Refreshing Data Using AJAX In ASP Masterpage?
Jan 16, 2012
I have some processes that run as a background job, allowing a user to continue to use a page, when the jobs are finished (which can take a few minutes) i want to display a message to the user, the best place to display this would be the masterpage AFAIK (incase they move from page to page on the site) so i have defined a div in the masterpage file.
I am trying to find the best method for displaying the data, at the moment i have a method in the masterpage vb file which polls a database to see if the job(which involves complex logic and some db access) has completed, if it has, it shows a message in the div e.g. "Job 13132 has completed" - which works fine.
The problem is this is not dynamic, and i have to refresh the page to call the function that checks if the processes have finished, how can i use AJAX to deliver this content automatically every 5 seconds?
I have tried using an asp timer with a 5 second tick time but the entire page refreshes on the timer click event every 5 seconds.Protected Sub Timer1_Tick(Byval sender as Object, Byval e As EventArgs)
[Code]...
Is there a way to only refresh the div with the updated message, without a full refresh happening using this code? Or if this is not possible, is there any way to replicate the above function using jQuery and still be able to update the DIV text only if a job as finished?
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Jun 14, 2012
I have a Master Page with nested pages in ASP.NET. Fairly simply I want to databind some hyperlinks to a gridview for the master page. This however is throwing a null reference exception when I try to set the DataSource.
I tested the code on a separate page and it works as expected. When debugging I can see the Page_Load Sub hit twice, I don't know if this is the cause I have one nested page being loaded, this is a blank page at the moment
EXCEPTION
Object reference not set to an instance of an object.
MASTERPAGE CODE BEHIND
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
[Code]....
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Aug 14, 2010
I am working on a huge multiform project for my company, and one of the few issues I am having is that when I am on the Main Menu Form, then go into a specific form (i.e Sales Order, etc.), do updates, changes, or just view data then close the Sales Order Form, if I happen to go back into the Sales Order Form without closing the entire project, then the Sales Order Form will display data instead of opening a blank form like when I first opened it.
Is there something that I should be adding to the Form Close Event to dump all of the data or refresh the data adapters so that if I open the form again, it will display a blank form that is ready to be used like when I first opened it?
I have tried using;
Me.Dispose()
Me.Close()
when closing these subforms, but if I open them again, the data fields (combo boxes and text boxes) will have random data in them.
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Jun 12, 2011
I have two textboxes...on the textchanged event of one textbox, readonly property of other textbox gets defined...e.g. first textbox is retrieving data as add,update,delete...when the first textbox text is changed to update then & then only second textbox readonly property is set to false...Now the problem,I am facing is....whenevr first textbox text is add,delete,its working fine..& second textbox is fetching the correct data..but once first textbox data gets changed to update,second textbox data remain unchanged though its readonly property gets changed correctly..it shows the same data as it was showing the first time when first textbox was changed to update...but after that,its data is not changing.
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Jan 8, 2012
It uses a Drawmap() sub with map data to create the map on the game load, but I can't seem to get it to refresh, and then re-draw the map based on player location. For example, if the player walks into a door, then it refreshes the map to show them in a building. Any advice on this? Code below:
Imports System.Drawing
Imports System.Windows.Forms
Public Class Form1
[code].....
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Jun 24, 2011
I would like the client app being able to refresh the data every 30 minutes.
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Feb 23, 2012
This looks like an easy fix but I can't figure this out. I'm trying to have button click event on a subForm (NewTournament), add a record to a database, and then to notify a data grid which lists the records from the same database automatically (the grid is listed on HomeForm).I so for am able to update the database and call upon a new window. But I can't get it to refresh that datagrid for anything. I know I'm supposed to clear the datagrid, get changes, then refill the grid. But everytime I do this, the code is NOT updating. Furthermore, I can very well see that the record is being added.
Private Sub CreateTournament_Click(sender As System.Object, e As System.EventArgs) Handles CreateTournament.Click
' Check the form for errors, if none exist.
[code]......
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Oct 13, 2011
I'm facing a problem with a datagridview datasorce, or refreshing it. I'll try to explain what is happening. So I have a datagridview called dgvMaterials, I'm binding datasorce to the datagridview from one table in mySQL server. Here is the code:
Dim ds As New DataSet
Private Sub frmSettings_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
[code].....
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May 10, 2011
I have two dropdownlist, one is State and one is City. When a State is selected, the City dropdownlist becomes populated. At that point you can select a city, however if you select a city and go back and select a different state, the city dropdownlist is populated by the cities for both states. How do I get it clear the cities for the first state?
