:39 PM|afrika|LINK

  thanks for the explanation