Web Forms :: Update Client Page When An Event Occurs In The Server (Code Behind)?
Nov 18, 2010
I am new to asp.net, so this might be a basic question. But I am struggling on this for more time... I have loaded a COM object in Server script using code behind (C#) and that COM object will trigger events in some random interval. I need to update the client page whenever I receive an event from the COM object from server side (code behind).My question is, Is there a way to make the client page do postback from the code behind(C#)? ie., The client page needs to be updated whenever an event occurs in the server. Is that possible? The com event does not trigger a postback since it only occurs in the server and not in the client.
I want to run code at the server(sql update) on a client button click, but i dont want a postback (more specifically, page flicker or loss of scrolling position).
My ASP.NET form contains a collection of dynamically-created radiobuttons that are created and configured in the Page_Load event handler.
Normally, I process postback data in the Page_Load handler, using the condition:
if (IsPostBack)
However, since the controls that I need to access are created IN the Page_Load handler, the postback data from the previous rendering of the page is lost. To better illustrate the problem, here is an outline of the events as they occur:
1-Page_Load is invoked for the first time 2-An unknown number of radiobuttons are created dynamically 3-The radiobuttons are configured, based on information present on the server 4-The radiobuttons are added to the page's content 5-The user selects an option, and clicks the submit button 6-The Page_Load handler is invoked for the second time 7-The radio-buttons are added dynamically, exactly as before 8-The radio-button that the user checked is seemingly non-existant for processing
It seems like I need to be processing different parts of this in different event handlers. Is there an event that occurs after postback, but while the original radiobuttons are still accessible?
I have a button which has a click event but its not firing on the first click. I suspect its something to do with that i am in dropdown box control so when i click the Button the event for the dropdown box occurs (textChanged) but it forgets about the click event
Of course if i click it a second time it works.
Or if i click somewhere else first so that the event TextChange occurs and then click the Button the first time it executes..
Is this normal and what are more workarounds if any?
basically the TextChange event must fire but the button click event must fire as well.
All the events i am talking about are ASP.NET events.
here is some examples of the events i am using - both the button and dropdown
uxGetData is a button and uxToDate is a dropdown box
Is is possible to initiate a partial page update whenever a client makes an update (say inserrting a record) and this will update the panel of all clients who are actually viewing the page ie eliminate the use of a timer control to refresh the panel each second because am getting many problems when using timercontrol.
I have a user control with a datalist loaded on my web page and also a web form to add another entry to the datalist when the button to submit the new entry I need to reload the user contol to show the new entry
I have the following gridview inside an updatepanel that makes the bind from a datatable:
[Code]....
What I intend to do and I'm not getting is the following: When i edit a textbox in a row with a new value, like Desconto textbox, i want that when that textbox looses the focus, to refresh the gridview with new values that result from changes in the value of the textbox. It's a new bind as i know, the problem is how to find the correct way to trigger the textbox textchanged event, at the moment nothing is happening. I created the Desconto_TextChanged event but when compiling, i receive a compilation error:
Description: An error occurred during the compilation of a resource required to service this request. review the following specific error details and modify your source code appropriately.
Compiler Error Message: BC30456: 'Desconto_TextChanged' is not a member of 'ASP.index_aspx'.
My scenario is that when a user clicks a link to download a file, a large file will be downloaded. But many files are zipped and to become a requested large file, files are needed to be unzipped at the server side and download it. Meanwhile unzipping the files, I wanna show to the user how many percent of files have been unzipped.
So, I save the current condition of % into the session () and it has been updated accordingly and in the other page session is called using the iframe to be seem as they are in the same page. But the problem is that,
while updating the iframe with update pannel and timmer tick event doent work and only when unzipping process has done, it works.
If i've the button outside an update panel (basically i'm using RadAjaxPanel by Telerik) it is working fine. But when the button is inside an ajax panel, even if i click OK for deleting the records the server side code is not called.
using vb.net/asp.net 2005 and SQL Server 2005.I had similar issue yesterday: I created a unique index on a table to prevent duplicates when user tries to edit existing records in a gridview.This works fine and I am seeing the "cannot insert duplicate key row message...." however I need to catch the exception because I do not want to display the table and column names.I have this set up but its not catching the exception, the exception is displaying but not my version, does anyone know in what gridview event and how I can catch and customize this exception? what i have now (but not working ) is:
i have a webform which has got required field validators. when the user doesnt enter values and clicks submit button it should not cause postback. i have set CausesValidation="True" on the submit button.hen the user clicks submit button without entering values, validation occurs( red * marks are shown) but the postback also occurs.
i would like to update database which resides on web server from my database which is on my computer. One method is to upload the file and than make a connectionstring. But its not possible while I do so in every 10 secs.