Here is the code behind
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
End Sub
[Code].....
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Mar 24, 2011
i had insert data to my database.and it run perfectly like i want.but when i refresh the server explorer all the data that i inserted using my form is lost when i debug it again.
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Mar 22, 2009
I'm currently coding an ATM system in VB, and when a user picks a card to 'log on' with, they have 3 attempts to log on before the card is confiscated. The card numbers are in a combobox (which are retreived from an SQL database using the DataAdapter), and each card has a boolean 'confiscated' field in the database.
[Code]...
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Apr 21, 2009
have a main form that displays a users score.I hide the main form when going to a child form.When that child form is closed, it will show the main form.The problem is that the datathat has been changed when going to the child form is not displayed on the main form since it has not been closed.Is there anyway around this?
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Mar 22, 2009
I'm currently coding an ATM system in VB, and when a user picks a card to 'log on' with, they have 3 attempts to log on before the card is confiscated.
The card numbers are in a combobox (which are retreived from an SQL database using the binding source which is linked to a data adapter), and each card has a boolean 'confiscated' field in the database.
It does actually set the card to confiscated after the 3 tries, however I'd like the form to 'refresh' so the card no longer appears in the combobox, without having to close down the form and reload it. Is there a way to do this? I've tried refreshing the combobox and data adapter (.Refresh) but this does nothing
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May 7, 2010
I load up a datatable - bind it to a binding source and a binding navigator - and lots of textboxes on the screen bound to that as well.When I get a concurrency violation - another user has already changed my vendor, let's say - what is the best method to go about refreshing the datatable with current data from the DB?
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Dec 29, 2009
[Code]...
The first time the page loads my structrure is filled correctly. After an AJAX postback all the structure fields are setting to nothing. (It seems that the Dim OldPInfo As New PInfo is called again), but i should better ask the SO Experts.
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Nov 10, 2011
I have a DataGridView on FormA and a DataGridView on FormB. The DataGridView on FormA is initially populated from a file. This same file is being reused when data is saved from either form.
What works: I show FormB by clicking a button (control) located on FormA and all of the data that is in FormA's DataGridView is read into the one on FormB from the file. I can make changes to the DataGridView on FormB and save back to the file but when I close FormB, the data on FormA remains the same as originally read in.
What is needed: If I make changes on FormB, what is the best way to refresh the DataGridView on FormA when I return to it? FormB is closed at this point. I tried to include a call (as the last statement) in the button control on FormA to read the data from the file again as this works initially but nothing happens.
Note: the FormA's DataGridView is also in a Tab control if this makes any difference to try and get it to refresh.
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Apr 14, 2011
I am creating a new page in VS2005 (VB) and it has a gridview, my problem is when I try to insert the grid into the ContentPlaceHolder (in design mode) it ends up somewhere else on the page all together.
ASPX code
<%@ Page Language="vb" MasterPageFile="~/secure/Master1.Master" CodeBehind="Master1.Master.vb" Inherits="Main.LiveCalendar" %>
<asp:Content ID="ContentPlaceHolder" ContentPlaceHolderID="ContentPlaceHolder1" runat="server">
<h1>Live Calendar</h1>
[code]....
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Oct 24, 2011
I've used IPostBackEventHandler on pages in the past for calling the RaisePostBackEvent in my code behind via javascript.I'm currently working on a project that requires the same functionality but would be pretty cool if I could put it in my MasterPage, I've tried similarly it identically but I'm having no luck, I wonder if someone could point me in the rite direction.[code]It's something I don't really want to do on each and every page that uses that MasterPage.
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Jun 8, 2011
I am posting this on behalf of a mate so repose from me might be delayed.
question:
Quote:
Never had to really touch a .NET website before and come accross a little problem and sifting through the massives of crap on google is proving tricky.
Got a masterpage file that contains this:
CODE:
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Apr 22, 2009
Server Error in '/' Application.Invalid postback or callback argument. Event validation is enabled using <pages enableEventValidation="true"/> in configuration or <%@ Page EnableEventValidation="true" %> in a page. For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them. If the data is valid and expected, use the ClientScriptManager.RegisterForEvent Validation method in order to register the postback or callback data for validation. Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.ArgumentException: Invalid postback or callback argument. Event validation is enabled using <pages enableEventValidation="true" /> in configuration or <%@ Page EnableEventValidation="true" %> in a page. For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them. If the data is valid and expected, use the ClientScriptManager.Register ForEventValidation method in order to register the postback or callback data for validation.
