Any way to make a synchronous call to PageMethods?

Question

I am trying to do this:

function DelBatch()
{var userInfo = get_cookie("UserInfo");
PageMethods.DeleteBatchJSWM(userInfo, function(result)
                                          {window.location = "BatchOperations.aspx";});
}

But it still works asynchronously. I need the browser to really wait for the completion of my code-code, then it can be updated

There is a list loaded with values ​​that were simply deleted from the database, they should not be visible. The problem is that the location of the window is updated before the code-code is executed, and it doesn’t look like it was deleted by the user.

Answer 1

jQuery ajax? (async), / : http://api.jquery.com/jQuery.ajax/

, PageMethods jQuery: http://encosia.com/using-jquery-to-directly-call-aspnet-ajax-page-methods/

, , , :

$.ajax({
  type: "POST",
  async: false,
  url: "yourpage.aspx/DeleteBatchJSWM",
  data: "{ put json representation of userInfo here }",
  contentType: "application/json; charset=utf-8",
  dataType: "json",
  success: function(msg) {
    window.location = "BatchOperations.aspx";
  }
});

Crockford JSON stringify json.

Answer 2

jQuery, PageMethod, javascript setInterval. , , jQuery, , . , - . , , , :

function DelBatch()
{

        var userInfo = get_cookie("UserInfo");
        PageMethods.DeleteBatchJSWM(userInfo, function(result) {window.location = "BatchOperations.aspx";});

        var status;

    //Check to see if it has completed every second
        var myInterval = setInterval(function ()
        {
            PageMethods.CheckDeleteBatchStatus(OnSuccess);
                if (status == "Finished")
                {
                    clearInterval(myInterval);
                        //Finished Deleting. Call your window refresh here
                WindowRefresh(); 
                }
        }, 1000);


        function OnSuccess(result)
        {
            status = result;
        }
}

:

[WebMethod]
public static string CheckDeleteBatchStatus()
{
    string status = GetDeleteBatchStatus(); //some function to get the status of your operation
    return status;
}

Answer 3

jQuery 2009 .

( ) WebRequestExecutor, (2007-07-04), (2007-10-30). , ASP.NET AJAX Sys.Net.XMLHttpExecutor Sys.Net.XMLHttpSyncExecutor xmlHttpRequest.open false .

, WebRequestManager :

Sys.Net.WebRequestManager.set_defaultExecutorType('Sys.Net.XMLHttpSyncExecutor');

:

Sys.Net.WebRequestManager.add_invokingRequest(function(sender, args) {
 if (iFeelLikeRunningThisRequestSynchronously) {
  args.get_webRequest().set_executor(new Sys.Net.XMLHttpSyncExecutor());
}});

.

Answer 4

I came across this site:

http://abhijit-j-shetty.blogspot.com/2011/04/aspnet-ajax-calling-pagemethods.html

which had a great way to handle synchronous PageMethod calls.

The javascript code is as follows:

// Make sure page methods operate synchronously
XMLHttpRequest.prototype.original_open = XMLHttpRequest.prototype.open;
    XMLHttpRequest.prototype.open = function (method, url, async, user, password) {

    async = false;

    var eventArgs = Array.prototype.slice.call(arguments);

    var q = 0;
    return this.original_open.apply(this, eventArgs);
}

// Make a generic WebMethod caller:
function WebMethodCall(FunctionName, callingobj) {
    var OnSuccess = function (result, userContext, methodName) {
        callingobj.push(result);
    }

    var OnFailure = function (error, userContext, methodName) {
        callingobj.push(error.get_message());
    }

    PageMethods[FunctionName](OnSuccess, OnFailure);

}

// OK, this is kludgy, but here goes. In order to have a synchronous PageMethod call
// we need an object that persists in the namespace to stuff the result value into (like an array)
// Essentially I'm emulating a ByRef call.

// ThisResult is an empty list. The WebMethodCall function sticks a value into that list.
// The code that makes the PageMethods get called synchronously is in Common.js

// Use the functions
var ThisResult = []; // This must be of a type which persists in the namespace
WebMethodCall('HelloWorld', ThisResult);
return ThisResult[0];