AJAX :: Asynchronous Calls To Same Method?
Mar 12, 2010
I am relatively new to asp.net. In My asp.net website, i have a method GetData(int id) which is called Repetitively, depending on id count, GetData is desinged to get data from sharepoint and sql server both. if the Id count is high say =10, my page load time increases because GetData is called 10 times and the page load time keeps adding up. so I want to ask, is there any way that this GetData() be called asynchornously or by the use of some thread, so that my page loads faster.
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Nov 22, 2010
We have a custom Ajax checkbox control. In that control we set value (from inside the control) via a web service call (say WSCall1) to the business engine. There is also an event exposed on the OnClick of checkbox for the end user to have their custom code where the end user have their own web service call (say WSCall2). This event that end users will write is handled inside the ajax checkbox control on the "OnSuccess" of the internal web service call (i.e WSCall1) with an expectation that if WSCall1 succeeds, WSCall2 will get executed. This works fine with Firefox and Chrome but not in IE. In IE sometimes WSCall2 gets executed first and then WSCall1 -- actually there is no gurantee which web service gets called first. For WSCall1 we have used " Sys.Net.WebServiceProxy.invoke"
Is there a way we can make sure that WSCall2 gets only executed on the "OnSuccess" of WSCall1? Isn't the OnSuceess supposed to be executed when the WSCall1 thread returns?
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Jan 25, 2011
OK Here is the situation:
I have a web app with a table of statistics on our salesmen's customers, and each row has a sparkline graph showing the general trend of the sales data for the last 12 months. Each page shows a particular salesman's customer list, and some of them can have an enormous number of customers = an enormous number of rows = an enormous number of sparklines (e.g. one in particular has 125 and takes 15 seconds to load).
For this reason, jQuery sparklines could not be used - they completely pinned the CPU of a user accessing a page with a lot of sparklines with IE.
So I moved on to using the Google Chart API, which worked much better, except for two issues: 1) it's on a secure site, and the Google Chart API URL is only served over HTTP (solved by using a small wrapper script to download the graph dynamically and re-serve it from our secure server); and 2) on a page with 125 sparklines, it was still very slow due to the number of requests (even when the 0-9 server prefixes are used to maximize the # of available connections).
So my next step beyond this was to try to make each of the "download/grab/re-serve image" method calls asynchronous - and it worked!
...but only on my dev box running in debug mode.
When I pushed it up to the live site, it was faster, but it left some of the images unloaded, which is of course unacceptable.
So here is what I was hoping some SO hotshot would know:
1) Why are my asynchronous method calls working while debugging, but not working on the live site?
2) Is there any easier way to get a large number of sparklines of some sort to load quickly on a secure server without making me want to tear my hair out?
2a.) Does anyone have any experience using the ASP.NET Chart Library? Is this something I should investigate?
2b.) A co-worker suggested I make my own sparkline routine using a 1x1 CSS background image and varying the height. The problems are a) it is completely un-extensible in case we want to make changes; b) it seems hacky as hell (leaves about a bajillion DIVs per sparkline in the markup); and c) I have no idea if it will be fast enough when there are 100-200 of them on one page - what are your thoughts on the feasibility of the 1x1 sprite approach?
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Sep 24, 2010
I have been moving my application to be more AJAX-based. Currently I have a web service call where I use jQuery to gather some textbox (string) and checkbox (boolean) results and pass it to a web service. Everything works really well, the response time is super quick. The only downside that I can see to this is
1) you need to use jQuery, which will add to the user's download time - this doesn't really affect my application too much because I am using jQuery throughout the site
2) users can see the code and potentially try to hack the web service because they know where it is
I am most concerned with #2. I've been reading a lot about .NET web service calls, using IAsyncResult,
http://msdn.microsoft.com/en-us/library/2e08f6yc.aspx, and I am beginning to understand the 4 methods available in this article. However, is there extra bloat using this way compared to the jQuery web service call?If there isn't that much bloat or lag time using this method, I'd like to convert my application. Which one of these 4 methods is best in a scenario where I am just returning a small string value? The 4 methods in the article are to wait for EndInvoke itself, which from what I read is not recommended because this may block the first thread; and this should not be used on a service that affects the UI.Create a WaitHandle to wait for the 'OK' before EndInvoke is called Poll the IAsyncResult for .IsCompleted, using sleep() and a Do While until IAsyncResult.IsCompleted is true, then call EndInvoke Pass a delegate function to BeginInvoke to be called once the operation is complete.