Is there any method which can make the connection string from desktop to web server or any other way.
I have built a basic calendar event using DDay.iCal, when I click "Add to calendar" link I produce an event and then sends this to the client.Basically, my application works like this.
A User logs in. Selects a specific date. Books a specific timeslot Clicks the "Add to calendar" link
Sending the event is done by using Response.Write() which sends the following to the client:
The above works fins but it requires me to first book the event then manually and then click the "Add to calendar" link.I want to merge the steps 3 and 4. But when trying to do so the event booking gets saved to the database but the screen does not get refreshed.Is there a "simple" way to get around this?
I'm here again to share a problem that I'm fighting against for days. I'm developing an eCommerce Cart.
Within it, I have a repeater, inside of ITEMTEMPLATE I put one TextBox for product quantities and one Button, for update the quantity inserted on that textbox.
When the customer clicks over the Button, it fires a function that gets the content of the TextBox and do an update on my Database.
It works perfetly when it is done with the mouse click. But I need to fires the update function WHITHOUT the manually click event. When the customer just put the mouse out of the TextBox (onblur event), I want to fires that function.
I have a gridview that is using a SQLdataSource with an update statement and I am able to print out the update statement listed in the SQLDataSource by doing this:
[Code]....
but for some reason the record is not being updated so I want to know how do I print out the entire Update statement, including the value of the EmailAddressID to make certain that the update statement is being set correctly?
I can test the update statement above manually, taking the EmailAddressID for that record and then run the update statement manually using SQL Server Mgmt then it updates the record correctly so I know the update statement set in the SQLDataSource is ok. However I still want to print out the update statement that is supposed to be executed in the vb code, how to do this?
I see there is an event called "SqlDataSource1_Updating",
is it possible to print out the actual update statement there?
Just to be clear in the asp.net page I want to do something to print out the actual full update statement, ex:
<SQL> UPDATE [EmailTable] SET [EmailAddress] = @EmailAddress WHERE [EmailAddressID] = 22 </SQL>
i need to update client on any changes occurred on server.for that i found 2 approach.
1. using ajax which is also known as reverse ajax for this purpose. 2. using COMET.
but i don't know exact difference in both.
my site contains news content and i want that news to be automatically updates when new news is entered by my CMS application. i have got hundreds of concurrent users on my web application.
NOTE: i am using .net framework 2.0 but if its not possible in 2.0 then can also move to 3.5
I am having trouble with the Asp.net page life cycle. I am trying to create a custom menu using HtmlTextWriter with an asp.net LinkButton to fire a server event. I can not get the server event to fire and I get the 'object reference not set to instance of object' when I click my linkbutton. Here is some code.
protected string CreateModuleMenu() { var modules = ModuleManager.GetModulesByDeveloperId(Developer.DeveloperID); StringWriter sw = new StringWriter(); ClientScriptManager cs = Page.ClientScript;
i built this application my self. i allready implement this application in 3 office and there's nothing problem. but when i implement this in another office i got some problems with my application. i dont know why, but sometimes i've got error on my server computer. when i've got this error in my server, my client still connect to my server and they can use my application( i have 5 client). this error happen 5 or 6 times a day.
I want to display a circular progress indicator using jquery in asp.net when textbox textchange event occurs.when user enters some value in a textbox and textchange event occurs or when user loses the focus on that textbox,system checks values in databases.I want to give user a progress indicator type when query is in progress, how can i accomplish with jquery. i am pasting a little code here.
$("#Txturl").blur(function() { $.ajax({ type: "POST", url: "Default.aspx/Getvalue", data: "{}", contentType: "application/json; charset=utf-8", dataType: "json", async: true, success: function(msg) { ///to to do here? i ve no idea; } }); return false; });