Source Error:
An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.
[code]...
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Sep 9, 2009
It seems like I can't set the id or name of the form in my masterpage. [it's always "aspnetForm"]
Is there a way to override the uniqueID property of form?
I tried to create a class and inherit from htmlform, but then i can't register it on my mastrepage, [unknown server tag ... ]
im registering it like this
<%@ Register TagPrefix="cf" Namespace="Framework.BaseForm" %>
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May 16, 2012
I have a problem that my jQuery don't load or something when i'm on the contentpages.When i click on the link that should load the jquery,it only works at my startpage (Default.aspx). And when i click at the same link that is placed in my footer on any other contentpage, nothing happens. So i guess something is wrong with the paths or the loading of my scripts.Here is my scripts in the masterpage .
<script type="text/javascript" src="../fancybox/jquery.fancybox-1.3.4.pack.js"</script>
<link href="../fancybox/jquery.fancybox-1.3.4.css" rel="stylesheet" type="text/css" />
<script type="text/javascript">[code]......
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May 30, 2012
For my masterpage, I embedded an image on HTML DIV. Background image did appear, but with 4 white border-like surrounding my image, where I didn't apply any.
<head runat="server">
<title>Untitled Page</title>
<asp:ContentPlaceHolder id="head" runat="server">
[Code].....
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Aug 30, 2011
I have a MasterPage,defaultPage and Cropper page and I am able to use JCrop when I have only default.aspx page and not master page and the cropper page.
Problem:When I have am having masterpage then I am unable to use the Jcrop as it is not showing the Image Cropper rectangle.
Here is my code:
Head part of Master Page:
CODE:
Body Part of MasterPage:
CODE:
Here is my Cropper.aspx code:
CODE:
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Jan 8, 2009
I have a webpage that is used to modify information in a database. The information is properly pulled from the database and properly displayed in their appropriate text boxes. The problem arises when i change the information and try to resubmit it to be saved. Unfortunately it never takes my edited information and reverts back to the original value that was loaded when the page was loaded.
All of the code has been tested out side of the masterpage and it is working properly so i am under the impression that it has something to do with the use of the masterpage. If my understanding is correct i cannot just do something like me.txtName.text to address an object in the content pages. So here is a snippet of the code and the portion that i am assuming has a problem.
[Code]...
The code shows the two methods that i have used to try and use findcontrol to access the text boxes. Both methods seem to locate the textboxes but once I pass the values to linksUpd it reverts back to the value that was originally loaded into the page and discards all of my changes.
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Feb 2, 2010
I have masterpage.master.vb where I have properties, such as;
Private _SQLerror As String
Public Property SQLerror() As String
Get
[Code]....
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Nov 15, 2011
I'm developing an application which requires log in. I'm using Master Pages and a customer Web Control which is my main menu system. The main menu accesses database information to provide notifications and various things, none of which will work unless the user is logged in. I am trying to place the following code:
If Session("hgAdminUser") = "" And InStr(Request.ServerVariables("url"), "/Login.aspx") <= 0 Then _
Response.Redirect("Login.aspx") ' if userSession is empty, redirect to login page.
Into the top of my MasterPage code behind, but it's still trying to process scripts, the main problem being that it is running the .ascs file which requires Database access, which it can't do without the required parameters from Login. I've tried running it within a Page_PreInit sub, also Page_Load and Page_Init, but in all cases it ignores this (or probably doesn't ignore it, but errors come in before it deals with this) and returns a big fat ERROR due to functions that I don't even want it to be running!! How can I check for a session variable, which if not present cause all other scripts on the page to be ignored and redirect? This is all using VB.NET
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Sep 15, 2009
I have written methods to override the LoadPageStateFromPersistenceMedium and SavePageStateToPersistenceMedium methods. now the problem is that i am using a masterpage, so how do i maintain using my masterpage and still inherit from System.Web.UI.Page?
Bear in mind that the .vb Code behind the masterpage already inherits System.Web.UI.MasterPage. Anybody know how i can "properly" override these methods in a MasterPage?
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Mar 16, 2011
I'm using Lightbox but i only want the references to the stylesheet and javascript files to be in the masterpage header on one page on the site (the page that uses lightbox). how do I programmatically add references to the stylesheet and javascript files in the page load?
the stylesheet is the 'css' folder and the three javascript files are a 'js' folder
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Apr 7, 2011
I have more than 100pages in my project & a single master page for all this. My masterpage has links to different pages. I want to change only the ContentPages( Child Pages) & my masterpage should not get reloaded.[code]...
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