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Jan 7, 2011
I am currently developing a project management application using ASP.NET (VB). I am nearly done with it. But whenever users select an item from drop-down list control, a post back is triggered and screen is returned to the bagining. This is very irritating at times.
So, I want to know how can I make partial postbacks so that page is not refreshed again and appropriate binding of list control with my oracle database is also made.
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Jun 11, 2010
I have AutocompeteExtender control in my page.it calls web method (in webservice) that have no parameter I have two web methods in webservice Method 1Geist(string PreText, int Count){....}Method 2GetList(){.......}ethod 2 calls.I want to call method 1.
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Jan 7, 2011
I am currently developing a project management application using ASP.NET (VB). I am nearly done with it. But whenever users select an item from drop-down list control, a post back is triggered and screen is returned to the bagining. This is very irritating at times.
<p> So, I want to know how can I make partial postbacks so that page is not refreshed again and appropriate binding of list control with my oracle database is also made.
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Sep 2, 2010
i have the code for asynchronous call to the database. i execute the sql command into the begin method that will executed onto the separate thread. now i want to execute the another database call asynchronously so that this also execute onto the separate thread. code for one database cal is here....
private SqlConnection con, con1;
private SqlCommand cmd, cmd1;
private SqlDataReader dr, dr1;
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
AddOnPreRenderCompleteAsync(new BeginEventHandler(Begin),
new EndEventHandler(End)
);
}
}
/////////////BEGIN METHOD
IAsyncResult Begin(object sender, EventArgs e,AsyncCallback cb, object state)
{
string connect = "Data Source=.\SQLEXPRESS;Asynchronous Processing=true;AttachDbFilename=|DataDirectory|\Database.mdf;Integrated Security=True;User Instance=True";
con = new SqlConnection(connect);
con.Open();
cmd = new SqlCommand("SELECT FirstName,LastName,Age,Company,Profile FROM Person",con);
return cmd.BeginExecuteReader(cb, state);
}
//////END METHOD
void End(IAsyncResult ar)
{
dr = cmd.EndExecuteReader(ar);
Label2.Text = System.Threading.Thread.CurrentThread.GetHashCode().ToString();
GridView1.DataSource = dr;
GridView1.DataBind();
}
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Jul 27, 2010
I have jQuery plugin - progress bar. How to invoke server side method on success? The code is below:
(Everything works fine)
[Code]....
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Aug 7, 2010
any modal popup controls whereas I can interact with the controls, causing callbacks and asynchronous calls without losing the popup.
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Jul 20, 2010
I'm currently working on a web site which involves a data upload process. The file is currently uploaded to the server method is called (in app_code) where ultimately a DTS package is called (via a web method) to load the data into a database and perform some validation on it.The client has specified that they don't want to have to wait for the DTS package to execute (execution time is less than 5 minutes) so it appears that I need to call the method asynchronously. The user will probably logout or close the browser window while this task is running so I believe I'm unable to run this on an asp.net thread.
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Aug 30, 2010
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i have already read the blog onto the code project on to the link [URL]
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Jun 20, 2010
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<asp:ObjectDataSource ID="ObjectDataSource1" runat="server" DeleteMethod="DeletePayment"
InsertMethod="InsertPayment" SelectMethod="GetPayments" TypeName="CostsReportControl.Models.Payments"
UpdateMethod="UpdatePayment" OldValuesParameterFormatString="{0}_old">
<SelectParameters>
<asp:Parameter Direction="input" Type="string" Name="sortExpression" />
<asp:Parameter Direction="input" Type="string" Name="sortDirection" />
</SelectParameters>
<DeleteParameters>
<asp:Parameter Name="id" Type="Int32" />
</DeleteParameters>
</asp:ObjectDataSource>
<asp:ObjectDataSource ID="ObjectDataSource2" runat="server"
SelectMethod="GetList" TypeName="CostsReportControl.Models.PaymentTypes">
</asp:ObjectDataSource>
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{
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[code]...
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Jul 15, 2010
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This is my issue.
But my problem doesn't involve things that expire, so the idea of a timer isn't the best way to resolve it.
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Jun 11, 2010
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[Code].....
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SuitableApplicant sa = new SuitableApplicant();
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list = HS.Recruitment.RecruitmentService.GetSuitableAppls();
GridView1.DataSource = list;
[code]....
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Mar 18, 2010
For a web application developed on ASP.NET, we are finding that for user control files (ascx) we are returning long strings as a result of method calls. These are embedded in the ascx pages using the special tags <% %>When performing memory dump analysis for the application, we find that many of those strings are not being garbage collected. Also, the ascx pages are compiled to temporary DLLs and they are held in memory. Is this responsible for causing the long strings to remain in memory and not be garbage collected ?
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May 27, 2010
I have a gridview control with delete asp:ImageButton for each row of the grid. What I would like is for a jquery dialog to pop up when a user clicks the delete button to ask if they are sure they want to delete it.
So far I have the dialog coming up just fine, Ive got buttons on that dialog and I can make the buttons call server side methods but its getting the dialog to know the ID of the row that the user has selected and then passing that to the server side code. The button in the page row is currently just an 'a' tag with the id 'dialog_link'. The jquery on the page looks like this:
$("button").button();
$("#DeleteButton").click(function () {
$.ajax({
[code]...
The dialog itself is just a set of 'div' tags. Ive thought of lots of different ways of doing this (parameter passing, session variable etc...) but cant figure out how to get any of them working.Any ideas are most welcome
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Feb 17, 2010
I have the following Page_Load function...
protected void Page_Load(object sender, EventArgs e)
{
XmlDataSource1.Data = GetXmlFromFile(Request.QueryString["file"]);
XmlDataSource1.DataBind();
Repeater1.DataBind();
}
The page in which this Page_Load resides is called by a parent page. Each time this Page_Load gets called the value of "file" in the query string will be different. So each time I will be receiving the XML contents from a different file which are inserted into the XmlDataSource and then bound against by the Repeater. Getting the XML data from the file works great but when I bind against the repeater that only works the first time through Page_Load. Each time after that when this code is executed the same results from the first XML file are displayed in the repeater.
What am I missing here. How can I get the XML data to be bound against the repeater on each page load instead of just the first one?
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May 10, 2010
I have a webservice (ASP.NET) deployed on a webfarm. A client application consumes it on daily basis. The problem is that some of its calls are duplicated (with difference of milliseconds). For example I have a function Foo(string a,string b). The client app calls this webmethod as Foo('test1','test2') once but my log shows that it is being called twice or sometimes 3 or 4 times randomly. Is this anything wrong with the webfarm or the code? Note that the webmethod has simple straighfarward insert and update statements.
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Aug 13, 2010
I have view CreateStory and used the following code in VB.Net MVC 2
<% Using (Ajax.BeginForm("openInvite", "Action", New AjaxOptions With {.UpdateTargetId = "StoryInvite"}))%>
But it not calling "openInvite" method from "Action" controller
Instead it calling the "CreateStory" method from Action Controller when i click on Submit button.
<AcceptVerbs(HttpVerbs.Post)> _
Function CreateStory(<Bind(Exclude:="Id")> ByVal productToCreate As tblStory) As ActionResult
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Jan 15, 2010
Some people qualify their class variables with "this" when there is a potential resolution problem, which makes sense. But today I am looking at code that looks like well done code, and it has a "this" on the front of almost every line of code in the class. Since the code is complex and appears otherwise well done, I am wondering what is the purpose of this? Why have the private method calls start with "this" for example?
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Apr 16, 2010
Could ASP.NET AJAX UpdatePanel could be used in ASP.NET asynchronous pages ? Could Page Methods be made asynchronous also ?
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Nov 23, 2010
Since i am fresher to .net, i m unable to handle asp.net. I have call asynchronous ajax call using XMLHTTPRequest and also use QueryString to filter Employee details.
I have following files:
1. Default.aspx code
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="Task2._Default" %>
<%@ Register TagPrefix="uc1" TagName="SearchResult" Src="SearchResult.ascx" %>
[code]....
3. Ajax.aspx is empty in design
what should be the code in Default.aspx.cs when u take some text in textbox to search, OnClick of "ok" button there should'nt be any postback.
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